New data about Helicosalpa Younti Kashkina 1973 (Tunicata: Thaliacea), a very rare salpid species

In the southeastern Pacific Ocean off Chilean coasts some salp solitary zooids were found showing the main features of Helicosalpa younti Kashkina 1973, excepting the arrangement of the light organs is like its close relative H. virgula. H. younti was created by van Soest (1974) based upon the descr...

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Detalles Bibliográficos
Publicado:	1998
Materias:	morphology zooplankton Pacific Ocean Helicosalpa Helicosalpa virgula Helicosalpa younti Invertebrata Salpidae Thaliacea Urochordata
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00074977_v62_n1_p73_Esnal http://hdl.handle.net/20.500.12110/paper_00074977_v62_n1_p73_Esnal
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00074977_v62_n1_p73_Esnal
record_format	dspace
spelling	paper:paper_00074977_v62_n1_p73_Esnal2023-06-08T14:31:49Z New data about Helicosalpa Younti Kashkina 1973 (Tunicata: Thaliacea), a very rare salpid species morphology zooplankton Pacific Ocean Helicosalpa Helicosalpa virgula Helicosalpa younti Invertebrata Salpidae Thaliacea Urochordata In the southeastern Pacific Ocean off Chilean coasts some salp solitary zooids were found showing the main features of Helicosalpa younti Kashkina 1973, excepting the arrangement of the light organs is like its close relative H. virgula. H. younti was created by van Soest (1974) based upon the descriptions from the literature of two solitary zooids, but very important diagnostic characters as the number of muscle fibers were unknown, and aggregate zooids were not described. In the Chilean coasts samples, many aggregate zooids were found which are also described making special mention of characteristics not known for H. younti (e.g., dorsal tubercle and muscle fiber number). The differences in muscle fiber number of both solitary and aggregate zooids, which surpass considerably any number known from H. virgula, added to details of the intermediate muscle arrangement in the solitary zooids, seem to justify the permanence of H. younti as a valid taxon. The arrangement of the light organs may be a variable feature within a salp species or perhaps, more likely, subject to post-preservation artifactual changes. Another feature traditionally employed in species differentiation, the morphology of the dorsal tubercle, is variable with the specimen size. 1998 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00074977_v62_n1_p73_Esnal http://hdl.handle.net/20.500.12110/paper_00074977_v62_n1_p73_Esnal
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	morphology zooplankton Pacific Ocean Helicosalpa Helicosalpa virgula Helicosalpa younti Invertebrata Salpidae Thaliacea Urochordata
spellingShingle	morphology zooplankton Pacific Ocean Helicosalpa Helicosalpa virgula Helicosalpa younti Invertebrata Salpidae Thaliacea Urochordata New data about Helicosalpa Younti Kashkina 1973 (Tunicata: Thaliacea), a very rare salpid species
topic_facet	morphology zooplankton Pacific Ocean Helicosalpa Helicosalpa virgula Helicosalpa younti Invertebrata Salpidae Thaliacea Urochordata
description	In the southeastern Pacific Ocean off Chilean coasts some salp solitary zooids were found showing the main features of Helicosalpa younti Kashkina 1973, excepting the arrangement of the light organs is like its close relative H. virgula. H. younti was created by van Soest (1974) based upon the descriptions from the literature of two solitary zooids, but very important diagnostic characters as the number of muscle fibers were unknown, and aggregate zooids were not described. In the Chilean coasts samples, many aggregate zooids were found which are also described making special mention of characteristics not known for H. younti (e.g., dorsal tubercle and muscle fiber number). The differences in muscle fiber number of both solitary and aggregate zooids, which surpass considerably any number known from H. virgula, added to details of the intermediate muscle arrangement in the solitary zooids, seem to justify the permanence of H. younti as a valid taxon. The arrangement of the light organs may be a variable feature within a salp species or perhaps, more likely, subject to post-preservation artifactual changes. Another feature traditionally employed in species differentiation, the morphology of the dorsal tubercle, is variable with the specimen size.
title	New data about Helicosalpa Younti Kashkina 1973 (Tunicata: Thaliacea), a very rare salpid species
title_short	New data about Helicosalpa Younti Kashkina 1973 (Tunicata: Thaliacea), a very rare salpid species
title_full	New data about Helicosalpa Younti Kashkina 1973 (Tunicata: Thaliacea), a very rare salpid species
title_fullStr	New data about Helicosalpa Younti Kashkina 1973 (Tunicata: Thaliacea), a very rare salpid species
title_full_unstemmed	New data about Helicosalpa Younti Kashkina 1973 (Tunicata: Thaliacea), a very rare salpid species
title_sort	new data about helicosalpa younti kashkina 1973 (tunicata: thaliacea), a very rare salpid species
publishDate	1998
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00074977_v62_n1_p73_Esnal http://hdl.handle.net/20.500.12110/paper_00074977_v62_n1_p73_Esnal
_version_	1768543066072809472

New data about Helicosalpa Younti Kashkina 1973 (Tunicata: Thaliacea), a very rare salpid species

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