''Iberotrygon'' is an extinct genus of sclerorhynchiform

ray Ray may refer to: Fish * Ray (fish), any cartilaginous fish of the superorder Batoidea * Ray (fish fin anatomy), a bony or horny spine on a fin Science and mathematics * Ray (geometry), half of a line proceeding from an initial point * Ray (g ...

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Cenomanian The Cenomanian is, in the ICS' geological timescale, the oldest or earliest age of the Late Cretaceous Epoch or the lowest stage of the Upper Cretaceous Series. An age is a unit of geochronology; it is a unit of time; the stage is a unit in the s ...

Mosqueruela Formation of Spain. Only the single species ''I. plagiolophus'', is known; it was named and described in 2009. It is known from the holotype MPZ 2005-33, an antero-lateral tooth, and the parartypes MPZ 2005-34, four well-preserved teeth from a single juvenile?, and MPZ 2005-35, an isolated tooth (all found in Sample 4 from Facies 2). The tooth crown of ''Iberotrygon'' is cuspidate, with a well-developed, high, pointed, main cusp that is inclined lingually in teeth of juveniles and adults. The lingual margin of the crown overhangs the root, especially towards the apex. The crown is bulky and well defined, while the crown shoulders are short and low, while contrastingly, the cutting edge is blunt but continuous between the central cusp and crown shoulders. In occlusal view the crown is devoid of distinct transversal crests. However, there is some ornamentation, most notably a longitudinal medio-labial ridge, which sometimes bifurcates basally delimiting the apron. There are conspicuous short vertical ridges at the labial crown base. These vertical ridges occasionally are amalgamated in smaller, probably juvenile teeth forming a short transversal crest similar to those found in ''

Ptychotrygon ''Ptychotrygon'' is a genus of sawfish-like Late Cretaceous ray whose fossils have been found worldwide. It, '' Ptychotrygonoides'', '' Texatrygon'', and '' Asflapristis'' are members of the family Ptychotrygonidae within the suborder Sclerorhyn ...

''. The apron is broad, with a rounded extremity that is bent basally and is detached from the labial contour. The lingual face is fairly steep, and has a well-developed vertical directed uvula, above which is a well-marked central depression. This depression is bordered dorsally by a short and slightly convex transversal crest, which is constrained to the central cusp. The root is low and narrow, with narrow lobes separated by a broad, but deep central groove. There is no basal bulge. The teeth of ''Iberotrygon'' display some sort of ontogenetic variation. According to the available material, teeth of juvenile individuals seemingly differ from adult ones in the presence of amalgamated vertical ridges into short transversal crests and the presence of a vertical labial crest that tends to bifurcate basally in teeth of adults. Teeth of ''Iberotrygon'' resemble those of ''Ptychotrygon'', '' Texatrygon'' and '' Archingeayia'' to some extent but can easily be distinguished from those by the character combination indicated in the diagnosis.Wueringer, B. E., Squire, L., & Collin, S. P. (2009). The biology of extinct and extant sawfish (Batoidea: Sclerorhynchidae and Pristidae). ''Reviews in Fish Biology and Fisheries'', ''19''(4), 445.

References

Fossil taxa described in 2009 Sclerorhynchidae Prehistoric cartilaginous fish genera {{paleo-cartilaginous-fish-stub