Archingeayia sistaci, Vullo & Cappetta & Néraudeau, 2007
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publication ID |
https://doi.org/ 10.5281/zenodo.13741981 |
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persistent identifier |
https://treatment.plazi.org/id/03A787AC-165E-FFA5-F15C-8241CC12FB0E |
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treatment provided by |
Felipe |
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scientific name |
Archingeayia sistaci |
| status |
gen. et sp. nov. |
Archingeayia sistaci gen. et sp. nov.
Fig. 6A–C View Fig .
Derivation of the name: Species named after Mr. Paul Sistac, geologist, for his valuable assistance in the field.
Holotype: Specimen UM FBN 4 .
Paratypes: Specimens UM FBN 2–3 .
Type locality: Font−de−Benon quarry, Archingeay−Les Nouillers, Charente−Maritime, western France.
Type horizon: Lower Cenomanian, subunit B1, lithological level B1cs.
Material.—Ten teeth. Only known from the type locality.
Diagnosis.—Same as for genus.
Description.—The holotype (UM FBN 4; Fig. 6C View Fig ) has a rather high, triangular cusp, slightly worn at its apex. The labial face is smooth, except the presence of a basal horizontal ridge delimiting a bulge. The medio−labial protuberance is not well developed. The lingual face is more steep in profile view and shows three oblique folds not reaching the apex. There is a distinct basal lingual bulge. The uvula above the root notch is rather well differentiated and bears a weak interlocking hollow. The root is relatively low (about one quarter of the total tooth height). It is slightly narrower than the crown and shows typical triangular lobes in basal view.
Remarks.— Archingeayia gen. nov. is based on isolated oral teeth. The systematic affinities of this new genus thus remains uncertain because of its unique tooth morphology. In the locality of Archingeay−Les Nouillers, Archingeayia gen. nov. occurs in association with Ptychotrygonoides and small teeth of Ptychotrygon spp. However, the presence of a true Sclerorhynchidae is attested by the discovery of numerous small rostral teeth that seem to belong to a single taxon. For the moment, it is reasonable not to attempt to link these rostral teeth to any oral ones.
Teeth of Archingeayia gen. nov. display a particular morphology, with a straight and well cusped triangular crown. However, they are close to some other Cenomanian forms, especially from the Bahariya Formation, Egypt. Werner (1989: pl. 22: 1, 2) incorrectly linked to the rostral teeth of Onchopristis numidus some oral teeth showing clear resemblances with teeth of Archingeayia gen. nov. (well developed cusp; ornamentation pattern). However, these teeth are characterized by their larger size, their root wider than the crown, and by their cusp bent labio−lingually. The set of teeth described by Werner should be assigned to the genus Kiestus , recently defined from the Turonian–Coniacian boundary of Texas ( Cappetta and Case 1999). The teeth of Archingeayia gen. nov. also show affinities with a few teeth (lateral ones) of Baharipristis ( Werner 1989: pl. 29: 2). But, as mentioned above in the “Diagnosis and comparisons”, Baharipristis shows a strong monognathic heterodonty and remains clearly different from Archingeayia gen. nov.
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