Determining the correct identity of South African Marthasterias (Echinodermata: Asteroidea)
13 páginas, 7 figuras, 6 tablas, 1 apéndice Marthasterias glacialis are found in the cool-temperate waters of the north-eastern Atlantic Ocean, in the subtropical waters of the Mediterranean Sea and along the south-western tip of Africa. The South African Marthasterias population includes two morpho...
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Online Access: | http://hdl.handle.net/10261/139777 https://doi.org/10.2989/1814232X.2016.1222308 |
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ftcsic:oai:digital.csic.es:10261/139777 2024-02-11T10:06:54+01:00 Determining the correct identity of South African Marthasterias (Echinodermata: Asteroidea) Wright, A. G. Pérez-Portela, R. Griffiths, C. L. 2016 http://hdl.handle.net/10261/139777 https://doi.org/10.2989/1814232X.2016.1222308 en eng Taylor & Francis http://dx.doi.org/10.2989/1814232X.2016.1222308 Sí African Journal of Marine Science 38(3) : 443-455 (2016) 1814-232X http://hdl.handle.net/10261/139777 doi:10.2989/1814232X.2016.1222308 1814-2338 none Genetics Morphology Taxonomy artículo http://purl.org/coar/resource_type/c_6501 2016 ftcsic https://doi.org/10.2989/1814232X.2016.1222308 2024-01-16T10:18:31Z 13 páginas, 7 figuras, 6 tablas, 1 apéndice Marthasterias glacialis are found in the cool-temperate waters of the north-eastern Atlantic Ocean, in the subtropical waters of the Mediterranean Sea and along the south-western tip of Africa. The South African Marthasterias population includes two morphotypes, a smooth, spineless rarispina form and a spiny africana form, that have been described as separate species, subspecies, or forma by various authors over the past century. To test whether these two morphotypes represent separate species, and whether either, or both, are conspecific with the North-East Atlantic species, 78 Marthasterias were collected from the Cape Peninsula of South Africa. Morphological comparisons between individuals of the two forms showed no significant clustering of samples, indicating that there is no morphological separation of the two South African forms into distinct groupings. The africana and rarispina forms were also shown to be genetically indistinguishable, using a fragment of the mitochondrial cytochrome c oxidase subunit I (COI) gene and the nuclear internal transcribed spacer 1 (ITS1). In addition, the COI sequences were also compared to those from European specimens, and phylogenetic reconstruction and intra- and interspecific levels of divergence suggested that the South African specimens form a single group that is genetically distinct from the European M. glacialis. Although the allopatric distribution, high genetic divergence (more than 3% for the COI fragment) and morphological differences suggest that the South African form should be raised to species status under the name Marthasterias africana, further work must assess an independent genetic marker (nuclear) to support raising the COI clade to species level. True M. glacialis have a spine-armament pattern of a series of three or more regular spine rows down the length of each arm, whereas M. africana are either covered in many irregularly spaced spines, or have an extraordinarily bare surface with only two spine rows ... Article in Journal/Newspaper North East Atlantic Digital.CSIC (Spanish National Research Council) African Journal of Marine Science 38 3 443 455 |
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Open Polar |
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Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
topic |
Genetics Morphology Taxonomy |
spellingShingle |
Genetics Morphology Taxonomy Wright, A. G. Pérez-Portela, R. Griffiths, C. L. Determining the correct identity of South African Marthasterias (Echinodermata: Asteroidea) |
topic_facet |
Genetics Morphology Taxonomy |
description |
13 páginas, 7 figuras, 6 tablas, 1 apéndice Marthasterias glacialis are found in the cool-temperate waters of the north-eastern Atlantic Ocean, in the subtropical waters of the Mediterranean Sea and along the south-western tip of Africa. The South African Marthasterias population includes two morphotypes, a smooth, spineless rarispina form and a spiny africana form, that have been described as separate species, subspecies, or forma by various authors over the past century. To test whether these two morphotypes represent separate species, and whether either, or both, are conspecific with the North-East Atlantic species, 78 Marthasterias were collected from the Cape Peninsula of South Africa. Morphological comparisons between individuals of the two forms showed no significant clustering of samples, indicating that there is no morphological separation of the two South African forms into distinct groupings. The africana and rarispina forms were also shown to be genetically indistinguishable, using a fragment of the mitochondrial cytochrome c oxidase subunit I (COI) gene and the nuclear internal transcribed spacer 1 (ITS1). In addition, the COI sequences were also compared to those from European specimens, and phylogenetic reconstruction and intra- and interspecific levels of divergence suggested that the South African specimens form a single group that is genetically distinct from the European M. glacialis. Although the allopatric distribution, high genetic divergence (more than 3% for the COI fragment) and morphological differences suggest that the South African form should be raised to species status under the name Marthasterias africana, further work must assess an independent genetic marker (nuclear) to support raising the COI clade to species level. True M. glacialis have a spine-armament pattern of a series of three or more regular spine rows down the length of each arm, whereas M. africana are either covered in many irregularly spaced spines, or have an extraordinarily bare surface with only two spine rows ... |
format |
Article in Journal/Newspaper |
author |
Wright, A. G. Pérez-Portela, R. Griffiths, C. L. |
author_facet |
Wright, A. G. Pérez-Portela, R. Griffiths, C. L. |
author_sort |
Wright, A. G. |
title |
Determining the correct identity of South African Marthasterias (Echinodermata: Asteroidea) |
title_short |
Determining the correct identity of South African Marthasterias (Echinodermata: Asteroidea) |
title_full |
Determining the correct identity of South African Marthasterias (Echinodermata: Asteroidea) |
title_fullStr |
Determining the correct identity of South African Marthasterias (Echinodermata: Asteroidea) |
title_full_unstemmed |
Determining the correct identity of South African Marthasterias (Echinodermata: Asteroidea) |
title_sort |
determining the correct identity of south african marthasterias (echinodermata: asteroidea) |
publisher |
Taylor & Francis |
publishDate |
2016 |
url |
http://hdl.handle.net/10261/139777 https://doi.org/10.2989/1814232X.2016.1222308 |
genre |
North East Atlantic |
genre_facet |
North East Atlantic |
op_relation |
http://dx.doi.org/10.2989/1814232X.2016.1222308 Sí African Journal of Marine Science 38(3) : 443-455 (2016) 1814-232X http://hdl.handle.net/10261/139777 doi:10.2989/1814232X.2016.1222308 1814-2338 |
op_rights |
none |
op_doi |
https://doi.org/10.2989/1814232X.2016.1222308 |
container_title |
African Journal of Marine Science |
container_volume |
38 |
container_issue |
3 |
container_start_page |
443 |
op_container_end_page |
455 |
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1790604933021564928 |