On the taxonomy of the first record of rare deep-water rough shark species of Oxynotidae (Chondrichthyes: Squaliformes) in the western Indian Ocean
An immature female specimen of rough shark was collected south of Reunion Island in the Madagascar Basin in 2009 aboard R/V Dr. Fridtjof Nansen, representing the first official record of the family Oxynotidae in the western Indian Ocean. The specimen is herein identified as Oxynotus sp. due to morph...
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Online Access: | https://doi.org/10.11609/jott.3916.10.6.11732-11742 https://doaj.org/article/a198c8ae939340a4bb5ec3dedf5c9018 |
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ftdoajarticles:oai:doaj.org/article:a198c8ae939340a4bb5ec3dedf5c9018 2023-05-15T16:18:26+02:00 On the taxonomy of the first record of rare deep-water rough shark species of Oxynotidae (Chondrichthyes: Squaliformes) in the western Indian Ocean Sarah Viana Mark W. Lisher 2018-05-01T00:00:00Z https://doi.org/10.11609/jott.3916.10.6.11732-11742 https://doaj.org/article/a198c8ae939340a4bb5ec3dedf5c9018 EN eng Wildlife Information Liaison Development Society https://www.threatenedtaxa.org/index.php/JoTT/article/view/3916 https://doaj.org/toc/0974-7893 https://doaj.org/toc/0974-7907 0974-7893 0974-7907 doi:10.11609/jott.3916.10.6.11732-11742 https://doaj.org/article/a198c8ae939340a4bb5ec3dedf5c9018 Journal of Threatened Taxa, Vol 10, Iss 6, Pp 11732-11742 (2018) madagascar basin morphology oxynotus rough sharks taxonomy western indian ocean Ecology QH540-549.5 General. Including nature conservation geographical distribution QH1-199.5 article 2018 ftdoajarticles https://doi.org/10.11609/jott.3916.10.6.11732-11742 2022-12-31T05:43:53Z An immature female specimen of rough shark was collected south of Reunion Island in the Madagascar Basin in 2009 aboard R/V Dr. Fridtjof Nansen, representing the first official record of the family Oxynotidae in the western Indian Ocean. The specimen is herein identified as Oxynotus sp. due to morphological differences with its closely similar congeners O. centrina and O. bruniensis regarding morphometrics, shape of dorsal, pectoral and caudal fins, shape of the head and colouration, refuting the hypothesis of occurrence of these two species in the region. These results indicate that Oxynotus sp. is possibly an undescribed species. A general description of the external morphology, external morphometrics and photographs of Oxynotus sp. are provided. The specimen has a hepatosomatic index of 36.33% which reveals that it was possibly approaching maturation, suggesting that a viable population of Oxynotus sp. exists in the western Indian Ocean. Intraspecific variations in O. centrina from the Mediterranean Sea and eastern Atlantic Ocean are also noticed, requiring further taxonomic scrutiny. Article in Journal/Newspaper Fridtjof Nansen Directory of Open Access Journals: DOAJ Articles Fridtjof ENVELOPE(-56.717,-56.717,-63.567,-63.567) Indian Journal of Threatened Taxa 10 6 11732 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
madagascar basin morphology oxynotus rough sharks taxonomy western indian ocean Ecology QH540-549.5 General. Including nature conservation geographical distribution QH1-199.5 |
spellingShingle |
madagascar basin morphology oxynotus rough sharks taxonomy western indian ocean Ecology QH540-549.5 General. Including nature conservation geographical distribution QH1-199.5 Sarah Viana Mark W. Lisher On the taxonomy of the first record of rare deep-water rough shark species of Oxynotidae (Chondrichthyes: Squaliformes) in the western Indian Ocean |
topic_facet |
madagascar basin morphology oxynotus rough sharks taxonomy western indian ocean Ecology QH540-549.5 General. Including nature conservation geographical distribution QH1-199.5 |
description |
An immature female specimen of rough shark was collected south of Reunion Island in the Madagascar Basin in 2009 aboard R/V Dr. Fridtjof Nansen, representing the first official record of the family Oxynotidae in the western Indian Ocean. The specimen is herein identified as Oxynotus sp. due to morphological differences with its closely similar congeners O. centrina and O. bruniensis regarding morphometrics, shape of dorsal, pectoral and caudal fins, shape of the head and colouration, refuting the hypothesis of occurrence of these two species in the region. These results indicate that Oxynotus sp. is possibly an undescribed species. A general description of the external morphology, external morphometrics and photographs of Oxynotus sp. are provided. The specimen has a hepatosomatic index of 36.33% which reveals that it was possibly approaching maturation, suggesting that a viable population of Oxynotus sp. exists in the western Indian Ocean. Intraspecific variations in O. centrina from the Mediterranean Sea and eastern Atlantic Ocean are also noticed, requiring further taxonomic scrutiny. |
format |
Article in Journal/Newspaper |
author |
Sarah Viana Mark W. Lisher |
author_facet |
Sarah Viana Mark W. Lisher |
author_sort |
Sarah Viana |
title |
On the taxonomy of the first record of rare deep-water rough shark species of Oxynotidae (Chondrichthyes: Squaliformes) in the western Indian Ocean |
title_short |
On the taxonomy of the first record of rare deep-water rough shark species of Oxynotidae (Chondrichthyes: Squaliformes) in the western Indian Ocean |
title_full |
On the taxonomy of the first record of rare deep-water rough shark species of Oxynotidae (Chondrichthyes: Squaliformes) in the western Indian Ocean |
title_fullStr |
On the taxonomy of the first record of rare deep-water rough shark species of Oxynotidae (Chondrichthyes: Squaliformes) in the western Indian Ocean |
title_full_unstemmed |
On the taxonomy of the first record of rare deep-water rough shark species of Oxynotidae (Chondrichthyes: Squaliformes) in the western Indian Ocean |
title_sort |
on the taxonomy of the first record of rare deep-water rough shark species of oxynotidae (chondrichthyes: squaliformes) in the western indian ocean |
publisher |
Wildlife Information Liaison Development Society |
publishDate |
2018 |
url |
https://doi.org/10.11609/jott.3916.10.6.11732-11742 https://doaj.org/article/a198c8ae939340a4bb5ec3dedf5c9018 |
long_lat |
ENVELOPE(-56.717,-56.717,-63.567,-63.567) |
geographic |
Fridtjof Indian |
geographic_facet |
Fridtjof Indian |
genre |
Fridtjof Nansen |
genre_facet |
Fridtjof Nansen |
op_source |
Journal of Threatened Taxa, Vol 10, Iss 6, Pp 11732-11742 (2018) |
op_relation |
https://www.threatenedtaxa.org/index.php/JoTT/article/view/3916 https://doaj.org/toc/0974-7893 https://doaj.org/toc/0974-7907 0974-7893 0974-7907 doi:10.11609/jott.3916.10.6.11732-11742 https://doaj.org/article/a198c8ae939340a4bb5ec3dedf5c9018 |
op_doi |
https://doi.org/10.11609/jott.3916.10.6.11732-11742 |
container_title |
Journal of Threatened Taxa |
container_volume |
10 |
container_issue |
6 |
container_start_page |
11732 |
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1766004610338652160 |