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<document id="BE3360358958C900A1B279334879304C" ID-CLB-Dataset="2884" ID-DOI="10.5852/ejt.2021.783.1601" ID-GBIF-Dataset="aa9de9bf-dea4-4321-a51d-6c4f1f55032d" ID-ISSN="2118-9773" ID-Zenodo-Dep="5793422" ID-ZooBank="071EAD63-05ED-4D6C-AC45-8719E6D79E0B" IM.materialsCitations_approvedBy="felipe" IM.metadata_approvedBy="felipe" IM.tables_requiresApprovalFor="existingObjects,plazi" IM.taxonomicNames_approvedBy="felipe" checkinTime="1640009482758" checkinUser="felipe" docAuthor="Kröger, Björn &amp; Pohle, Alexander" docDate="2021" docId="5F4487ACFF95FF95FDED7B0CFBC47FB7" docLanguage="en" docName="ejt-783_1-102.pdf" docOrigin="European Journal of Taxonomy 783 (1)" docSource="http://dx.doi.org/10.5852/ejt.2021.783.1601" docStyle="DocumentStyle:EF2B578F1D15862ADE45B0C07C620911.14:EJT.2018-.journal_article.type1" docStyleId="EF2B578F1D15862ADE45B0C07C620911" docStyleName="EJT.2018-.journal_article.type1" docStyleVersion="14" docTitle="Eosomichelinoceras borealis Kröger &amp; Pohle 2021, sp. nov." docType="treatment" docUuid="C53AC527-FC9D-4433-A853-5BF9AE4C2B6C" docUuidSource="ZooBank" docVersion="10" lastPageNumber="60" masterDocId="A37DFFD4FFACFFAEFFD67F14FFDE7A64" masterDocTitle="Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities" masterLastPageNumber="102" masterPageNumber="1" pageNumber="58" updateTime="1701997144043" updateUser="plazi" zenodo-license-document="CC-BY-4.0" zenodo-license-figures="CC-BY-4.0" zenodo-license-treatments="UNSPECIFIED">
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<mods:title id="1A5B50CA4822FC0398F48DFDD7AC59F3">Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities</mods:title>
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<mods:namePart id="A4CAF7C05C051441C02BF3068D5078D3">Kröger, Björn</mods:namePart>
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<mods:namePart id="F721BEEACC0D6550C3D0793AAF98F12F">Pohle, Alexander</mods:namePart>
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<mods:affiliation id="B92CB868F2D91F5AE37E9747A56A0C8B">Paläontologisches Institut und Museum, University of Zurich, Zurich, Switzerland.</mods:affiliation>
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<mods:title id="E2D15AD473C6FE334AC2C1180C4C8041">European Journal of Taxonomy</mods:title>
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<mods:date id="1778FE0BB2908310B090DB5F7315B7CB">2021</mods:date>
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<paragraph id="D75236BAFF95FF97FDED7B0CFC277E57" blockId="57.[359,1228,1048,1145]" box="[571,1017,1048,1075]" pageId="57" pageNumber="58">
<heading id="8C1A81D6FF95FF97FDED7B0CFC277E57" box="[571,1017,1048,1075]" centered="true" fontSize="11" level="2" pageId="57" pageNumber="58" reason="2">
<taxonomicName id="10ED4D39FF95FF97FDED7B0CFC497E57" authority="Kröger &amp; Pohle, 2021" authorityName="Kröger &amp; Pohle" authorityYear="2021" box="[571,919,1048,1075]" class="Cephalopoda" family="Baltoceratidae" genus="Eosomichelinoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Orthocerida" pageId="57" pageNumber="58" phylum="Mollusca" rank="species" species="borealis" status="sp. nov.">
<emphasis id="E599EAA8FF95FF97FDED7B0CFC497E57" bold="true" box="[571,919,1048,1075]" italics="true" pageId="57" pageNumber="58">Eosomichelinoceras borealis</emphasis>
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<taxonomicNameLabel id="FEAA57D3FF95FF97FC487B0DFC277E57" box="[926,1017,1049,1075]" pageId="57" pageNumber="58" rank="species">sp. nov.</taxonomicNameLabel>
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<paragraph id="D75236BAFF95FF97FDF17B4AFBD27E1D" blockId="57.[359,1228,1048,1145]" box="[551,1036,1118,1145]" pageId="57" pageNumber="58">
<figureCitation id="4FD62A3FFF95FF97FDF17B4AFD067E1D" box="[551,728,1118,1145]" captionStart="Fig" captionStartId="22.[189,232,1536,1562]" captionTargetId="figure-11@21.[189,1398,272,2011]" captionTargetPageId="21" captionText="Fig. 12 (previous page). Apical parts of orthoconic cephalopods from the Olenidsletta Member, Floian, Ordovician, near Hinlopenstretet, Ny Friesland, Spitsbergen. A. Cyptendoceras sp. B., FMNH-P30472 from Profilbekken river basin, locality PR-phosphatic. Lateral view with siphuncle toward the left. B. Svalbardoceras sterna gen. et sp. nov, FMNH-P30169, from PO 7.5. Lateral view with siphuncle toward left. C, F–G. Eosomichelinoceras borealis sp. nov. C. Specimen FMNH-P30171, from bed PO 123.3. Lateral view with prosiphuncular side toward the right. D. Bactroceras fluvii sp. nov., FMNH-P30168, from Profilbekken river basin, locality PR-phosphatic, showing the ventral side with ventral sutural lobe. E, H, J. Bactroceras boliviensis Aubrechtová, 2015 from bed PO 131. E. Specimen FMNH-P30165, nearly dorsal view, showing the transition of the extreme apical part toward the juvenile part of the conch. F. Specimen FMNH-P30182, lateral view with siphuncle toward the right. G. Specimen FMNH-P30184, lateral view with siphuncle toward the left. H. Specimen FMNH-P30183, apical view, showing the smooth apical surface of the protoconch. I. Ethanoceras solitudines gen. et sp. nov., FMNH-P30173, from bed PO 123.3, note the fine transverse striation. J. FMNH-P30160, showing details of fine transverse ornamentation. Scale bar = 2 mm for all figures." figureDoi="http://doi.org/10.5281/zenodo.5794307" httpUri="https://zenodo.org/record/5794307/files/figure.png" pageId="57" pageNumber="58">Figs 12C, F–G</figureCitation>
, 
<figureCitation id="4FD62A3FFF95FF97FD327B4BFCC97E1D" box="[740,791,1119,1145]" captionStart="Fig" captionStartId="23.[189,232,1812,1838]" captionTargetBox="[201,1394,1216,1772]" captionTargetId="figure-239@23.[189,1398,1216,1772]" captionTargetPageId="23" captionText="Fig. 13. Details of the conch surface of transversally ornamented orthocones from the Olenidsletta Member, Floian, Ordovician, Profilstranda section, Ny Friesland, Spitsbergen. A. Ethanoceras solitudines gen. et sp. nov., FMNH-P30383, holotype, from bed PO 131. B. Eosomichelinoceras borealis sp. nov., FMNH-P30279, holotype, from bed PO 123.3. C. Bactroceras boliviensis Aubrechtová, 2015, FMNH-P30232, from bed PO 131, conch section with nearly cyclic spacing of transverse striae. Scale bar = 10 mm for all figures." figureDoi="http://doi.org/10.5281/zenodo.5793460" httpUri="https://zenodo.org/record/5793460/files/figure.png" pageId="57" pageNumber="58">13B</figureCitation>
, 
<figureCitation id="4FD62A3FFF95FF97FCF57B4BFC897E1D" box="[803,855,1119,1145]" captionStart="Fig" captionStartId="39.[191,234,1845,1871]" captionTargetBox="[195,1392,1361,1805]" captionTargetId="figure-432@39.[189,1398,1339,1807]" captionTargetPageId="39" captionText="Fig. 28.Reconstructionand interpretation of detailsof connecting ring and septal necks.A–B. Bactroceras boliviensisAubrechtová, 2015.A. Specimen FMNH-P30243, see Fig. 27D.B. Specimen FMNH-P30215, see Fig.29A.C. Eosomichelinoceras borealis sp. nov., from the Olenidsletta Member, Floian, Ordovician, Profilstranda section, Ny Friesland, Spitsbergen, specimen FMNH-P30305, see Fig. 33C. Black: septal neck and septum. Dark grey: connecting ring. Light grey: endosiphuncular deposits. Without scale." figureDoi="http://doi.org/10.5281/zenodo.5793508" httpUri="https://zenodo.org/record/5793508/files/figure.png" pageId="57" pageNumber="58">28C</figureCitation>
, 
<figureCitation id="4FD62A3FFF95FF97FCB57B4BFC697E1D" box="[867,951,1119,1145]" captionStart="Fig" captionStartId="48.[190,233,1852,1878]" captionTargetBox="[206,1390,738,1813]" captionTargetId="figure-156@48.[189,1398,738,1813]" captionTargetPageId="48" captionText="Fig. 33. Median sections of phragmocones. A–B. Hemichoanella occulta sp. nov., from bed PO 131. C–E. Eosomichelinoceras borealis sp. nov., from bed PO 123.3, Olenidsletta Member, Floian, Ordovician, Profilstranda section, Ny Friesland, Spitsbergen. A–B. Specimen FMNH-P30420, holotype. C. Specimen FMNH-P30305. D. Specimen FMNH-30288. E. Specimen FMNH-30284. Scale bars: A–B, E = 5 mm; C–D = 1 mm." figureDoi="http://doi.org/10.5281/zenodo.5793524" httpUri="https://zenodo.org/record/5793524/files/figure.png" pageId="57" pageNumber="58">33C–E</figureCitation>
, 
<figureCitation id="4FD62A3FFF95FF97FC157B4BFBD27E1D" box="[963,1036,1119,1145]" captionStart-0="Fig" captionStart-1="Fig" captionStartId-0="57.[189,232,1916,1942]" captionStartId-1="58.[189,232,1918,1944]" captionTargetBox-0="[204,1389,1558,1870]" captionTargetBox-1="[379,1147,1565,1872]" captionTargetId-0="figure-288@57.[189,1399,1538,1878]" captionTargetId-1="figure-340@58.[367,1161,1540,1880]" captionTargetPageId-0="57" captionTargetPageId-1="58" captionText-0="Fig. 39. Diagrams of spacing of ornamentation, angle of expansion, and relative chamber length of Eosomichelinoceras borealis gen. et sp. nov., from the Olenidsletta Member, Floian, Ordovician, Profilstranda section, Ny Friesland, Spitsbergen. See Supp. file 1 for details of measurements." captionText-1="Fig. 40. Diagrams of relative siphuncular diameter and relative siphuncular distance of Eosomichelinoceras borealis gen. et sp. nov. from the Olenidsletta Member, Floian, Ordovician, Profilstranda section, Ny Friesland, Spitsbergen. See Supp. file 1 for details of measurements." figureDoi-0="http://doi.org/10.5281/zenodo.5793544" figureDoi-1="http://doi.org/10.5281/zenodo.5793546" httpUri-0="https://zenodo.org/record/5793544/files/figure.png" httpUri-1="https://zenodo.org/record/5793546/files/figure.png" pageId="57" pageNumber="58">39–40</figureCitation>
</paragraph>
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<subSubSection id="9FF76531FF95FF97FF6B7BB4FD937FD8" pageId="57" pageNumber="58" type="diagnosis">
<paragraph id="D75236BAFF95FF97FF6B7BB4FEE87EDE" blockId="57.[189,310,1184,1210]" box="[189,310,1184,1210]" pageId="57" pageNumber="58">
<heading id="8C1A81D6FF95FF97FF6B7BB4FEE87EDE" bold="true" box="[189,310,1184,1210]" fontSize="11" level="3" pageId="57" pageNumber="58" reason="3">
<emphasis id="E599EAA8FF95FF97FF6B7BB4FEE87EDE" bold="true" box="[189,310,1184,1210]" pageId="57" pageNumber="58">Diagnosis</emphasis>
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<taxonomicName id="10ED4D39FF95FF97FF6B7BDAFE757E8C" authorityName="Chen" authorityYear="1974" box="[189,427,1230,1256]" class="Cephalopoda" family="Baltoceratidae" genus="Eosomichelinoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Orthocerida" pageId="57" pageNumber="58" phylum="Mollusca" rank="genus">
<emphasis id="E599EAA8FF95FF97FF6B7BDAFE757E8C" box="[189,427,1230,1256]" italics="true" pageId="57" pageNumber="58">Eosomichelinoceras</emphasis>
</taxonomicName>
with circular to slightly compressed conch cross section; conch in early growth stages slightly curved; shell surface ornamented with narrowly spaced transverse striae which form shallow hyponomic sinus at concave side of conch curvature; siphuncle eccentric, at convex side of conch curvature with rSP of 0.36, relative siphuncle diameter (rSD) ca 0.16 of corresponding conch cross section; septal necks loxochoanitic during earliest growth stages, orthochoanitic during later ontogeny; ca three chambers per length similar to corresponding conch cross section; connecting ring thin, tubular or slightly expanded.
</paragraph>
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<paragraph id="D75236BAFF95FF97FF6B7868FAD67DBA" blockId="57.[189,1398,1916,2014]" pageId="57" pageNumber="58">
<emphasis id="E599EAA8FF95FF97FF6B7868FEC07DF2" bold="true" box="[189,286,1916,1942]" pageId="57" pageNumber="58">Fig. 39.</emphasis>
Diagrams of spacing of ornamentation, angle of expansion, and relative chamber length of 
<taxonomicName id="10ED4D39FF95FF97FF6B78B4FDC67DDE" authority="Kröger &amp; Pohle, 2021" authorityName="Kröger &amp; Pohle" authorityYear="2021" box="[189,536,1952,1978]" class="Cephalopoda" family="Baltoceratidae" genus="Eosomichelinoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Orthocerida" pageId="57" pageNumber="58" phylum="Mollusca" rank="species" species="borealis" status="gen. et sp. nov.">
<emphasis id="E599EAA8FF95FF97FF6B78B4FDC67DDE" box="[189,536,1952,1978]" italics="true" pageId="57" pageNumber="58">Eosomichelinoceras borealis</emphasis>
</taxonomicName>
<taxonomicNameLabel id="FEAA57D3FF95FF97FDF078B4FD327DDE" box="[550,748,1952,1978]" pageId="57" pageNumber="58" rank="species">gen. et sp. nov.</taxonomicNameLabel>
, from the Olenidsletta Member, Floian, Ordovician, Profilstranda section, Ny Friesland, Spitsbergen. See Supp. file 1 for details of measurements.
</paragraph>
</caption>
<subSubSection id="9FF76531FF96FF94FF6B7E1DFD1A7B35" box="[189,708,265,340]" pageId="58" pageNumber="59" type="etymology">
<paragraph id="D75236BAFF96FF94FF6B7E1DFE9A7B47" blockId="58.[189,324,265,291]" box="[189,324,265,291]" pageId="58" pageNumber="59">
<heading id="8C1A81D6FF96FF94FF6B7E1DFE9A7B47" bold="true" box="[189,324,265,291]" fontSize="11" level="3" pageId="58" pageNumber="59" reason="3">
<emphasis id="E599EAA8FF96FF94FF6B7E1DFE9A7B47" bold="true" box="[189,324,265,291]" pageId="58" pageNumber="59">Etymology</emphasis>
</heading>
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<paragraph id="D75236BAFF96FF94FF6B7E2CFD1A7B35" blockId="58.[189,708,311,340]" box="[189,708,311,340]" pageId="58" pageNumber="59">From ancient Greek ‘Βορέας’, ‘north wind’.</paragraph>
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<subSubSection id="9FF76531FF96FF94FF6B7E6DFC127922" pageId="58" pageNumber="59" type="materials_examined">
<paragraph id="D75236BAFF96FF94FF6B7E6DFEB27BF6" blockId="58.[189,364,376,403]" box="[189,364,376,403]" pageId="58" pageNumber="59">
<heading id="8C1A81D6FF96FF94FF6B7E6DFEB27BF6" bold="true" box="[189,364,376,403]" fontSize="11" level="3" pageId="58" pageNumber="59" reason="3">
<emphasis id="E599EAA8FF96FF94FF6B7E6DFEB27BF6" bold="true" box="[189,364,376,403]" pageId="58" pageNumber="59">Type material</emphasis>
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<paragraph id="D75236BAFF96FF94FF3C7EB3FE267B80" blockId="58.[189,504,423,484]" pageId="58" pageNumber="59">
<materialsCitation id="67853CE7FF96FF94FF3C7EB3FE267B80" ID-GBIF-Occurrence="3421082314" collectionCode="FMNH-P" pageId="58" pageNumber="59" specimenCode="FMNH-P30279" specimenCount="1" typeStatus="holotype">
<emphasis id="E599EAA8FF96FF94FF3C7EB3FE827BA5" bold="true" box="[234,348,423,449]" pageId="58" pageNumber="59">
<typeStatus id="08568818FF96FF94FF3C7EB3FE827BA5" box="[234,348,423,449]" pageId="58" pageNumber="59" type="holotype">Holotype</typeStatus>
</emphasis>
<specimenCount id="C1EBFD33FF96FF94FF6B7EDEFEEF7B80" box="[189,305,458,484]" pageId="58" pageNumber="59" type="generic">Specimen</specimenCount>
<specimenCode id="874B9EC1FF96FF94FEEE7EDEFE2A7B80" box="[312,500,458,484]" collectionCode="FMNH-P" pageId="58" pageNumber="59">FMNH-P30279</specimenCode>
.
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</paragraph>
<paragraph id="D75236BAFF96FF94FF3C7D18FAE478D7" blockId="58.[189,1399,524,691]" pageId="58" pageNumber="59">
<materialsCitation id="67853CE7FF96FF94FF3C7D18FAE478D7" ID-GBIF-Occurrence="3421082326" collectionCode="P" location="from bed PO 131" pageId="58" pageNumber="59" specimenCode="FMNH-P30171, P30182, P30193, P30278, P30280, P30318, P30434, FMNH-P30170, FMNH-P30184, FMNH-P30182" specimenCount="4" typeStatus="paratype">
<emphasis id="E599EAA8FF96FF94FF3C7D18FEB97842" bold="true" box="[234,359,524,550]" pageId="58" pageNumber="59">
<typeStatus id="08568818FF96FF94FF3C7D18FEB97842" box="[234,359,524,550]" pageId="58" pageNumber="59" type="paratype">Paratypes</typeStatus>
</emphasis>
<specimenCount id="C1EBFD33FF96FF94FF6B7D3BFE1B782D" box="[189,453,559,585]" pageId="58" pageNumber="59">Fourty-one specimens</specimenCount>
(
<specimenCode id="874B9EC1FF96FF94FE0F7D3BFD49782D" box="[473,663,559,585]" pageId="58" pageNumber="59">FMNH-P30171</specimenCode>
, 
<specimenCode id="874B9EC1FF96FF94FD717D3BFCDD782D" box="[679,771,559,585]" pageId="58" pageNumber="59">P30182</specimenCode>
, 
<specimenCode id="874B9EC1FF96FF94FCC27D3BFCAE782D" box="[788,880,559,585]" pageId="58" pageNumber="59">P30193</specimenCode>
, 
<specimenCode id="874B9EC1FF96FF94FC577D3BFC03782D" box="[897,989,559,585]" pageId="58" pageNumber="59">P30278</specimenCode>
, 
<specimenCode id="874B9EC1FF96FF94FC387D3BFB96782D" box="[1006,1096,559,585]" pageId="58" pageNumber="59">P30280</specimenCode>
to 
<specimenCode id="874B9EC1FF96FF94FBA07D3BFB0D782D" box="[1142,1235,559,585]" pageId="58" pageNumber="59">P30318</specimenCode>
, 
<specimenCode id="874B9EC1FF96FF94FB357D3BFA9F782D" box="[1251,1345,559,585]" pageId="58" pageNumber="59">P30434</specimenCode>
; see Supp. file 1 for list of specimens) from type horizon and 
<specimenCount id="C1EBFD33FF96FF94FC5C7D47FBEE7808" box="[906,1072,594,621]" pageId="58" pageNumber="59" type="generic">one specimen</specimenCount>
from 
<locationDeviation id="C6E02F98FF96FF94FB577D46FDB378EB" pageId="58" pageNumber="59">
bed PO 
<quantity id="10159B5FFF96FF94FB3E7D46FAA97809" box="[1256,1399,594,621]" metricMagnitude="5" metricUnit="m" metricValue="1.3112799999999998" pageId="58" pageNumber="59" unit="m" value="131128.0">131, 128 m</quantity>
above base of Olenidsletta Member
</locationDeviation>
, all from type locality. Additionally, 
<specimenCount id="C1EBFD33FF96FF94FBE67D62FAA878EB" box="[1072,1398,629,656]" pageId="58" pageNumber="59">two microscopic fragments</specimenCount>
(
<specimenCode id="874B9EC1FF96FF94FF137D8DFE5C78D7" box="[197,386,665,691]" pageId="58" pageNumber="59">FMNH-P30170</specimenCode>
, 
<specimenCode id="874B9EC1FF96FF94FE587D8DFD9978D7" box="[398,583,665,691]" pageId="58" pageNumber="59">FMNH-P30184</specimenCode>
) from type horizon and 
<specimenCount id="C1EBFD33FF96FF94FCB27D8DFC5078D7" box="[868,910,665,691]" pageId="58" pageNumber="59">one</specimenCount>
(
<specimenCode id="874B9EC1FF96FF94FC4B7D8DFB8778D7" box="[925,1113,665,691]" pageId="58" pageNumber="59">FMNH-P30182</specimenCode>
) 
<location id="D2326061FF96FF94FBBE7D8CFAE878D7" LSID="urn:lsid:plazi:treatment:5F4487ACFF95FF95FDED7B0CFBC47FB7:D2326061FF96FF94FBBE7D8CFAE878D7" box="[1128,1334,664,691]" name="from bed PO 131" pageId="58" pageNumber="59">from bed PO 131</location>
.
</materialsCitation>
</paragraph>
<paragraph id="D75236BAFF96FF94FF6B7DCEFE257890" blockId="58.[189,507,730,756]" box="[189,507,730,756]" pageId="58" pageNumber="59">
<heading id="8C1A81D6FF96FF94FF6B7DCEFE257890" bold="true" box="[189,507,730,756]" fontSize="11" level="3" pageId="58" pageNumber="59" reason="3">
<emphasis id="E599EAA8FF96FF94FF6B7DCEFE257890" bold="true" box="[189,507,730,756]" pageId="58" pageNumber="59">Type locality and horizon</emphasis>
</heading>
</paragraph>
<paragraph id="D75236BAFF96FF94FF6B7C1DFC127922" blockId="58.[189,1398,776,838]" pageId="58" pageNumber="59">
From Profilstranda, adjacent to Hinlopenstretet, Spitsbergen, bed 
<collectionCode id="B1FCAE7FFF96FF94FC177C1DFC387947" box="[961,998,777,803]" country="Russia" name="Collection of the Zoological Institute of the Russian Academy of Sciences" pageId="58" pageNumber="59">PO</collectionCode>
123.3, 
<quantity id="10159B5FFF96FF94FB967C1DFB7F7947" box="[1088,1185,777,803]" metricMagnitude="2" metricUnit="m" metricValue="1.2029999999999998" pageId="58" pageNumber="59" unit="m" value="120.3">120.3 m</quantity>
above the base of the Olenidsletta Member, 
<collectionCode id="B1FCAE7FFF96FF94FE387C38FDDA7922" box="[494,516,812,838]" country="Canada" lsid="urn:lsid:biocol.org:col:13946" name="Royal British Columbia Museum - Herbarium" pageId="58" pageNumber="59" type="Museum">V</collectionCode>
2a trilobite zone, Blackhillsian, Floian.
</paragraph>
</subSubSection>
<subSubSection id="9FF76531FF96FF95FF6B7C79FBC47FB7" lastPageId="59" lastPageNumber="60" pageId="58" pageNumber="59" type="description">
<paragraph id="D75236BAFF96FF94FF6B7C79FE9079E3" blockId="58.[189,334,877,903]" box="[189,334,877,903]" pageId="58" pageNumber="59">
<heading id="8C1A81D6FF96FF94FF6B7C79FE9079E3" bold="true" box="[189,334,877,903]" fontSize="11" level="3" pageId="58" pageNumber="59" reason="3">
<emphasis id="E599EAA8FF96FF94FF6B7C79FE9079E3" bold="true" box="[189,334,877,903]" pageId="58" pageNumber="59">Description</emphasis>
</heading>
</paragraph>
<paragraph id="D75236BAFF96FF94FF6B7C8FFBDC7EED" blockId="58.[187,1399,923,1161]" pageId="58" pageNumber="59">
Conch with circular to slightly compressed cross section, exogastrically curved in juvenile growth stages, becoming nearly straight in growth stages with diameter&gt; 
<quantity id="10159B5FFF96FF94FC3C7CABFB9D79BD" box="[1002,1091,959,985]" metricMagnitude="-2" metricUnit="m" metricValue="1.0" pageId="58" pageNumber="59" unit="mm" value="10.0">10 mm</quantity>
. The 
<typeStatus id="08568818FF96FF94FB5A7CABFB2D79BD" box="[1164,1267,959,985]" pageId="58" pageNumber="59" type="holotype">holotype</typeStatus>
(specimen FMNH-P30279) is a fragment of a phragmocone which growths within a length of 
<quantity id="10159B5FFF96FF94FB417CF6FB347999" box="[1175,1258,994,1021]" metricMagnitude="-2" metricUnit="m" metricValue="5.3" pageId="58" pageNumber="59" unit="mm" value="53.0">53 mm</quantity>
from 
<quantity id="10159B5FFF96FF94FAE57CF6FED17E44" metricMagnitude="-3" metricUnit="m" metricValue="6.6" metricValueMax="10.0" metricValueMin="3.2" pageId="58" pageNumber="59" unit="mm" value="6.6" valueMax="10.0" valueMin="3.2">3.2 to 10 mm</quantity>
(angle of expansion ca 7°). The largest conch cross section diameter known is 
<quantity id="10159B5FFF96FF94FB427B11FB277E44" box="[1172,1273,1029,1056]" metricMagnitude="-2" metricUnit="m" metricValue="1.15" pageId="58" pageNumber="59" unit="mm" value="11.5">11.5 mm</quantity>
(specimen FMNH-P30297), which is a completely preserved, nearly straight body chamber with a length of 
<quantity id="10159B5FFF96FF94FAF57B3CFAAB7E27" box="[1315,1397,1064,1091]" metricMagnitude="-2" metricUnit="m" metricValue="2.8" pageId="58" pageNumber="59" unit="mm" value="28.0">28 mm</quantity>
and an angle of expansion of ca 5°. The low angle of expansion of this fragment indicates that a diameter of ca 
<quantity id="10159B5FFF96FF94FF2B7B7BFE8E7EED" box="[253,336,1135,1161]" metricMagnitude="-2" metricUnit="m" metricValue="1.2" pageId="58" pageNumber="59" unit="mm" value="12.0">12 mm</quantity>
is probably the adult size of this species (see also 
<figureCitation id="4FD62A3FFF96FF94FC487B7BFC2B7EED" box="[926,1013,1135,1161]" captionStart="Fig" captionStartId="57.[189,232,1916,1942]" captionTargetBox="[204,1389,1558,1870]" captionTargetId="figure-288@57.[189,1399,1538,1878]" captionTargetPageId="57" captionText="Fig. 39. Diagrams of spacing of ornamentation, angle of expansion, and relative chamber length of Eosomichelinoceras borealis gen. et sp. nov., from the Olenidsletta Member, Floian, Ordovician, Profilstranda section, Ny Friesland, Spitsbergen. See Supp. file 1 for details of measurements." figureDoi="http://doi.org/10.5281/zenodo.5793544" httpUri="https://zenodo.org/record/5793544/files/figure.png" pageId="58" pageNumber="59">Fig. 39</figureCitation>
).
</paragraph>
<paragraph id="D75236BAFF96FF94FF6B7BA4FC347F33" blockId="58.[188,1399,1200,1368]" pageId="58" pageNumber="59">
The ornamentation consists of fine striae, which run slightly obliquely transverse, which are deflected adorally on the convex side of the conch and form a shallow, but distinct hyponomic sinus at the concave side of the conch curvature (
<figureCitation id="4FD62A3FFF96FF94FDCE7BE3FD587F75" box="[536,646,1271,1297]" captionStart="Fig" captionStartId="23.[189,232,1812,1838]" captionTargetBox="[201,1394,1216,1772]" captionTargetId="figure-239@23.[189,1398,1216,1772]" captionTargetPageId="23" captionText="Fig. 13. Details of the conch surface of transversally ornamented orthocones from the Olenidsletta Member, Floian, Ordovician, Profilstranda section, Ny Friesland, Spitsbergen. A. Ethanoceras solitudines gen. et sp. nov., FMNH-P30383, holotype, from bed PO 131. B. Eosomichelinoceras borealis sp. nov., FMNH-P30279, holotype, from bed PO 123.3. C. Bactroceras boliviensis Aubrechtová, 2015, FMNH-P30232, from bed PO 131, conch section with nearly cyclic spacing of transverse striae. Scale bar = 10 mm for all figures." figureDoi="http://doi.org/10.5281/zenodo.5793460" httpUri="https://zenodo.org/record/5793460/files/figure.png" pageId="58" pageNumber="59">Fig. 13B</figureCitation>
). The 
<typeStatus id="08568818FF96FF94FD037BE3FCE27F75" box="[725,828,1271,1297]" pageId="58" pageNumber="59" type="holotype">holotype</typeStatus>
is ornamented with 7–10 transverse striae in a length of 
<quantity id="10159B5FFF96FF94FEFB7A0EFEAF7F50" box="[301,369,1306,1332]" metricMagnitude="-3" metricUnit="m" metricValue="1.0" pageId="58" pageNumber="59" unit="mm" value="1.0">1 mm</quantity>
where the conch is 
<quantity id="10159B5FFF96FF94FD8F7A0EFD437F50" box="[601,669,1306,1332]" metricMagnitude="-3" metricUnit="m" metricValue="9.0" pageId="58" pageNumber="59" unit="mm" value="9.0">9 mm</quantity>
in diameter. Six random measurements from the 
<typeStatus id="08568818FF96FF94FB087A0EFA9B7F50" box="[1246,1349,1306,1332]" pageId="58" pageNumber="59" type="holotype">holotype</typeStatus>
and other specimens result in a mean distance of 
<quantity id="10159B5FFF96FF94FD1D7A29FCED7F3C" box="[715,819,1341,1368]" metricMagnitude="-4" metricUnit="m" metricValue="1.1" pageId="58" pageNumber="59" unit="mm" value="0.11">0.11 mm</quantity>
between striae.
</paragraph>
<paragraph id="D75236BAFF96FF94FF6B7A6AFAA67FD8" blockId="58.[189,1400,1406,1468]" pageId="58" pageNumber="59">
The sutures are directly transverse with a mean relative chamber length of 0.28 of the corresponding cross section. The chamber length is 2.0– 
<quantity id="10159B5FFF96FF94FD727AB5FD227FD8" box="[676,764,1441,1468]" metricMagnitude="-3" metricUnit="m" metricValue="2.5" pageId="58" pageNumber="59" unit="mm" value="2.5">2.5 mm</quantity>
at 
<quantity id="10159B5FFF96FF94FCC97AB6FC5E7FD8" box="[799,896,1442,1468]" metricMagnitude="-3" metricUnit="m" metricValue="8.5" metricValueMax="9.0" metricValueMin="8.0" pageId="58" pageNumber="59" unit="mm" value="8.5" valueMax="9.0" valueMin="8.0">8–9 mm</quantity>
conch diameter in the 
<typeStatus id="08568818FF96FF94FB5D7AB6FB287FD8" box="[1163,1270,1442,1468]" pageId="58" pageNumber="59" type="holotype">holotype</typeStatus>
. The septal
</paragraph>
<caption id="83926632FF96FF94FF6B786AFBD77DBB" ID-DOI="http://doi.org/10.5281/zenodo.5793546" ID-Zenodo-Dep="5793546" httpUri="https://zenodo.org/record/5793546/files/figure.png" pageId="58" pageNumber="59" startId="58.[189,232,1918,1944]" targetBox="[379,1147,1565,1872]" targetPageId="58">
<paragraph id="D75236BAFF96FF94FF6B786AFBD77DBB" blockId="58.[189,1398,1918,2015]" pageId="58" pageNumber="59">
<emphasis id="E599EAA8FF96FF94FF6B786AFEC47DFC" bold="true" box="[189,282,1918,1944]" pageId="58" pageNumber="59">Fig. 40.</emphasis>
Diagrams of relative siphuncular diameter and relative siphuncular distance of 
<taxonomicName id="10ED4D39FF96FF94FB68786AFEBD7DD8" authority="Kröger &amp; Pohle, 2021" authorityName="Kröger &amp; Pohle" authorityYear="2021" class="Cephalopoda" family="Baltoceratidae" genus="Eosomichelinoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Orthocerida" pageId="58" pageNumber="59" phylum="Mollusca" rank="species" species="borealis" status="gen. et sp. nov.">
<emphasis id="E599EAA8FF96FF94FB68786AFEBD7DD8" italics="true" pageId="58" pageNumber="59">Eosomichelinoceras borealis</emphasis>
</taxonomicName>
<taxonomicNameLabel id="FEAA57D3FF96FF94FEBC78B6FDC47DD8" box="[362,538,1954,1980]" pageId="58" pageNumber="59" rank="species">gen. et sp. nov.</taxonomicNameLabel>
from the Olenidsletta Member, Floian, Ordovician, Profilstranda section, Ny Friesland, Spitsbergen. See Supp. file 1 for details of measurements.
</paragraph>
</caption>
<paragraph id="D75236BAFF97FF95FF6B7E1DFE827B23" blockId="59.[189,1398,264,327]" pageId="59" pageNumber="60">
perforation has a mean relative diameter of 
<quantity id="10159B5FFF97FF95FD167E1DFCCC7B47" box="[704,786,265,291]" metricMagnitude="-3" metricUnit="m" metricValue="4.064" pageId="59" pageNumber="60" unit="in" value="0.16">0.16 in</quantity>
all measured specimens (rSD 1 
<superScript id="20989BF2FF97FF95FB517E1DFB4C7B73" attach="none" box="[1159,1170,265,279]" fontSize="6" pageId="59" pageNumber="60">st</superScript>
–3 
<superScript id="20989BF2FF97FF95FB667E1CFB607B72" attach="left" box="[1200,1214,264,278]" fontSize="6" pageId="59" pageNumber="60">rd</superScript>
quantile: 0.13– 0.16; n = 26).
</paragraph>
<paragraph id="D75236BAFF97FF95FF6B7E7AFCAE7870" blockId="59.[189,1400,365,533]" pageId="59" pageNumber="60">
The siphuncle is eccentrically positioned, with rSP ≈ 0.36 on the convex side of the conch curvature (1 
<superScript id="20989BF2FF97FF95FF037E84FF3E7BFA" attach="none" box="[213,224,400,414]" fontSize="6" pageId="59" pageNumber="60">st</superScript>
–3 
<superScript id="20989BF2FF97FF95FF287E84FED27BFA" attach="left" box="[254,268,400,414]" fontSize="6" pageId="59" pageNumber="60">rd</superScript>
quantile: 0.32–0.38; n = 5) (
<figureCitation id="4FD62A3FFF97FF95FDA17E85FD0A7BCF" box="[631,724,401,427]" captionStart="Fig" captionStartId="58.[189,232,1918,1944]" captionTargetBox="[379,1147,1565,1872]" captionTargetId="figure-340@58.[367,1161,1540,1880]" captionTargetPageId="58" captionText="Fig. 40. Diagrams of relative siphuncular diameter and relative siphuncular distance of Eosomichelinoceras borealis gen. et sp. nov. from the Olenidsletta Member, Floian, Ordovician, Profilstranda section, Ny Friesland, Spitsbergen. See Supp. file 1 for details of measurements." figureDoi="http://doi.org/10.5281/zenodo.5793546" httpUri="https://zenodo.org/record/5793546/files/figure.png" pageId="59" pageNumber="60">Fig. 40</figureCitation>
). The septal necks are short loxochoanitic in specimen FMNH-P30193 at 
<quantity id="10159B5FFF97FF95FE4B7EA1FE3D7BAB" box="[413,483,437,463]" metricMagnitude="-3" metricUnit="m" metricValue="7.0" pageId="59" pageNumber="60" unit="mm" value="7.0">7 mm</quantity>
diameter conch diameter and orthocoanitic in larger fragments with a larger conch diameter (
<figureCitation id="4FD62A3FFF97FF95FE5B7EC3FDDC7B95" box="[397,514,471,497]" captionStart="Fig" captionStartId="39.[191,234,1845,1871]" captionTargetBox="[195,1392,1361,1805]" captionTargetId="figure-432@39.[189,1398,1339,1807]" captionTargetPageId="39" captionText="Fig. 28.Reconstructionand interpretation of detailsof connecting ring and septal necks.A–B. Bactroceras boliviensisAubrechtová, 2015.A. Specimen FMNH-P30243, see Fig. 27D.B. Specimen FMNH-P30215, see Fig.29A.C. Eosomichelinoceras borealis sp. nov., from the Olenidsletta Member, Floian, Ordovician, Profilstranda section, Ny Friesland, Spitsbergen, specimen FMNH-P30305, see Fig. 33C. Black: septal neck and septum. Dark grey: connecting ring. Light grey: endosiphuncular deposits. Without scale." figureDoi="http://doi.org/10.5281/zenodo.5793508" httpUri="https://zenodo.org/record/5793508/files/figure.png" pageId="59" pageNumber="60">Figs 28C</figureCitation>
, 
<figureCitation id="4FD62A3FFF97FF95FDC47EC3FDB77B95" box="[530,617,471,497]" captionStart="Fig" captionStartId="48.[190,233,1852,1878]" captionTargetBox="[206,1390,738,1813]" captionTargetId="figure-156@48.[189,1398,738,1813]" captionTargetPageId="48" captionText="Fig. 33. Median sections of phragmocones. A–B. Hemichoanella occulta sp. nov., from bed PO 131. C–E. Eosomichelinoceras borealis sp. nov., from bed PO 123.3, Olenidsletta Member, Floian, Ordovician, Profilstranda section, Ny Friesland, Spitsbergen. A–B. Specimen FMNH-P30420, holotype. C. Specimen FMNH-P30305. D. Specimen FMNH-30288. E. Specimen FMNH-30284. Scale bars: A–B, E = 5 mm; C–D = 1 mm." figureDoi="http://doi.org/10.5281/zenodo.5793524" httpUri="https://zenodo.org/record/5793524/files/figure.png" pageId="59" pageNumber="60">33C–E</figureCitation>
). The connecting ring is thin with tubular or slightly expanded segments. No endosiphuncular or cameral deposits known.
</paragraph>
<paragraph id="D75236BAFF97FF95FF6B7D28FCB579BD" blockId="59.[187,1401,572,985]" pageId="59" pageNumber="60">
The extreme apical part is preserved in specimens FMNH- P30171, FMNH-P30182, and FMNH-P30184 (
<figureCitation id="4FD62A3FFF97FF95FF127D4BFEAF781D" box="[196,369,607,633]" captionStart="Fig" captionStartId="22.[189,232,1536,1562]" captionTargetId="figure-11@21.[189,1398,272,2011]" captionTargetPageId="21" captionText="Fig. 12 (previous page). Apical parts of orthoconic cephalopods from the Olenidsletta Member, Floian, Ordovician, near Hinlopenstretet, Ny Friesland, Spitsbergen. A. Cyptendoceras sp. B., FMNH-P30472 from Profilbekken river basin, locality PR-phosphatic. Lateral view with siphuncle toward the left. B. Svalbardoceras sterna gen. et sp. nov, FMNH-P30169, from PO 7.5. Lateral view with siphuncle toward left. C, F–G. Eosomichelinoceras borealis sp. nov. C. Specimen FMNH-P30171, from bed PO 123.3. Lateral view with prosiphuncular side toward the right. D. Bactroceras fluvii sp. nov., FMNH-P30168, from Profilbekken river basin, locality PR-phosphatic, showing the ventral side with ventral sutural lobe. E, H, J. Bactroceras boliviensis Aubrechtová, 2015 from bed PO 131. E. Specimen FMNH-P30165, nearly dorsal view, showing the transition of the extreme apical part toward the juvenile part of the conch. F. Specimen FMNH-P30182, lateral view with siphuncle toward the right. G. Specimen FMNH-P30184, lateral view with siphuncle toward the left. H. Specimen FMNH-P30183, apical view, showing the smooth apical surface of the protoconch. I. Ethanoceras solitudines gen. et sp. nov., FMNH-P30173, from bed PO 123.3, note the fine transverse striation. J. FMNH-P30160, showing details of fine transverse ornamentation. Scale bar = 2 mm for all figures." figureDoi="http://doi.org/10.5281/zenodo.5794307" httpUri="https://zenodo.org/record/5794307/files/figure.png" pageId="59" pageNumber="60">Fig. 12C, F–G</figureCitation>
). The initial ca 
<quantity id="10159B5FFF97FF95FDF77D4BFDA7781E" box="[545,633,607,634]" metricMagnitude="-3" metricUnit="m" metricValue="1.5" pageId="59" pageNumber="60" unit="mm" value="1.5">1.5 mm</quantity>
in both specimens are set apart from the subsequent shell in being distinctly bent in growth direction toward the convex side of the curvature of the subsequent shell, which is the prosiphuncular side. The initial ca 
<quantity id="10159B5FFF97FF95FD757DB1FD2078A4" box="[675,766,677,704]" metricMagnitude="-3" metricUnit="m" metricValue="1.5" pageId="59" pageNumber="60" unit="mm" value="1.5">1.5 mm</quantity>
differs also in lacking the fine transverse striation of the subsequent conch parts. The protoconch has a very distinctive stump-like form with a diameter of 
<quantity id="10159B5FFF97FF95FF687DF8FED87962" box="[190,262,748,774]" metricMagnitude="-3" metricUnit="m" metricValue="1.0" pageId="59" pageNumber="60" unit="mm" value="1.0">1 mm</quantity>
(specimen FMNH-P30182) and 
<quantity id="10159B5FFF97FF95FD407DF8FD2A7962" box="[662,756,748,774]" metricMagnitude="-3" metricUnit="m" metricValue="1.4" pageId="59" pageNumber="60" unit="mm" value="1.4">1.4 mm</quantity>
(specimen FMNH-P30184), and a length of 
<quantity id="10159B5FFF97FF95FACD7DF8FAA67962" box="[1307,1400,748,774]" metricMagnitude="-4" metricUnit="m" metricValue="9.0" pageId="59" pageNumber="60" unit="mm" value="0.9">0.9 mm</quantity>
(specimen FMNH-P30182) and 
<quantity id="10159B5FFF97FF95FDE27C1BFD53794E" box="[564,653,783,810]" metricMagnitude="-4" metricUnit="m" metricValue="7.0" pageId="59" pageNumber="60" unit="mm" value="0.7">0.7 mm</quantity>
(specimen FMNH-P30184). The shaft is endogastrically curved and starts at a diameter of 
<quantity id="10159B5FFF97FF95FE267C26FD947929" box="[496,586,818,845]" metricMagnitude="-3" metricUnit="m" metricValue="1.2" pageId="59" pageNumber="60" unit="mm" value="1.2">1.2 mm</quantity>
(specimen FMNH-P30184) and 
<quantity id="10159B5FFF97FF95FC1A7C26FBFB7929" box="[972,1061,818,845]" metricMagnitude="-4" metricUnit="m" metricValue="9.0" pageId="59" pageNumber="60" unit="mm" value="0.9">0.9 mm</quantity>
(specimen FMNH-P30182), respectively. The conch grows toward 
<quantity id="10159B5FFF97FF95FDA87C42FD067914" box="[638,728,854,880]" metricMagnitude="-3" metricUnit="m" metricValue="2.8" pageId="59" pageNumber="60" unit="mm" value="2.8">2.8 mm</quantity>
within ca 
<quantity id="10159B5FFF97FF95FC877C42FC7D7914" box="[849,931,854,880]" metricMagnitude="-2" metricUnit="m" metricValue="1.7" pageId="59" pageNumber="60" unit="mm" value="17.0">17 mm</quantity>
in FMNH-P30184, and reaches 
<quantity id="10159B5FFF97FF95FACB7C42FAA97914" box="[1309,1399,854,880]" metricMagnitude="-3" metricUnit="m" metricValue="2.3" pageId="59" pageNumber="60" unit="mm" value="2.3">2.3 mm</quantity>
within ca 
<quantity id="10159B5FFF97FF95FEE27C6CFE5779F7" box="[308,393,888,915]" metricMagnitude="-2" metricUnit="m" metricValue="1.5" pageId="59" pageNumber="60" unit="mm" value="15.0">15 mm</quantity>
in FMNH-P30182. A second distinct change in growth pattern occurs at a diameter of ca 
<quantity id="10159B5FFF97FF95FED37C88FE4B79D2" box="[261,405,924,951]" metricMagnitude="-3" metricUnit="m" metricValue="1.6" metricValueMax="1.7" metricValueMin="1.5" pageId="59" pageNumber="60" unit="mm" value="1.6" valueMax="1.7" valueMin="1.5">1.5–1.7 mm</quantity>
and is best seen in specimen FMNH-P30171. There, the conch curvature abruptly decreases and the angle of expansion increases (
<figureCitation id="4FD62A3FFF97FF95FD247CABFC8079BD" box="[754,862,959,985]" captionStart="Fig" captionStartId="22.[189,232,1536,1562]" captionTargetId="figure-11@21.[189,1398,272,2011]" captionTargetPageId="21" captionText="Fig. 12 (previous page). Apical parts of orthoconic cephalopods from the Olenidsletta Member, Floian, Ordovician, near Hinlopenstretet, Ny Friesland, Spitsbergen. A. Cyptendoceras sp. B., FMNH-P30472 from Profilbekken river basin, locality PR-phosphatic. Lateral view with siphuncle toward the left. B. Svalbardoceras sterna gen. et sp. nov, FMNH-P30169, from PO 7.5. Lateral view with siphuncle toward left. C, F–G. Eosomichelinoceras borealis sp. nov. C. Specimen FMNH-P30171, from bed PO 123.3. Lateral view with prosiphuncular side toward the right. D. Bactroceras fluvii sp. nov., FMNH-P30168, from Profilbekken river basin, locality PR-phosphatic, showing the ventral side with ventral sutural lobe. E, H, J. Bactroceras boliviensis Aubrechtová, 2015 from bed PO 131. E. Specimen FMNH-P30165, nearly dorsal view, showing the transition of the extreme apical part toward the juvenile part of the conch. F. Specimen FMNH-P30182, lateral view with siphuncle toward the right. G. Specimen FMNH-P30184, lateral view with siphuncle toward the left. H. Specimen FMNH-P30183, apical view, showing the smooth apical surface of the protoconch. I. Ethanoceras solitudines gen. et sp. nov., FMNH-P30173, from bed PO 123.3, note the fine transverse striation. J. FMNH-P30160, showing details of fine transverse ornamentation. Scale bar = 2 mm for all figures." figureDoi="http://doi.org/10.5281/zenodo.5794307" httpUri="https://zenodo.org/record/5794307/files/figure.png" pageId="59" pageNumber="60">Fig. 12C</figureCitation>
).
</paragraph>
<paragraph id="D75236BAFF97FF95FF6B7B14FDA37E7F" blockId="59.[189,637,1024,1051]" box="[189,637,1024,1051]" pageId="59" pageNumber="60">
<heading id="8C1A81D6FF97FF95FF6B7B14FDA37E7F" bold="true" box="[189,637,1024,1051]" fontSize="11" level="3" pageId="59" pageNumber="60" reason="3">
<emphasis id="E599EAA8FF97FF95FF6B7B14FDA37E7F" bold="true" box="[189,637,1024,1051]" pageId="59" pageNumber="60">Stratigraphic and geographic range</emphasis>
</heading>
</paragraph>
<paragraph id="D75236BAFF97FF95FF6B7B3BFE677E08" blockId="59.[189,1398,1071,1132]" pageId="59" pageNumber="60">
<quantity id="10159B5FFF97FF95FF6B7B3BFEFD7E2E" box="[189,291,1071,1098]" metricMagnitude="2" metricUnit="m" metricValue="1.2029999999999998" pageId="59" pageNumber="60" unit="m" value="120.3">120.3 m</quantity>
(PO 123.3) and 
<quantity id="10159B5FFF97FF95FE2D7B3BFD947E2E" box="[507,586,1071,1098]" metricMagnitude="2" metricUnit="m" metricValue="1.28" pageId="59" pageNumber="60" unit="m" value="128.0">128 m</quantity>
(PO 131) above base of Olenidsletta Member, V2 trilobite zone, Blackhillsian, Floian.
</paragraph>
<paragraph id="D75236BAFF97FF95FF6B7B87FE867EC9" blockId="59.[189,344,1171,1197]" box="[189,344,1171,1197]" pageId="59" pageNumber="60">
<heading id="8C1A81D6FF97FF95FF6B7B87FE867EC9" bold="true" box="[189,344,1171,1197]" fontSize="11" level="3" pageId="59" pageNumber="60" reason="3">
<emphasis id="E599EAA8FF97FF95FF6B7B87FE867EC9" bold="true" box="[189,344,1171,1197]" pageId="59" pageNumber="60">Comparison</emphasis>
</heading>
</paragraph>
<paragraph id="D75236BAFF97FF95FF6B7BD6FBC47FB7" blockId="59.[188,1400,1218,1491]" pageId="59" pageNumber="60">
<taxonomicName id="10ED4D39FF97FF95FF6B7BD6FDCC7EB8" authority="Kröger &amp; Pohle, 2021" authorityName="Kröger &amp; Pohle" authorityYear="2021" box="[189,530,1218,1244]" class="Cephalopoda" family="Baltoceratidae" genus="Eosomichelinoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Orthocerida" pageId="59" pageNumber="60" phylum="Mollusca" rank="species" species="borealis" status="sp. nov.">
<emphasis id="E599EAA8FF97FF95FF6B7BD6FDCC7EB8" box="[189,530,1218,1244]" italics="true" pageId="59" pageNumber="60">Eosomichelinoceras borealis</emphasis>
</taxonomicName>
<taxonomicNameLabel id="FEAA57D3FF97FF95FDCF7BD7FDAA7EB9" box="[537,628,1219,1245]" pageId="59" pageNumber="60" rank="species">sp. nov.</taxonomicNameLabel>
is unique among 
<taxonomicName id="10ED4D39FF97FF95FC917BD6FBEB7EB8" authorityName="Chen" authorityYear="1974" box="[839,1077,1218,1244]" class="Cephalopoda" family="Baltoceratidae" genus="Eosomichelinoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Orthocerida" pageId="59" pageNumber="60" phylum="Mollusca" rank="genus">
<emphasis id="E599EAA8FF97FF95FC917BD6FBEB7EB8" box="[839,1077,1218,1244]" italics="true" pageId="59" pageNumber="60">Eosomichelinoceras</emphasis>
</taxonomicName>
in having a slightly curved juvenile conch and a relatively wide angle of expansion of ca 7°. The 
<typeStatus id="08568818FF97FF95FC287BF2FBEF7F64" box="[1022,1073,1254,1280]" pageId="59" pageNumber="60">type</typeStatus>
species differs additionally in having a wider chamber spacing. In addition, in 
<taxonomicName id="10ED4D39FF97FF95FCFB7A1CFA977F47" authority="Yang, 1978" authorityName="Yang" authorityYear="1978" box="[813,1353,1288,1315]" class="Cephalopoda" family="Baltoceratidae" genus="Eosomichelinoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Orthocerida" pageId="59" pageNumber="60" phylum="Mollusca" rank="species" species="guizhouense">
<emphasis id="E599EAA8FF97FF95FCFB7A1CFB687F46" box="[813,1206,1288,1314]" italics="true" pageId="59" pageNumber="60">Eosomichelinoceras guizhouense</emphasis>
Yang, 1978
</taxonomicName>
the siphuncle is more central in position; in 
<taxonomicName id="10ED4D39FF97FF95FD5A7A38FB3A7F22" authority="Chen &amp; Zou, 1984" authorityName="Chen &amp; Zou" authorityYear="1984" box="[652,1252,1324,1350]" class="Cephalopoda" family="Baltoceratidae" genus="Eosomichelinoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Orthocerida" pageId="59" pageNumber="60" phylum="Mollusca" rank="species" species="ordosoense">
<emphasis id="E599EAA8FF97FF95FD5A7A38FBDB7F22" box="[652,1029,1324,1350]" italics="true" pageId="59" pageNumber="60">Eosomichelinoceras ordosoense</emphasis>
Chen &amp; Zou, 1984
</taxonomicName>
additionally the siphuncle is more eccentrically positioned. 
<taxonomicName id="10ED4D39FF97FF95FD3D7A5BFAFC7F0D" authority="Kroger et al., 2007" authorityName="Kroger" authorityYear="2007" box="[747,1314,1359,1386]" class="Cephalopoda" family="Baltoceratidae" genus="Eosomichelinoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Orthocerida" pageId="59" pageNumber="60" phylum="Mollusca" rank="species" species="baldisii">
<emphasis id="E599EAA8FF97FF95FD3D7A5BFBE67F0D" box="[747,1080,1359,1385]" italics="true" pageId="59" pageNumber="60">Eosomichelinoceras baldisii</emphasis>
<bibRefCitation id="B37C4B4BFF97FF95FB977A44FAFC7F0D" author="Kroger B. &amp; Beresi M. &amp; Landing E." box="[1089,1314,1359,1386]" pageId="59" pageNumber="60" pagination="1266 - 1283" refId="ref48423" refString="Kroger B., Beresi M. &amp; Landing E. 2007. Early orthoceratoid cephalopods of the Argentine Precordillera (Lower - Middle Ordovician). Journal of Paleontology 81: 1266 - 1283. https: // doi. org / 10.1666 / 06 - 013.1" type="journal article" year="2007">
Kröger 
<emphasis id="E599EAA8FF97FF95FB4B7A44FB067F0D" box="[1181,1240,1359,1385]" italics="true" pageId="59" pageNumber="60">et al.</emphasis>
, 2007
</bibRefCitation>
</taxonomicName>
differs from the new species in having a compressed conch cross section. Apical parts of species assigned to 
<taxonomicName id="10ED4D39FF97FF95FF697A81FE737FCB" authorityName="Chen" authorityYear="1974" box="[191,429,1429,1455]" class="Cephalopoda" family="Baltoceratidae" genus="Eosomichelinoceras" higherTaxonomySource="GBIF" kingdom="Animalia" order="Orthocerida" pageId="59" pageNumber="60" phylum="Mollusca" rank="genus">
<emphasis id="E599EAA8FF97FF95FF697A81FE737FCB" box="[191,429,1429,1455]" italics="true" pageId="59" pageNumber="60">Eosomichelinoceras</emphasis>
</taxonomicName>
are only known so far from specimens from the Olenidsletta Member, making a comparison of this growth stage with other species impossible at present.
</paragraph>
</subSubSection>
</treatment>
</document>