Fig. 29 in Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities

Fig. 29. Median sections of phragmocones of Bactroceras Holm, 1898. A, C–D. Bactroceras fluvii sp. nov., from Profilbekken river basin, locality PR-phosphatic. A. Specimen FMNH-P30159, with adapical siphuncular segment, taphonomically slightly distorted.B. Bactroceras boliviensis Aubrechtová, 2015,...

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Bibliographic Details
Main Authors: Kröger, Björn, Pohle, Alexander
Format: Still Image
Language:unknown
Published: Zenodo 2021
Subjects:
Biodiversity
Taxonomy
Animalia
Mollusca
Cephalopoda
Tetrabranchia
Rioceratidae
Svalbardocreas
Orthocerida
Baltoceratidae
Bactroceras
Ny Friesland
Spitsbergen
Online Access:https://dx.doi.org/10.5281/zenodo.5793511
https://zenodo.org/record/5793511
Description
Summary:Fig. 29. Median sections of phragmocones of Bactroceras Holm, 1898. A, C–D. Bactroceras fluvii sp. nov., from Profilbekken river basin, locality PR-phosphatic. A. Specimen FMNH-P30159, with adapical siphuncular segment, taphonomically slightly distorted.B. Bactroceras boliviensis Aubrechtová, 2015, FMNH-P30176 from bed PO 131, extreme apical part. C–D. Specimen FMNH-P30177, holotype. C. Details of the protoconch. D. Apical part with transition toward juvenile growth stages; note the slightly expanded siphuncular segments. Scale bars: A = 5 mm; B–C = 1 mm; D = 2 mm. : 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 page 41, DOI: 10.5852/ejt.2021.783.1601, http://zenodo.org/record/5793422

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