Shenacanthus vermiformis
Zhu, Li, Ahlberg & Zhu, 2022
Classification:
Reference of the original description
The oldest complete jawed vertebrates from the early Silurian of China. Nature, 609(7929), 954–958
The oldest complete jawed vertebrates from the early Silurian of China. Nature, 609(7929), 954–958
Description:
Citation: Shenacanthus vermiformis Zhu, Li, Ahlberg & Zhu, 2022: In: Database of fossil elasmobranch teeth www.shark-references.com, World Wide Web electronic publication, Version 08/2026
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Description
Original diagnosis after Zhu, Li, Ahlberg & Zhu, 2022 [31363]: Small chondrichthyan, approximately 22 mm from the rostrum to the anal fin. Fusiform body shape; small cranium (~3.5 mm from the rostrum to the shoulder girdle) with blunt rostrum; dentition absent; branchial region posteriorly positioned in relation to the cranium; branchiostegal and hyoidean plates absent, shoulder girdle covered in large dermal plates both dorsally and ventrally, two median dorsal plates, the anterior one smaller and oblate, the posterior one larger and teardrop-shaped, with vermiform ornament; paddle-like pectoral fins lacking fin spine; Anal fin also lacking fin spine. Small, diamond-shaped scales. Small scutes or dermal plates with linear ornament along the dorsal and ventral midlines.
Original diagnosis after Zhu, Li, Ahlberg & Zhu, 2022 [31363]: Small chondrichthyan, approximately 22 mm from the rostrum to the anal fin. Fusiform body shape; small cranium (~3.5 mm from the rostrum to the shoulder girdle) with blunt rostrum; dentition absent; branchial region posteriorly positioned in relation to the cranium; branchiostegal and hyoidean plates absent, shoulder girdle covered in large dermal plates both dorsally and ventrally, two median dorsal plates, the anterior one smaller and oblate, the posterior one larger and teardrop-shaped, with vermiform ornament; paddle-like pectoral fins lacking fin spine; Anal fin also lacking fin spine. Small, diamond-shaped scales. Small scutes or dermal plates with linear ornament along the dorsal and ventral midlines.
Remarks
shark-references Species-ID=16383;
type species of Shenacanthus Zhu, Li, Ahlberg & Zhu, 2022 [31363] by monotypy (Art. 68.3 ICZN);
shark-references Species-ID=16383;
type species of Shenacanthus Zhu, Li, Ahlberg & Zhu, 2022 [31363] by monotypy (Art. 68.3 ICZN);
References
The oldest complete jawed vertebrates from the early Silurian of China. Nature, 609(7929), 954–958
DOI: 10.1038/s41586-022-05136-8
The oldest complete jawed vertebrates from the early Silurian of China. Nature, 609(7929), 954–958
DOI: 10.1038/s41586-022-05136-8
