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<mods:title id="7E6220C2AB44D2633C71D326893BEA87">Southern Ocean Macrostylidae reviewed with a key to the species and new descriptions from Maud Rise</mods:title>
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<mods:namePart id="2E75277AAA9AEF5C0891E491B7A14656">Riehl, Torben</mods:namePart>
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<treatment id="03AF943CFFCEFFB300D7566DFE2E59AA" ID-DOI="http://doi.org/10.5281/zenodo.5681372" ID-GBIF-Taxon="119573255" ID-Zenodo-Dep="5681372" LSID="urn:lsid:plazi:treatment:03AF943CFFCEFFB300D7566DFE2E59AA" httpUri="http://treatment.plazi.org/id/03AF943CFFCEFFB300D7566DFE2E59AA" lastPageId="30" lastPageNumber="190" pageId="29" pageNumber="189">
<subSubSection id="C31C76A1FFCEFFB000D7566DFC495CD0" pageId="29" pageNumber="189" type="nomenclature">
<paragraph id="8BB9252AFFCEFFB000D7566DFDDC5D5F" blockId="29.[151,599,1567,1593]" box="[151,599,1567,1593]" pageId="29" pageNumber="189">
<heading id="D0F19246FFCEFFB000D7566DFDDC5D5F" bold="true" box="[151,599,1567,1593]" fontSize="11" level="1" pageId="29" pageNumber="189" reason="1">
<taxonomicName id="4C065EA9FFCEFFB000D7566DFDDC5D5F" authority="Vey &amp; Brix, 2009" authorityName="Vey &amp; Brix" authorityYear="2009" box="[151,599,1567,1593]" class="Malacostraca" family="Macrostylidae" genus="Macrostylis" kingdom="Animalia" order="Isopoda" pageId="29" pageNumber="189" phylum="Arthropoda" rank="species" species="cerrita">
<emphasis id="B972F938FFCEFFB000D7566DFDDC5D5F" bold="true" box="[151,599,1567,1593]" pageId="29" pageNumber="189">
<emphasis id="B972F938FFCEFFB000D7566DFEF25D5F" bold="true" box="[151,377,1567,1593]" italics="true" pageId="29" pageNumber="189">Macrostylis cerrita</emphasis>
Vey &amp; Brix, 2009
</emphasis>
</taxonomicName>
</heading>
</paragraph>
<paragraph id="8BB9252AFFCEFFB000D75617FC815DFF" blockId="29.[151,893,1637,1690]" pageId="29" pageNumber="189">
urn:lsid:zoobank.org:act:3644D8D7-30A9-462E-9DC1-8D19C948EC9C
<taxonomicName id="4C065EA9FFCEFFB000D756F6FD9D5DFF" authority="Vey &amp; Brix, 2009" authorityName="Vey &amp; Brix" authorityYear="2009" box="[151,534,1667,1690]" class="Malacostraca" family="Macrostylidae" genus="Macrostylis" kingdom="Animalia" order="Isopoda" pageId="29" pageNumber="189" phylum="Arthropoda" rank="species" species="cerrita">
<emphasis id="B972F938FFCEFFB000D756F6FED25DFC" box="[151,345,1668,1690]" italics="true" pageId="29" pageNumber="189">Macrostylis cerrita</emphasis>
Vey &amp; Brix, 2009
</taxonomicName>
; pp. 356370,
<figureCitation id="133D39AFFFCEFFB002EB56F1FC8C5DFF" box="[683,775,1667,1689]" captionStart-0="FIGURE 1" captionStart-1="FIGURE 2" captionStart-2="FIGURE 3" captionStart-3="FIGURE 4" captionStart-4="FIGURE 5" captionStart-5="FIGURE 6" captionStartId-0="1.[151,250,1789,1812]" captionStartId-1="7.[151,250,1589,1612]" captionStartId-2="8.[151,250,1713,1736]" captionStartId-3="9.[151,250,1688,1711]" captionStartId-4="10.[151,250,1564,1587]" captionStartId-5="12.[151,250,1561,1584]" captionTargetBox-0="[151,1436,555,1765]" captionTargetBox-1="[175,1410,191,1570]" captionTargetBox-2="[151,1436,194,1692]" captionTargetBox-3="[151,1436,180,1673]" captionTargetBox-4="[151,1436,198,1543]" captionTargetBox-5="[151,1436,183,1542]" captionTargetId-0="figure@1.[151,1436,555,1765]" captionTargetId-1="figure@7.[175,1411,191,1571]" captionTargetId-2="figure@8.[151,1436,193,1693]" captionTargetId-3="figure@9.[151,1436,175,1674]" captionTargetId-4="figure@10.[151,1436,193,1544]" captionTargetId-5="figure@12.[151,1436,183,1542]" captionTargetPageId-0="1" captionTargetPageId-1="7" captionTargetPageId-2="8" captionTargetPageId-3="9" captionTargetPageId-4="10" captionTargetPageId-5="12" captionText-0="FIGURE 1. Type localities of Macrostylidae from the Southern Ocean. 1) Macrostylis antennamagna Riehl &amp; Brandt, 2010. 2) M. setulosa Mezhov, 1992. 3) M. uniformis Riehl &amp; Brandt, 2010. 4) M. vinogradovae Mezhov, 1992. 5) M. cerrita Ve y &amp; Brix, 2009. 6) M. gerdesi (Brandt, 2002). 7) M. sarsi Brandt, 1992; M. obscura (Brandt, 1992). 8) M. matildae n. sp.; M. scotti n. sp. 9) M. roaldi Riehl &amp; Kaiser, 2012." captionText-1="FIGURE 2. Macrostylis scotti n. sp. A E, holotype adult male (ZMH K- 42990), with ciliate epibionts, photoplate. A, dorsal habitus. B, ventral fossosoma. C, ventral pleotelson. D, ventral cephalothorax. E, ciliate epibionts on right lateral margins of tergites 4 5. Scales: A = 0.5 mm, B D = 0.2 mm, E = 0.1 mm." captionText-2="FIGURE 3. Macrostylis scotti n. sp. A E, holotype adult male (ZMH K- 42990), with ciliate epibionts. A, lateral habitus, ornamentation omitted, setae simplified, uropods partially omitted. B, dorsal habitus, ornamentation omitted, setae simplified, areas free of imbricate ornamentation indicated by thin dashed lines on pereonites 6 7. C, pereopod III, ischium dorsal apex proximal prominent seta damaged. D, ciliate epibiont. E, ventral pleotelson, left setal ridge and ventral setation on left pleopod II omitted. Scales: A, B, E = 0.5 mm, C = 0.3 mm, D = 0.1 mm." captionText-3="FIGURE 4. Macrostylis scotti n. sp. A H, paratype non-ovigerous female (ZMH K- 42992). A, dorsal habitus, impricate ornamentation (IO) omitted. B, antennula and antenna, in situ. C, ventral pleotelson, IO omitted. D, lateral habitus, IO omitted, setae simplified. E, ventral pleopod V. F, ventral pleopod IV. G, ventral pleopod III. H, ventral pleopod II (operculum). Scales: A, C, D = 0.5 mm, B = 0.2 mm, E H = 0.3 mm." captionText-4="FIGURE 5. Macrostylis scotti n. sp. A C, paratype non-ovigerous female (ZMH K- 42992). A, pereopod II. B, pereopod IV. C, pereopod III. Scale: A C = 0.3 mm." captionText-5="FIGURE 6. Macrostylis scotti n. sp. A C, paratype non-ovigerous female (ZMH K- 42992). A, pereopod V. B, pereopod VI. C, pereopod VII. Scale: A C = 0.3 mm." httpUri-0="https://zenodo.org/record/220613/files/figure.png" httpUri-1="https://zenodo.org/record/220614/files/figure.png" httpUri-2="https://zenodo.org/record/220615/files/figure.png" httpUri-3="https://zenodo.org/record/220616/files/figure.png" httpUri-4="https://zenodo.org/record/220617/files/figure.png" httpUri-5="https://zenodo.org/record/220618/files/figure.png" pageId="29" pageNumber="189">Figs 16</figureCitation>
.
</paragraph>
<paragraph id="8BB9252AFFCEFFB000D756B4FC495CD0" blockId="29.[151,1437,1734,2011]" pageId="29" pageNumber="189">
<emphasis id="B972F938FFCEFFB000D756B4FE085DB9" bold="true" box="[151,387,1734,1759]" pageId="29" pageNumber="189">Modified diagnosis.</emphasis>
Body cuticular setules absent. Pereonite 3 posterolateral margins not produced posteriorly. Pereonite 34 ventral spines absent. Pereonite 4 lateral margins convex in collum region, concave posteriorly; posterolateral margins not produced posteriorly. Pereonite 7 ventral spine prominent. Pleotelson narrowing evenly towards uropod insertions, lateral margins straight, waist present; posterior apex posteriorly convex, length 0.14 pleotelson length. Pereopod III ischium dorsal lobe tapering, recurved with no apical seta. Pereopod V ischium distodorsally without seta. Operculum elongate, distally tapering, apical width subequal or smaller 0.5 operculum width, lateral fringe of setae distinctly separate from apical row of setae.
</paragraph>
</subSubSection>
<subSubSection id="C31C76A1FFCEFFB3008757B1FE2E59AA" lastPageId="30" lastPageNumber="190" pageId="29" pageNumber="189" type="discussion">
<paragraph id="8BB9252AFFCEFFB3008757B1FDF35BB2" blockId="29.[151,1437,1734,2011]" lastBlockId="30.[151,1436,151,716]" lastPageId="30" lastPageNumber="190" pageId="29" pageNumber="189">
<emphasis id="B972F938FFCEFFB0008757B1FEB05CBD" bold="true" box="[199,315,1987,2011]" pageId="29" pageNumber="189">Remarks.</emphasis>
The original illustration of the habitus (Vey &amp; Brix 2009;
<figureCitation id="133D39AFFFCEFFB003B657B0FBB25CBC" box="[1014,1081,1986,2010]" captionStart="FIGURE 1" captionStartId="1.[151,250,1789,1812]" captionTargetBox="[151,1436,555,1765]" captionTargetId="figure@1.[151,1436,555,1765]" captionTargetPageId="1" captionText="FIGURE 1. Type localities of Macrostylidae from the Southern Ocean. 1) Macrostylis antennamagna Riehl &amp; Brandt, 2010. 2) M. setulosa Mezhov, 1992. 3) M. uniformis Riehl &amp; Brandt, 2010. 4) M. vinogradovae Mezhov, 1992. 5) M. cerrita Ve y &amp; Brix, 2009. 6) M. gerdesi (Brandt, 2002). 7) M. sarsi Brandt, 1992; M. obscura (Brandt, 1992). 8) M. matildae n. sp.; M. scotti n. sp. 9) M. roaldi Riehl &amp; Kaiser, 2012." httpUri="https://zenodo.org/record/220613/files/figure.png" pageId="29" pageNumber="189">Fig. 1</figureCitation>
B) shows a conspicuous spine laterally on the pleotelson. This spine was not mentioned in the original description text though. The inspection of the
<typeStatus id="54BD9B88FFCDFFB3008050CEFEA95BB2" box="[192,290,188,212]" pageId="30" pageNumber="190" type="holotype">holotype</typeStatus>
revealed that it does not exist.
</paragraph>
<paragraph id="8BB9252AFFCDFFB3008750ADFAA85AA9" blockId="30.[151,1436,151,716]" pageId="30" pageNumber="190">
The pereopod III ischium dorsal lobe (
<figureCitation id="133D39AFFFCDFFB3023550ADFD3C5B91" box="[629,695,223,247]" captionStart="FIGURE 4" captionStartId="9.[151,250,1688,1711]" captionTargetBox="[151,1436,180,1673]" captionTargetId="figure@9.[151,1436,175,1674]" captionTargetPageId="9" captionText="FIGURE 4. Macrostylis scotti n. sp. A H, paratype non-ovigerous female (ZMH K- 42992). A, dorsal habitus, impricate ornamentation (IO) omitted. B, antennula and antenna, in situ. C, ventral pleotelson, IO omitted. D, lateral habitus, IO omitted, setae simplified. E, ventral pleopod V. F, ventral pleopod IV. G, ventral pleopod III. H, ventral pleopod II (operculum). Scales: A, C, D = 0.5 mm, B = 0.2 mm, E H = 0.3 mm." httpUri="https://zenodo.org/record/220616/files/figure.png" pageId="30" pageNumber="190">Fig. 4</figureCitation>
E) is of remarkable shape and setation. It is tapering, recurved and an apical seta is lacking. A similar ischium is present in
<taxonomicName id="4C065EA9FFCDFFB303585177FBCD5A7A" authority="Mezhov, 1989" authorityName="Mezhov" authorityYear="1989" box="[792,1094,260,284]" class="Malacostraca" family="Macrostylidae" genus="Macrostylis" kingdom="Animalia" order="Isopoda" pageId="30" pageNumber="190" phylum="Arthropoda" rank="species" species="balayevi">
<emphasis id="B972F938FFCDFFB303585177FC165A7A" box="[792,925,260,284]" italics="true" pageId="30" pageNumber="190">M. balayevi</emphasis>
Mezhov, 1989
</taxonomicName>
<taxonomicName id="4C065EA9FFCDFFB3040E5177FA175A7A" authority="Birstein, 1970" authorityName="Birstein" authorityYear="1970" box="[1102,1436,260,284]" class="Malacostraca" family="Macrostylidae" genus="Macrostylis" kingdom="Animalia" order="Isopoda" pageId="30" pageNumber="190" phylum="Arthropoda" rank="species" species="quadratura">
<emphasis id="B972F938FFCDFFB3040E5177FB7F5A7A" box="[1102,1268,260,284]" italics="true" pageId="30" pageNumber="190">M. quadratura</emphasis>
Birstein, 1970
</taxonomicName>
and
<taxonomicName id="4C065EA9FFCDFFB30086515BFE715A59" authority="Mezhov, 1989" authorityName="Mezhov" authorityYear="1989" box="[198,506,295,320]" class="Malacostraca" family="Macrostylidae" genus="Macrostylis" kingdom="Animalia" order="Isopoda" pageId="30" pageNumber="190" phylum="Arthropoda" rank="species" species="tumulosa">
<emphasis id="B972F938FFCDFFB30086515BFED85A26" box="[198,339,296,320]" italics="true" pageId="30" pageNumber="190">M. tumulosa</emphasis>
Mezhov, 1989
</taxonomicName>
where the dorsal lobe is tapering and without apical seta. The recurved apical lobe found in
<taxonomicName id="4C065EA9FFCDFFB300BC513FFEE55A02" box="[252,366,333,356]" class="Malacostraca" family="Macrostylidae" genus="Macrostylis" kingdom="Animalia" order="Isopoda" pageId="30" pageNumber="190" phylum="Arthropoda" rank="species" species="cerrita">
<emphasis id="B972F938FFCDFFB300BC513FFEE55A02" box="[252,366,333,356]" italics="true" pageId="30" pageNumber="190">M. cerrita</emphasis>
</taxonomicName>
, however, might represent a more derived condition. In other species of the genus, the ischium has a convergently similar, hook-shaped appearance. Instead of a recurved dorsal lobe, however, a hook-shaped apical spine-like seta (
<figureCitation id="133D39AFFFCDFFB301D551E6FE635ACA" box="[405,488,404,428]" captionStart="FIGURE 22" captionStartId="35.[151,250,1493,1516]" captionTargetBox="[252,1329,196,1469]" captionTargetId="figure@35.[251,1330,193,1469]" captionTargetPageId="35" captionText="FIGURE 22. Illustrations for identification key to the Macrostylidae of the Southern Ocean. A, pleotelson of Macrostylis cerrita Vey &amp; Brix, 2009, dorsal view, evenly narrowing towards uropodal insertions, lateral margins straight, waist absent. B, pleotelson of M. matildae n. sp., dorsal view, evenly narrowing towards uropodal insertions, lateral margins straight, waist present. C, pleotelson of M. gerdesi (Brandt, 2002), dorsal view, lateral margins straight, subparallel. D, pleotelson of Macrostylis setulosa Mezhov, 1992, lateral margins convex, waist present. E, pleotelson of M. antennamagna Riehl &amp; Brandt, 2010, dorsal view, lateral margins convex, waist present, posterior apex concave. F, ventral spines of M. matildae with pereonites 3 and 4 spines present, pereonite 7 spine small. G, ventral spines of M. roaldi Riehl &amp; Kaiser (2012) with pereonites 3 and 4 spines present, pereonite 7 spine prominent. H, ventral spines of M. scotti n. sp. with pereonites 3 and 4 spines absent, pereonite 7 spine small. I, M. matildae pereonite 3 posterolateral margin spine-like setae absent, pereonite 4 lateral margin curved, posterolateral margin produced posteriorly, rounded, spine-like setae present. J, M. scotti pereonite 3 posterolateral margin spine-like setae absent, pereonite 4 lateral margin convex, posterolateral margin not produced posteriorly, rounded, spine-like setae absent. K, M. roaldi pereonite 3 posterolateral margin spine-like setae present, pereonite 4 lateral margin curved, posterolateral margin produced posteriorly, pointed, spine-like setae present. L, M. matildae operculum, elongate, distally tapering, with lateral fringe of setae distinctly separate from apical row of pappose setae. M, M. scotti operculum, elongate, ovoid, with fluent transition between lateral fringe of setae and apical row of pappose setae. N, M. roaldi operculum, stout, ovoid, with lateral fringe of setae distinctly separate from apical row of pappose setae. O, M. cerrita pereopod III ischium with tapering dorsal apex and 1 spine-like prominent seta. P, M. roaldi pereopod III ischium with triangular dorsal apex and 1 prominent spine-like seta. Q, M. scotti pereopod III ischium with dorsal apex tapering and 2 prominent, spine-like setae." httpUri="https://zenodo.org/record/220634/files/figure.png" pageId="30" pageNumber="190">Fig. 22</figureCitation>
<collectingCountry id="F31165BAFFCDFFB301A851E6FE775ACA" box="[488,508,404,428]" name="Iceland" pageId="30" pageNumber="190">O</collectingCountry>
) is present on the dorsal lobe apex. This is the case e.g. in
<taxonomicName id="4C065EA9FFCDFFB304E051E6FEB15AA9" authority="Mezhov, 1988" authorityName="Mezhov" authorityYear="1988" class="Malacostraca" family="Macrostylidae" genus="Macrostylis" kingdom="Animalia" order="Isopoda" pageId="30" pageNumber="190" phylum="Arthropoda" rank="species" species="carinifera">
<emphasis id="B972F938FFCDFFB304E051E6FA175ACA" box="[1184,1436,404,428]" italics="true" pageId="30" pageNumber="190">Macrostylis carinifera</emphasis>
Mezhov, 1988
</taxonomicName>
,
<taxonomicName id="4C065EA9FFCDFFB3010551CBFD265AA9" authority="Riehl et al., 2012" authorityName="Riehl et al." authorityYear="2012" box="[325,685,439,464]" class="Malacostraca" family="Macrostylidae" genus="Macrostylis" kingdom="Animalia" order="Isopoda" pageId="30" pageNumber="190" phylum="Arthropoda" rank="species" species="dorsaetosa">
<emphasis id="B972F938FFCDFFB3010551CBFE6E5AB6" box="[325,485,440,464]" italics="true" pageId="30" pageNumber="190">M. dorsaetosa</emphasis>
Riehl
<emphasis id="B972F938FFCDFFB3026F51CBFDE55AB6" box="[559,622,440,464]" italics="true" pageId="30" pageNumber="190">et al.,</emphasis>
2012
</taxonomicName>
,
<taxonomicName id="4C065EA9FFCDFFB302FC51CBFB805AA9" authority="Riehl et al. 2012" authorityName="Riehl et al." authorityYear="2012" box="[700,1035,439,464]" class="Malacostraca" family="Macrostylidae" genus="Macrostylis" kingdom="Animalia" order="Isopoda" pageId="30" pageNumber="190" phylum="Arthropoda" rank="species" species="papillata">
<emphasis id="B972F938FFCDFFB302FC51CBFCCD5AB6" box="[700,838,440,464]" italics="true" pageId="30" pageNumber="190">M. papillata</emphasis>
Riehl
<emphasis id="B972F938FFCDFFB303D151CBFC425AB6" box="[913,969,440,464]" italics="true" pageId="30" pageNumber="190">et al.</emphasis>
2012
</taxonomicName>
,
<taxonomicName id="4C065EA9FFCDFFB3045651CBFA945AA9" authority="Sars, 1864" authorityName="Sars" authorityYear="1864" box="[1046,1311,439,464]" class="Malacostraca" family="Macrostylidae" genus="Macrostylis" kingdom="Animalia" order="Isopoda" pageId="30" pageNumber="190" phylum="Arthropoda" rank="species" species="spinifera">
<emphasis id="B972F938FFCDFFB3045651CBFB145AB6" box="[1046,1183,440,464]" italics="true" pageId="30" pageNumber="190">M. spinifera</emphasis>
Sars, 1864
</taxonomicName>
.
</paragraph>
<paragraph id="8BB9252AFFCDFFB3008751AFFEB459E2" blockId="30.[151,1436,151,716]" pageId="30" pageNumber="190">
Vey and Brix (2009) noticed the lateral mandibular setae and interpreted this character as autapomorphy for
<taxonomicName id="4C065EA9FFCDFFB3053D51AFFF68597E" class="Malacostraca" family="Macrostylidae" genus="Macrostylis" kingdom="Animalia" order="Isopoda" pageId="30" pageNumber="190" phylum="Arthropoda" rank="species" species="cerrita">
<emphasis id="B972F938FFCDFFB3053D51AFFF68597E" italics="true" pageId="30" pageNumber="190">M. cerrita</emphasis>
</taxonomicName>
. However, the mandibular lateral setae have been recognized already before, e.g. in
<taxonomicName id="4C065EA9FFCDFFB304DB5273FB73597E" box="[1179,1272,513,536]" class="Malacostraca" family="Macrostylidae" genus="Macrostylis" kingdom="Animalia" order="Isopoda" pageId="30" pageNumber="190" phylum="Arthropoda" rank="species" species="sarsi">
<emphasis id="B972F938FFCDFFB304DB5273FB73597E" box="[1179,1272,513,536]" italics="true" pageId="30" pageNumber="190">M. sarsi</emphasis>
</taxonomicName>
(Brandt 1992;
<figureCitation id="133D39AFFFCDFFB300D75256FF63595A" box="[151,232,548,572]" captionStart="FIGURE 14" captionStartId="22.[151,250,1175,1198]" captionTargetBox="[161,1425,186,1148]" captionTargetId="figure@22.[161,1425,183,1149]" captionTargetPageId="22" captionText="FIGURE 14. Macrostylis matildae n. sp. A H, paratype non-ovigerous female (ZMH K- 43003). A, left mandible, dorsal, molar process damaged. B, left mandible incisor process and lacinia mobilis, medial. C, right mandible incisor process and lacinia mobilis, medial. D, right mandible, dorsal, molar process damaged, lateral seta missing. E, antennula and antenna, in situ. F, maxillula, damaged. G, maxilliped, ventral. H, maxilla. Scales: A H = 0.1 mm." httpUri="https://zenodo.org/record/220626/files/figure.png" pageId="30" pageNumber="190">Fig. 14</figureCitation>
) and
<taxonomicName id="4C065EA9FFCDFFB301695257FC8C595A" authority="Wolff, 1962 (Mezhov 2000)" authorityName="Wolff, 1962 (Mezhov" authorityYear="2000" box="[297,775,548,572]" class="Malacostraca" family="Macrostylidae" genus="Macrostylis" kingdom="Animalia" order="Isopoda" pageId="30" pageNumber="190" phylum="Arthropoda" rank="species" species="magnifica">
<emphasis id="B972F938FFCDFFB301695257FE34595A" box="[297,447,548,572]" italics="true" pageId="30" pageNumber="190">M. magnifica</emphasis>
Wolff, 1962 (Mezhov 2000)
</taxonomicName>
, and are present in all species described since and all
<typeStatus id="54BD9B88FFCDFFB3052C5257FA17595B" box="[1388,1436,549,573]" pageId="30" pageNumber="190">type</typeStatus>
material checked (Riehl, unpublished data). Possibly, those setae are apomorphic for the whole family
<taxonomicName id="4C065EA9FFCDFFB300D7521EFEB059E2" box="[151,315,620,644]" class="Malacostraca" family="Macrostylidae" kingdom="Animalia" order="Isopoda" pageId="30" pageNumber="190" phylum="Arthropoda" rank="family">Macrostylidae</taxonomicName>
.
</paragraph>
<paragraph id="8BB9252AFFCDFFB3008752E2FE2E59AA" blockId="30.[151,1436,151,716]" pageId="30" pageNumber="190">In accordance with the gender agreement stated in Article 31.2 of the ICZN, the species-group name is changed to be feminine.</paragraph>
</subSubSection>
</treatment>
</document>