Pleurotomaria cf. hettangiensis Terquem, 1855

Monari, Stefano, Valentini, Mara & Conti, Maria Alessandra, 2011, Earliest Jurassic patellogastropod, vetigastropod, and neritimorph gastropods from Luxembourg with considerations on the Triassic-Jurassic faunal turnover, Acta Palaeontologica Polonica 56 (2), pp. 349-384 : 365

publication ID

https://doi.org/ 10.4202/app.2010.0098

publication LSID

lsid:zoobank.org:pub:D91ACB86-86DD-4730-B5CA-4FA96152EEBF

persistent identifier

https://treatment.plazi.org/id/03ECFA40-FFA8-1C0E-3F8E-FBBAFE5F00B2

treatment provided by

Felipe

scientific name

Pleurotomaria cf. hettangiensis Terquem, 1855
status

 

Pleurotomaria cf. hettangiensis Terquem, 1855

Fig. 10E View Fig .

Material.— One specimen: MNHNL BR 432−2, Brouch, Upper Hettangian ( Schlotheimia angulata Zone , Schlotheimia complanata Subzone ).

Dimensions.—See Table 2.

Remarks.—The specimen exhibits strong similarities with the material here assigned to Pleurotomaria hettangiensis Terquem, 1855 . These concern the conical shape of the juvenile shell, the narrow ramp, the elements of the ornament, and the shape and position of the selenizone. It differs from the specimens ascribed here to P. hettangiensis in the narrower spiral angle and the slightly less prominent nodes. These differences are probably due to intraspecific variability. However, there are no intermediate morphs in the present material so that we leave species assignment of this specimen open.

The specimen differs from Pleurotomaria wanderbachi Terquem, 1855 in the shape of the juvenile shell. It is conical with flat whorls almost lacking a ramp, whereas in P. wanderbachi it is definitely gradate.

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