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<taxonomicName id="4C114D23FFA4FFD4FF621794FED0FD1C" box="[151,303,654,680]" class="Ascidiacea" family="Didemnidae" kingdom="Animalia" order="Enterogona" pageId="8" pageNumber="9" phylum="Chordata" rank="family">
<emphasis id="B965EAB2FFA4FFD4FF621794FED0FD1C" bold="true" box="[151,303,654,680]" pageId="8" pageNumber="9">Didemnidae</emphasis>
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<paragraph id="8BAE36A0FFA4FFD4FF6217CFFEF7FCBB" blockId="8.[151,558,725,783]" pageId="8" pageNumber="9">
<taxonomicName id="4C114D23FFA4FFD4FF6217CFFDD1FD5B" authority="Sluiter, 1906" authorityName="Sluiter" authorityYear="1906" box="[151,558,725,751]" class="Ascidiacea" family="Didemnidae" genus="Didemnum" kingdom="Animalia" order="Enterogona" pageId="8" pageNumber="9" phylum="Chordata" rank="species" species="biglans">
<emphasis id="B965EAB2FFA4FFD4FF6217CFFE82FD5B" bold="true" box="[151,381,725,751]" italics="true" pageId="8" pageNumber="9">Didemnum biglans</emphasis>
(
<bibRefCitation id="EF804B51FFA4FFD4FE7817CFFDD9FD5B" author="Sluiter" box="[397,550,725,751]" pageId="8" pageNumber="9" refString="Sluiter, C. P. (1906) Tuniciers. In: Expedition antarctique francaise (1903 - 1905). Paris: Masson et Cie, 1 - 48." type="book chapter" year="1906">Sluiter, 1906</bibRefCitation>
)
</taxonomicName>
(
<figureCitation id="132A2A25FFA4FFD4FF6B17EDFF00FCBB" box="[158,255,759,783]" captionStart="FIGURE 2" captionStartId="8.[151,250,1604,1627]" captionTargetBox="[151,1436,1006,1583]" captionTargetId="figure@8.[151,1436,1006,1583]" captionTargetPageId="8" captionText="FIGURE 2. Didemnum biglans. A, larva; B, spicule. Scale bars: A = 0,5 mm; B = 10 µm." httpUri="https://zenodo.org/record/277176/files/figure.png" pageId="8" pageNumber="9">Figure 2</figureCitation>
)
</paragraph>
<paragraph id="8BAE36A0FFA4FFD4FF62165AFCB5FCC0" blockId="8.[151,1436,832,884]" pageId="8" pageNumber="9">
<bibRefCitation id="EF804B51FFA4FFD4FF62165AFEE4FCE2" author="Sluiter" box="[151,283,832,854]" pageId="8" pageNumber="9" refString="Sluiter, C. P. (1906) Tuniciers. In: Expedition antarctique francaise (1903 - 1905). Paris: Masson et Cie, 1 - 48." type="book chapter" year="1906">Sluiter, 1906</bibRefCitation>
: 29 pl. 2 figs 27, 28.
<bibRefCitation id="EF804B51FFA4FFD4FE18165AFD97FCE2" author="Millar" box="[493,616,832,854]" pageId="8" pageNumber="9" refString="Millar, R. H. (1960) Ascidiacea. Discovery Reports, 30, 1 - 160." type="journal article" year="1960">Millar 1960</bibRefCitation>
: 57 fig. 11.
<bibRefCitation id="EF804B51FFA4FFD4FD28165BFCB9FCE2" author="Kott" box="[733,838,832,854]" pageId="8" pageNumber="9" refString="Kott, P. (1969) Antarctic Ascidiacea. Antarctic Research Series, 13, 1 - 239." type="journal article" year="1969">Kott 1969</bibRefCitation>
: 75 and synonymy.
<bibRefCitation id="EF804B51FFA4FFD4FBF8165AFAE9FCE1" author="Monniot" box="[1037,1302,832,854]" pageId="8" pageNumber="9" refString="Monniot, C. &amp; Monniot, F. (1983) Ascidies antarctiques et subantarctiques: Morphologie et Biogeographie. Memoires du Museum National d'Histoire Naturelle, Paris, 125, 1 - 168." type="journal article" year="1983">Monniot &amp; Monniot 1983</bibRefCitation>
: 42 fig. 7
<collectingCountry id="F3067630FFA4FFD4FA86165BFA67FCE2" box="[1395,1432,833,854]" name="South Georgia and the South Sandwich Islands" pageId="8" pageNumber="9">DE</collectingCountry>
, pl.3 H, I and synonymy.
<bibRefCitation id="EF804B51FFA4FFD4FE341645FDB2FCC0" author="Vasseur" box="[449,589,863,884]" pageId="8" pageNumber="9" refString="Vasseur, P. (1974) Invertebres marins des XII e et XVe expeditions antarctiques francaises en Terre Adelie. Tethys, 5, 611 - 628." type="journal article" year="1974">Vasseur 1974</bibRefCitation>
: 617 figs. 4, 5, pl. 2 fig 1
</paragraph>
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Stations (events when several trawling operations per station):
<date id="FFAF1060FFA4FFD4FCA216BBFC37FC0D" box="[855,968,929,953]" pageId="8" pageNumber="9" value="1913-08-02" valueMax="1913-09-05" valueMin="1913-08-02">2-5-8-9-13</date>
A-21-40-54A-65(322).
</paragraph>
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<paragraph id="8BAE36A0FFA4FFD4FF62135EFBE4F9EE" blockId="8.[151,1051,1604,1627]" box="[151,1051,1604,1627]" pageId="8" pageNumber="9">
<emphasis id="B965EAB2FFA4FFD4FF62135EFEECF9EE" bold="true" box="[151,275,1604,1627]" pageId="8" pageNumber="9">FIGURE 2.</emphasis>
<emphasis id="B965EAB2FFA4FFD4FEEC135FFE1FF9EF" box="[281,480,1605,1627]" italics="true" pageId="8" pageNumber="9">
<taxonomicName id="4C114D23FFA4FFD4FEEC135FFE23F9EF" box="[281,476,1605,1627]" class="Ascidiacea" family="Didemnidae" genus="Didemnum" kingdom="Animalia" order="Enterogona" pageId="8" pageNumber="9" phylum="Chordata" rank="species" species="biglans">Didemnum biglans</taxonomicName>
.
</emphasis>
A, larva; B, spicule. Scale bars: A = 0,5mm; B = 10µm.
</paragraph>
</caption>
<paragraph id="8BAE36A0FFA4FFD4FF62139DFDE4F828" blockId="8.[151,1437,1671,2020]" pageId="8" pageNumber="9">
The colonies settle in thin crusts on all kinds of substrates: rocks, pebbles or other invertebrates. The abundance of spicules varies in different parts of a same colony. The wide common cloacal cavity encircles pillars of tunic containing the zooids. The larvae are embedded in the basal layer of the colonies, close to the substrate; they are often missing in the damaged colonies of the CEAMARC cruise. The main characters of the species are a small atrial languet, well expanded lateral thoracic organs, no fixative appendage. The testis, with one or two closely pressed vesicles, is circled with 4 to 5 turns of the sperm duct. The larvae
<quantity id="4CE99B45FFA4FFD4FC861226FBF7F8E0" box="[883,1032,1852,1876]" metricMagnitude="-3" metricUnit="m" metricValue="1.7" metricValueMax="1.8" metricValueMin="1.6" pageId="8" pageNumber="9" unit="mm" value="1.7" valueMax="1.8" valueMin="1.6">1.6 to 1.8mm</quantity>
long have 3 parallel adhesive papillae and 6 pairs of lateral vesicles (
<figureCitation id="132A2A25FFA4FFD4FDEF1245FDA1F8C3" box="[538,606,1887,1911]" captionStart="FIGURE 2" captionStartId="8.[151,250,1604,1627]" captionTargetBox="[151,1436,1006,1583]" captionTargetId="figure@8.[151,1436,1006,1583]" captionTargetPageId="8" captionText="FIGURE 2. Didemnum biglans. A, larva; B, spicule. Scale bars: A = 0,5 mm; B = 10 µm." httpUri="https://zenodo.org/record/277176/files/figure.png" pageId="8" pageNumber="9">Fig. 2</figureCitation>
A). The stellate spicules (40µm) have numerous short rays (
<figureCitation id="132A2A25FFA4FFD4FAF01245FAB5F8C3" box="[1285,1354,1887,1911]" captionStart="FIGURE 2" captionStartId="8.[151,250,1604,1627]" captionTargetBox="[151,1436,1006,1583]" captionTargetId="figure@8.[151,1436,1006,1583]" captionTargetPageId="8" captionText="FIGURE 2. Didemnum biglans. A, larva; B, spicule. Scale bars: A = 0,5 mm; B = 10 µm." httpUri="https://zenodo.org/record/277176/files/figure.png" pageId="8" pageNumber="9">Fig. 2</figureCitation>
B), and many of them are poorly calcified.
</paragraph>
<paragraph id="8BAE36A0FFA4FFD5FF3212B3FEBEFF60" blockId="8.[151,1437,1671,2020]" lastBlockId="9.[151,1436,151,284]" lastPageId="9" lastPageNumber="10" pageId="8" pageNumber="9">Two highly divergent (20.77%) COI sequences were obtained for specimens A2 DID.C 597a (BOLD: ASCAN001-10) and A2 DID.C 598a (BOLD: ASCAN002-10). No close hit in BOLD (best: 82%). Further data would be needed to be able to conclude on the wide molecular divergence observed for this species, as the colonies were damaged.</paragraph>
<paragraph id="8BAE36A0FFA5FFD5FF3215C5FE05FEA8" blockId="9.[151,1436,151,284]" pageId="9" pageNumber="10">
This species is common in Terre Adélie between 200 and
<quantity id="4CE99B45FFA5FFD5FCBA15C5FC69FF43" box="[847,918,223,247]" metricMagnitude="2" metricUnit="m" metricValue="8.0" pageId="9" pageNumber="10" unit="m" value="800.0">800 m</quantity>
deep and was previously recorded in the peri-
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area down to
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.
</paragraph>
<paragraph id="8BAE36A0FFA5FFD5FF621475FEF8FE1E" blockId="9.[151,630,367,426]" pageId="9" pageNumber="10">
<taxonomicName id="4C114D23FFA5FFD5FF621475FD89FE3E" authority="Millar, 1960" authorityName="Millar" authorityYear="1960" box="[151,630,367,394]" class="Ascidiacea" family="Didemnidae" genus="Polysyncraton" kingdom="Animalia" order="Enterogona" pageId="9" pageNumber="10" phylum="Chordata" rank="species" species="trivolutum">
<emphasis id="B965EAB2FFA5FFD5FF621475FE35FE3D" bold="true" box="[151,458,367,393]" italics="true" pageId="9" pageNumber="10">Polysyncraton trivolutum</emphasis>
(
<bibRefCitation id="EF804B51FFA5FFD5FE2C146AFD91FE3E" author="Millar" box="[473,622,368,394]" pageId="9" pageNumber="10" refString="Millar, R. H. (1960) Ascidiacea. Discovery Reports, 30, 1 - 160." type="journal article" year="1960">Millar, 1960</bibRefCitation>
)
</taxonomicName>
(
<figureCitation id="132A2A25FFA5FFD5FF6B1488FF01FE1E" box="[158,254,402,426]" captionStart="FIGURE 3" captionStartId="9.[151,250,1192,1215]" captionTargetBox="[162,1416,666,1150]" captionTargetId="figure@9.[151,1436,666,1171]" captionTargetPageId="9" captionText="FIGURE 3. Polysyncraton trivolutum. A, larva, scale bar = 1 mm; B, colonies." httpUri="https://zenodo.org/record/277177/files/figure.png" pageId="9" pageNumber="10">Figure 3</figureCitation>
)
</paragraph>
<paragraph id="8BAE36A0FFA5FFD5FF6214C0FE03FDBB" blockId="9.[151,1436,474,527]" pageId="9" pageNumber="10">
<treatmentCitationGroup id="AB01118EFFA5FFD5FF6214C0FE03FDBB" pageId="9" pageNumber="10">
<taxonomicName id="4C114D23FFA5FFD5FF6214C0FDDDFE44" authority="Millar, 1960: 58" authorityName="Millar" authorityPageNumber="58" authorityYear="1960" box="[151,546,474,496]" class="Ascidiacea" family="Didemnidae" genus="Didemnum" kingdom="Animalia" order="Enterogona" pageId="9" pageNumber="10" phylum="Chordata" rank="species" species="trivolutum">
<emphasis id="B965EAB2FFA5FFD5FF6214C0FE89FE44" box="[151,374,474,496]" italics="true" pageId="9" pageNumber="10">Didemnum trivolutum</emphasis>
<treatmentCitation id="0AB010B1FFA5FFD5FE8914C0FDDDFE44" author="Millar" box="[380,546,474,496]" page="58" pageId="9" pageNumber="10" year="1960">
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: 58
</treatmentCitation>
</taxonomicName>
.
<taxonomicName id="4C114D23FFA5FFD5FDD914C0FB97FE44" authority="Monniot &amp; Monniot 1983: 43" authorityName="Monniot &amp; Monniot" authorityPageNumber="43" authorityYear="1983" box="[556,1128,474,496]" class="Ascidiacea" family="Didemnidae" genus="Polysyncraton" kingdom="Animalia" order="Enterogona" pageId="9" pageNumber="10" phylum="Chordata" rank="species" species="trivolutum">
<emphasis id="B965EAB2FFA5FFD5FDD914C0FCD2FE44" box="[556,813,474,496]" italics="true" pageId="9" pageNumber="10">Polysyncraton trivolutum</emphasis>
:
<treatmentCitation id="0AB010B1FFA5FFD5FCCE14C0FB97FE44" author="Monniot" box="[827,1128,474,496]" page="43" pageId="9" pageNumber="10" year="1983">
<bibRefCitation id="EF804B51FFA5FFD5FCCE14C0FBBAFE44" author="Monniot" box="[827,1093,474,496]" pageId="9" pageNumber="10" refString="Monniot, C. &amp; Monniot, F. (1983) Ascidies antarctiques et subantarctiques: Morphologie et Biogeographie. Memoires du Museum National d'Histoire Naturelle, Paris, 125, 1 - 168." type="journal article" year="1983">Monniot &amp; Monniot 1983</bibRefCitation>
: 43
</treatmentCitation>
</taxonomicName>
fig. 8AH, pl. 4AD and synonymy.
<treatmentCitation id="0AB010B1FFA5FFD5FEED14E3FE08FDBB" author="Tatian" box="[280,503,505,527]" page="209" pageId="9" pageNumber="10" year="2005">
<bibRefCitation id="EF804B51FFA5FFD5FEED14E3FE3AFDBB" author="Tatian" box="[280,453,505,527]" pageId="9" pageNumber="10" refString="Tatian, M., Antacli, J. C. &amp; Sahade, R. (2005) Ascidians (Tunicata, Ascidiacea): species distribution along the Scotia Arc. Scientia Marina, 69 (2), 205 - 214." type="journal article" year="2005">Tatian et al 2005</bibRefCitation>
: 209
</treatmentCitation>
.
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</paragraph>
<paragraph id="8BAE36A0FFA5FFD5FF621726FB4CFDE0" blockId="9.[151,1203,572,596]" box="[151,1203,572,596]" pageId="9" pageNumber="10">
Stations (events when several trawling operations per station):
<date id="FFAF1060FFA5FFD5FCA21726FC4AFDE0" box="[855,949,572,596]" pageId="9" pageNumber="10" value="2010-03-02" valueMax="2010-08-02" valueMin="2010-03-02">2-3-8-10</date>
-21-27(45)-27(46)-79.
</paragraph>
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<paragraph id="8BAE36A0FFA5FFD5FF6211B2FC4AFB0B" blockId="9.[151,949,1192,1215]" box="[151,949,1192,1215]" pageId="9" pageNumber="10">
<emphasis id="B965EAB2FFA5FFD5FF6211B2FEEDFB0A" bold="true" box="[151,274,1192,1215]" pageId="9" pageNumber="10">FIGURE 3.</emphasis>
<taxonomicName id="4C114D23FFA5FFD5FEEC11B3FDE4FB0B" box="[281,539,1193,1215]" class="Ascidiacea" family="Didemnidae" genus="Polysyncraton" kingdom="Animalia" order="Enterogona" pageId="9" pageNumber="10" phylum="Chordata" rank="species" species="trivolutum">
<emphasis id="B965EAB2FFA5FFD5FEEC11B3FDE4FB0B" box="[281,539,1193,1215]" italics="true" pageId="9" pageNumber="10">Polysyncraton trivolutum</emphasis>
</taxonomicName>
. A, larva, scale bar = 1mm; B, colonies.
</paragraph>
</caption>
<paragraph id="8BAE36A0FFA5FFD5FF6211F1FEEFF9F3" blockId="9.[151,1437,1259,1716]" pageId="9" pageNumber="10">
The colonies are arranged in thick cushions (
<figureCitation id="132A2A25FFA5FFD5FD7A11F1FD2EFAB7" box="[655,721,1259,1283]" captionStart="FIGURE 3" captionStartId="9.[151,250,1192,1215]" captionTargetBox="[162,1416,666,1150]" captionTargetId="figure@9.[151,1436,666,1171]" captionTargetPageId="9" captionText="FIGURE 3. Polysyncraton trivolutum. A, larva, scale bar = 1 mm; B, colonies." httpUri="https://zenodo.org/record/277177/files/figure.png" pageId="9" pageNumber="10">Fig. 3</figureCitation>
B) with a convoluted surface and appear light brown in fixative liquids. They settle on diverse substrates, mainly on sponges. The oral openings appear in a meandriform design. The very resistant tunic contains few spicules, present only in the surface layer of the colony. The common cloacal cavity is spacious around the zooid thoraces and penetrates into the abdominal layer. The oral siphon has 6 short pointed lobes. The atrial aperture is wide with a small upper languet. The thorax is smaller than the abdomen. Ten stigmata were counted in the two first branchial half-rows. There is no muscular appendage. The testis has generally 3 or 4 lobes enclosed in 6 to 7 turns of the sperm duct, but sometimes an additional testis with its sperm duct can be found in the abdomen. The larvae (
<figureCitation id="132A2A25FFA5FFD5FD9810FDFD50FA4B" box="[621,687,1511,1535]" captionStart="FIGURE 3" captionStartId="9.[151,250,1192,1215]" captionTargetBox="[162,1416,666,1150]" captionTargetId="figure@9.[151,1436,666,1171]" captionTargetPageId="9" captionText="FIGURE 3. Polysyncraton trivolutum. A, larva, scale bar = 1 mm; B, colonies." httpUri="https://zenodo.org/record/277177/files/figure.png" pageId="9" pageNumber="10">Fig. 3</figureCitation>
A)
<quantity id="4CE99B45FFA5FFD5FD2110FDFC97FA4B" box="[724,872,1511,1535]" metricMagnitude="-3" metricUnit="m" metricValue="1.85" metricValueMax="2.1" metricValueMin="1.6" pageId="9" pageNumber="10" unit="mm" value="1.85" valueMax="2.1" valueMin="1.6">1.6 to 2.1mm</quantity>
have 3 slender divergent adhesive papillae arising from a circle of numerous elongated vesicles. Ocellus and otolith are present. The spicules are burr-like with rays in needles.
</paragraph>
<paragraph id="8BAE36A0FFA5FFD5FF321349FB54F93B" blockId="9.[151,1437,1259,1716]" pageId="9" pageNumber="10">Sequences were obtained for specimens A2 POL 122a (BOLD: ASCAN004-10) and A2 POL 120a (BOLD: ASCAN003-10) with 0.56% divergence between the two. No close hit in BOLD (best: 82%).</paragraph>
<paragraph id="8BAE36A0FFA5FFD5FF321386FAA1F907" blockId="9.[151,1437,1259,1716]" box="[199,1374,1691,1716]" pageId="9" pageNumber="10">
<taxonomicName id="4C114D23FFA5FFD5FF321386FE1AF900" box="[199,485,1692,1716]" class="Ascidiacea" family="Didemnidae" genus="Polysyncraton" kingdom="Animalia" order="Enterogona" pageId="9" pageNumber="10" phylum="Chordata" rank="species" species="trivolutum">
<emphasis id="B965EAB2FFA5FFD5FF321386FE1AF900" box="[199,485,1692,1716]" italics="true" pageId="9" pageNumber="10">Polysyncraton trivolutum</emphasis>
</taxonomicName>
is eurybathe and widely distributed in the
<collectingCountry id="F3067630FFA5FFD5FC341381FBD6F907" box="[961,1065,1691,1715]" name="Antarctica" pageId="9" pageNumber="10">Antarctic</collectingCountry>
and Sub-Antarctic regions.
</paragraph>
</subSubSection>
</treatment>
</document>