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<mods:title id="D0FDA2A2E0D499B629BBB051E78B16D1">Notes on some sertulariid hydroids (Cnidaria: Hydrozoa) from the tropical western Pacific, with descriptions of nine new species</mods:title>
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<treatment id="3D2E87D5F802FF8AFDB8FD93FBD8F9CD" ID-DOI="http://doi.org/10.5281/zenodo.3853799" ID-GBIF-Taxon="164252496" ID-Zenodo-Dep="3853799" LSID="urn:lsid:plazi:treatment:3D2E87D5F802FF8AFDB8FD93FBD8F9CD" httpUri="http://treatment.plazi.org/id/3D2E87D5F802FF8AFDB8FD93FBD8F9CD" lastPageNumber="13" pageId="12" pageNumber="13">
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<taxonomicName id="72874D40F802FF8AFDB8FD93FC66FD0D" authority="Vervoort, 1993" authorityName="Vervoort" authorityYear="1993" box="[601,987,620,647]" class="Hydrozoa" family="Sertulariidae" genus="Gonaxia" kingdom="Animalia" order="Leptothecata" pageId="12" pageNumber="13" phylum="Cnidaria" rank="species" species="elegans">
<emphasis id="87F3EAD1F802FF8AFDB8FD93FC9EFD0D" bold="true" box="[601,803,620,647]" italics="true" pageId="12" pageNumber="13">Gonaxia elegans</emphasis>
<bibRefCitation id="D1164B32F802FF8AFCCAFD93FC66FD0D" author="Vervoort W." box="[811,987,621,647]" pageId="12" pageNumber="13" pagination="89 - 298" refId="ref27098" refString="Vervoort W. 1993. Cnidaria, Hydrozoa, Hydroida: Hydroids from the western Pacific (Philippines, Indonesia and New Caledonia) I. Sertulariidae (Part 1). In: Crosnier A. (ed.) Resultats des Campagnes MUSORSTOM 11. Memoires du Museum national d'Histoire naturelle 158: 89 - 298, Museum national d'Histoire naturelle, Paris." type="journal article" year="1993">Vervoort, 1993</bibRefCitation>
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<subSubSection id="FD9D6548F802FF8AFD3DFD6EFCE5FD20" box="[732,856,656,682]" pageId="12" pageNumber="13" type="description">
<paragraph id="B53836C3F802FF8AFD3DFD6EFCE5FD20" blockId="12.[601,987,620,682]" box="[732,856,656,682]" pageId="12" pageNumber="13">
<figureCitation id="2DBC2A46F802FF8AFD3DFD6EFC9DFD20" box="[732,800,656,682]" captionStart="Fig" captionStartId="11.[189,232,1754,1780]" captionTargetBox="[221,1367,261,1726]" captionTargetId="figure@11.[221,1370,261,1726]" captionTargetPageId="11" captionText="Fig. 4. ― A. Gonaxia crassicaulis Vervoort, 1993 (MUSORSTOM 4, Stn. DW205), portion of cladium. ― BD. Gonaxia elegans Vervoort, 1993 (BATHUS 3, Stn. DW809). B. Portion of stem and basal part of a cladium. C. Two consecutive internodes with their hydrothecae. D. Portion of stem with male gonothecae. ― EF. Gonaxia cf. errans Vervoort, 1993 (BATHUS 2, Stn. CP737). E. Distalmost portion of stem with basal parts of four hydrocladia. F. Two consecutive cladial internodes with their hydrothecae. ― GJ. Gonaxia plumularioides sp. nov. (BIOCAL, Stn. CP34). G. Distalmost part of a stem, showing the structure of internodes. H. Two consecutive cladial internodes with their hydrothecae. I. Stem hydrotheca. J. Axillar hydrotheca. Scale bars: AB, DE, G = 1 mm; C, F, HJ = 300 µm." figureDoi="http://doi.org/10.5281/zenodo.3840203" httpUri="https://zenodo.org/record/3840203/files/figure.png" pageId="12" pageNumber="13">Fig. 4</figureCitation>
BD
</paragraph>
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<paragraph id="B53836C3F802FF8AFF5CFD2CFCD7FD66" blockId="12.[189,874,721,748]" box="[189,874,721,748]" pageId="12" pageNumber="13">
<treatmentCitationGroup id="959711EDF802FF8AFF5CFD2CFCD7FD66" box="[189,874,721,748]" pageId="12" pageNumber="13">
<treatmentCitation id="342610D2F802FF8AFF5CFD2CFDCAFD66" author="Vervoort W." box="[189,631,721,748]" page="153" pageId="12" pageNumber="13" year="1993">
<taxonomicName id="72874D40F802FF8AFF5CFD2CFDCAFD66" authority="Vervoort" authorityName="Vervoort" authorityPageNumber="153" authorityYear="1993" box="[189,631,721,748]" class="Hydrozoa" family="Sertulariidae" genus="Gonaxia" kingdom="Animalia" order="Leptothecata" pageId="12" pageNumber="13" phylum="Cnidaria" rank="species" species="elegans">
<emphasis id="87F3EAD1F802FF8AFF5CFD2CFE3EFD61" box="[189,387,721,748]" italics="true" pageId="12" pageNumber="13">Gonaxia elegans</emphasis>
<bibRefCitation id="D1164B32F802FF8AFE6BFD2CFDCAFD66" author="Vervoort W." box="[394,631,721,748]" pageId="12" pageNumber="13" pagination="89 - 298" refId="ref27098" refString="Vervoort W. 1993. Cnidaria, Hydrozoa, Hydroida: Hydroids from the western Pacific (Philippines, Indonesia and New Caledonia) I. Sertulariidae (Part 1). In: Crosnier A. (ed.) Resultats des Campagnes MUSORSTOM 11. Memoires du Museum national d'Histoire naturelle 158: 89 - 298, Museum national d'Histoire naturelle, Paris." type="journal article" year="1993">Vervoort, 1993: 153</bibRefCitation>
</taxonomicName>
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, figs 19c, 21bc, 22.
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</paragraph>
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<subSubSection id="FD9D6548F802FF8AFF5CFCEDFBDDFC29" pageId="12" pageNumber="13" type="materials_examined">
<paragraph id="B53836C3F802FF8AFF5CFCEDFE17FCA7" blockId="12.[189,426,787,813]" box="[189,426,787,813]" pageId="12" pageNumber="13">
<heading id="EE7081AFF802FF8AFF5CFCEDFE17FCA7" bold="true" box="[189,426,787,813]" fontSize="11" level="3" pageId="12" pageNumber="13" reason="3">
<emphasis id="87F3EAD1F802FF8AFF5CFCEDFE17FCA7" bold="true" box="[189,426,787,813]" pageId="12" pageNumber="13">Material examined</emphasis>
</heading>
</paragraph>
<paragraph id="B53836C3F802FF8AFF5CFCBCFBDDFC29" blockId="12.[189,1398,833,931]" pageId="12" pageNumber="13">
<collectionCode id="D396AE06F802FF8AFF5CFCBCFE92FCD6" box="[189,303,834,860]" pageId="12" pageNumber="13">BATHUS</collectionCode>
3: Stn. DW809, a
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high colony devoid of hydrorhiza and bearing female gonothecae, as well as an originally
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high colony (now broken into two parts) bearing male gonothecae and several broken cladia originating from both colonies (MNHN-IK-
<date id="C1391003F802FF8AFC27FC76FBBEFC29" box="[966,1027,904,931]" pageId="12" pageNumber="13" value="2012">2012</date>
-16533).
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<subSubSection id="FD9D6548F802FF8AFF5CFC37FBD8F9CD" pageId="12" pageNumber="13" type="discussion">
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<emphasis id="87F3EAD1F802FF8AFF5CFC37FE92FC69" bold="true" box="[189,303,969,995]" pageId="12" pageNumber="13">Remarks</emphasis>
</heading>
</paragraph>
<paragraph id="B53836C3F802FF8AFF5CFC06FB70FB6F" blockId="12.[189,1399,1016,1254]" pageId="12" pageNumber="13">
This species is immediately recognizable through the characteristic position and shape of its hydrothecae. The
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high colony is evidently male when compared to the smaller one, which bears gonothecae possessing much wider apertures. Only the female gonothecae were described by
<bibRefCitation id="D1164B32F802FF8AFB64FBC1FAFFFBD2" author="Vervoort W." box="[1157,1346,1086,1113]" pageId="12" pageNumber="13" pagination="89 - 298" refId="ref27098" refString="Vervoort W. 1993. Cnidaria, Hydrozoa, Hydroida: Hydroids from the western Pacific (Philippines, Indonesia and New Caledonia) I. Sertulariidae (Part 1). In: Crosnier A. (ed.) Resultats des Campagnes MUSORSTOM 11. Memoires du Museum national d'Histoire naturelle 158: 89 - 298, Museum national d'Histoire naturelle, Paris." type="journal article" year="1993">
Vervoort (
<date id="C1391003F802FF8AFB1DFBC0FA84FBD2" box="[1276,1337,1086,1112]" pageId="12" pageNumber="13" value="1993">1993</date>
)
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but, upon a careful inspection of the present material, it should be stated that they do not arise from the accessory tubes on the hydrocaulus, but from the main tube itself, as this is indisputably seen in the monosiphonic part of the stem. In addition, in this colony at least, nearly all accessory tubes are found on the “dorsal” aspect of the stem, while the row of gonothecae is situated on its “front”.
</paragraph>
<paragraph id="B53836C3F802FF8AFF5CFAF2FC29FA5C" blockId="12.[189,1399,1292,1495]" pageId="12" pageNumber="13">
The male gonothecae, observed here for the first time, are similar in shape to the female ones, and also arise from the main tube of the stem, but in both the frontal and dorsal aspects of the colony. They are given off closely and in a single row (
<figureCitation id="2DBC2A46F802FF8AFD68FAADFD54FAE7" box="[649,745,1363,1389]" captionStart="Fig" captionStartId="11.[189,232,1754,1780]" captionTargetBox="[221,1367,261,1726]" captionTargetId="figure@11.[221,1370,261,1726]" captionTargetPageId="11" captionText="Fig. 4. ― A. Gonaxia crassicaulis Vervoort, 1993 (MUSORSTOM 4, Stn. DW205), portion of cladium. ― BD. Gonaxia elegans Vervoort, 1993 (BATHUS 3, Stn. DW809). B. Portion of stem and basal part of a cladium. C. Two consecutive internodes with their hydrothecae. D. Portion of stem with male gonothecae. ― EF. Gonaxia cf. errans Vervoort, 1993 (BATHUS 2, Stn. CP737). E. Distalmost portion of stem with basal parts of four hydrocladia. F. Two consecutive cladial internodes with their hydrothecae. ― GJ. Gonaxia plumularioides sp. nov. (BIOCAL, Stn. CP34). G. Distalmost part of a stem, showing the structure of internodes. H. Two consecutive cladial internodes with their hydrothecae. I. Stem hydrotheca. J. Axillar hydrotheca. Scale bars: AB, DE, G = 1 mm; C, F, HJ = 300 µm." figureDoi="http://doi.org/10.5281/zenodo.3840203" httpUri="https://zenodo.org/record/3840203/files/figure.png" pageId="12" pageNumber="13">Fig. 4D</figureCitation>
), are about half adnate, and their free parts are shifted alternately left and right; their bases are obscured by the numerous accessory tubes running up the stem. They are long (
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), tubular (
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wide), with small, circular apertures (
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wide) mounted on the summit of a conical, distal neck region.
</paragraph>
<paragraph id="B53836C3F802FF8AFF5CFA00FDBFF992" blockId="12.[189,514,1534,1560]" box="[189,514,1534,1560]" pageId="12" pageNumber="13">
<heading id="EE7081AFF802FF8AFF5CFA00FDBFF992" bold="true" box="[189,514,1534,1560]" fontSize="11" level="3" pageId="12" pageNumber="13" reason="3">
<emphasis id="87F3EAD1F802FF8AFF5CFA00FDBFF992" bold="true" box="[189,514,1534,1560]" pageId="12" pageNumber="13">Geographical distribution</emphasis>
</heading>
</paragraph>
<paragraph id="B53836C3F802FF8AFF5CF9D3FBD8F9CD" blockId="12.[189,1125,1580,1607]" box="[189,1125,1580,1607]" pageId="12" pageNumber="13">
<collectingCountry id="CD907653F802FF8AFF5CF9D3FECEF9CC" box="[189,371,1580,1607]" name="New Caledonia" pageId="12" pageNumber="13">New Caledonia</collectingCountry>
(
<bibRefCitation id="D1164B32F802FF8AFE63F9D3FD8DF9CD" author="Vervoort W." box="[386,560,1581,1607]" pageId="12" pageNumber="13" pagination="89 - 298" refId="ref27098" refString="Vervoort W. 1993. Cnidaria, Hydrozoa, Hydroida: Hydroids from the western Pacific (Philippines, Indonesia and New Caledonia) I. Sertulariidae (Part 1). In: Crosnier A. (ed.) Resultats des Campagnes MUSORSTOM 11. Memoires du Museum national d'Histoire naturelle 158: 89 - 298, Museum national d'Histoire naturelle, Paris." type="journal article" year="1993">
Vervoort
<date id="C1391003F802FF8AFE13F9D3FD8DF9CD" box="[498,560,1581,1607]" pageId="12" pageNumber="13" value="1993">1993</date>
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; present study), Norfolk Ridge (
<bibRefCitation id="D1164B32F802FF8AFC48F9D3FBE5F9CD" author="Vervoort W." box="[937,1112,1581,1607]" pageId="12" pageNumber="13" pagination="89 - 298" refId="ref27098" refString="Vervoort W. 1993. Cnidaria, Hydrozoa, Hydroida: Hydroids from the western Pacific (Philippines, Indonesia and New Caledonia) I. Sertulariidae (Part 1). In: Crosnier A. (ed.) Resultats des Campagnes MUSORSTOM 11. Memoires du Museum national d'Histoire naturelle 158: 89 - 298, Museum national d'Histoire naturelle, Paris." type="journal article" year="1993">
Vervoort
<date id="C1391003F802FF8AFBF8F9D3FBE5F9CD" box="[1049,1112,1581,1607]" pageId="12" pageNumber="13" value="1993">1993</date>
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).
</paragraph>
</subSubSection>
</treatment>
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