Megasqualus serriculus
(Jordan & Hannibal, 1923)
Classification: Elasmobranchii Squaliformes Squalidae
Reference of the original description
Fossil sharks and rays of the Pacific slope of North America. Bulletin of the Southern California Academy of Sciences, 22, 27–63, pl. 1–10
Fossil sharks and rays of the Pacific slope of North America. Bulletin of the Southern California Academy of Sciences, 22, 27–63, pl. 1–10
Types
Megasqualus serriculus
Megasqualus serriculus
Description:
Citation: Megasqualus serriculus (Jordan & Hannibal, 1923): In: Database of fossil elasmobranch teeth www.shark-references.com, World Wide Web electronic publication, Version 04/2025
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Description
Original diagnose after Jordan & Hannibal (1923) p. 58 [1250]: Squalus serriculus Jordan and Hannibal, new species.
(Plate III. q. r.)
Teeth small, compressed, shaped like a cocks-comb with a single posterior cone; one margin forming the functional cutting edge, outer edge very finely serrulate; base of tooth thin, with a tubercle cf enamel that extends down over the front of the root, as in Squalus acanthias. Lower teeth longer than upper. We have numerous specimens of this species which is distinguished from the living Squalus suckleyi of the coast by the finely serrulate teeth which have however precisely the same form. In all other Squalidae, the teeth are entire.
Type, (lower tooth) height 6 mm., length of base, 11.5 mm., depth 2.5 mm.; cotype, (upper tooth) height 6 mm., length 8 mm., thickness 2.5 mm.
Shark-tooth Hill (Morrice) type (S. U. 937); Bena, (S. U. 939).
This is the first fossil of this family found in American deposits and the few recorded from Europe are all more or less doubtful.
Original diagnose after Jordan & Hannibal (1923) p. 58 [1250]: Squalus serriculus Jordan and Hannibal, new species.
(Plate III. q. r.)
Teeth small, compressed, shaped like a cocks-comb with a single posterior cone; one margin forming the functional cutting edge, outer edge very finely serrulate; base of tooth thin, with a tubercle cf enamel that extends down over the front of the root, as in Squalus acanthias. Lower teeth longer than upper. We have numerous specimens of this species which is distinguished from the living Squalus suckleyi of the coast by the finely serrulate teeth which have however precisely the same form. In all other Squalidae, the teeth are entire.
Type, (lower tooth) height 6 mm., length of base, 11.5 mm., depth 2.5 mm.; cotype, (upper tooth) height 6 mm., length 8 mm., thickness 2.5 mm.
Shark-tooth Hill (Morrice) type (S. U. 937); Bena, (S. U. 939).
This is the first fossil of this family found in American deposits and the few recorded from Europe are all more or less doubtful.
Remarks
shark-references Species-ID=13195;
shark-references Species-ID=13195;
References
Fossil record and origin of squaliform sharks (Chondrichthyes, Neoselachii). In Gallucci, V.F. & McFarlane, G.A. & Bargmann, G.G. (Eds). Biology and management of dogfish sharks. American Fisheries Society. Bethesda, Maryland: 19–38
Megasqualus serriculus Jordan and Hannibal (Squalidae: Squaliformes: Elasmobranchii) from the Middle Miocene Nanao Calcareous Sandstone, Nanao City, Noto Peninsula, Central Japan. Bulletin of the Mizunami Fossil Museum, 18, 33–45
Fossil record and origin of squaliform sharks (Chondrichthyes, Neoselachii). In Gallucci, V.F. & McFarlane, G.A. & Bargmann, G.G. (Eds). Biology and management of dogfish sharks. American Fisheries Society. Bethesda, Maryland: 19–38
Megasqualus serriculus Jordan and Hannibal (Squalidae: Squaliformes: Elasmobranchii) from the Middle Miocene Nanao Calcareous Sandstone, Nanao City, Noto Peninsula, Central Japan. Bulletin of the Mizunami Fossil Museum, 18, 33–45
