Marambioraja leiostemma
Engelbrecht, Mors, Reguero & Kriwet, 2019
Classification: Elasmobranchii Rajiformes Rajidae
Reference of the original description
Skates and rays (Elasmobranchii, Batomorphii) from the Eocene La Meseta and Submeseta formations, Seymour Island, Antarctica. Historical Biology, 31(8), 1028–1044
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;
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 12/2024
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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.
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
shark-references Species-ID=15500;
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];
shark-references Species-ID=15500;
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
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
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
