Cyclostomiceras profilstrandense Kröger & Pohle 2021, sp. nov.
Creators
- 1. Finnish Museum of Natural History, University of Helsinki, PO Box 44, FI- 00014 Helsinki, Finland.
- 2. Paläontologisches Institut und Museum, University of Zurich, Zurich, Switzerland.
Description
Cyclostomiceras profilstrandense sp. nov.
urn:lsid:zoobank.org:act: 538BB8F6-F83E-47EA-A28F-AD4E316CDAFC
Fig. 5O–Q
DiagnosisSmall Cyclostomiceras with adult conch width of ca 14 mm, slightly depressed conch cross section; ornamented with shallow, widely spaced, directly transverse annulations.
EtymologyReferring to the type locality.
Type materialHolotype Specimen FMNH-P30336, by monotypy.
Type locality and horizonProfilstranda section, adjacent to Hinlopenstretet, Spitsbergen, from bed Po123.3, 120.3 m above base of Olenidsletta Member, V 2a trilobite zone, Blackhillsian, Floian.
DescriptionSpecimen FMNH-P30336 is a fragment of part of the phragmocone and a nearly complete body chamber. At the base of the body chamber the cross section is slightly depressed, the conch height is 11.8 mm, the width 12.3 mm (rW = 1.08). The maximum conch width is 13.7 mm and reached at ca mid-length of the body chamber. The length of the body chamber is 11 mm, and its aperture is simple transverse and slightly contracted with a width of 13.5 mm (angle of expansion of conch width 6°).
The conch surface is ornamented with widely rounded annuli which have a distance of ca 3 mm in distance (ca 0.25 of corresponding conch height). Additionally, distinct, irregularly spaced growth lines occur. The annuli and the growth lines form a shallow hyponomic sinus at the prosiphuncular side of the conch.
The chamber spacing is narrow with a distance between two septa of ca 1.3 mm at an assumed conch height of ca 11 mm. The sutures form a very shallow lateral lobe. The siphuncle is preserved in the last chamber, and has a thickness of ca 1.1 mm and a distance from the conch margin of 0.8 mm and is presumably tubular.
ComparisonThe conch shape and conch dimensions are almost identical to those of Cyclostomiceras minimum (Whitfield, 1886) from the Fort Cassin Formation, Vermont, USA (see Ulrich et al. 1943). However, the new species differs in possessing a weakly ornamented conch surface.
Notes
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Linked records
Additional details
Biodiversity
- Collection code
- FMNH-P
- Family
- Cyclostomiceratidae
- Genus
- Cyclostomiceras
- Kingdom
- Animalia
- Material sample ID
- FMNH-P30336
- Order
- Tetrabranchia
- Phylum
- Mollusca
- Scientific name authorship
- Kröger & Pohle
- Species
- profilstrandense
- Taxonomic status
- sp. nov.
- Taxon rank
- species
- Type status
- holotype
- Taxonomic concept label
- Cyclostomiceras profilstrandense Kröger & Pohle, 2021
References
- Ulrich E. O., Foerste A. F. & Miller A. K. 1943. Ozarkian and Canadian cephalopods. Part II. Brevicones. Geological Society of America Special Papers 59: 1 - 240. https: // doi. org / 10.1130 / SPE 49 - p 1