Retiskenea, Waren and Bouchet, 2001

Kiel, Steffen, Hybertsen, Frida, Hyžný, Matúš & Klompmaker, Adiël A., 2020, Mollusks and a crustacean from early Oligocene methane-seep deposits in the Talara Basin, northern Peru, Acta Palaeontologica Polonica 65 (1), pp. 109-138 : 120-121

Retiskenea ? sp.

Fig. 10 .

Material.— One specimen (PRI 80014) from the Lomitos cherts, numerous specimens (unnumbered specimens housed at NRM) from blocks of the Cerro La Salina seep deposits. All upper Oligocene, Talara Basin, Peru .

Description.—Shell globular, 2.5 evenly convex whorls with fine, dense prosocyrt growth lines; fine spiral lines present on early whorls; spire low, aperture large.

Remarks.—This species is represented by poorly preserved, small specimens only. The illustrated specimen from the Lomitos cherts shows a granular pattern on its protoconch, somewhat similar to that seen on other fossil Retiskenea species (Kiel 2006; Campbell et al. 2008; Kaim et al. 2014), but this feature might just be a preservational artifact. Hence, our assignment to Retiskenea remains tentative; they might as well belong to the Skeneidae or some other vetigastropod group.

The Eocene–Oligocene Retiskenea statura ( Goedert and Benham, 1999) from seep deposits in western Washington has a taller spire than the Peruvian Retiskenea sp. ? ( Goedert and Benham 1999; Kiel 2006) and the two species R. kieli Campbell, Peterson, and Alfaro, 2008 , and R. tuberculata Campbell, Peterson, and Alfaro, 2008 , from Cretaceous seep deposits in California, USA, have a more rapidly expanding whorl profile than the Peruvian Retiskenea sp. ? ( Campbell et al. 2008; Kaim et al. 2014).

Figures

Fig. 10. The possible neomphalid Retiskenea? sp. (PRI 80014) from the early Cenozoic Lomitos cherts seep deposits near Negritos, Talara Basin, northern Peru.