Paraechinorhinus barnesi

WELTON IN PFEIL, 1983


Classification: Elasmobranchii Echinorhiniformes Echinorhinidae

Reference of the original description
WELTON, B.J. (1979)
Late Cretaceous and Cenozoic Squalomorphii of the Northwest Pacific Ocean. PhD, Univ. of California Berkeley, 553 p., 71 fig.



Description by Pollerspoeck, Juergen:

Benediktinerring 34, D-94569 Stephansposching; juergen.pollerspoeck@shark-references.com
Citation: Paraechinorhinus barnesi WELTON IN PFEIL, 1983: In: Database of fossil elasmobranch teeth www.shark-references.com, World Wide Web electronic publication, Version 06/2019

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Distribution Geographic
type locality: LACM Locality 3198, Lake Forest, El Toro, Orange County, California, USA [2517];
other localities: LACM Locality 1945, Leisure World, Laguna Hills, Orange County, California, USA[2517];


Distribution of Echinorhinidae show google map

Distribution Strategraphy
Monterey Formation, Middle Miocene, Luisian [2517]; Monterey, Late Miocene, Clarendonian, Mohnian;

Material
82 teeth (types), 20 teeth referred material (LACM 10490, 3 teeth; LACM 57027, 9 teeth; LACM 116460-116466, 7 teeth; LACM 116471, 1 tooth) [2517];

Description
Original diagnosis WELTON, 1979 (same as for the genus) [2517]: Echinorhinid with well developed dignathic and gradient monognathic heterodonty; disjunct monognathic heterodonty weak with upper and lower antero-laterals and one medial only in the lower antero-laterals and one medial only in the lower dental series; ontogenetic heterodonty indeterminate; mesial cusplets never well developed as Echinorhinus and usually absent; distal cusplets 0 to 1 but almost always absent; cusp of lower antero-laterals narrow based and very erect with strongly concave mesial edge and weakly convex and nearly vertical distal edge; blade short and apically convex in upper antero-laterals and usually meso-distally elongated and low in lowers; median tooth with erect symmetrical cusp situated in center of tooth; central axis of cusp situated over distal half of root in all antero-lateral teeth; transverse ridges and grooves in crown foot absent; lingual crown flexure strong with strongly recurved cusp apex; roots hexanchoid or Echinorhinus-1ike, tabular, rectangular, never bilobate and may become rounded basally on the mesial and distal ends as in Echinorhinus; lingual root face with poorly developed longitudinal protuberance below crown foot; central lingual foramen single, multiple, or absent; transverse groove single, multiple or absent and never continuous from central lingual foramen to basal edge of root.

References
ADNET, S. & GUINOT, G. & CAPPETTA, H. & WELCOMME, J.-L. (2012)
Oldest evidence of bramble sharks (Elasmobranchii, Echinorhinidae) in the Lower Cretaceous of southeast France and the evolutionary history of orbitostylic sharks. (plus Supplementary data). Cretaceous Research, 35: 81–87
DOI: 10.1016/j.cretres.2011.11.021
PFEIL, F.H. (1983)
Zahnmorphologische Untersuchungen an rezenten und fossilen Haien der Ordnungen Chlamydoselachiformes und Echinorhiniformes. Palaeo Ichthyologica, 1: 1–315, 146 fig.
WELTON, B.J. (1979)
Late Cretaceous and Cenozoic Squalomorphii of the Northwest Pacific Ocean. PhD, Univ. of California Berkeley, 553 p., 71 fig.