Asflapristis cristadentis

Villalobos-Segura, Underwood, Ward & Claeson, 2019


Classification: Elasmobranchii Rajiformes Ptychotrygonidae

Reference of the original description
Villalobos-Segura, E. & Underwood, C.J. & Ward, D.J. & Claeson, K.M. (2019)
The first three-dimensional fossils of Cretaceous sclerorhynchid sawfish: Asflapristis cristadentis gen. et sp. nov., and implications for the phylogenetic relations of the Sclerorhynchoidei (Chondrichthyes). Journal of Systematic Palaeontology, 17(21): 1847–1870

Types
Asflapristis cristadentis
Holotype: NHMUK: PV P75433; Paratype: NHMUK: PV P73925; NHMUK: PV P75428a–e; NHMUK: PV P75429a–d; NHMUK: PV P75431; NHMUK: PV P75432;


Description:


Citation: Asflapristis cristadentis Villalobos-Segura, Underwood, Ward & Claeson, 2019: In: Database of fossil elasmobranch teeth www.shark-references.com, World Wide Web electronic publication, Version 10/2021

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Asflapristis cristadentis gen. et sp. nov., tooth sets of different specimens and disarticulated tooth from the preparation of these specimens. A, tooth set of paratype NHMUK PV P75428a–e. B, C, occlusal view of tooth set of paratype NHMUK PV P75432. D, lingual view and E, labial view of separated tooth of NHMUK PV P75432.

Description
Original diagnose after Villalobos-Segura et al. (2019) p. 1857 [27207]: Sclerorhynchid batoid with estimated total length in excess of 2 metres. Rostrum of uncertain length but robust and apparently lacking enlarged rostral denticles and ‘wood-like’ cartilage. Neurocranium (posterior to nasal capsules) of similar length and width with flattened roof with an anterior fontanelle. Palatoquadrate and Meckel’s cartilages are wide and stout, with a thin outer layer of ‘wood-like’ perichondrium. Second hypobranchial without an anterior process. Synarcual long with well-developed medial crest and dorsally directed lateral stays but does not directly connect to the pectoral girdle. Synarcual lip large and fits within the chondrocranium. Vertebral centra fail to reach the middle of the synarcual. Lateral facet of scapulocoracoid thick and compact and articulates to the pectoral elements. Propterygium, mesopterygium and metapterygium expanded distally and paddle shaped. Dentition relatively homodont, teeth oval in occlusal view and lacking a medial cusp or well-developed uvulae, and with large pulp cavity. Occlusal ornament with a strong transverse ridge with fine and irregular branching ridges, mostly linguo-labial and around margins. A fine ridge along labial edge of occlusal face is present in many teeth. Root low with widely spaced root lobes with rounded basal face.

Remarks
type species of Asflapristis Villalobos-Segura et al., 2019 p. 1857 [27207] by original designation (Art. 68.2 ICZN);

valid after Villalobos-Segura et al. (2019) p. 1857 [27207];


References
Villalobos-Segura, E. & Underwood, C.J. (2020)
Radiation and divergence times of Batoidea. Journal of Vertebrate Paleontology, 40(3), Article e1777147
DOI: 10.1080/02724634.2020.1777147
Villalobos-Segura, E. & Underwood, C.J. & Ward, D.J. & Claeson, K.M. (2019)
The first three-dimensional fossils of Cretaceous sclerorhynchid sawfish: Asflapristis cristadentis gen. et sp. nov., and implications for the phylogenetic relations of the Sclerorhynchoidei (Chondrichthyes). Journal of Systematic Palaeontology, 17(21): 1847–1870
DOI: 10.1080/14772019.2019.1578832