Bathyraja trachura
Bathyraja trachura (Gilbert, 1892) Description: The egg cases of Bathyraja trachura (Figure 7) are small, 62 to 78 mm in length, with MAW about 77-97% of ECL. Egg case surfaces with prominent longitudinal striations and smooth to the touch. LKW very broad, striated, about 15-20% of MAW, and extendin...
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ftzenodo:oai:zenodo.org:6250543 2024-09-15T17:59:41+00:00 Bathyraja trachura David A. Ebert Chante D. Davis 2007-12-31 https://doi.org/10.5281/zenodo.6250543 http://treatment.plazi.org/id/F863C534903EF126CCC2A83323C1ECD8 unknown Zenodo http://publication.plazi.org/id/17349213E3557E9403747553351F425E https://sibils.text-analytics.ch/search/collections/plazi/F863C534903EF126CCC2A83323C1ECD8 https://www.gbif.org/species/100121851 http://zoobank.org/0C16005C-21BC-4252-823E-C83515FCFF28 https://zenodo.org/communities/biosyslit https://doi.org/10.5281/zenodo.6250542 https://doi.org/10.5281/zenodo.6250543 oai:zenodo.org:6250543 http://treatment.plazi.org/id/F863C534903EF126CCC2A83323C1ECD8 info:eu-repo/semantics/openAccess Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode Descriptions of skate egg cases (Chondrichthyes: Rajiformes: Rajoidei) from the eastern North Pacific., pp. 1-18 in Zootaxa, 1393, 9-10, (2007-12-31) Biodiversity Taxonomy Animalia Chordata Elasmobranchii Rajiformes Arhynchobatidae Bathyraja Bathyraja trachura info:eu-repo/semantics/other 2007 ftzenodo https://doi.org/10.5281/zenodo.625054310.5281/zenodo.6250542 2024-07-25T16:47:42Z Bathyraja trachura (Gilbert, 1892) Description: The egg cases of Bathyraja trachura (Figure 7) are small, 62 to 78 mm in length, with MAW about 77-97% of ECL. Egg case surfaces with prominent longitudinal striations and smooth to the touch. LKW very broad, striated, about 15-20% of MAW, and extending length of case including outer edge of horns; an inner keel is present along edge of both anterior and posterior horns. Attachment fibers present along lateral keels, originating about outer base of posterior horns. Anterior apron border broad and concave, anterior horns about one-half ECL, horns curved inwards toward median plane of egg case, tips curling towards ventral aspect of egg case, and flattening towards tips. Posterior apron nearly straight, broad, transverse, and up to 7 mm wider than posterior apron. Posterior horn length variable, 0.8 to 1.4 times ECL, horns curved inwards to median plane of egg case, and flattening towards tips. A distinct crossbar originating midway along posterior horns was present on six of nine egg case pairs. One pair had evidence of an incompletely formed crossbar and two had no evidence. This crossbar is unique among ENP skates. Color after preservation a dark brown becoming a light golden brown on keels. Remarks: Ebert (2005) described the egg case of this species, based on material from the eastern Bering Sea, and commented that the egg case described and figured by Cox (1963) as B. trachura was not that species. The egg case figured by Cox (1963: Figure 5), and captioned as Raja stellulata, is actually that of B. trachura. The posterior horns on some B. trachura egg cases, 75% in this study, have a unique crossbar that is not present on any of the other skate egg cases that we have examined from this region (Figure 7). In some instances the crossbar was broken or missing. Whether the crossbar remains intact, or for how long, once the egg case is deposited on the seafloor is unknown as we did not obtain any egg cases of this species in situ. Material examined: CAS 224340, ... Other/Unknown Material Bering Sea Zenodo |
institution |
Open Polar |
collection |
Zenodo |
op_collection_id |
ftzenodo |
language |
unknown |
topic |
Biodiversity Taxonomy Animalia Chordata Elasmobranchii Rajiformes Arhynchobatidae Bathyraja Bathyraja trachura |
spellingShingle |
Biodiversity Taxonomy Animalia Chordata Elasmobranchii Rajiformes Arhynchobatidae Bathyraja Bathyraja trachura David A. Ebert Chante D. Davis Bathyraja trachura |
topic_facet |
Biodiversity Taxonomy Animalia Chordata Elasmobranchii Rajiformes Arhynchobatidae Bathyraja Bathyraja trachura |
description |
Bathyraja trachura (Gilbert, 1892) Description: The egg cases of Bathyraja trachura (Figure 7) are small, 62 to 78 mm in length, with MAW about 77-97% of ECL. Egg case surfaces with prominent longitudinal striations and smooth to the touch. LKW very broad, striated, about 15-20% of MAW, and extending length of case including outer edge of horns; an inner keel is present along edge of both anterior and posterior horns. Attachment fibers present along lateral keels, originating about outer base of posterior horns. Anterior apron border broad and concave, anterior horns about one-half ECL, horns curved inwards toward median plane of egg case, tips curling towards ventral aspect of egg case, and flattening towards tips. Posterior apron nearly straight, broad, transverse, and up to 7 mm wider than posterior apron. Posterior horn length variable, 0.8 to 1.4 times ECL, horns curved inwards to median plane of egg case, and flattening towards tips. A distinct crossbar originating midway along posterior horns was present on six of nine egg case pairs. One pair had evidence of an incompletely formed crossbar and two had no evidence. This crossbar is unique among ENP skates. Color after preservation a dark brown becoming a light golden brown on keels. Remarks: Ebert (2005) described the egg case of this species, based on material from the eastern Bering Sea, and commented that the egg case described and figured by Cox (1963) as B. trachura was not that species. The egg case figured by Cox (1963: Figure 5), and captioned as Raja stellulata, is actually that of B. trachura. The posterior horns on some B. trachura egg cases, 75% in this study, have a unique crossbar that is not present on any of the other skate egg cases that we have examined from this region (Figure 7). In some instances the crossbar was broken or missing. Whether the crossbar remains intact, or for how long, once the egg case is deposited on the seafloor is unknown as we did not obtain any egg cases of this species in situ. Material examined: CAS 224340, ... |
format |
Other/Unknown Material |
author |
David A. Ebert Chante D. Davis |
author_facet |
David A. Ebert Chante D. Davis |
author_sort |
David A. Ebert |
title |
Bathyraja trachura |
title_short |
Bathyraja trachura |
title_full |
Bathyraja trachura |
title_fullStr |
Bathyraja trachura |
title_full_unstemmed |
Bathyraja trachura |
title_sort |
bathyraja trachura |
publisher |
Zenodo |
publishDate |
2007 |
url |
https://doi.org/10.5281/zenodo.6250543 http://treatment.plazi.org/id/F863C534903EF126CCC2A83323C1ECD8 |
genre |
Bering Sea |
genre_facet |
Bering Sea |
op_source |
Descriptions of skate egg cases (Chondrichthyes: Rajiformes: Rajoidei) from the eastern North Pacific., pp. 1-18 in Zootaxa, 1393, 9-10, (2007-12-31) |
op_relation |
http://publication.plazi.org/id/17349213E3557E9403747553351F425E https://sibils.text-analytics.ch/search/collections/plazi/F863C534903EF126CCC2A83323C1ECD8 https://www.gbif.org/species/100121851 http://zoobank.org/0C16005C-21BC-4252-823E-C83515FCFF28 https://zenodo.org/communities/biosyslit https://doi.org/10.5281/zenodo.6250542 https://doi.org/10.5281/zenodo.6250543 oai:zenodo.org:6250543 http://treatment.plazi.org/id/F863C534903EF126CCC2A83323C1ECD8 |
op_rights |
info:eu-repo/semantics/openAccess Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode |
op_doi |
https://doi.org/10.5281/zenodo.625054310.5281/zenodo.6250542 |
_version_ |
1810436790182477824 |