Deltoceras Hyatt 1894
Genus Deltoceras Hyatt, 1894 Type species Deltoceras planum Hyatt, 1894, from strata of the St. George Group (Lower Ordovician) at Port au Choix, north side, western Newfoundland, Canada; by original designation. Emended diagnosis Rapidly expanding evolute conch possessing whorls with a compressed c...
Main Authors: | , |
---|---|
Format: | Other/Unknown Material |
Language: | unknown |
Published: |
2021
|
Subjects: | |
Online Access: | https://zenodo.org/record/5793588 https://doi.org/10.5281/zenodo.5793588 |
id |
ftzenodo:oai:zenodo.org:5793588 |
---|---|
record_format |
openpolar |
spelling |
ftzenodo:oai:zenodo.org:5793588 2023-06-06T11:52:25+02:00 Deltoceras Hyatt 1894 Kröger, Björn Pohle, Alexander 2021-12-20 https://zenodo.org/record/5793588 https://doi.org/10.5281/zenodo.5793588 unknown info:eu-repo/semantics/altIdentifier/url/http://treatment.plazi.org/id/5F4487ACFF91FF90FDB17E1DFD7F78EA doi:10.5852/ejt.2021.783.1601 http://zenodo.org/record/5793422 http://publication.plazi.org/id/A37DFFD4FFACFFAEFFD67F14FFDE7A64 http://zoobank.org/071EAD63-05ED-4D6C-AC45-8719E6D79E0B doi:10.5281/zenodo.5793587 https://zenodo.org/communities/biosyslit https://zenodo.org/record/5793588 https://doi.org/10.5281/zenodo.5793588 oai:zenodo.org:5793588 info:eu-repo/semantics/openAccess https://creativecommons.org/publicdomain/zero/1.0/legalcode Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities, pp. 1-102 in European Journal of Taxonomy 783(1) 62-63 Biodiversity Taxonomy Animalia Mollusca Cephalopoda Tetrabranchia Estonioceratidae Deltoceras info:eu-repo/semantics/other publication-taxonomictreatment 2021 ftzenodo https://doi.org/10.5281/zenodo.579358810.5852/ejt.2021.783.160110.5281/zenodo.5793587 2023-04-13T21:49:35Z Genus Deltoceras Hyatt, 1894 Type species Deltoceras planum Hyatt, 1894, from strata of the St. George Group (Lower Ordovician) at Port au Choix, north side, western Newfoundland, Canada; by original designation. Emended diagnosis Rapidly expanding evolute conch possessing whorls with a compressed cross section with very shallow or lacking zone of impression; adoral portion of conch divergent from preceding whorl at maturity; no conspicuous shell sculpture; sutures form weak lateral lobes; siphuncle subventral in position (adopted from Evans 2011). Remarks The exact location of the only known specimen of the type species is given in Hyatt (1894: 450) as “Port au Choix, north side” without specifying wether this relates to the Port au Choix peninsula or the town of Port au Choix. Deltoceras is listed under doubtful taxa in Teichert (1964), but Evans (2011) revived the genus and provided a concise diagnosis adopted from Ulrich et al. (1942), which is used herein. The genus diagnosis is slightly emended and expanded, herein, from being exclusively without dorsal impression zone to also having a very shallow impressive zone, in order to include Deltoceras beluga sp. nov. We justify this emendation also based on the poor knowledge on the details of the single specimen of the type species, which may also during earlier growth stages have a slightly involute conch curvature. The emphasis of this genus now is the combination of strongly compressed smooth whorls with a subventrally positioned siphuncle. Published as part of Kröger, Björn & Pohle, Alexander, 2021, Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities, pp. 1-102 in European Journal of Taxonomy 783 (1) on pages 62-63, DOI:10.5852/ejt.2021.783.1601, http://zenodo.org/record/5793422 Other/Unknown Material Beluga Beluga* Newfoundland Ny Friesland Port au Choix Spitsbergen Zenodo Canada Hyatt ENVELOPE(-65.833,-65.833,-65.750,-65.750) Ny Friesland ENVELOPE(16.847,16.847,79.498,79.498) Port au Choix ENVELOPE(-57.365,-57.365,50.717,50.717) Port au Choix Peninsula ENVELOPE(-57.348,-57.348,50.717,50.717) |
institution |
Open Polar |
collection |
Zenodo |
op_collection_id |
ftzenodo |
language |
unknown |
topic |
Biodiversity Taxonomy Animalia Mollusca Cephalopoda Tetrabranchia Estonioceratidae Deltoceras |
spellingShingle |
Biodiversity Taxonomy Animalia Mollusca Cephalopoda Tetrabranchia Estonioceratidae Deltoceras Kröger, Björn Pohle, Alexander Deltoceras Hyatt 1894 |
topic_facet |
Biodiversity Taxonomy Animalia Mollusca Cephalopoda Tetrabranchia Estonioceratidae Deltoceras |
description |
Genus Deltoceras Hyatt, 1894 Type species Deltoceras planum Hyatt, 1894, from strata of the St. George Group (Lower Ordovician) at Port au Choix, north side, western Newfoundland, Canada; by original designation. Emended diagnosis Rapidly expanding evolute conch possessing whorls with a compressed cross section with very shallow or lacking zone of impression; adoral portion of conch divergent from preceding whorl at maturity; no conspicuous shell sculpture; sutures form weak lateral lobes; siphuncle subventral in position (adopted from Evans 2011). Remarks The exact location of the only known specimen of the type species is given in Hyatt (1894: 450) as “Port au Choix, north side” without specifying wether this relates to the Port au Choix peninsula or the town of Port au Choix. Deltoceras is listed under doubtful taxa in Teichert (1964), but Evans (2011) revived the genus and provided a concise diagnosis adopted from Ulrich et al. (1942), which is used herein. The genus diagnosis is slightly emended and expanded, herein, from being exclusively without dorsal impression zone to also having a very shallow impressive zone, in order to include Deltoceras beluga sp. nov. We justify this emendation also based on the poor knowledge on the details of the single specimen of the type species, which may also during earlier growth stages have a slightly involute conch curvature. The emphasis of this genus now is the combination of strongly compressed smooth whorls with a subventrally positioned siphuncle. Published as part of Kröger, Björn & Pohle, Alexander, 2021, Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities, pp. 1-102 in European Journal of Taxonomy 783 (1) on pages 62-63, DOI:10.5852/ejt.2021.783.1601, http://zenodo.org/record/5793422 |
format |
Other/Unknown Material |
author |
Kröger, Björn Pohle, Alexander |
author_facet |
Kröger, Björn Pohle, Alexander |
author_sort |
Kröger, Björn |
title |
Deltoceras Hyatt 1894 |
title_short |
Deltoceras Hyatt 1894 |
title_full |
Deltoceras Hyatt 1894 |
title_fullStr |
Deltoceras Hyatt 1894 |
title_full_unstemmed |
Deltoceras Hyatt 1894 |
title_sort |
deltoceras hyatt 1894 |
publishDate |
2021 |
url |
https://zenodo.org/record/5793588 https://doi.org/10.5281/zenodo.5793588 |
long_lat |
ENVELOPE(-65.833,-65.833,-65.750,-65.750) ENVELOPE(16.847,16.847,79.498,79.498) ENVELOPE(-57.365,-57.365,50.717,50.717) ENVELOPE(-57.348,-57.348,50.717,50.717) |
geographic |
Canada Hyatt Ny Friesland Port au Choix Port au Choix Peninsula |
geographic_facet |
Canada Hyatt Ny Friesland Port au Choix Port au Choix Peninsula |
genre |
Beluga Beluga* Newfoundland Ny Friesland Port au Choix Spitsbergen |
genre_facet |
Beluga Beluga* Newfoundland Ny Friesland Port au Choix Spitsbergen |
op_source |
Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities, pp. 1-102 in European Journal of Taxonomy 783(1) 62-63 |
op_relation |
info:eu-repo/semantics/altIdentifier/url/http://treatment.plazi.org/id/5F4487ACFF91FF90FDB17E1DFD7F78EA doi:10.5852/ejt.2021.783.1601 http://zenodo.org/record/5793422 http://publication.plazi.org/id/A37DFFD4FFACFFAEFFD67F14FFDE7A64 http://zoobank.org/071EAD63-05ED-4D6C-AC45-8719E6D79E0B doi:10.5281/zenodo.5793587 https://zenodo.org/communities/biosyslit https://zenodo.org/record/5793588 https://doi.org/10.5281/zenodo.5793588 oai:zenodo.org:5793588 |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/publicdomain/zero/1.0/legalcode |
op_doi |
https://doi.org/10.5281/zenodo.579358810.5852/ejt.2021.783.160110.5281/zenodo.5793587 |
_version_ |
1767958274516189184 |