Caucasochasma zherikhini
Prokofiev & Sychevskaya, 2018
Classification: Elasmobranchii Lamniformes Cetorhinidae
Reference of the original description
Basking Shark (Lamniformes: Cetorhinidae) from the Lower Oligocene of the Caucasus. Journal of Ichthyology, 58(2), 127–138
Basking Shark (Lamniformes: Cetorhinidae) from the Lower Oligocene of the Caucasus. Journal of Ichthyology, 58(2), 127–138
Description:
Citation: Caucasochasma zherikhini Prokofiev & Sychevskaya, 2018: 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 Prokofiev & Sychevskaya, 2018 [26241]: Number of vertebrae roughly 200 or a little more. Centra of all precaudal vertebrae somewhat elongated dorso-ventrally and lack regular concentric calcifications (“annuli”). Lower lobe of caudal fin small; length at least four times in length of upper lobe. Gill rakers up to 50 mm high under full length of fish of approximately 3 m; their apical portions moderately curved at base, medial process of base of middle rakers with moderate length, significantly greater than width of bight, which is usually subangular; angularity of bight greater expressed with larger length of medial process; articular edge of medial process rounded; basal edge varies from rounded to subangular; base high. Dentition unknown.
Original diagnosis after Prokofiev & Sychevskaya, 2018 [26241]: Number of vertebrae roughly 200 or a little more. Centra of all precaudal vertebrae somewhat elongated dorso-ventrally and lack regular concentric calcifications (“annuli”). Lower lobe of caudal fin small; length at least four times in length of upper lobe. Gill rakers up to 50 mm high under full length of fish of approximately 3 m; their apical portions moderately curved at base, medial process of base of middle rakers with moderate length, significantly greater than width of bight, which is usually subangular; angularity of bight greater expressed with larger length of medial process; articular edge of medial process rounded; basal edge varies from rounded to subangular; base high. Dentition unknown.
Remarks
shark-references Species-ID=15053;
type species of Caucasochasma Prokofiev & Sychevskaya, 2018 [26241] by monotypy (Art. 68.3 ICZN);
shark-references Species-ID=15053;
type species of Caucasochasma Prokofiev & Sychevskaya, 2018 [26241] by monotypy (Art. 68.3 ICZN);
References
Oligocene basking sharks (Lamniformes, Cetorhinidae) of the Carpathian Basin with a reconsideration of the role of gill rakers in species diagnostics. Journal of Vertebrate Paleontology, 41(2), Article e1929269
DOI: 10.1080/02724634.2021.1929269
Basking Shark (Lamniformes: Cetorhinidae) from the Lower Oligocene of the Caucasus. Journal of Ichthyology, 58(2), 127–138
DOI: 10.1134/S0032945218020121
Oligocene basking sharks (Lamniformes, Cetorhinidae) of the Carpathian Basin with a reconsideration of the role of gill rakers in species diagnostics. Journal of Vertebrate Paleontology, 41(2), Article e1929269
DOI: 10.1080/02724634.2021.1929269
Basking Shark (Lamniformes: Cetorhinidae) from the Lower Oligocene of the Caucasus. Journal of Ichthyology, 58(2), 127–138
DOI: 10.1134/S0032945218020121
