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, Fabiana Lía, Daponte, María Cristina, Esnal, Graciela Beatriz
Publicado:	2003
Materias:	Intraspecific variability Southern Ocean Tunicata classification intraspecific variation morphology taxonomy Bellingshausen Sea South Georgia Appendicularia (class) Chorda Oikopleura Urochordata
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09541020_v15_n4_p476_Capitanio http://hdl.handle.net/20.500.12110/paper_09541020_v15_n4_p476_Capitanio
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_09541020_v15_n4_p476_Capitanio
record_format	dspace
spelling	paper:paper_09541020_v15_n4_p476_Capitanio2023-06-08T15:55:43Z The classification of Antarctic appendicularians: The Oikopleura gaussica group Capitanio, Fabiana Lía Daponte, María Cristina Esnal, Graciela Beatriz 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. 2003 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09541020_v15_n4_p476_Capitanio 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, Fabiana Lía Daponte, María Cristina Esnal, Graciela Beatriz 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.
author	Capitanio, Fabiana Lía Daponte, María Cristina Esnal, Graciela Beatriz
author_facet	Capitanio, Fabiana Lía Daponte, María Cristina Esnal, Graciela Beatriz
author_sort	Capitanio, Fabiana Lía
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
publishDate	2003
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09541020_v15_n4_p476_Capitanio http://hdl.handle.net/20.500.12110/paper_09541020_v15_n4_p476_Capitanio
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The classification of Antarctic appendicularians: The Oikopleura gaussica group

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