Valhalloceras floweri Evans & King 1990
Valhalloceras floweri Evans & King, 1990 Figs 5H–N, 6C, 8B, 50B Valhalloceras floweri Evans & King, 1990: 628–629, pl. 1 figs 5–11, text-fig. 3. Diagnosis As for genus, by monotypy. Material examined Specimen FMNH-P30343 from Profilstranda section, adjacent to Hinlopenstretet, Spitsbergen, b...
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Zenodo
2021
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Online Access: | https://dx.doi.org/10.5281/zenodo.5795829 https://zenodo.org/record/5795829 |
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institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
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ftdatacite |
language |
unknown |
topic |
Biodiversity Taxonomy Animalia Mollusca Cephalopoda Oncocerida Phthanoncoceratidae Valhalloceras Valhalloceras floweri |
spellingShingle |
Biodiversity Taxonomy Animalia Mollusca Cephalopoda Oncocerida Phthanoncoceratidae Valhalloceras Valhalloceras floweri Kröger, Björn Pohle, Alexander Valhalloceras floweri Evans & King 1990 |
topic_facet |
Biodiversity Taxonomy Animalia Mollusca Cephalopoda Oncocerida Phthanoncoceratidae Valhalloceras Valhalloceras floweri |
description |
Valhalloceras floweri Evans & King, 1990 Figs 5H–N, 6C, 8B, 50B Valhalloceras floweri Evans & King, 1990: 628–629, pl. 1 figs 5–11, text-fig. 3. Diagnosis As for genus, by monotypy. Material examined Specimen FMNH-P30343 from Profilstranda section, adjacent to Hinlopenstretet, Spitsbergen, bed PO 123.3, 120.3 m above base of Olenidsletta Member, V2 a trilobite zone, and specimens FMNH-P30340, P30346, P30348, and P30350 from bed PO 131, 128 m above base of Olenidsletta Member, V2 b trilobite zone, Blackhillsian, Floian. Description Specimen FMNH-P30343 is the externally most complete specimen (Fig. 5H–I). It is a slightly crushed curved conch with a length of more than 30 mm which grows from 7.3 mm in height and 9.5 mm in width to 10 mm in height and 14 mm in width at a length of 15 mm (width expands with 17°, height with 10°). The cross section is depressed (rW: 1.3–1.5) and nearly elliptical at the adapical end of the specimen. The surface is ornamented with irregularly spaced fine growth lines, which run almost transversally at the ventral side and form a shallow broad sinus at the dorsal side. The internal characters of specimen FMNH-P30343 are not preserved. Three specimens with similar relative conch shape (rW: 1.3–1.6) occur in bed PO 131 and are better preserved internally. In specimen FMNH-P30340 from bed PO 131 at the Profilstranda section, the septal necks are orthochoanitic and the connecting rings are thickened and concave (figs 6C, 50B). The septal perforation is 1.7 mm in diameter and the connecting ring at approximately midlength between two chambers is 1.4 mm in diameter (0.11–0.14 of corresponding conch height). Approximately six chambers occur at a distance similar to the corresponding conch height. Remarks The type specimen of this species comes from a coastal outcrop between Lundehuken and Papegoyneset, adjacent to Hinlopenstretet, from a level near the top of V 2 in the terminology of Fortey (1980) (see Evans & King 1990). This is only a few kilometers south of the Profilstranda section, and at a level almost identical to beds PO 131, where the majority of our specimens of V. floweri were collected (see Fig. 1). Evans & King (1990) described and discussed Valhalloceras floweri in detail based on a single specimen, which expands laterally with an angle of 12° and dorsally with an angle of 19°, and which has a relative conch width (rW) of 1.4. Both values are closely similar to the specimens described herein. The specimens are also almost identical in conch cross section shape, conch curvature, in relative septal spacing and in the shape of the septal necks. However, the only available median section from specimens from our collection shows a siphuncle with contracted segments. This difference can be an effect of different preservation. In the type specimen, the septa and partly the connecting rings are strongly recrystallized and partly only traces of the former outlines are preserved (Evans & King 1990: pl. 1 figs 8, 10–11). Alternatively, the difference can be true and reflect different growth stages and ontogenetic change, because the figured siphuncle in the type is from a corresponding conch height of ca 7 mm, compared with the specimen figured herein (Fig. 50B) with a corresponding conch height of ca 14 mm. Depending on the interpretation of the differences, the genus Valhalloceras has tubular to concave or exclusively concave segments, respectively. In the former interpretation the genus would be transitional between Oncocerida and Ellesmerocerida and in the latter it would be a bassleroceratid, similar to Lawrenceoceras , but with orthochoanitic, instead of loxochoanitic septal necks. More material is needed to definitively solve this problem. Here we place the genus provisionally within the Phthanoncoceratidae, because the presence of tubular connecting rings during early growth stages is assumed to be real. : 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 76-77, DOI: 10.5852/ejt.2021.783.1601, http://zenodo.org/record/5793422 : {"references": ["Evans D. H. & King A. H. 1990. The affinities of early oncocerid nautiloids from the Lower Ordovician of Spitsbergen and Sweden. Palaeontology 33: 623 - 630.", "Fortey R. A. 1980. The Ordovician trilobites of Spitsbergen: 3. Remaining trilobites of the Valhalla Formation. Skrifter Norsk Polarinstitutt 171: 1 - 113."]} |
format |
Text |
author |
Kröger, Björn Pohle, Alexander |
author_facet |
Kröger, Björn Pohle, Alexander |
author_sort |
Kröger, Björn |
title |
Valhalloceras floweri Evans & King 1990 |
title_short |
Valhalloceras floweri Evans & King 1990 |
title_full |
Valhalloceras floweri Evans & King 1990 |
title_fullStr |
Valhalloceras floweri Evans & King 1990 |
title_full_unstemmed |
Valhalloceras floweri Evans & King 1990 |
title_sort |
valhalloceras floweri evans & king 1990 |
publisher |
Zenodo |
publishDate |
2021 |
url |
https://dx.doi.org/10.5281/zenodo.5795829 https://zenodo.org/record/5795829 |
long_lat |
ENVELOPE(16.847,16.847,79.498,79.498) ENVELOPE(161.933,161.933,-77.583,-77.583) ENVELOPE(20.728,20.728,79.246,79.246) ENVELOPE(17.831,17.831,79.815,79.815) |
geographic |
Ny Friesland Valhalla Hinlopenstretet Lundehuken |
geographic_facet |
Ny Friesland Valhalla Hinlopenstretet Lundehuken |
genre |
Norsk Polarinstitutt Ny Friesland Spitsbergen |
genre_facet |
Norsk Polarinstitutt Ny Friesland Spitsbergen |
op_relation |
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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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https://doi.org/10.5281/zenodo.5795829 https://doi.org/10.5852/ejt.2021.783.1601 https://doi.org/10.5281/zenodo.5793432 https://doi.org/10.5281/zenodo.5793436 https://doi.org/10.5281/zenodo.5793444 https://doi.org/10.5281/zenodo.5793576 https: |
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ftdatacite:10.5281/zenodo.5795829 2023-05-15T17:25:14+02:00 Valhalloceras floweri Evans & King 1990 Kröger, Björn Pohle, Alexander 2021 https://dx.doi.org/10.5281/zenodo.5795829 https://zenodo.org/record/5795829 unknown Zenodo http://zenodo.org/record/5793422 http://publication.plazi.org/id/A37DFFD4FFACFFAEFFD67F14FFDE7A64 http://zoobank.org/071EAD63-05ED-4D6C-AC45-8719E6D79E0B https://zenodo.org/communities/biosyslit https://dx.doi.org/10.5852/ejt.2021.783.1601 http://zenodo.org/record/5793422 http://publication.plazi.org/id/A37DFFD4FFACFFAEFFD67F14FFDE7A64 https://dx.doi.org/10.5281/zenodo.5793432 https://dx.doi.org/10.5281/zenodo.5793436 https://dx.doi.org/10.5281/zenodo.5793444 https://dx.doi.org/10.5281/zenodo.5793576 https://dx.doi.org/10.5281/zenodo.5793424 http://zoobank.org/071EAD63-05ED-4D6C-AC45-8719E6D79E0B https://dx.doi.org/10.5281/zenodo.5795828 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 Mollusca Cephalopoda Oncocerida Phthanoncoceratidae Valhalloceras Valhalloceras floweri Taxonomic treatment article-journal Text ScholarlyArticle 2021 ftdatacite https://doi.org/10.5281/zenodo.5795829 https://doi.org/10.5852/ejt.2021.783.1601 https://doi.org/10.5281/zenodo.5793432 https://doi.org/10.5281/zenodo.5793436 https://doi.org/10.5281/zenodo.5793444 https://doi.org/10.5281/zenodo.5793576 https: 2022-02-08T18:05:53Z Valhalloceras floweri Evans & King, 1990 Figs 5H–N, 6C, 8B, 50B Valhalloceras floweri Evans & King, 1990: 628–629, pl. 1 figs 5–11, text-fig. 3. Diagnosis As for genus, by monotypy. Material examined Specimen FMNH-P30343 from Profilstranda section, adjacent to Hinlopenstretet, Spitsbergen, bed PO 123.3, 120.3 m above base of Olenidsletta Member, V2 a trilobite zone, and specimens FMNH-P30340, P30346, P30348, and P30350 from bed PO 131, 128 m above base of Olenidsletta Member, V2 b trilobite zone, Blackhillsian, Floian. Description Specimen FMNH-P30343 is the externally most complete specimen (Fig. 5H–I). It is a slightly crushed curved conch with a length of more than 30 mm which grows from 7.3 mm in height and 9.5 mm in width to 10 mm in height and 14 mm in width at a length of 15 mm (width expands with 17°, height with 10°). The cross section is depressed (rW: 1.3–1.5) and nearly elliptical at the adapical end of the specimen. The surface is ornamented with irregularly spaced fine growth lines, which run almost transversally at the ventral side and form a shallow broad sinus at the dorsal side. The internal characters of specimen FMNH-P30343 are not preserved. Three specimens with similar relative conch shape (rW: 1.3–1.6) occur in bed PO 131 and are better preserved internally. In specimen FMNH-P30340 from bed PO 131 at the Profilstranda section, the septal necks are orthochoanitic and the connecting rings are thickened and concave (figs 6C, 50B). The septal perforation is 1.7 mm in diameter and the connecting ring at approximately midlength between two chambers is 1.4 mm in diameter (0.11–0.14 of corresponding conch height). Approximately six chambers occur at a distance similar to the corresponding conch height. Remarks The type specimen of this species comes from a coastal outcrop between Lundehuken and Papegoyneset, adjacent to Hinlopenstretet, from a level near the top of V 2 in the terminology of Fortey (1980) (see Evans & King 1990). This is only a few kilometers south of the Profilstranda section, and at a level almost identical to beds PO 131, where the majority of our specimens of V. floweri were collected (see Fig. 1). Evans & King (1990) described and discussed Valhalloceras floweri in detail based on a single specimen, which expands laterally with an angle of 12° and dorsally with an angle of 19°, and which has a relative conch width (rW) of 1.4. Both values are closely similar to the specimens described herein. The specimens are also almost identical in conch cross section shape, conch curvature, in relative septal spacing and in the shape of the septal necks. However, the only available median section from specimens from our collection shows a siphuncle with contracted segments. This difference can be an effect of different preservation. In the type specimen, the septa and partly the connecting rings are strongly recrystallized and partly only traces of the former outlines are preserved (Evans & King 1990: pl. 1 figs 8, 10–11). Alternatively, the difference can be true and reflect different growth stages and ontogenetic change, because the figured siphuncle in the type is from a corresponding conch height of ca 7 mm, compared with the specimen figured herein (Fig. 50B) with a corresponding conch height of ca 14 mm. Depending on the interpretation of the differences, the genus Valhalloceras has tubular to concave or exclusively concave segments, respectively. In the former interpretation the genus would be transitional between Oncocerida and Ellesmerocerida and in the latter it would be a bassleroceratid, similar to Lawrenceoceras , but with orthochoanitic, instead of loxochoanitic septal necks. More material is needed to definitively solve this problem. Here we place the genus provisionally within the Phthanoncoceratidae, because the presence of tubular connecting rings during early growth stages is assumed to be real. : 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 76-77, DOI: 10.5852/ejt.2021.783.1601, http://zenodo.org/record/5793422 : {"references": ["Evans D. H. & King A. H. 1990. The affinities of early oncocerid nautiloids from the Lower Ordovician of Spitsbergen and Sweden. Palaeontology 33: 623 - 630.", "Fortey R. A. 1980. The Ordovician trilobites of Spitsbergen: 3. Remaining trilobites of the Valhalla Formation. Skrifter Norsk Polarinstitutt 171: 1 - 113."]} Text Norsk Polarinstitutt Ny Friesland Spitsbergen DataCite Metadata Store (German National Library of Science and Technology) Ny Friesland ENVELOPE(16.847,16.847,79.498,79.498) Valhalla ENVELOPE(161.933,161.933,-77.583,-77.583) Hinlopenstretet ENVELOPE(20.728,20.728,79.246,79.246) Lundehuken ENVELOPE(17.831,17.831,79.815,79.815) |