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<document id="2EB737EEF730D62C71D21D7B319368B5" ID-CLB-Dataset="24290" ID-DOI="10.11646/zootaxa.4728.1.8" ID-GBIF-Dataset="865692a2-cc90-4a8d-9edc-a7c42a1d1d87" ID-ISSN="1175-5326" ID-Zenodo-Dep="3614603" ID-ZooBank="B8F6892A-B258-48C5-A6C8-00E19D38A012" IM.materialsCitations_approvedBy="felipe" IM.metadata_approvedBy="felipe" IM.tables_requiresApprovalFor="existingObjects,plazi" IM.taxonomicNames_approvedBy="felipe" checkinTime="1579589141942" checkinUser="plazi" docAuthor="López-Gappa, J., Liuzzi, M. G. &amp; Pereyra, C." docDate="2020" docId="03D07F47FFBEFFF0FF79B158FB58D0EF" docLanguage="en" docName="zootaxa.4728.1.8.pdf" docOrigin="Zootaxa 4728 (1)" docStyle="DocumentStyle:647186512141C8FC8976D5BCC54AEB7D.9:Zootaxa.2013-.journal_article" docStyleId="647186512141C8FC8976D5BCC54AEB7D" docStyleName="Zootaxa.2013-.journal_article" docStyleVersion="9" docTitle="Hippomonavella charrua López-Gappa &amp; Liuzzi &amp; Pereyra 2020, n. sp." docType="treatment" docVersion="8" lastPageNumber="147" masterDocId="FFE9073FFFBCFFF4FFEEB029FFA9D014" masterDocTitle="A new species of Hippomonavella (Bryozoa: Cheilostomata) from the Holocene and Recent of Argentina and Uruguay (Southwest Atlantic)" masterLastPageNumber="148" masterPageNumber="143" pageNumber="145" updateTime="1698778354287" updateUser="ExternalLinkService" zenodo-license-document="CLOSED">
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<mods:title id="B8AC77840DC01129A8ACE53DE94C0A6B">A new species of Hippomonavella (Bryozoa: Cheilostomata) from the Holocene and Recent of Argentina and Uruguay (Southwest Atlantic)</mods:title>
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<mods:namePart id="5E0FF5BBAC2A153E927AE752EA3FC06C">López-Gappa, J.</mods:namePart>
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<mods:namePart id="5F7A75EB91209C6F99B308E1E6651457">Liuzzi, M. G.</mods:namePart>
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<mods:namePart id="DA1AF00A8EB6B14824044C43ECDBEC92">Pereyra, C.</mods:namePart>
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<mods:title id="0A95E0FDA4DADEF36BA436E70187577E">Zootaxa</mods:title>
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<mods:date id="25C340FC05DA3C1F4B617CDE0608F88B">2020</mods:date>
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<mods:number id="17A8EA301E7F581E198A9807A2E1FE7F">2020-01-21</mods:number>
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<mods:number id="8BFFD9526F09758C9E0AC1B2F37E66F5">4728</mods:number>
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<mods:identifier id="C3F45F62300BE006F0B85D295B581533" type="DOI">10.11646/zootaxa.4728.1.8</mods:identifier>
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<treatment id="03D07F47FFBEFFF0FF79B158FB58D0EF" ID-DOI="http://doi.org/10.5281/zenodo.5695573" ID-GBIF-Taxon="161785855" ID-Zenodo-Dep="5695573" LSID="urn:lsid:plazi:treatment:03D07F47FFBEFFF0FF79B158FB58D0EF" httpUri="http://treatment.plazi.org/id/03D07F47FFBEFFF0FF79B158FB58D0EF" lastPageId="4" lastPageNumber="147" pageId="2" pageNumber="145">
<subSubSection id="C3639DDAFFBEFFF6FF79B158FDBAD198" box="[151,531,369,396]" pageId="2" pageNumber="145" type="nomenclature">
<paragraph id="8BC6CE51FFBEFFF6FF79B158FDBAD198" blockId="2.[151,531,369,431]" box="[151,531,369,396]" pageId="2" pageNumber="145">
<heading id="D08E793DFFBEFFF6FF79B158FDBAD198" bold="true" box="[151,531,369,396]" fontSize="11" level="1" pageId="2" pageNumber="145" reason="1">
<emphasis id="B90D1243FFBEFFF6FF79B158FDBAD198" bold="true" box="[151,531,369,396]" pageId="2" pageNumber="145">
<taxonomicName id="4C79B5D2FFBEFFF6FF79B158FE60D198" authority="López-Gappa &amp; Liuzzi &amp; Pereyra, 2020" authorityName="López-Gappa &amp; Liuzzi &amp; Pereyra" authorityYear="2020" box="[151,457,369,396]" class="Gymnolaemata" family="Bitectiporidae" genus="Hippomonavella" kingdom="Animalia" order="Cheilostomatida" pageId="2" pageNumber="145" phylum="Bryozoa" rank="species" species="charrua" status="sp. nov.">
<emphasis id="B90D1243FFBEFFF6FF79B158FE60D198" bold="true" box="[151,457,369,396]" italics="true" pageId="2" pageNumber="145">Hippomonavella charrua</emphasis>
</taxonomicName>
<taxonomicNameLabel id="A23EAF38FFBEFFF6FE3EB15BFDBAD198" box="[464,531,370,396]" pageId="2" pageNumber="145" rank="species">n. sp.</taxonomicNameLabel>
</emphasis>
</heading>
</paragraph>
</subSubSection>
<subSubSection id="C3639DDAFFBEFFF6FF79B1BCFEE5D1BB" box="[151,332,405,431]" pageId="2" pageNumber="145" type="description">
<paragraph id="8BC6CE51FFBEFFF6FF79B1BCFEE5D1BB" blockId="2.[151,531,369,431]" box="[151,332,405,431]" pageId="2" pageNumber="145">
(
<figureCitation id="1342D2D4FFBEFFF6FF4EB1BCFF4CD1BB" box="[160,229,405,431]" captionStart="FIGURE 2" captionStartId="3.[151,250,1907,1932]" captionTargetBox="[209,1379,167,1888]" captionTargetId="figure@3.[208,1380,166,1888]" captionTargetPageId="3" captionText="FIGURE 2. Hippomonavella charrua n. sp. A. General aspect. B. Detail of avicularia; the arrow shows the pore associated with the avicularium. C. Ovicelled zooids; the arrows show the spine bases. D. Detail of pore plates in a lateral wall. E.Ancestrula (a) and early astogeny. F. General aspect of a mid-Holocene specimen. G. Zooids and avicularia in the mid-Holocene material. A, B, D: holotype; C: paratype; E: MACN-In 42241; F, G: MLP 36237. Scale bars: A, 500 µm; B–E, G, 200 µm; F, 1 mm." figureDoi="http://doi.org/10.5281/zenodo.3614607" httpUri="https://zenodo.org/record/3614607/files/figure.png" pageId="2" pageNumber="145">Fig. 2</figureCitation>
;
<tableCitation id="C6FBFBEAFFBEFFF6FF1EB1BCFEE8D1BB" box="[240,321,405,431]" captionStart="TABLE 1" captionStartId="2.[151,239,1595,1619]" captionTargetPageId="2" captionText="TABLE 1. Measurements (mm) of Hippomonavella charrua n. sp., holotype." httpUri="http://table.plazi.org/id/DF069ED9FFBEFFF6FF79B612FC7CD647" pageId="2" pageNumber="145" tableUuid="DF069ED9FFBEFFF6FF79B612FC7CD647">Table 1</tableCitation>
)
</paragraph>
</subSubSection>
<subSubSection id="C3639DDAFFBEFFF6FF79B1F7FE82D20F" pageId="2" pageNumber="145" type="etymology">
<paragraph id="8BC6CE51FFBEFFF6FF79B1F7FE82D20F" blockId="2.[151,1437,477,1547]" pageId="2" pageNumber="145">
<emphasis id="B90D1243FFBEFFF6FF79B1F7FEB7D1EC" bold="true" box="[151,286,478,504]" pageId="2" pageNumber="145">Etymology.</emphasis>
The species honours the memory of the charruan people, the aboriginal inhabitants of
<collectingCountry id="F36E8EC1FFBEFFF6FB34B1F7FA95D1EC" box="[1242,1340,478,504]" name="Uruguay" pageId="2" pageNumber="145">Uruguay</collectingCountry>
and part of
<collectingCountry id="F36E8EC1FFBEFFF6FF5AB228FE8ED20F" box="[180,295,513,539]" name="Argentina" pageId="2" pageNumber="145">Argentina</collectingCountry>
.
</paragraph>
</subSubSection>
<subSubSection id="C3639DDAFFBEFFF6FF29B20CFD3ED32F" pageId="2" pageNumber="145" type="materials_examined">
<paragraph id="8BC6CE51FFBEFFF6FF29B20CFD3ED32F" blockId="2.[151,1437,477,1547]" pageId="2" pageNumber="145">
<materialsCitation id="3B11C40CFFBEFFF6FF29B20CFD79D270" ID-GBIF-Occurrence="2556427146" collectingDate="1925-07-24" latitude="-34.633335" longitude="-52.25" pageId="2" pageNumber="145" typeStatus="holotype">
<emphasis id="B90D1243FFBEFFF6FF29B20CFE1BD254" bold="true" box="[199,434,549,576]" pageId="2" pageNumber="145">Material examined.</emphasis>
<emphasis id="B90D1243FFBEFFF6FE54B20CFD88D22B" box="[442,545,549,575]" italics="true" pageId="2" pageNumber="145">
<typeStatus id="54C270F3FFBEFFF6FE54B20CFD88D22B" box="[442,545,549,575]" pageId="2" pageNumber="145" type="holotype">Holotype</typeStatus>
</emphasis>
: MACN-In 15933–1. A bilaminar fragment.
<emphasis id="B90D1243FFBEFFF6FBF1B20CFBD8D22B" box="[1055,1137,549,575]" italics="true" pageId="2" pageNumber="145">Undine</emphasis>
,
<geoCoordinate id="EE4DA896FFBEFFF6FB6EB20CFB48D22B" box="[1152,1249,549,575]" degrees="34" direction="south" minutes="38" orientation="latitude" pageId="2" pageNumber="145" precision="925" value="-34.633335">34º38’ S</geoCoordinate>
,
<geoCoordinate id="EE4DA896FFBEFFF6FB01B20CFAF0D254" box="[1263,1369,549,576]" degrees="52" direction="west" minutes="15" orientation="longitude" pageId="2" pageNumber="145" precision="925" value="-52.25">52º15’ W</geoCoordinate>
,
<quantity id="4C8163B4FFBEFFF6FA8BB20CFF48D270" metricMagnitude="2" metricUnit="m" metricValue="1.2349999999999999" metricValueMax="1.28" metricValueMin="1.19" pageId="2" pageNumber="145" unit="m" value="123.5" valueMax="128.0" valueMin="119.0">119– 128 m</quantity>
, leg. Capt. C. Alexandersson,
<date id="FFC7E891FFBEFFF6FDD9B260FD65D270" box="[567,716,585,612]" pageId="2" pageNumber="145" value="1925-07-24">24 July 1925</date>
.
</materialsCitation>
<materialsCitation id="3B11C40CFFBEFFF6FD36B263FC98D293" ID-GBIF-Occurrence="2556427147" pageId="2" pageNumber="145" typeStatus="paratype">
<emphasis id="B90D1243FFBEFFF6FD36B263FC96D277" box="[728,831,586,611]" italics="true" pageId="2" pageNumber="145">
<typeStatus id="54C270F3FFBEFFF6FD36B263FC96D277" box="[728,831,586,611]" pageId="2" pageNumber="145" type="paratype">Paratype</typeStatus>
</emphasis>
: MACN-In 15933–2. A bilaminar fragment, formerly growing on a hydrozoan stem. Same details as
<typeStatus id="54C270F3FFBEFFF6FD29B244FC84D293" box="[711,813,621,647]" pageId="2" pageNumber="145" type="holotype">holotype</typeStatus>
.
</materialsCitation>
<materialsCitation id="3B11C40CFFBEFFF6FCD5B244FD3ED32F" ID-GBIF-Occurrence="2556427145" latitude="-35.97172" longitude="-57.449413" pageId="2" pageNumber="145" stateProvince="Buenos Aires Province">
<emphasis id="B90D1243FFBEFFF6FCD5B244FBF4D293" box="[827,1117,621,647]" italics="true" pageId="2" pageNumber="145">Other material examined</emphasis>
: MACN-In 42241. Several encrusting colonies on
<taxonomicName id="4C79B5D2FFBEFFF6FE73B2B8FD93D2BF" box="[413,570,657,683]" class="Gymnolaemata" family="Arachnopusiidae" genus="Arachnopusia" kingdom="Animalia" order="Cheilostomatida" pageId="2" pageNumber="145" phylum="Bryozoa" rank="genus">
<emphasis id="B90D1243FFBEFFF6FE73B2B8FD93D2BF" box="[413,570,657,683]" italics="true" pageId="2" pageNumber="145">Arachnopusia</emphasis>
</taxonomicName>
sp. Labeled “Quequén”, but lacking further information. The accompanying fauna suggests that this material might have been collected by a trawler landing its cargo at Quequén Harbour. It is quite possible that it comes from the continental shelf off
<collectingRegion id="49BD00B3FFBEFFF6FCCFB2F3FB8FD2E7" box="[801,1062,729,756]" country="Argentina" name="Buenos Aires" pageId="2" pageNumber="145">Buenos Aires Province</collectingRegion>
. MLP 36237. A bilaminar colony fragment,
<geoCoordinate id="EE4DA896FFBEFFF6FEE7B2D4FE11D303" box="[265,440,765,792]" degrees="35" direction="south" minutes="58" orientation="latitude" pageId="2" pageNumber="145" precision="1" seconds="18.20" value="-35.97172">35°58’18.20” S</geoCoordinate>
,
<geoCoordinate id="EE4DA896FFBEFFF6FE2DB2D4FDD2D30C" box="[451,635,765,792]" degrees="57" direction="west" minutes="26" orientation="longitude" pageId="2" pageNumber="145" precision="1" seconds="57.88" value="-57.449413">57°26’57.88” W</geoCoordinate>
, mid-Holocene, on the left margin of Canal 15. MLP 36238.A bilaminar fragment. Same details as previous specimen.
</materialsCitation>
</paragraph>
</subSubSection>
<subSubSection id="C3639DDAFFBEFFF6FF29B36CFCA0D61F" pageId="2" pageNumber="145" type="description">
<paragraph id="8BC6CE51FFBEFFF6FF29B36CFCA0D61F" blockId="2.[151,1437,477,1547]" pageId="2" pageNumber="145">
<emphasis id="B90D1243FFBEFFF6FF29B36CFEF0D374" bold="true" box="[199,345,837,864]" pageId="2" pageNumber="145">Description.</emphasis>
Colony encrusting unilaminar or erect bilaminar. Zooids ordered in quincunx, twice as long as wide, delimited by well-marked borders (
<figureCitation id="1342D2D4FFBEFFF6FD89B340FD00D397" box="[615,681,873,899]" captionStart="FIGURE 2" captionStartId="3.[151,250,1907,1932]" captionTargetBox="[209,1379,167,1888]" captionTargetId="figure@3.[208,1380,166,1888]" captionTargetPageId="3" captionText="FIGURE 2. Hippomonavella charrua n. sp. A. General aspect. B. Detail of avicularia; the arrow shows the pore associated with the avicularium. C. Ovicelled zooids; the arrows show the spine bases. D. Detail of pore plates in a lateral wall. E.Ancestrula (a) and early astogeny. F. General aspect of a mid-Holocene specimen. G. Zooids and avicularia in the mid-Holocene material. A, B, D: holotype; C: paratype; E: MACN-In 42241; F, G: MLP 36237. Scale bars: A, 500 µm; B–E, G, 200 µm; F, 1 mm." figureDoi="http://doi.org/10.5281/zenodo.3614607" httpUri="https://zenodo.org/record/3614607/files/figure.png" pageId="2" pageNumber="145">Fig. 2</figureCitation>
A–C). Frontal shield smooth in zooids near the colony margin (
<figureCitation id="1342D2D4FFBEFFF6FA81B340FF14D3B3" captionStart="FIGURE 2" captionStartId="3.[151,250,1907,1932]" captionTargetBox="[209,1379,167,1888]" captionTargetId="figure@3.[208,1380,166,1888]" captionTargetPageId="3" captionText="FIGURE 2. Hippomonavella charrua n. sp. A. General aspect. B. Detail of avicularia; the arrow shows the pore associated with the avicularium. C. Ovicelled zooids; the arrows show the spine bases. D. Detail of pore plates in a lateral wall. E.Ancestrula (a) and early astogeny. F. General aspect of a mid-Holocene specimen. G. Zooids and avicularia in the mid-Holocene material. A, B, D: holotype; C: paratype; E: MACN-In 42241; F, G: MLP 36237. Scale bars: A, 500 µm; B–E, G, 200 µm; F, 1 mm." figureDoi="http://doi.org/10.5281/zenodo.3614607" httpUri="https://zenodo.org/record/3614607/files/figure.png" pageId="2" pageNumber="145">Fig. 2A</figureCitation>
), tuberculated in older areas of the colony (
<figureCitation id="1342D2D4FFBEFFF6FD43B3A4FCAED3B3" box="[685,775,909,935]" captionStart="FIGURE 2" captionStartId="3.[151,250,1907,1932]" captionTargetBox="[209,1379,167,1888]" captionTargetId="figure@3.[208,1380,166,1888]" captionTargetPageId="3" captionText="FIGURE 2. Hippomonavella charrua n. sp. A. General aspect. B. Detail of avicularia; the arrow shows the pore associated with the avicularium. C. Ovicelled zooids; the arrows show the spine bases. D. Detail of pore plates in a lateral wall. E.Ancestrula (a) and early astogeny. F. General aspect of a mid-Holocene specimen. G. Zooids and avicularia in the mid-Holocene material. A, B, D: holotype; C: paratype; E: MACN-In 42241; F, G: MLP 36237. Scale bars: A, 500 µm; B–E, G, 200 µm; F, 1 mm." figureDoi="http://doi.org/10.5281/zenodo.3614607" httpUri="https://zenodo.org/record/3614607/files/figure.png" pageId="2" pageNumber="145">Fig. 2C</figureCitation>
), slightly convex, with a row of 12 to 20 (median: 16, depending on zooid size) conspicuous marginal areolae separated by ridges (
<figureCitation id="1342D2D4FFBEFFF6FC20B398FBB9D3DF" box="[974,1040,945,971]" captionStart="FIGURE 2" captionStartId="3.[151,250,1907,1932]" captionTargetBox="[209,1379,167,1888]" captionTargetId="figure@3.[208,1380,166,1888]" captionTargetPageId="3" captionText="FIGURE 2. Hippomonavella charrua n. sp. A. General aspect. B. Detail of avicularia; the arrow shows the pore associated with the avicularium. C. Ovicelled zooids; the arrows show the spine bases. D. Detail of pore plates in a lateral wall. E.Ancestrula (a) and early astogeny. F. General aspect of a mid-Holocene specimen. G. Zooids and avicularia in the mid-Holocene material. A, B, D: holotype; C: paratype; E: MACN-In 42241; F, G: MLP 36237. Scale bars: A, 500 µm; B–E, G, 200 µm; F, 1 mm." figureDoi="http://doi.org/10.5281/zenodo.3614607" httpUri="https://zenodo.org/record/3614607/files/figure.png" pageId="2" pageNumber="145">Fig. 2</figureCitation>
A–C). Orifice roundly subquadrate, with a convex distal margin and a straight to convex proximal margin, surrounded by a low peristome with lateral and proximal flaps (
<figureCitation id="1342D2D4FFBEFFF6FE99B3D0FE66D407" box="[375,463,1017,1043]" captionStart="FIGURE 2" captionStartId="3.[151,250,1907,1932]" captionTargetBox="[209,1379,167,1888]" captionTargetId="figure@3.[208,1380,166,1888]" captionTargetPageId="3" captionText="FIGURE 2. Hippomonavella charrua n. sp. A. General aspect. B. Detail of avicularia; the arrow shows the pore associated with the avicularium. C. Ovicelled zooids; the arrows show the spine bases. D. Detail of pore plates in a lateral wall. E.Ancestrula (a) and early astogeny. F. General aspect of a mid-Holocene specimen. G. Zooids and avicularia in the mid-Holocene material. A, B, D: holotype; C: paratype; E: MACN-In 42241; F, G: MLP 36237. Scale bars: A, 500 µm; B–E, G, 200 µm; F, 1 mm." figureDoi="http://doi.org/10.5281/zenodo.3614607" httpUri="https://zenodo.org/record/3614607/files/figure.png" pageId="2" pageNumber="145">Fig. 2B</figureCitation>
). One pair of blunt, robust condyles angled proximally, close to the proximal margin of the orifice (
<figureCitation id="1342D2D4FFBEFFF6FEF5B434FEDCD423" box="[283,373,1053,1079]" captionStart="FIGURE 2" captionStartId="3.[151,250,1907,1932]" captionTargetBox="[209,1379,167,1888]" captionTargetId="figure@3.[208,1380,166,1888]" captionTargetPageId="3" captionText="FIGURE 2. Hippomonavella charrua n. sp. A. General aspect. B. Detail of avicularia; the arrow shows the pore associated with the avicularium. C. Ovicelled zooids; the arrows show the spine bases. D. Detail of pore plates in a lateral wall. E.Ancestrula (a) and early astogeny. F. General aspect of a mid-Holocene specimen. G. Zooids and avicularia in the mid-Holocene material. A, B, D: holotype; C: paratype; E: MACN-In 42241; F, G: MLP 36237. Scale bars: A, 500 µm; B–E, G, 200 µm; F, 1 mm." figureDoi="http://doi.org/10.5281/zenodo.3614607" httpUri="https://zenodo.org/record/3614607/files/figure.png" pageId="2" pageNumber="145">Fig. 2C</figureCitation>
). A pair of cylindrical, disto-lateral oral spines, not observed in ovicelled zooids (
<figureCitation id="1342D2D4FFBEFFF6FAFCB434FA26D423" box="[1298,1423,1053,1079]" captionStart="FIGURE 2" captionStartId="3.[151,250,1907,1932]" captionTargetBox="[209,1379,167,1888]" captionTargetId="figure@3.[208,1380,166,1888]" captionTargetPageId="3" captionText="FIGURE 2. Hippomonavella charrua n. sp. A. General aspect. B. Detail of avicularia; the arrow shows the pore associated with the avicularium. C. Ovicelled zooids; the arrows show the spine bases. D. Detail of pore plates in a lateral wall. E.Ancestrula (a) and early astogeny. F. General aspect of a mid-Holocene specimen. G. Zooids and avicularia in the mid-Holocene material. A, B, D: holotype; C: paratype; E: MACN-In 42241; F, G: MLP 36237. Scale bars: A, 500 µm; B–E, G, 200 µm; F, 1 mm." figureDoi="http://doi.org/10.5281/zenodo.3614607" httpUri="https://zenodo.org/record/3614607/files/figure.png" pageId="2" pageNumber="145">Fig. 2A, C</figureCitation>
). Avicularia median, suboral, directed proximally, close to the orifice, subtriangular, with a rounded apex and a complete cross-bar without ligula, protruding over the frontal shield (
<figureCitation id="1342D2D4FFBEFFF6FC81B44CFC41D494" box="[879,1000,1125,1152]" captionStart="FIGURE 2" captionStartId="3.[151,250,1907,1932]" captionTargetBox="[209,1379,167,1888]" captionTargetId="figure@3.[208,1380,166,1888]" captionTargetPageId="3" captionText="FIGURE 2. Hippomonavella charrua n. sp. A. General aspect. B. Detail of avicularia; the arrow shows the pore associated with the avicularium. C. Ovicelled zooids; the arrows show the spine bases. D. Detail of pore plates in a lateral wall. E.Ancestrula (a) and early astogeny. F. General aspect of a mid-Holocene specimen. G. Zooids and avicularia in the mid-Holocene material. A, B, D: holotype; C: paratype; E: MACN-In 42241; F, G: MLP 36237. Scale bars: A, 500 µm; B–E, G, 200 µm; F, 1 mm." figureDoi="http://doi.org/10.5281/zenodo.3614607" httpUri="https://zenodo.org/record/3614607/files/figure.png" pageId="2" pageNumber="145">Fig. 2A, B</figureCitation>
); a pair of associated distolateral pores is located in the angle formed by the avicularium and the peristome (
<figureCitation id="1342D2D4FFBEFFF6FC78B4A0FC47D4B7" box="[918,1006,1161,1187]" captionStart="FIGURE 2" captionStartId="3.[151,250,1907,1932]" captionTargetBox="[209,1379,167,1888]" captionTargetId="figure@3.[208,1380,166,1888]" captionTargetPageId="3" captionText="FIGURE 2. Hippomonavella charrua n. sp. A. General aspect. B. Detail of avicularia; the arrow shows the pore associated with the avicularium. C. Ovicelled zooids; the arrows show the spine bases. D. Detail of pore plates in a lateral wall. E.Ancestrula (a) and early astogeny. F. General aspect of a mid-Holocene specimen. G. Zooids and avicularia in the mid-Holocene material. A, B, D: holotype; C: paratype; E: MACN-In 42241; F, G: MLP 36237. Scale bars: A, 500 µm; B–E, G, 200 µm; F, 1 mm." figureDoi="http://doi.org/10.5281/zenodo.3614607" httpUri="https://zenodo.org/record/3614607/files/figure.png" pageId="2" pageNumber="145">Fig. 2B</figureCitation>
). Interzooidal communication by multiporous pore plates in the lateral walls (
<figureCitation id="1342D2D4FFBEFFF6FDBAB484FD07D4D3" box="[596,686,1197,1223]" captionStart="FIGURE 2" captionStartId="3.[151,250,1907,1932]" captionTargetBox="[209,1379,167,1888]" captionTargetId="figure@3.[208,1380,166,1888]" captionTargetPageId="3" captionText="FIGURE 2. Hippomonavella charrua n. sp. A. General aspect. B. Detail of avicularia; the arrow shows the pore associated with the avicularium. C. Ovicelled zooids; the arrows show the spine bases. D. Detail of pore plates in a lateral wall. E.Ancestrula (a) and early astogeny. F. General aspect of a mid-Holocene specimen. G. Zooids and avicularia in the mid-Holocene material. A, B, D: holotype; C: paratype; E: MACN-In 42241; F, G: MLP 36237. Scale bars: A, 500 µm; B–E, G, 200 µm; F, 1 mm." figureDoi="http://doi.org/10.5281/zenodo.3614607" httpUri="https://zenodo.org/record/3614607/files/figure.png" pageId="2" pageNumber="145">Fig. 2D</figureCitation>
). The distal and proximal walls have uniporous pore plates. Ovicell hyperstomial, not closed by the operculum (acleithral), initially spherical and protruding, then subimmersed in the distal zooid, its margins covered by the frontal walls of the neighbouring zooids, pierced by about 40 pseudopores distributed throughout its surface (
<figureCitation id="1342D2D4FFBEFFF6FDC7B530FD2FD527" box="[553,646,1305,1331]" captionStart="FIGURE 2" captionStartId="3.[151,250,1907,1932]" captionTargetBox="[209,1379,167,1888]" captionTargetId="figure@3.[208,1380,166,1888]" captionTargetPageId="3" captionText="FIGURE 2. Hippomonavella charrua n. sp. A. General aspect. B. Detail of avicularia; the arrow shows the pore associated with the avicularium. C. Ovicelled zooids; the arrows show the spine bases. D. Detail of pore plates in a lateral wall. E.Ancestrula (a) and early astogeny. F. General aspect of a mid-Holocene specimen. G. Zooids and avicularia in the mid-Holocene material. A, B, D: holotype; C: paratype; E: MACN-In 42241; F, G: MLP 36237. Scale bars: A, 500 µm; B–E, G, 200 µm; F, 1 mm." figureDoi="http://doi.org/10.5281/zenodo.3614607" httpUri="https://zenodo.org/record/3614607/files/figure.png" pageId="2" pageNumber="145">Fig. 2C</figureCitation>
). Ancestrula tatiform (length ~
<quantity id="4C8163B4FFBEFFF6FC00B530FBE4D520" box="[1006,1101,1305,1332]" metricMagnitude="-1" metricUnit="m" metricValue="2.2" pageId="2" pageNumber="145" unit="mm" value="220.0">220 µm</quantity>
), with 9 delicate, cylindrical spines around a circular opesia and a band of proximal cryptocyst (
<figureCitation id="1342D2D4FFBEFFF6FC70B514FC5ED543" box="[926,1015,1341,1367]" captionStart="FIGURE 2" captionStartId="3.[151,250,1907,1932]" captionTargetBox="[209,1379,167,1888]" captionTargetId="figure@3.[208,1380,166,1888]" captionTargetPageId="3" captionText="FIGURE 2. Hippomonavella charrua n. sp. A. General aspect. B. Detail of avicularia; the arrow shows the pore associated with the avicularium. C. Ovicelled zooids; the arrows show the spine bases. D. Detail of pore plates in a lateral wall. E.Ancestrula (a) and early astogeny. F. General aspect of a mid-Holocene specimen. G. Zooids and avicularia in the mid-Holocene material. A, B, D: holotype; C: paratype; E: MACN-In 42241; F, G: MLP 36237. Scale bars: A, 500 µm; B–E, G, 200 µm; F, 1 mm." figureDoi="http://doi.org/10.5281/zenodo.3614607" httpUri="https://zenodo.org/record/3614607/files/figure.png" pageId="2" pageNumber="145">Fig. 2E</figureCitation>
). The early astogeny is symmetrical. The first 3 zooids budded from the ancestrula (one distal, two distolateral) have 5 spines. In the zone of astogenetic change, zooids in successive whorls increase in size, but the number of oral spines decreases. Most autozooids of the encrusting phase have suboral avicularia. In the erect portions, however, their occurrence is variable: in certain areas they are frequent (about 50% of the zooids), whereas in other ones they are lacking. For instance, in the
<typeStatus id="54C270F3FFBEFFF6FAD4B5E4FA35D5F3" box="[1338,1436,1485,1511]" pageId="2" pageNumber="145" type="holotype">holotype</typeStatus>
fragment, just 8% of the zooids have suboral avicularia.
</paragraph>
</subSubSection>
<caption id="DF069ED9FFBEFFF6FF79B612FC7CD647" ID-Table-UUID="DF069ED9FFBEFFF6FF79B612FC7CD647" box="[151,981,1595,1619]" httpUri="http://table.plazi.org/id/DF069ED9FFBEFFF6FF79B612FC7CD647" pageId="2" pageNumber="145" targetBox="[166,1357,1631,1807]" targetIsTable="true" targetPageId="2">
<paragraph id="8BC6CE51FFBEFFF6FF79B612FC7CD647" blockId="2.[151,981,1595,1619]" box="[151,981,1595,1619]" pageId="2" pageNumber="145">
<emphasis id="B90D1243FFBEFFF6FF79B612FEA3D647" bold="true" box="[151,266,1595,1619]" pageId="2" pageNumber="145">TABLE 1.</emphasis>
Measurements (mm) of
<taxonomicName id="4C79B5D2FFBEFFF6FDFCB612FC89D647" authority="López-Gappa &amp; Liuzzi &amp; Pereyra, 2020" authorityName="López-Gappa &amp; Liuzzi &amp; Pereyra" authorityYear="2020" box="[530,800,1595,1619]" class="Gymnolaemata" family="Bitectiporidae" genus="Hippomonavella" kingdom="Animalia" order="Cheilostomatida" pageId="2" pageNumber="145" phylum="Bryozoa" rank="species" species="charrua" status="sp. nov.">
<emphasis id="B90D1243FFBEFFF6FDFCB612FC89D647" box="[530,800,1595,1619]" italics="true" pageId="2" pageNumber="145">Hippomonavella charrua</emphasis>
</taxonomicName>
<emphasis id="B90D1243FFBEFFF6FCC9B612FCCAD647" bold="true" box="[807,867,1595,1619]" pageId="2" pageNumber="145">
<taxonomicNameLabel id="A23EAF38FFBEFFF6FCC9B612FCCAD647" box="[807,867,1595,1619]" pageId="2" pageNumber="145" rank="species">n. sp.</taxonomicNameLabel>
</emphasis>
, holotype.
</paragraph>
</caption>
<paragraph id="8BC6CE51FFBEFFF6FE31B649FB57D71B" pageId="2" pageNumber="145">
<table id="F9793CF1FFBE000BFF48B676FAE4D71B" box="[166,1357,1631,1807]" gridcols="6" gridrows="5" pageId="2" pageNumber="145">
<tr id="3549CC13FFBE000BFF48B676FAE4D66C" box="[166,1357,1631,1656]" gridrow="0" pageId="2" pageNumber="145" rowspan-0="1">
<th id="7698A56FFFBE000BFE31B676FE51D66C" box="[479,504,1631,1656]" gridcol="1" gridrow="0" pageId="2" pageNumber="145">N</th>
<th id="7698A56FFFBE000BFDC3B676FD06D66C" box="[557,687,1631,1656]" gridcol="2" gridrow="0" pageId="2" pageNumber="145">Zooid length</th>
<th id="7698A56FFFBE000BFCE7B676FC2CD66C" box="[777,901,1631,1656]" gridcol="3" gridrow="0" pageId="2" pageNumber="145">Zooid width</th>
<th id="7698A56FFFBE000BFC34B676FBCED66C" box="[986,1127,1631,1656]" gridcol="4" gridrow="0" pageId="2" pageNumber="145">Orifice length</th>
<th id="7698A56FFFBE000BFB2BB676FAE4D66C" box="[1221,1357,1631,1656]" gridcol="5" gridrow="0" pageId="2" pageNumber="145">Orifice width</th>
</tr>
<tr id="3549CC13FFBE000BFF48B6ACFAE4D68A" box="[166,1357,1669,1694]" gridrow="1" pageId="2" pageNumber="145">
<th id="7698A56FFFBE000BFF48B6ACFECDD68A" box="[166,356,1669,1694]" gridcol="0" gridrow="1" pageId="2" pageNumber="145">Maximum</th>
<td id="7698A56FFFBE000BFE31B6ACFE51D68A" box="[479,504,1669,1694]" gridcol="1" gridrow="1" pageId="2" pageNumber="145">10</td>
<td id="7698A56FFFBE000BFDC3B6ACFD06D68A" box="[557,687,1669,1694]" gridcol="2" gridrow="1" pageId="2" pageNumber="145">0.64</td>
<td id="7698A56FFFBE000BFCE7B6ACFC2CD68A" box="[777,901,1669,1694]" gridcol="3" gridrow="1" pageId="2" pageNumber="145">0.32</td>
<td id="7698A56FFFBE000BFC34B6ACFBCED68A" box="[986,1127,1669,1694]" gridcol="4" gridrow="1" pageId="2" pageNumber="145">0.18</td>
<td id="7698A56FFFBE000BFB2BB6ACFAE4D68A" box="[1221,1357,1669,1694]" gridcol="5" gridrow="1" pageId="2" pageNumber="145">0.17</td>
</tr>
<tr id="3549CC13FFBE000BFF48B683FAE4D6D7" box="[166,1357,1706,1731]" gridrow="2" pageId="2" pageNumber="145">
<th id="7698A56FFFBE000BFF48B683FECDD6D7" box="[166,356,1706,1731]" gridcol="0" gridrow="2" pageId="2" pageNumber="145">Minimum</th>
<td id="7698A56FFFBE000BFE31B683FE51D6D7" box="[479,504,1706,1731]" gridcol="1" gridrow="2" pageId="2" pageNumber="145">10</td>
<td id="7698A56FFFBE000BFDC3B683FD06D6D7" box="[557,687,1706,1731]" gridcol="2" gridrow="2" pageId="2" pageNumber="145">0.48</td>
<td id="7698A56FFFBE000BFCE7B683FC2CD6D7" box="[777,901,1706,1731]" gridcol="3" gridrow="2" pageId="2" pageNumber="145">0.24</td>
<td id="7698A56FFFBE000BFC34B683FBCED6D7" box="[986,1127,1706,1731]" gridcol="4" gridrow="2" pageId="2" pageNumber="145">0.14</td>
<td id="7698A56FFFBE000BFB2BB683FAE4D6D7" box="[1221,1357,1706,1731]" gridcol="5" gridrow="2" pageId="2" pageNumber="145">0.15</td>
</tr>
<tr id="3549CC13FFBE000BFF48B6F9FAE4D6FD" box="[166,1357,1744,1769]" gridrow="3" pageId="2" pageNumber="145">
<th id="7698A56FFFBE000BFF48B6F9FECDD6FD" box="[166,356,1744,1769]" gridcol="0" gridrow="3" pageId="2" pageNumber="145">Mean</th>
<td id="7698A56FFFBE000BFE31B6F9FE51D6FD" box="[479,504,1744,1769]" gridcol="1" gridrow="3" pageId="2" pageNumber="145">10</td>
<td id="7698A56FFFBE000BFDC3B6F9FD06D6FD" box="[557,687,1744,1769]" gridcol="2" gridrow="3" pageId="2" pageNumber="145">0.56</td>
<td id="7698A56FFFBE000BFCE7B6F9FC2CD6FD" box="[777,901,1744,1769]" gridcol="3" gridrow="3" pageId="2" pageNumber="145">0.27</td>
<td id="7698A56FFFBE000BFC34B6F9FBCED6FD" box="[986,1127,1744,1769]" gridcol="4" gridrow="3" pageId="2" pageNumber="145">0.16</td>
<td id="7698A56FFFBE000BFB2BB6F9FAE4D6FD" box="[1221,1357,1744,1769]" gridcol="5" gridrow="3" pageId="2" pageNumber="145">0.16</td>
</tr>
<tr id="3549CC13FFBE000BFF48B6DFFAE4D71B" box="[166,1357,1782,1807]" gridrow="4" pageId="2" pageNumber="145">
<th id="7698A56FFFBE000BFF48B6DFFECDD71B" box="[166,356,1782,1807]" gridcol="0" gridrow="4" pageId="2" pageNumber="145">Standard deviation</th>
<td id="7698A56FFFBE000BFE31B6DFFE51D71B" box="[479,504,1782,1807]" gridcol="1" gridrow="4" pageId="2" pageNumber="145">10</td>
<td id="7698A56FFFBE000BFDC3B6DFFD06D71B" box="[557,687,1782,1807]" gridcol="2" gridrow="4" pageId="2" pageNumber="145">0.048</td>
<td id="7698A56FFFBE000BFCE7B6DFFC2CD71B" box="[777,901,1782,1807]" gridcol="3" gridrow="4" pageId="2" pageNumber="145">0.023</td>
<td id="7698A56FFFBE000BFC34B6DFFBCED71B" box="[986,1127,1782,1807]" gridcol="4" gridrow="4" pageId="2" pageNumber="145">0.012</td>
<td id="7698A56FFFBE000BFB2BB6DFFAE4D71B" box="[1221,1357,1782,1807]" gridcol="5" gridrow="4" pageId="2" pageNumber="145">0.008</td>
</tr>
</table>
</paragraph>
<subSubSection id="C3639DDAFFBEFFF0FF29B769FB58D0EF" lastPageId="4" lastPageNumber="147" pageId="2" pageNumber="145" type="discussion">
<paragraph id="8BC6CE51FFBEFFF6FF29B769FCBFD7D2" blockId="2.[151,1437,1856,1990]" pageId="2" pageNumber="145">
<emphasis id="B90D1243FFBEFFF6FF29B769FE92D74E" bold="true" box="[199,315,1856,1882]" pageId="2" pageNumber="145">Remarks.</emphasis>
The bilaminar colonies of the Recent material were growing on hydrozoan stems. The encrusting colonies were growing on
<taxonomicName id="4C79B5D2FFBEFFF6FE2FB74DFDF7D76A" box="[449,606,1892,1918]" class="Gymnolaemata" family="Arachnopusiidae" genus="Arachnopusia" kingdom="Animalia" order="Cheilostomatida" pageId="2" pageNumber="145" phylum="Bryozoa" rank="genus">
<emphasis id="B90D1243FFBEFFF6FE2FB74DFDF7D76A" box="[449,606,1892,1918]" italics="true" pageId="2" pageNumber="145">Arachnopusia</emphasis>
</taxonomicName>
sp. and the ancestrula was found on an oyster shell. Although most of the bryozoan colonies in the Holocene material occurred on mollusc shells, the fossil specimens of
<taxonomicName id="4C79B5D2FFBEFFF6FB38B7A0FAFDD7B6" authority="López-Gappa &amp; Liuzzi &amp; Pereyra, 2020" authorityName="López-Gappa &amp; Liuzzi &amp; Pereyra" authorityYear="2020" box="[1238,1364,1928,1954]" class="Gymnolaemata" family="Bitectiporidae" genus="Hippomonavella" kingdom="Animalia" order="Cheilostomatida" pageId="2" pageNumber="145" phylum="Bryozoa" rank="species" species="charrua" status="sp. nov.">
<emphasis id="B90D1243FFBEFFF6FB38B7A0FAFDD7B6" box="[1238,1364,1928,1954]" italics="true" pageId="2" pageNumber="145">H. charrua</emphasis>
</taxonomicName>
<emphasis id="B90D1243FFBEFFF6FAB2B7A1FA35D7B6" bold="true" box="[1372,1436,1928,1954]" pageId="2" pageNumber="145">
<taxonomicNameLabel id="A23EAF38FFBEFFF6FAB2B7A1FA35D7B6" box="[1372,1436,1928,1954]" pageId="2" pageNumber="145" rank="species">n. sp.</taxonomicNameLabel>
</emphasis>
were found isolated, fragmented and eroded (
<figureCitation id="1342D2D4FFBEFFF6FD7DB785FCA0D7D2" box="[659,777,1964,1990]" captionStart="FIGURE 2" captionStartId="3.[151,250,1907,1932]" captionTargetBox="[209,1379,167,1888]" captionTargetId="figure@3.[208,1380,166,1888]" captionTargetPageId="3" captionText="FIGURE 2. Hippomonavella charrua n. sp. A. General aspect. B. Detail of avicularia; the arrow shows the pore associated with the avicularium. C. Ovicelled zooids; the arrows show the spine bases. D. Detail of pore plates in a lateral wall. E.Ancestrula (a) and early astogeny. F. General aspect of a mid-Holocene specimen. G. Zooids and avicularia in the mid-Holocene material. A, B, D: holotype; C: paratype; E: MACN-In 42241; F, G: MLP 36237. Scale bars: A, 500 µm; B–E, G, 200 µm; F, 1 mm." figureDoi="http://doi.org/10.5281/zenodo.3614607" httpUri="https://zenodo.org/record/3614607/files/figure.png" pageId="2" pageNumber="145">Fig. 2F, G</figureCitation>
).
</paragraph>
<caption id="DF069ED9FFBFFFF7FF79B75AFAFBD7E3" ID-DOI="http://doi.org/10.5281/zenodo.3614607" ID-Zenodo-Dep="3614607" httpUri="https://zenodo.org/record/3614607/files/figure.png" pageId="3" pageNumber="146" startId="3.[151,250,1907,1932]" targetBox="[209,1379,167,1888]" targetPageId="3">
<paragraph id="8BC6CE51FFBFFFF7FF79B75AFAFBD7E3" blockId="3.[151,1436,1907,2040]" pageId="3" pageNumber="146">
<emphasis id="B90D1243FFBFFFF7FF79B75AFEBBD798" bold="true" box="[151,274,1907,1932]" pageId="3" pageNumber="146">FIGURE 2.</emphasis>
<taxonomicName id="4C79B5D2FFBFFFF7FEF9B75DFDB1D798" authority="López-Gappa &amp; Liuzzi &amp; Pereyra, 2020" authorityName="López-Gappa &amp; Liuzzi &amp; Pereyra" authorityYear="2020" box="[279,536,1908,1932]" class="Gymnolaemata" family="Bitectiporidae" genus="Hippomonavella" kingdom="Animalia" order="Cheilostomatida" pageId="3" pageNumber="146" phylum="Bryozoa" rank="species" species="charrua" status="sp. nov.">
<emphasis id="B90D1243FFBFFFF7FEF9B75DFDB1D798" box="[279,536,1908,1932]" italics="true" pageId="3" pageNumber="146">Hippomonavella charrua</emphasis>
</taxonomicName>
<emphasis id="B90D1243FFBFFFF7FDF3B75DFDFCD798" bold="true" box="[541,597,1908,1932]" pageId="3" pageNumber="146">
<taxonomicNameLabel id="A23EAF38FFBFFFF7FDF3B75DFDFCD798" box="[541,597,1908,1932]" pageId="3" pageNumber="146" rank="species">n. sp.</taxonomicNameLabel>
</emphasis>
A. General aspect. B. Detail of avicularia; the arrow shows the pore associated with the avicularium. C. Ovicelled zooids; the arrows show the spine bases. D. Detail of pore plates in a lateral wall. E. Ancestrula (a) and early astogeny. F. General aspect of a mid-Holocene specimen. G. Zooids and avicularia in the mid-Holocene material. A, B, D: holotype; C: paratype; E: MACN-In 42241; F, G: MLP 36237. Scale bars: A, 500 µm; B–E, G, 200 µm; F, 1 mm.
</paragraph>
</caption>
<paragraph id="8BC6CE51FFB8FFF0FF29B0B1FB58D0EF" blockId="4.[151,1436,152,251]" pageId="4" pageNumber="147">
<emphasis id="B90D1243FFB8FFF0FF29B0B1FD17D0A7" bold="true" box="[199,702,152,179]" pageId="4" pageNumber="147">Geographic and bathymetric distribution.</emphasis>
The species has been found on the continental shelf off
<collectingCountry id="F36E8EC1FFB8FFF0FAD4B0B0FA35D0A7" box="[1338,1436,153,179]" name="Uruguay" pageId="4" pageNumber="147">Uruguay</collectingCountry>
and perhaps also off
<collectingRegion id="49BD00B3FFB8FFF0FE67B094FD26D0C2" box="[393,655,188,215]" country="Argentina" name="Buenos Aires" pageId="4" pageNumber="147">Buenos Aires Province</collectingRegion>
(
<collectingCountry id="F36E8EC1FFB8FFF0FD71B095FCBCD0C3" box="[671,789,188,215]" name="Argentina" pageId="4" pageNumber="147">Argentina</collectingCountry>
), and in mid-Holocene deposits of Canal de las Escobas Formation, Destacamento Río Salado Member (
<figureCitation id="1342D2D4FFB8FFF0FD5EB0C9FD5BD0EF" box="[688,754,224,251]" captionStart="FIGURE 1" captionStartId="1.[151,250,1800,1825]" captionTargetBox="[156,1432,955,1748]" captionTargetId="figure@1.[151,1436,951,1754]" captionTargetPageId="1" captionText="FIGURE 1. Study area. 1: Type locality, MACN-In 15933. 2: Mid-Holocene material, Destacamento Río Salado Member, MLP 36237." figureDoi="http://doi.org/10.5281/zenodo.3614605" httpUri="https://zenodo.org/record/3614605/files/figure.png" pageId="4" pageNumber="147">Fig. 1</figureCitation>
). Its known bathymetric range is
<quantity id="4C8163B4FFB8FFF0FB82B0C8FB44D0EF" box="[1132,1261,225,251]" metricMagnitude="2" metricUnit="m" metricValue="1.2349999999999999" metricValueMax="1.28" metricValueMin="1.19" pageId="4" pageNumber="147" unit="m" value="123.5" valueMax="128.0" valueMin="119.0">
119–
<specimenCount id="9D7F05D8FFB8FFF0FB4AB0C8FB44D0EF" box="[1188,1261,225,251]" pageId="4" pageNumber="147" type="generic">128 m</specimenCount>
</quantity>
.
</paragraph>
</subSubSection>
</treatment>
</document>
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