Megalolamna serotinus

(Probst, 1879)


Classification: Elasmobranchii Lamniformes Otodontidae

Reference of the original description
Probst, J. (1879)
Beiträge zur Kenntniss der fossilen Fische aus der Molasse von Baltringen. Hayfische. (Schluss). Jahreshefte des Vereins für vaterländische Naturkunde in Württemberg, 35, 127–191

Image of the original description

Megalolamna serotinus Probst, 1879; image of the first description (pl. 2, fig. 83)

Synonyms / new combinations and misspellings
Cretalamna bassanii, Cretolamna bassanii, Lamna bassanii, Megalolamna paradoxodon, Otodus serotinus

Types
Megalolamna serotinus

Megalolamna paradoxodon
Holotype: UCMP: 112146;
Otodus serotinus
Syntype: GPIT: PV-31737; GPIT: PV-31738; GPIT: PV-31739; GPIT: PV-76707;

Images of types

Description:


Citation: Megalolamna serotinus (Probst, 1879): In: Database of fossil elasmobranch teeth www.shark-references.com, World Wide Web electronic publication, Version 12/2024

Please send your images of "Megalolamna serotinus" to info@shark-references.com

Megalolamna serotinus (Probst, 1879), Museo Civico di Storia Naturale di Milano Coll. no. V5858 and 5856 from the lower part of the “Pietra da canton” formation, Monferrato region, Italy, Scale bar: 10 mm. © Jürgen Pollerspöck

Description
Original description after Probst (1879) p. 155-156 [1959]: Otodus serotinus n. sp.
Tafel 2. Figur 82-85.
Wir machen zunächst aufmerksam auf die nach hinten geneigten Zähne Fig. 84 von aussen und Fig. 85 von innen. Die breitlichen von der Hauptspitze sich hinwegneigenden Anhänge tragen den Charakter der Otodontenzähne; sie sind aber von der vorhergehenden Art dadurch verschieden, dass ihre Innenseite kräftig gewölbt ist. Damit verbinden wir die Zähne Fig. 82 von aussen und Fig. 83 von innen als vordere Zähne wegen ihrer auf der Basis aufrecht stehenden Spitze. Sie sind kurz, dabei kräftig. Die Nebenspitzen tragen den gleichen gedrungenen Charakter, den wir bei diesem Geschlechte vorfinden. Ob der beträchtliche Grössenunterschied zwischen Fig. 82 und 83 nur auf einen Altersunterschied hinweise, oder ob auch diesem Geschlecht, wie den andern Lamniden, ein kleinerer Zahn an der dritten Stelle des Oberkiefers zukam, müssen wir anheimgestellt sein lassen.

Emended diagnosis after Pollerspöck & Shimada, 2024 [33493]: Lamniform differing from all known species of otodontids by the following combination of characters: tooth consisting of a sharply-pointed, relatively tall, triangular main cusp, in anterior or anterio-lateral teeth one prominent pair of triangular lateral cusplets, in posterior teeth sometimes a second pair of small, secondary cusplets and strongly bilobed root; main cusp erect, in anterior teeth slightly inclined distally, or gently curved distally, in posterior teeth clearly inclined distally; lingual crown face very convex without ornamentation; labial crown face flat or subtly convex except center of base with weak depression; height and width of each lateral cusplet nearly equal with tendency to point outward; both mesial and distal cutting edges of main cusp and lateral cusplets smooth and razor-like, and continuous from apex to base; main cusp and lateral cusplets nearly erect to gently curved lingually; concave crown base and distinct, chevron-shaped tooth neck on lingual face characterized as a bourlette covered with thin enameloid layer; prominent tooth neck also on labial face in tall teeth, forming rounded ledge with thin enameloid layer that grades into enameloid of main cusp and lateral cusplets; bilobed root with rounded basal tips and moderately tight basal concavity in between; root overall robust but particularly at lingual protuberance that generally exhibits one or two prominent and a few smaller nutritive foramina; root width slightly wider than total crown width; osteodentine tooth histology

Remarks
shark-references Species-ID=16509;


References
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Shimada, K. & Boessenecker, R.W. & Perez, V.J. & Kent, B.W. (2024)
New geographic and stratigraphic occurrences of the enigmatic extinct lamniform shark, Megalolamna (Lamniformes: Otodontidae), from the eastern USA. Historical Biology, in press
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Pollerspöck, J. & Shimada, K. (2024)
The first recognition of the enigmatic fossil shark genus Megalolamna (Lamniformes, Otodontidae) from the lower Miocene of Europe and M. serotinus (Probst, 1879) as the newly designated type species for the genus. Zitteliana, 95, 1–9
DOI: 10.3897/zitteliana.98.131387
Pollerspöck, J. & Shimada, K. (2024)
The first recognition of the enigmatic fossil shark genus Megalolamna (Lamniformes, Otodontidae) from the lower Miocene of Europe and M. serotinus (Probst, 1879) as the newly designated type species for the genus. Zitteliana, 95, 1–9
DOI: 10.3897/zitteliana.98.131387
Pollerspöck, J. & Shimada, K. (2024)
The first recognition of the enigmatic fossil shark genus Megalolamna (Lamniformes, Otodontidae) from the lower Miocene of Europe and M. serotinus (Probst, 1879) as the newly designated type species for the genus. Zitteliana, 95, 1–9
DOI: 10.3897/zitteliana.98.131387
Pollerspöck, J. & Shimada, K. (2024)
The first recognition of the enigmatic fossil shark genus Megalolamna (Lamniformes, Otodontidae) from the lower Miocene of Europe and M. serotinus (Probst, 1879) as the newly designated type species for the genus. Zitteliana, 95, 1–9
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Probst, J. (1879)
Beiträge zur Kenntniss der fossilen Fische aus der Molasse von Baltringen. Hayfische. (Schluss). Jahreshefte des Vereins für vaterländische Naturkunde in Württemberg, 35, 127–191