Pararhincodon bilzi
Reinecke & Engelhard, 1997
Classification: Elasmobranchii Orectolobiformes Parascylliidae
Reference of the original description
The selachian fauna from Geschiebe of the Lower Selandian basal conglomerate (Thanetian, Late Paleocene) in the Danish subbasin (Sealand, Scania, Western Baltic Sea). Erratica, 2, 3–45
The selachian fauna from Geschiebe of the Lower Selandian basal conglomerate (Thanetian, Late Paleocene) in the Danish subbasin (Sealand, Scania, Western Baltic Sea). Erratica, 2, 3–45
Description:
Citation: Pararhincodon bilzi Reinecke & Engelhard, 1997: In: Database of fossil elasmobranch teeth www.shark-references.com, World Wide Web electronic publication, Version 12/2024
Description
Original description after Reinecke & Engelhard (1997) p. 13 [2031]: The mesio-distally compressed, needle-like crown lacking cusplets is markedly bent in lingual direction, but only slightly in distal direction. In the lower third of the conical cusp the crown rapidly widens and forms two asymmetric, blunt lobes. The mesial lobe is wider (mesio-distally extended) and longer (in basal-apical direction) than the distal lobe. Between the lobes the crown base forms an inverted u-shaped incision. The lingual crown face is strongly cambered. The labial face is almost flat in its basal part and becomes more convex apically. The labial and lingual crown face is covered by a few sharp, longitudinal folds which start slightly above the root-crown junction and may extend apically to the upper third of the cusp. The most prominent of these folds on the labial face mark the edges of the basal crown lobes. The cutting edges are weak and can be traced from near the apex to the upper half of the crown. The low holaulacorhize root has a flat basal face with a pronounced lingual protuberance and steep lateral surfaces. The basal face shows a marked nutrient groove with a deep central foramen in lingually displaced position. The lateral root surfaces are laced in and each have a pair of large margino-lingual foramina. The tooth may have been located at an anterior position.
Original description after Reinecke & Engelhard (1997) p. 13 [2031]: The mesio-distally compressed, needle-like crown lacking cusplets is markedly bent in lingual direction, but only slightly in distal direction. In the lower third of the conical cusp the crown rapidly widens and forms two asymmetric, blunt lobes. The mesial lobe is wider (mesio-distally extended) and longer (in basal-apical direction) than the distal lobe. Between the lobes the crown base forms an inverted u-shaped incision. The lingual crown face is strongly cambered. The labial face is almost flat in its basal part and becomes more convex apically. The labial and lingual crown face is covered by a few sharp, longitudinal folds which start slightly above the root-crown junction and may extend apically to the upper third of the cusp. The most prominent of these folds on the labial face mark the edges of the basal crown lobes. The cutting edges are weak and can be traced from near the apex to the upper half of the crown. The low holaulacorhize root has a flat basal face with a pronounced lingual protuberance and steep lateral surfaces. The basal face shows a marked nutrient groove with a deep central foramen in lingually displaced position. The lateral root surfaces are laced in and each have a pair of large margino-lingual foramina. The tooth may have been located at an anterior position.
References
The selachian fauna from Geschiebe of the Lower Selandian basal conglomerate (Thanetian, Late Paleocene) in the Danish subbasin (Sealand, Scania, Western Baltic Sea). Erratica, 2, 3–45
The selachian fauna from Geschiebe of the Lower Selandian basal conglomerate (Thanetian, Late Paleocene) in the Danish subbasin (Sealand, Scania, Western Baltic Sea). Erratica, 2, 3–45
