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Abstract:

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.

Registro:

Documento: Artículo
Título:The classification of Antarctic appendicularians: The Oikopleura gaussica group
Autor:Capitanio, F.L.; Daponte, M.C.; Esnal, G.B.
Filiación:Depto. de Ciencias Biológicas, Fac. de Ciencias Exactas y Naturales, CONICET, C1428EHA Buenos Aires, Argentina
Palabras clave:Intraspecific variability; Southern Ocean; Tunicata; classification; intraspecific variation; morphology; taxonomy; Bellingshausen Sea; South Georgia; Southern Ocean; Appendicularia (class); Chorda; Oikopleura; Urochordata
Año:2003
Volumen:15
Número:4
Página de inicio:476
Página de fin:482
DOI: http://dx.doi.org/10.1017/S0954102003001585
Título revista:Antarctic Science
Título revista abreviado:Antarct. Sci.
ISSN:09541020
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09541020_v15_n4_p476_Capitanio

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Citas:

---------- APA ----------
Capitanio, F.L., Daponte, M.C. & Esnal, G.B. (2003) . The classification of Antarctic appendicularians: The Oikopleura gaussica group. Antarctic Science, 15(4), 476-482.
http://dx.doi.org/10.1017/S0954102003001585
---------- CHICAGO ----------
Capitanio, F.L., Daponte, M.C., Esnal, G.B. "The classification of Antarctic appendicularians: The Oikopleura gaussica group" . Antarctic Science 15, no. 4 (2003) : 476-482.
http://dx.doi.org/10.1017/S0954102003001585
---------- MLA ----------
Capitanio, F.L., Daponte, M.C., Esnal, G.B. "The classification of Antarctic appendicularians: The Oikopleura gaussica group" . Antarctic Science, vol. 15, no. 4, 2003, pp. 476-482.
http://dx.doi.org/10.1017/S0954102003001585
---------- VANCOUVER ----------
Capitanio, F.L., Daponte, M.C., Esnal, G.B. The classification of Antarctic appendicularians: The Oikopleura gaussica group. Antarct. Sci. 2003;15(4):476-482.
http://dx.doi.org/10.1017/S0954102003001585