Cyptendoceras undefined-a
- Dataset
- Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities
- Rank
- SPECIES
Classification
- phylum
- Mollusca
- class
- Cephalopoda
- order
- Tetrabranchia
- family
- Cyptendoceratidae
- genus
- Cyptendoceras
- species
- Cyptendoceras undefined-a
description
Description The specimen is a fragment of a slightly crushed 30 mm long portion of a body chamber with the last septum preserved. The conch is smooth, straight and slender and has an elliptically depressed cross section with a height of 18 mm and a width of 22 mm (rW = 1.22). The preserved septum forms a suture that is slightly oblique across the flanks of the conch shifted toward the aperture at the antisiphuncular side of the conch; it forms shallow lateral saddles, is almost transverse dorsally, and forms a deep, broad u-shaped ventral lobe. The siphuncle is marginally positioned and elliptically depressed with a septal perforation 8 mm in height and 9 mm in width (rSD = 0.4). No details of the septal necks or the connecting ring are preserved.
description
Fig. 9 F – G
discussion
Remarks The specimen is assigned to Cyptendoceras because of the presence of the characteristic u-shaped ventral lobe. However, neither the septal spacing, nor the details of the septal necks and connecting ring are known, which precludes a species level determination of the specimen.
materials_examined
Material examined Specimen FMNH-P 30426, from Profilstranda section, adjacent to Hinlopenstretet, Spitsbergen, bed PO 07, 4 m above base of Olenidsletta Member, V 1 a trilobite zone, Blackhillsian, Floian.
Name
- Homonyms
- Cyptendoceras undefined-a