Prognathodon sp.
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publication ID |
https://doi.org/ 10.5281/zenodo.13345878 |
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persistent identifier |
https://treatment.plazi.org/id/7D2E87A4-D130-FF91-FC9E-FA0EFD4A44FA |
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treatment provided by |
Felipe |
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scientific name |
Prognathodon sp. |
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Fig. 10 View Fig .
Material.—AsingletoothcrownIGPUWAR−6,abradedan − teriorlyandattheapex,fromtheUpperCampanianopokaat Piotrawin.
Description.—As preserved, this robust, bicarinate tooth crownmeasures39.3mminheight,and22.0mminwidth(at thebase);incrosssectionitissubcircular,withsubequallingual and buccal surfaces. Anterior and posterior carinae are comparatively faint, and apparently of comparable strength (although anterior carina is damaged over almost its entire length, see Fig. 10A View Fig 1 View Fig ). Distally, the posterior carina shows very fine serrations ( Fig. 10A View Fig 3 View Fig ). The crown has a slight posteriorrecurvature, and shows smoothlysurfaced enamel. No facets; ornament consists of very fine striae which become more pronounced at crown mid−height, and which form an anastomosed pattern towards the apex ( Fig. 10B View Fig ).
Discussion.—In showing smoothly surfaced enamel, without facets, an ornament of very fine striae which form an anastomosing (reticulate) pattern near the tip, a slight posteriorrecurvature andsubequal lingualandbuccal surfaces,as well as in being robust and bicarinate, specimen IGPUW AR−6findsagoodmatchinmaterialoflateEarlyCampanian age from the Reims area (Champagne, France), referred to Prognathodon giganteus Dollo,1904 byBardetetal.(1997: figs.2,3).Thoseauthorsstressedthepresenceofthecharacteristic anastomosed ornament near the teeth apex of P. giganteus . The type specimen of P. giganteus (IRScNB R106), from the lower Lower Maastrichtian Belemnella obtusa Zone of the Mons Basin, southern Belgium, reveals thisornamentaswell.Thus,Bardetetal.(1997)consideredit to be diagnostic of P. giganteus . However, J. Martin (personal communication in November 2002) informs us that anastomosing ridges also occur in teeth of Prognathodon overtonii ( Williston, 1897) , and we here prefer only generic assignment for the specimen IGPUW AR−6.
Teeth of Prognathodon solvayi Dollo, 1889a (type IRScNB R33), also from the lower Lower Maastrichtian Belemnella obtusa Zone of the Mons Basin, differ in being only moderately inflated, strongly striated and slightly facetted with 7–8 facets on the buccal surface (Lingham−Soliar and Nolf 1989: figs. 20, 27).
Tooth crowns from the Maastrichtian of Zaire ( Congo), illustratedbyLingham−Soliar(1994b:fig.1e,f)andreferred toascf. Prognathodon giganteus ,differinhavingonlyanterior carinae.
Prognathodon currii Christensen and Bonde, 2002 from the uppermost Campanian of the Negev Desert ( Israel; see Christiansen and Bonde 2002) has large and stout, subconical teeth that are ellipsoid in cross section, with blunt apices and unfacetted enamel with fine anastomosing lines apically; posterior and anterior carinae are well developed.
Teeth of Prognathodon saturator Dortangs et al., 2002 from the Upper Maastrichtian of the Netherlands ( Dortangs et al. 2002) are more compressed, have a stronger lingual recurvature and pronounced posterior and anterior carinae.
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