Halecium brevithecum Watson 2008
Halecium brevithecum Watson, 2008 (Fig. 4 A–C) Halecium brevithecum Watson, 2008: 168 –169, fig. 4 A–C. Material examined. Holotype, BANZARE Stn 41 , 65° 48 'S 53 ° 16 'E (Enderby Land), 209 m, NMV F 147457, one microslide with a few stem fragments (longest c. 15 mm long). Diagnosis. Large...
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2014
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Online Access: | https://dx.doi.org/10.5281/zenodo.4630874 https://zenodo.org/record/4630874 |
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record_format |
openpolar |
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Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
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unknown |
topic |
Biodiversity Taxonomy Animalia Cnidaria Hydrozoa Leptothecata Haleciidae Halecium Halecium brevithecum |
spellingShingle |
Biodiversity Taxonomy Animalia Cnidaria Hydrozoa Leptothecata Haleciidae Halecium Halecium brevithecum Peña Cantero, Álvaro L. Halecium brevithecum Watson 2008 |
topic_facet |
Biodiversity Taxonomy Animalia Cnidaria Hydrozoa Leptothecata Haleciidae Halecium Halecium brevithecum |
description |
Halecium brevithecum Watson, 2008 (Fig. 4 A–C) Halecium brevithecum Watson, 2008: 168 –169, fig. 4 A–C. Material examined. Holotype, BANZARE Stn 41 , 65° 48 'S 53 ° 16 'E (Enderby Land), 209 m, NMV F 147457, one microslide with a few stem fragments (longest c. 15 mm long). Diagnosis. Large, reddish, polysiphonic, irregularly branched stems. Branches originating either from abcauline side of hydrophore of primary hydrotheca or from inside hydrotheca. Usually, with ahydrothecate intermediate internode after apophysis. First hydrothecate branch internode distinctly longer. Hydrothecae alternately arranged in one plane. Hydrotheca at the end of short, adnate hydrophore. Hydrotheca very slightly widening distally; rim not everted. Adcauline hydrothecal wall adnate to internode. Hydrothecal aperture slightly directed downwards. No secondary hydrothecae present. Gonothecae unknown. Cnidome consisting at least of microbasic euryteles? Description. Thick, reddish stems. “Stem or branch fragments of a presumably larger colony. Stem (branch) fascicled, polysiphonic tubes varying from knotted to parallel. Branching irregular, ultimate branches monosiphonic” (Watson 2008: 169). Stem and branches divided into relatively short and thick internodes by alternately arranged, slightly oblique nodes (Fig. 4 B, C). Branches originating either just below hydrotheca on abcauline side (secondary branch more or less perpendicular to old one) or, more frequently, from inside hydrotheca. Usually, with ahydrothecate intermediate internode following apophysis (Fig. 4 A). First hydrothecate internode of branch distinctly longer (Fig. 4 A). Hydrothecae alternately arranged in approximately one plane. Hydrothecae low (Fig. 4 A–C), placed at end of adnate hydrophores; ratio between adcauline length of hydrophore and diameter at diaphragm 0.7 –1.0. Hydrotheca very slightly widening distally. Adcauline wall much higher than abcauline one, extending upwards on internode (Fig. 4 A–C). Adcauline hydrothecal wall adnate to internode. Hydrothecal aperture slightly directed downwards (Fig. 4 A–C). No secondary hydrothecae present. Measurements (in µm). Hydrothecae : diameter at aperture 215–225, diameter at diaphragm 200–215, height 20–25. Hydrophore : adcauline length 130–200. Internode : length 640–1240, diameter 230–350. Cnidome : microbasic euryteles? (only one type could be observed), c. 12.5 x 5. Remarks. The overall colony form is not yet known. According to Watson (2008: 169) branches “given off from side of a hydrophore; branches beginning with three to five deeply indented transverse nodes, internodes thereafter moderately long”. As stated above, in the holotype, branches more frequently arise from within the hydrothecae. Watson (2008) stated that the adnate hydrophore becomes free just below the hydrotheca. However, in the material examined, the hydrophore is completely adnate. In fact, as stated above, the adcauline hydrothecal wall is also adnate to the internode [as it was also pointed out by Watson (2008)], and, consequently, there is no way for the hydrophore to be partially free. Halecium brevithecum was described from very scarce, infertile material, most mounted into microslides. Because of this, H. brevithecum cannot be completely characterized. The gonothecae are unknown and the cnidome information is practically non-existent (I could observe only one nematocyst). Halecium brevithecum is similar to H. jaederholmi and H. secundum (see below for a discussion about the differences with those species). Ecology and distribution. Halecium brevithecum is known from depths between 209 and 502 m, off Enderby Land and Knox Coast (Watson 2008). : Published as part of Peña Cantero, Álvaro L., 2014, Revision of the Antarctic species of Halecium Oken, 1815 (Cnidaria, Hydrozoa, Haleciidae), pp. 243-280 in Zootaxa 3790 (2) on pages 251-253, DOI: 10.11646/zootaxa.3790.2.2, http://zenodo.org/record/226890 : {"references": ["Watson, J. E. (2008) Hydroids of the BANZARE expeditions, 1929 - 1931: the family Haleciidae (Hydrozoa, Leptothecata) from the Australian Antarctic Territory. Memoirs of the Museum of Victoria, 65, 165 - 178."]} |
format |
Text |
author |
Peña Cantero, Álvaro L. |
author_facet |
Peña Cantero, Álvaro L. |
author_sort |
Peña Cantero, Álvaro L. |
title |
Halecium brevithecum Watson 2008 |
title_short |
Halecium brevithecum Watson 2008 |
title_full |
Halecium brevithecum Watson 2008 |
title_fullStr |
Halecium brevithecum Watson 2008 |
title_full_unstemmed |
Halecium brevithecum Watson 2008 |
title_sort |
halecium brevithecum watson 2008 |
publisher |
Zenodo |
publishDate |
2014 |
url |
https://dx.doi.org/10.5281/zenodo.4630874 https://zenodo.org/record/4630874 |
long_lat |
ENVELOPE(105.000,105.000,-66.500,-66.500) |
geographic |
Antarctic The Antarctic Australian Antarctic Territory Knox Coast |
geographic_facet |
Antarctic The Antarctic Australian Antarctic Territory Knox Coast |
genre |
Antarc* Antarctic Enderby Land |
genre_facet |
Antarc* Antarctic Enderby Land |
op_relation |
http://zenodo.org/record/226890 http://publication.plazi.org/id/C25BFF98294DFF8F2C3E185B3F31FFAC http://treatment.plazi.org/id/039D5126FFA5FFB81B25F8F51FC09306 http://zoobank.org/BE6B199C-6E81-478A-8AC9-EB674B85FA35 https://zenodo.org/communities/biosyslit https://dx.doi.org/10.11646/zootaxa.3790.2.2 http://zenodo.org/record/226890 http://publication.plazi.org/id/C25BFF98294DFF8F2C3E185B3F31FFAC https://dx.doi.org/10.5281/zenodo.226894 https://dx.doi.org/10.5281/zenodo.4630623 http://treatment.plazi.org/id/039D5126FFA5FFB81B25F8F51FC09306 http://zoobank.org/BE6B199C-6E81-478A-8AC9-EB674B85FA35 https://dx.doi.org/10.5281/zenodo.4630875 https://zenodo.org/communities/biosyslit |
op_rights |
Open Access info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5281/zenodo.4630874 https://doi.org/10.11646/zootaxa.3790.2.2 https://doi.org/10.5281/zenodo.226894 https://doi.org/10.5281/zenodo.4630623 https://doi.org/10.5281/zenodo.4630875 |
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spelling |
ftdatacite:10.5281/zenodo.4630874 2023-05-15T14:01:46+02:00 Halecium brevithecum Watson 2008 Peña Cantero, Álvaro L. 2014 https://dx.doi.org/10.5281/zenodo.4630874 https://zenodo.org/record/4630874 unknown Zenodo http://zenodo.org/record/226890 http://publication.plazi.org/id/C25BFF98294DFF8F2C3E185B3F31FFAC http://treatment.plazi.org/id/039D5126FFA5FFB81B25F8F51FC09306 http://zoobank.org/BE6B199C-6E81-478A-8AC9-EB674B85FA35 https://zenodo.org/communities/biosyslit https://dx.doi.org/10.11646/zootaxa.3790.2.2 http://zenodo.org/record/226890 http://publication.plazi.org/id/C25BFF98294DFF8F2C3E185B3F31FFAC https://dx.doi.org/10.5281/zenodo.226894 https://dx.doi.org/10.5281/zenodo.4630623 http://treatment.plazi.org/id/039D5126FFA5FFB81B25F8F51FC09306 http://zoobank.org/BE6B199C-6E81-478A-8AC9-EB674B85FA35 https://dx.doi.org/10.5281/zenodo.4630875 https://zenodo.org/communities/biosyslit Open Access info:eu-repo/semantics/openAccess Biodiversity Taxonomy Animalia Cnidaria Hydrozoa Leptothecata Haleciidae Halecium Halecium brevithecum Taxonomic treatment article-journal Text ScholarlyArticle 2014 ftdatacite https://doi.org/10.5281/zenodo.4630874 https://doi.org/10.11646/zootaxa.3790.2.2 https://doi.org/10.5281/zenodo.226894 https://doi.org/10.5281/zenodo.4630623 https://doi.org/10.5281/zenodo.4630875 2022-02-08T13:29:49Z Halecium brevithecum Watson, 2008 (Fig. 4 A–C) Halecium brevithecum Watson, 2008: 168 –169, fig. 4 A–C. Material examined. Holotype, BANZARE Stn 41 , 65° 48 'S 53 ° 16 'E (Enderby Land), 209 m, NMV F 147457, one microslide with a few stem fragments (longest c. 15 mm long). Diagnosis. Large, reddish, polysiphonic, irregularly branched stems. Branches originating either from abcauline side of hydrophore of primary hydrotheca or from inside hydrotheca. Usually, with ahydrothecate intermediate internode after apophysis. First hydrothecate branch internode distinctly longer. Hydrothecae alternately arranged in one plane. Hydrotheca at the end of short, adnate hydrophore. Hydrotheca very slightly widening distally; rim not everted. Adcauline hydrothecal wall adnate to internode. Hydrothecal aperture slightly directed downwards. No secondary hydrothecae present. Gonothecae unknown. Cnidome consisting at least of microbasic euryteles? Description. Thick, reddish stems. “Stem or branch fragments of a presumably larger colony. Stem (branch) fascicled, polysiphonic tubes varying from knotted to parallel. Branching irregular, ultimate branches monosiphonic” (Watson 2008: 169). Stem and branches divided into relatively short and thick internodes by alternately arranged, slightly oblique nodes (Fig. 4 B, C). Branches originating either just below hydrotheca on abcauline side (secondary branch more or less perpendicular to old one) or, more frequently, from inside hydrotheca. Usually, with ahydrothecate intermediate internode following apophysis (Fig. 4 A). First hydrothecate internode of branch distinctly longer (Fig. 4 A). Hydrothecae alternately arranged in approximately one plane. Hydrothecae low (Fig. 4 A–C), placed at end of adnate hydrophores; ratio between adcauline length of hydrophore and diameter at diaphragm 0.7 –1.0. Hydrotheca very slightly widening distally. Adcauline wall much higher than abcauline one, extending upwards on internode (Fig. 4 A–C). Adcauline hydrothecal wall adnate to internode. Hydrothecal aperture slightly directed downwards (Fig. 4 A–C). No secondary hydrothecae present. Measurements (in µm). Hydrothecae : diameter at aperture 215–225, diameter at diaphragm 200–215, height 20–25. Hydrophore : adcauline length 130–200. Internode : length 640–1240, diameter 230–350. Cnidome : microbasic euryteles? (only one type could be observed), c. 12.5 x 5. Remarks. The overall colony form is not yet known. According to Watson (2008: 169) branches “given off from side of a hydrophore; branches beginning with three to five deeply indented transverse nodes, internodes thereafter moderately long”. As stated above, in the holotype, branches more frequently arise from within the hydrothecae. Watson (2008) stated that the adnate hydrophore becomes free just below the hydrotheca. However, in the material examined, the hydrophore is completely adnate. In fact, as stated above, the adcauline hydrothecal wall is also adnate to the internode [as it was also pointed out by Watson (2008)], and, consequently, there is no way for the hydrophore to be partially free. Halecium brevithecum was described from very scarce, infertile material, most mounted into microslides. Because of this, H. brevithecum cannot be completely characterized. The gonothecae are unknown and the cnidome information is practically non-existent (I could observe only one nematocyst). Halecium brevithecum is similar to H. jaederholmi and H. secundum (see below for a discussion about the differences with those species). Ecology and distribution. Halecium brevithecum is known from depths between 209 and 502 m, off Enderby Land and Knox Coast (Watson 2008). : Published as part of Peña Cantero, Álvaro L., 2014, Revision of the Antarctic species of Halecium Oken, 1815 (Cnidaria, Hydrozoa, Haleciidae), pp. 243-280 in Zootaxa 3790 (2) on pages 251-253, DOI: 10.11646/zootaxa.3790.2.2, http://zenodo.org/record/226890 : {"references": ["Watson, J. E. (2008) Hydroids of the BANZARE expeditions, 1929 - 1931: the family Haleciidae (Hydrozoa, Leptothecata) from the Australian Antarctic Territory. Memoirs of the Museum of Victoria, 65, 165 - 178."]} Text Antarc* Antarctic Enderby Land DataCite Metadata Store (German National Library of Science and Technology) Antarctic The Antarctic Australian Antarctic Territory Knox Coast ENVELOPE(105.000,105.000,-66.500,-66.500) |