Geologica Belgica

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Frederik H. MOLLEN

A partial rostrum of the porbeagle shark Lamna nasus (Lamniformes, Lamnidae) from the Miocene of the North Sea Basin and the taxonomic importance of rostral morphology in extinct sharks

(volume 13 (2010) — number 1-2)
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Annexes

Mots-clés : Lamniformes, Lamnidae, Lamna, rostrum, shark, rostral node, rostral cartilages, CT scans.

Abstract

A fragmentary rostrum of a lamnid shark is recorded from the upper Miocene Breda Formation at Liessel (Noord-Brabant, The Netherlands); it constitutes the first elasmobranch rostral process to be described from Neogene strata in the North Sea Basin. Based on key features of extant lamniform rostra and CT scans of chondrocrania of modern Lamnidae, the Liessel specimen is assigned to the porbeagle shark, Lamna nasus (Bonnaterre, 1788). In addition, the taxonomic significance of rostral morphology in extinct sharks is discussed and a preliminary list of elasmobranch taxa from Liessel is presented.

Pour citer cet article

Frederik H. MOLLEN, «A partial rostrum of the porbeagle shark Lamna nasus (Lamniformes, Lamnidae) from the Miocene of the North Sea Basin and the taxonomic importance of rostral morphology in extinct sharks», Geologica Belgica [En ligne], number 1-2, volume 13 (2010), 61-76 URL : http://popups.ulg.be/1374-8505/index.php?id=3401.

A propos de : Frederik H. MOLLEN

Elasmobranch Research, Meistraat 16, B-2590 Berlaar, Belgium; E-mail: frederik.mollen@telenet.be