Oswaldella Stechow 1919
Oswaldella sp. 2 (figure 18) Material examined . 000AZ , one stem ca 47 mm high, almost without hydrocladia (USNM 1003390); 000DW , six stem fragments up to 100 mm long (USNM 1003391; RMNH-Coel. 30236). Description . Stems unbranched and apparently monosiphonic. Stem provided with apophyses alternat...
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ftdatacite:10.5281/zenodo.4654039 2023-05-15T14:00:22+02:00 Oswaldella Stechow 1919 Peña Cantero, A. L. Vervoort, W. 2004 https://dx.doi.org/10.5281/zenodo.4654039 https://zenodo.org/record/4654039 unknown Zenodo http://publication.plazi.org/id/FFBFFF84FF94A75238720600FFFA7605 https://zenodo.org/communities/biosyslit http://publication.plazi.org/id/FFBFFF84FF94A75238720600FFFA7605 https://dx.doi.org/10.5281/zenodo.4654040 https://zenodo.org/communities/biosyslit Open Access info:eu-repo/semantics/openAccess Biodiversity Taxonomy Animalia Cnidaria Hydrozoa Leptothecata Kirchenpaueriidae Oswaldella Text Taxonomic treatment article-journal ScholarlyArticle 2004 ftdatacite https://doi.org/10.5281/zenodo.4654039 https://doi.org/10.5281/zenodo.4654040 2021-11-05T12:55:41Z Oswaldella sp. 2 (figure 18) Material examined . 000AZ , one stem ca 47 mm high, almost without hydrocladia (USNM 1003390); 000DW , six stem fragments up to 100 mm long (USNM 1003391; RMNH-Coel. 30236). Description . Stems unbranched and apparently monosiphonic. Stem provided with apophyses alternately arranged in one plane, forming two longitudinal series. Cauline apophyses directed upwards, forming an angle of ca 45 ° with longitudinal axis of stem and provided with two axillary nematophores (figure 18B), each one emerging from a simple perisarc hole. Stem divided into internodes, each with one apophysis supporting hydrocladia that are usually bifurcated and have two secondary hydrocladia (figure 18A); third-order hydrocladia are also present. Hydrocladial arrangement symmetrical (figure 18A). A distinct node separating cauline apophyses and hydrocladia (figure 18A, B). Hydrocladia homomerously divided into hydrothecate internodes with one hydrotheca and two nematophores (figure 18 C–G): one mesial superior emerging from a perisarc hole behind free adcauline hydrothecal wall, and one mesial inferior nematophore provided with a scale-shaped nematotheca, emerging from a perisarc hole in a slight elevation of internode. Top of distal hydrocladial internodes truncated. Hydrotheca elongate, placed on distal half of internode (figure 18 C–G). Hydrothecal aperture slightly tilted adcaudally, rim circular and even. Adcauline wall with a distinct free portion; abcauline wall almost straight, angle with long axis of internode very acute. Gonothecae absent. Remarks . Oswaldella sp. 2 is allied to O. incognita (cf. table 1), sharing the division of the stem into internodes, the presence of two axillary nematophores on the cauline apophyses and the general shape of the hydrothecae. There are, nevertheless, distinct differences, such as the longer hydrocladial internodes and shorter hydrothecae in Oswaldella sp. 2. Also, in Oswaldella sp. 2 the hydrothecae are placed on the distal half of the internodes, whereas in O. incognita they occur approximately in the middle. Finally, in O. incognita only secondary hydrocladia have been reported whereas in Oswaldella sp. 2 third-order hydrocladia have also been observed. These differences, along with the absence of gonothecae in the present material, prevent us from properly evaluating the systematic position of Oswaldella sp. 2. Ecology and distribution . Oswaldella sp. 2 was found at depths from 18 to 146 m, north of Wilkes Station, at the Budd Coast (Wilkes Land). : Published as part of Peña Cantero, A. L. & Vervoort, W., 2004, Species of Oswaldella Stechow, 1919 (Cnidaria: Hydrozoa: Kirchenpaueriidae) from US Antarctic expeditions, with the description of three new species, pp. 805-861 in Journal of Natural History 38 on page 855 Text Antarc* Antarctic Wilkes Land DataCite Metadata Store (German National Library of Science and Technology) Antarctic Wilkes Land ENVELOPE(120.000,120.000,-69.000,-69.000) Budd Coast ENVELOPE(112.000,112.000,-66.500,-66.500) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Biodiversity Taxonomy Animalia Cnidaria Hydrozoa Leptothecata Kirchenpaueriidae Oswaldella |
spellingShingle |
Biodiversity Taxonomy Animalia Cnidaria Hydrozoa Leptothecata Kirchenpaueriidae Oswaldella Peña Cantero, A. L. Vervoort, W. Oswaldella Stechow 1919 |
topic_facet |
Biodiversity Taxonomy Animalia Cnidaria Hydrozoa Leptothecata Kirchenpaueriidae Oswaldella |
description |
Oswaldella sp. 2 (figure 18) Material examined . 000AZ , one stem ca 47 mm high, almost without hydrocladia (USNM 1003390); 000DW , six stem fragments up to 100 mm long (USNM 1003391; RMNH-Coel. 30236). Description . Stems unbranched and apparently monosiphonic. Stem provided with apophyses alternately arranged in one plane, forming two longitudinal series. Cauline apophyses directed upwards, forming an angle of ca 45 ° with longitudinal axis of stem and provided with two axillary nematophores (figure 18B), each one emerging from a simple perisarc hole. Stem divided into internodes, each with one apophysis supporting hydrocladia that are usually bifurcated and have two secondary hydrocladia (figure 18A); third-order hydrocladia are also present. Hydrocladial arrangement symmetrical (figure 18A). A distinct node separating cauline apophyses and hydrocladia (figure 18A, B). Hydrocladia homomerously divided into hydrothecate internodes with one hydrotheca and two nematophores (figure 18 C–G): one mesial superior emerging from a perisarc hole behind free adcauline hydrothecal wall, and one mesial inferior nematophore provided with a scale-shaped nematotheca, emerging from a perisarc hole in a slight elevation of internode. Top of distal hydrocladial internodes truncated. Hydrotheca elongate, placed on distal half of internode (figure 18 C–G). Hydrothecal aperture slightly tilted adcaudally, rim circular and even. Adcauline wall with a distinct free portion; abcauline wall almost straight, angle with long axis of internode very acute. Gonothecae absent. Remarks . Oswaldella sp. 2 is allied to O. incognita (cf. table 1), sharing the division of the stem into internodes, the presence of two axillary nematophores on the cauline apophyses and the general shape of the hydrothecae. There are, nevertheless, distinct differences, such as the longer hydrocladial internodes and shorter hydrothecae in Oswaldella sp. 2. Also, in Oswaldella sp. 2 the hydrothecae are placed on the distal half of the internodes, whereas in O. incognita they occur approximately in the middle. Finally, in O. incognita only secondary hydrocladia have been reported whereas in Oswaldella sp. 2 third-order hydrocladia have also been observed. These differences, along with the absence of gonothecae in the present material, prevent us from properly evaluating the systematic position of Oswaldella sp. 2. Ecology and distribution . Oswaldella sp. 2 was found at depths from 18 to 146 m, north of Wilkes Station, at the Budd Coast (Wilkes Land). : Published as part of Peña Cantero, A. L. & Vervoort, W., 2004, Species of Oswaldella Stechow, 1919 (Cnidaria: Hydrozoa: Kirchenpaueriidae) from US Antarctic expeditions, with the description of three new species, pp. 805-861 in Journal of Natural History 38 on page 855 |
format |
Text |
author |
Peña Cantero, A. L. Vervoort, W. |
author_facet |
Peña Cantero, A. L. Vervoort, W. |
author_sort |
Peña Cantero, A. L. |
title |
Oswaldella Stechow 1919 |
title_short |
Oswaldella Stechow 1919 |
title_full |
Oswaldella Stechow 1919 |
title_fullStr |
Oswaldella Stechow 1919 |
title_full_unstemmed |
Oswaldella Stechow 1919 |
title_sort |
oswaldella stechow 1919 |
publisher |
Zenodo |
publishDate |
2004 |
url |
https://dx.doi.org/10.5281/zenodo.4654039 https://zenodo.org/record/4654039 |
long_lat |
ENVELOPE(120.000,120.000,-69.000,-69.000) ENVELOPE(112.000,112.000,-66.500,-66.500) |
geographic |
Antarctic Wilkes Land Budd Coast |
geographic_facet |
Antarctic Wilkes Land Budd Coast |
genre |
Antarc* Antarctic Wilkes Land |
genre_facet |
Antarc* Antarctic Wilkes Land |
op_relation |
http://publication.plazi.org/id/FFBFFF84FF94A75238720600FFFA7605 https://zenodo.org/communities/biosyslit http://publication.plazi.org/id/FFBFFF84FF94A75238720600FFFA7605 https://dx.doi.org/10.5281/zenodo.4654040 https://zenodo.org/communities/biosyslit |
op_rights |
Open Access info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5281/zenodo.4654039 https://doi.org/10.5281/zenodo.4654040 |
_version_ |
1766269437793533952 |