The classification of Antarctic appendicularians: The Oikopleura gaussica group

The validity of the Antarctic species of the "Oikopleura gaussica group" (O. gaussica, O. valdiviae, O. drygalskii, and O. weddelli) is discussed. The characteristics of new material from South Georgia and the Bellingshausen Sea are compared with the original descriptions. We examined 495...

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Autores principales: Capitanio, F.L., Daponte, M.C., Esnal, G.B.
Formato: JOUR
Materias:
Intraspecific variability
Southern Ocean
Tunicata
classification
intraspecific variation
morphology
taxonomy
Bellingshausen Sea
South Georgia
Appendicularia (class)
Chorda
Oikopleura
Urochordata
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_09541020_v15_n4_p476_Capitanio
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_09541020_v15_n4_p476_Capitanio2023-10-03T15:51:36Z The classification of Antarctic appendicularians: The Oikopleura gaussica group Capitanio, F.L. Daponte, M.C. Esnal, G.B. Intraspecific variability Southern Ocean Tunicata classification intraspecific variation morphology taxonomy Bellingshausen Sea South Georgia Southern Ocean Appendicularia (class) Chorda Oikopleura Urochordata The validity of the Antarctic species of the "Oikopleura gaussica group" (O. gaussica, O. valdiviae, O. drygalskii, and O. weddelli) is discussed. The characteristics of new material from South Georgia and the Bellingshausen Sea are compared with the original descriptions. We examined 495 specimens at different stages of maturity and concluded that the characters used to differentiate these species of Oikopleura have not enough weight to justify their separation. The morphological variations found were ascribed either to intraspecific variability and/or to the different degree of maturity of the specimens examined of a single species, Oikopleura gaussica. The main taxonomic characters for the identification of this species are: the particular way in which the flat triangular gonads surround the intestinal ball like a sheath, the equal size of the two lobes of the stomach, the oesophagus entering the postero-dorsal edge of the rounded left lobe of the stomach, the presence of oval and some times lobate oral glands, and the variable number of subchordal cells (4 to 14) arranged in a single row on the right (ventral) side of the chorda. Fil:Capitanio, F.L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Daponte, M.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Esnal, G.B. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_09541020_v15_n4_p476_Capitanio
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Intraspecific variability
Southern Ocean
Tunicata
classification
intraspecific variation
morphology
taxonomy
Bellingshausen Sea
South Georgia
Southern Ocean
Appendicularia (class)
Chorda
Oikopleura
Urochordata
spellingShingle Intraspecific variability
Southern Ocean
Tunicata
classification
intraspecific variation
morphology
taxonomy
Bellingshausen Sea
South Georgia
Southern Ocean
Appendicularia (class)
Chorda
Oikopleura
Urochordata
Capitanio, F.L.
Daponte, M.C.
Esnal, G.B.
The classification of Antarctic appendicularians: The Oikopleura gaussica group
topic_facet Intraspecific variability
Southern Ocean
Tunicata
classification
intraspecific variation
morphology
taxonomy
Bellingshausen Sea
South Georgia
Southern Ocean
Appendicularia (class)
Chorda
Oikopleura
Urochordata
description The validity of the Antarctic species of the "Oikopleura gaussica group" (O. gaussica, O. valdiviae, O. drygalskii, and O. weddelli) is discussed. The characteristics of new material from South Georgia and the Bellingshausen Sea are compared with the original descriptions. We examined 495 specimens at different stages of maturity and concluded that the characters used to differentiate these species of Oikopleura have not enough weight to justify their separation. The morphological variations found were ascribed either to intraspecific variability and/or to the different degree of maturity of the specimens examined of a single species, Oikopleura gaussica. The main taxonomic characters for the identification of this species are: the particular way in which the flat triangular gonads surround the intestinal ball like a sheath, the equal size of the two lobes of the stomach, the oesophagus entering the postero-dorsal edge of the rounded left lobe of the stomach, the presence of oval and some times lobate oral glands, and the variable number of subchordal cells (4 to 14) arranged in a single row on the right (ventral) side of the chorda.
format JOUR
author Capitanio, F.L.
Daponte, M.C.
Esnal, G.B.
author_facet Capitanio, F.L.
Daponte, M.C.
Esnal, G.B.
author_sort Capitanio, F.L.
title The classification of Antarctic appendicularians: The Oikopleura gaussica group
title_short The classification of Antarctic appendicularians: The Oikopleura gaussica group
title_full The classification of Antarctic appendicularians: The Oikopleura gaussica group
title_fullStr The classification of Antarctic appendicularians: The Oikopleura gaussica group
title_full_unstemmed The classification of Antarctic appendicularians: The Oikopleura gaussica group
title_sort classification of antarctic appendicularians: the oikopleura gaussica group
url http://hdl.handle.net/20.500.12110/paper_09541020_v15_n4_p476_Capitanio
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