Myliobatis jugosus
(Leidy, 1876)
Classification: Elasmobranchii Myliobatiformes Myliobatidae
Reference of the original description
Remarks on fossils of the Ashley phosphate beds. Proceedings of the Academy of Natural Sciences of Philadelphia, 28, 86–87
Remarks on fossils of the Ashley phosphate beds. Proceedings of the Academy of Natural Sciences of Philadelphia, 28, 86–87
Types
Myliobatis jugosus
Myliobatis jugosus
Description:
Citation: Myliobatis jugosus (Leidy, 1876): In: Database of fossil elasmobranch teeth www.shark-references.com, World Wide Web electronic publication, Version 12/2024
Description
Original description after Leidy (1876) [1419] (only name), description in Leidy (1877) [1420]:
An isolated median tooth, represented in figures 4, 5, Pl. XXXI, probably indicates a species of eagle ray different from the former. The specimen is likewise from the marl of Vincenttown, Burlington Co., N. J., and was recenly presented to the Academy by Col. T.M. Bryan.
The tooth is transversely nearly straight, and the ends are angular and adapted to the articulation of small hexagonal teeth as in the species of Myliobates generally. The crown forms a thick median transversely convex prominence with the sides extended outwardly and thin. The prominence appears as an exaggeration of the median ridge of the dental plate of M. fastigiatus due to the more abrupt depression of the sides of the crown. The tooth at the median prominence is no thicker than in the smaller of the dental plates described under the name of M. fastigiatus, while it is considerably broader. The triturating surface is transversely convex on the median prominence and becomes nearly flat upon its reflected sides. The dull aspect of the triturating surface, and the comparatively thin condition of the sides of the crown probably indicate some reduction as the result of wearing. The anterior inclining surface of the crown and the projecting posterior surface indicate a somewhat imbricated arrangement of the median teeth. In the specimen the back of the eminence of the crown is unsymmetrical, apparently deformed. The base of the crown opposite the median eminence is concave, and this curvature at the sides is slightly deflected. The root is straight on its attaching surface.
The breadth of the tooth is nearly 2 1/2 inches; its median height 8 ¾ inches, and at the sides 4 lines. The width of the crown fore and aft is about 5 lines, and its thickness at the middle about the same, while at the sides it is but 1 ½ lines.
Original description after Leidy (1876) [1419] (only name), description in Leidy (1877) [1420]:
An isolated median tooth, represented in figures 4, 5, Pl. XXXI, probably indicates a species of eagle ray different from the former. The specimen is likewise from the marl of Vincenttown, Burlington Co., N. J., and was recenly presented to the Academy by Col. T.M. Bryan.
The tooth is transversely nearly straight, and the ends are angular and adapted to the articulation of small hexagonal teeth as in the species of Myliobates generally. The crown forms a thick median transversely convex prominence with the sides extended outwardly and thin. The prominence appears as an exaggeration of the median ridge of the dental plate of M. fastigiatus due to the more abrupt depression of the sides of the crown. The tooth at the median prominence is no thicker than in the smaller of the dental plates described under the name of M. fastigiatus, while it is considerably broader. The triturating surface is transversely convex on the median prominence and becomes nearly flat upon its reflected sides. The dull aspect of the triturating surface, and the comparatively thin condition of the sides of the crown probably indicate some reduction as the result of wearing. The anterior inclining surface of the crown and the projecting posterior surface indicate a somewhat imbricated arrangement of the median teeth. In the specimen the back of the eminence of the crown is unsymmetrical, apparently deformed. The base of the crown opposite the median eminence is concave, and this curvature at the sides is slightly deflected. The root is straight on its attaching surface.
The breadth of the tooth is nearly 2 1/2 inches; its median height 8 ¾ inches, and at the sides 4 lines. The width of the crown fore and aft is about 5 lines, and its thickness at the middle about the same, while at the sides it is but 1 ½ lines.
Remarks
shark-references Species-ID=9037;
synonym of Leidybatis jugosus after Ebersole et al. (2019) p. 140 [27789];
shark-references Species-ID=9037;
synonym of Leidybatis jugosus after Ebersole et al. (2019) p. 140 [27789];
References
Reassessment of historical sections from the Paleogene marine margin of the Congo Basin reveals an almost complete absence of Danian deposits. Geoscience Frontiers, 10(3), 1039-1063
DOI: 10.1016/j.gsf.2018.06.002
Die Neoselachier der Paleokaribik (Pisces: Elasmobranchii). Courier Forschungsinstitut Senckenberg, 119, 1–102
Paleogene sea snakes and elasmobranch fishes of South Kazakhstan. Paleontologitchesky Sbornik, 21, 69–74
Les poissons fossiles du Bas-Congo et des régions voisines. Annales du Musée du Congo Belge, Sér. A (Minéralogie Géologie, Paléontologie), 3, 2(3): 257–568
Les faunes ichthyologiques du Crétacé et du Cénozoïque de l'Angola et de l'Enclave de Cabinda. Leurs affinités paléobiogéographiques. Comunicações dos Serviços Geológicos de Portugal, 38(2), 269–290
Check list of the fossil fishes of New Jersey. Journal of Paleontology, 20(5), 510–513
Contribution à l'étude des faunes ichthyologiques marines des terrains tertiaires de la Plaine Côtière Atlantique et du centre des Etats-Unis. Les synchronismes des formations tertiaires des deux côtés de l'Atlantique. Mémoires de la Société géologique de France, 45(2–4), 1–110
A description of the fossil fish remains of the Cretaceous, Eocene and Miocene formations of New-Jersey. Geological Survey of New Jersey Bulletin, 4: 182 p., 108 fig.
Bibliography and catalogue of the fossil Vertebrata of North America. Bulletin of the United States Geological and Geographical Survey of the Territories, 179, 1–868
Reassessment of historical sections from the Paleogene marine margin of the Congo Basin reveals an almost complete absence of Danian deposits. Geoscience Frontiers, 10(3), 1039-1063
DOI: 10.1016/j.gsf.2018.06.002
Die Neoselachier der Paleokaribik (Pisces: Elasmobranchii). Courier Forschungsinstitut Senckenberg, 119, 1–102
Paleogene sea snakes and elasmobranch fishes of South Kazakhstan. Paleontologitchesky Sbornik, 21, 69–74
Les poissons fossiles du Bas-Congo et des régions voisines. Annales du Musée du Congo Belge, Sér. A (Minéralogie Géologie, Paléontologie), 3, 2(3): 257–568
Les faunes ichthyologiques du Crétacé et du Cénozoïque de l'Angola et de l'Enclave de Cabinda. Leurs affinités paléobiogéographiques. Comunicações dos Serviços Geológicos de Portugal, 38(2), 269–290
Check list of the fossil fishes of New Jersey. Journal of Paleontology, 20(5), 510–513
Contribution à l'étude des faunes ichthyologiques marines des terrains tertiaires de la Plaine Côtière Atlantique et du centre des Etats-Unis. Les synchronismes des formations tertiaires des deux côtés de l'Atlantique. Mémoires de la Société géologique de France, 45(2–4), 1–110
A description of the fossil fish remains of the Cretaceous, Eocene and Miocene formations of New-Jersey. Geological Survey of New Jersey Bulletin, 4: 182 p., 108 fig.
Bibliography and catalogue of the fossil Vertebrata of North America. Bulletin of the United States Geological and Geographical Survey of the Territories, 179, 1–868
