Idas sp.

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 : 112

publication ID	https://doi.org/ 10.4202/app.00631.2019
persistent identifier	https://treatment.plazi.org/id/F104879E-3B21-AD2F-F521-77EDFE72FA6E
treatment provided by	Felipe
scientific name	Idas sp.
status

Treatment

Idas sp.

Fig. 2C View Fig .

Material.— One specimen ( NRM Mo187003, L = 4 mm) from the Oligocene Cerro La Salina block 9, northern Peru .

Remarks.—The single specimen consists of RV mostly lacking shell material; it has straight dorsal and ventral margins, a pointed anterior margin, the umbo is positioned at about 10% of the total shell length from the anterior, and imprints of small, taxodont teeth can be seen at the posterior end of the posterodorsal margin. It is too poorly preserved to be identified, but seems to differ from the coeval Idas olympicus from Washington state, USA, by a less anteriorly positioned umbo Kiel and Goedert 2007; Kiel and Amano 2013). Compared to geologically younger small bathymodiolins associated to whale falls in Japan, it differs by having a more modioliform shell and a more anteriorly positioned umbo ( Amano and Little 2005; Amano et al. 2007; Jenkins et al. 2018a). Idas sp. reported from a whale fall at Orciano Pisano in Italy has parallel dorsal and ventral margin unlike the Peruvian specimen, and Idas reported from a Miocene seep deposit at Ca’ Fornace in northern Italy has a more curved shell compared to the Peruvian specimen.