Marambioraja leiostemma

ENGELBRECHT, MORS, REGUERO & KRIWET, 2019


Classification: Elasmobranchii Rajiformes Rajidae

Reference of the original description
ENGELBRECHT, A. & MORS, T. & REGUERO, M.A. & KRIWET, J. (2019)
Skates and rays (Elasmobranchii, Batomorphii) from the Eocene La Meseta and Submeseta formations, Seymour Island, Antarctica. Historical Biology, 31 (8): 1028-1044

Types
Marambioraja leiostemma
Holotype: NRM-PZ: P16257; Paratype: NRM-PZ: P16257; NRM-PZ: P16257; NRM-PZ: P16257; NRM-PZ: P16257; NRM-PZ: P16257; NRM-PZ: P16257;


Description:


Citation: Marambioraja leiostemma ENGELBRECHT, MORS, REGUERO & KRIWET, 2019: In: Database of fossil elasmobranch teeth www.shark-references.com, World Wide Web electronic publication, Version 05/2021

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Description
Original diagnose after Engelbrecht et al. (2019) p. 1035 [27541]: Extinct rajid only known by isolated teeth, which are characterized by the following combination of characters; small teeth (approximately 1 mm in width); crown as wide as the root; pyramidal rather low crown, with nearly smooth labial and lingual surface; labial protuberance more pronounced in lateral teeth and slightly pointing downwards; knob-like labial protuberance with flat oval structure centred on the labial face of the protuberance; cutting edges do not reach base of the crown in anterior teeth; smooth occlusal crown face in anterior teeth; lateral teeth have two transversely directed ridges on the occlusal surface; uvula lacking in all tooth positions; basal edge of the lingual crown face slightly triangular; root lobes well separated by a broad and deep furrow; edges of basal root lobe base rounded and some widened at their lower parts; basal root face slightly convex.

Remarks
type species of Marambioraja Engelbrecht et al., 2019 p. 1035 [27541] by original designation (Art. 68.2 ICZN);

valid after Engelbrecht et al. (2019) p. 1035 [27541];


References
ENGELBRECHT, A. & MORS, T. & REGUERO, M.A. & KRIWET, J. (2019)
Skates and rays (Elasmobranchii, Batomorphii) from the Eocene La Meseta and Submeseta formations, Seymour Island, Antarctica. Historical Biology, 31 (8): 1028-1044
DOI: 10.1080/08912963.2017.1417403