Bathyraja microtrachys Osburn & Nichols 1916
Bathyraja microtrachys (Osburn & Nichols, 1916) Description : The egg cases of Bathyraja microtrachys (Figure 5) are small, 79 to 81 mm in length, with MAW about 63–64 % of ECL. The egg case surface is coarsely striated, with irregular rasplike denticles, making its texture very rough to the to...
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Zenodo
2007
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Online Access: | https://dx.doi.org/10.5281/zenodo.6246890 https://zenodo.org/record/6246890 |
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Open Polar |
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DataCite Metadata Store (German National Library of Science and Technology) |
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topic |
Biodiversity Taxonomy Animalia Chordata Elasmobranchii Rajiformes Arhynchobatidae Bathyraja Bathyraja microtrachys |
spellingShingle |
Biodiversity Taxonomy Animalia Chordata Elasmobranchii Rajiformes Arhynchobatidae Bathyraja Bathyraja microtrachys Ebert, David A. Davis, Chante D. Bathyraja microtrachys Osburn & Nichols 1916 |
topic_facet |
Biodiversity Taxonomy Animalia Chordata Elasmobranchii Rajiformes Arhynchobatidae Bathyraja Bathyraja microtrachys |
description |
Bathyraja microtrachys (Osburn & Nichols, 1916) Description : The egg cases of Bathyraja microtrachys (Figure 5) are small, 79 to 81 mm in length, with MAW about 63–64 % of ECL. The egg case surface is coarsely striated, with irregular rasplike denticles, making its texture very rough to the touch. LKW is very narrow, <5 % of MAW and not extending onto horns. Anterior apron border of egg case broad, deeply concave, anterior horns robust at base, but flattening towards tips and becoming threadlike, tips curving dorsally and back towards egg case. Posterior apron is nearly straight, broad, and transverse, width similar to anterior. Posterior horns robust at base, very long, about 66 % length of anteriors and about 1.1 times ECL, curved inwards, each tapering to a threadlike tip. Attachment fibers present, extending length of lateral keel. Egg cases removed from a single preserved specimen were a dark golden brown. Remarks : This is the first confirmed record, and description, of the egg case of this species. The egg cases described here were removed in utero from a 62.8 cm TL specimen (SIO 8780). Cox (1963: Figure 7) suggested that the egg case he described and illustrated as B. trachura may eventually prove to be this species. However, the term embryo that was removed from that egg case (CAS 25617), and described below, appear to be that of B. spinossisima (Ebert, 2005). Until recently this species had been considered a synonym of B. trachura (Ebert, 2003). However, examination of the holotypes of B. microtrachys and B. trachura by the senior author, plus additional material confirm that these species are distinct. To further separate these two species their egg cases can be used to distinguish them from each other. The egg case of B. microtrachys differs from that of B. trachura in that the former has very narrow lateral keels and a coarsely striated surface texture that is rough to the touch, while the latter has very broad lateral keels and is smooth to the touch. Bathyraja microtrachys is one of the deepest occurring skate species, known to occur down to at least 3,100 m (unpublished data). The shallowest record of this species is the holotype known from 1,995 m. All other records of it have come from depths greater than 2,000 m. Material examined : SIO 8780, 62.8 cm TL, off Waldport, Oregon (44.4130 N, 125.3410 W), 2850 m, 6 February 1987. : Published as part of Ebert, David A. & Davis, Chante D., 2007, Descriptions of skate egg cases (Chondrichthyes: Rajiformes: Rajoidei) from the eastern North Pacific, pp. 1-18 in Zootaxa 1393 on pages 6-7, DOI: 10.5281/zenodo.175296 : {"references": ["Osburn, R. C. & Nichols, J. T. (1916) Shore fishes collected by the ' Albatross' expedition in Lower California with descriptions of new species. Bulletin of the American Museum of Natural History, 35 (16), 139 - 181.", "Cox, K. W. (1963) Egg cases of some elasmobranchs and a cyclostome from Californian waters. California Fish & Game, 49, 271 - 289.", "Ebert, D. A. (2005) Reproductive biology of skates, Bathyraja (Ishiyama), along the eastern Bering Sea continental slope. Journal of Fish Biology, 66, 618 - 649.", "Ebert, D. A. (2003) The sharks, rays and chimaeras of California. University California Press, 284 pp."]} |
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Text |
author |
Ebert, David A. Davis, Chante D. |
author_facet |
Ebert, David A. Davis, Chante D. |
author_sort |
Ebert, David A. |
title |
Bathyraja microtrachys Osburn & Nichols 1916 |
title_short |
Bathyraja microtrachys Osburn & Nichols 1916 |
title_full |
Bathyraja microtrachys Osburn & Nichols 1916 |
title_fullStr |
Bathyraja microtrachys Osburn & Nichols 1916 |
title_full_unstemmed |
Bathyraja microtrachys Osburn & Nichols 1916 |
title_sort |
bathyraja microtrachys osburn & nichols 1916 |
publisher |
Zenodo |
publishDate |
2007 |
url |
https://dx.doi.org/10.5281/zenodo.6246890 https://zenodo.org/record/6246890 |
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Bering Sea Pacific |
geographic_facet |
Bering Sea Pacific |
genre |
Bering Sea |
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Bering Sea |
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Open Access Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode cc0-1.0 info:eu-repo/semantics/openAccess |
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op_doi |
https://doi.org/10.5281/zenodo.6246890 https://doi.org/10.5281/zenodo.175296 https://doi.org/10.5281/zenodo.175298 https://doi.org/10.5281/zenodo.6246891 |
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ftdatacite:10.5281/zenodo.6246890 2023-05-15T15:44:03+02:00 Bathyraja microtrachys Osburn & Nichols 1916 Ebert, David A. Davis, Chante D. 2007 https://dx.doi.org/10.5281/zenodo.6246890 https://zenodo.org/record/6246890 unknown Zenodo http://publication.plazi.org/id/FFDC5F3DD7373813FF2C4949FFCEFFCA http://zoobank.org/0C16005C-21BC-4252-823E-C83515FCFF28 https://zenodo.org/communities/biosyslit https://dx.doi.org/10.5281/zenodo.175296 http://publication.plazi.org/id/FFDC5F3DD7373813FF2C4949FFCEFFCA https://dx.doi.org/10.5281/zenodo.175298 http://zoobank.org/0C16005C-21BC-4252-823E-C83515FCFF28 https://dx.doi.org/10.5281/zenodo.6246891 https://zenodo.org/communities/biosyslit Open Access Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode cc0-1.0 info:eu-repo/semantics/openAccess CC0 Biodiversity Taxonomy Animalia Chordata Elasmobranchii Rajiformes Arhynchobatidae Bathyraja Bathyraja microtrachys article-journal ScholarlyArticle Taxonomic treatment Text 2007 ftdatacite https://doi.org/10.5281/zenodo.6246890 https://doi.org/10.5281/zenodo.175296 https://doi.org/10.5281/zenodo.175298 https://doi.org/10.5281/zenodo.6246891 2022-04-01T12:18:12Z Bathyraja microtrachys (Osburn & Nichols, 1916) Description : The egg cases of Bathyraja microtrachys (Figure 5) are small, 79 to 81 mm in length, with MAW about 63–64 % of ECL. The egg case surface is coarsely striated, with irregular rasplike denticles, making its texture very rough to the touch. LKW is very narrow, <5 % of MAW and not extending onto horns. Anterior apron border of egg case broad, deeply concave, anterior horns robust at base, but flattening towards tips and becoming threadlike, tips curving dorsally and back towards egg case. Posterior apron is nearly straight, broad, and transverse, width similar to anterior. Posterior horns robust at base, very long, about 66 % length of anteriors and about 1.1 times ECL, curved inwards, each tapering to a threadlike tip. Attachment fibers present, extending length of lateral keel. Egg cases removed from a single preserved specimen were a dark golden brown. Remarks : This is the first confirmed record, and description, of the egg case of this species. The egg cases described here were removed in utero from a 62.8 cm TL specimen (SIO 8780). Cox (1963: Figure 7) suggested that the egg case he described and illustrated as B. trachura may eventually prove to be this species. However, the term embryo that was removed from that egg case (CAS 25617), and described below, appear to be that of B. spinossisima (Ebert, 2005). Until recently this species had been considered a synonym of B. trachura (Ebert, 2003). However, examination of the holotypes of B. microtrachys and B. trachura by the senior author, plus additional material confirm that these species are distinct. To further separate these two species their egg cases can be used to distinguish them from each other. The egg case of B. microtrachys differs from that of B. trachura in that the former has very narrow lateral keels and a coarsely striated surface texture that is rough to the touch, while the latter has very broad lateral keels and is smooth to the touch. Bathyraja microtrachys is one of the deepest occurring skate species, known to occur down to at least 3,100 m (unpublished data). The shallowest record of this species is the holotype known from 1,995 m. All other records of it have come from depths greater than 2,000 m. Material examined : SIO 8780, 62.8 cm TL, off Waldport, Oregon (44.4130 N, 125.3410 W), 2850 m, 6 February 1987. : Published as part of Ebert, David A. & Davis, Chante D., 2007, Descriptions of skate egg cases (Chondrichthyes: Rajiformes: Rajoidei) from the eastern North Pacific, pp. 1-18 in Zootaxa 1393 on pages 6-7, DOI: 10.5281/zenodo.175296 : {"references": ["Osburn, R. C. & Nichols, J. T. (1916) Shore fishes collected by the ' Albatross' expedition in Lower California with descriptions of new species. Bulletin of the American Museum of Natural History, 35 (16), 139 - 181.", "Cox, K. W. (1963) Egg cases of some elasmobranchs and a cyclostome from Californian waters. California Fish & Game, 49, 271 - 289.", "Ebert, D. A. (2005) Reproductive biology of skates, Bathyraja (Ishiyama), along the eastern Bering Sea continental slope. Journal of Fish Biology, 66, 618 - 649.", "Ebert, D. A. (2003) The sharks, rays and chimaeras of California. University California Press, 284 pp."]} Text Bering Sea DataCite Metadata Store (German National Library of Science and Technology) Bering Sea Pacific |