Isacrodus marthae
Ivanov, Nestell & Nestell, 2012
Classification: Elasmobranchii Jalodontiformes Jalodontidae
Reference of the original description
New jalodontid chondrichthyans from the Middle Permian of West Texas, USA. Historical Biology, 24(4), 359–368
New jalodontid chondrichthyans from the Middle Permian of West Texas, USA. Historical Biology, 24(4), 359–368
Description:
Citation: Isacrodus marthae Ivanov, Nestell & Nestell, 2012: In: Database of fossil elasmobranch teeth www.shark-references.com, World Wide Web electronic publication, Version 09/2026
Description
Original diagnosis after Ivanov, Nestell & Nestell, 2012 [17291]: As for genus: Small teeth with a tricuspid crown; thick cusps, fused at the base, with round tops, covered by lanceolate ornamentation from three strong cristae on the labial side and by delicate cristae on the lingual side; central cusp narrower than lateral ones but equal in height, with more regular ornamentation; lingually extended base with thick occlusal surface, with a slender groove bearing rows of canal foramina, with one or two prominent, massive labiobasal tubercles.
Original diagnosis after Ivanov, Nestell & Nestell, 2012 [17291]: As for genus: Small teeth with a tricuspid crown; thick cusps, fused at the base, with round tops, covered by lanceolate ornamentation from three strong cristae on the labial side and by delicate cristae on the lingual side; central cusp narrower than lateral ones but equal in height, with more regular ornamentation; lingually extended base with thick occlusal surface, with a slender groove bearing rows of canal foramina, with one or two prominent, massive labiobasal tubercles.
References
Rise and diversification of chondrichthyans in the Paleozoic. Paleobiology, 50(2), 271–284
DOI: 10.1017/pab.2024.1
Fish Microremains from the Cutoff Formation (Roadian, Middle Permian) of the Guadalupe Mountains, West Texas, USA. Micropaleontology, 67(4), 365–402
New jalodontid chondrichthyans from the Middle Permian of West Texas, USA. Historical Biology, 24(4), 359–368
DOI: 10.1080/08912963.2012.662229
Rise and diversification of chondrichthyans in the Paleozoic. Paleobiology, 50(2), 271–284
DOI: 10.1017/pab.2024.1

Fish Microremains from the Cutoff Formation (Roadian, Middle Permian) of the Guadalupe Mountains, West Texas, USA. Micropaleontology, 67(4), 365–402

New jalodontid chondrichthyans from the Middle Permian of West Texas, USA. Historical Biology, 24(4), 359–368
DOI: 10.1080/08912963.2012.662229








