Mollusks and a crustacean from early Oligocene methane-seep deposits in the Talara Basin, northern Peru Kiel, Steffen Hybertsen, Frida Hyžný, Matúš Klompmaker, Adiël A. Acta Palaeontologica Polonica 2020 2019-12-06 65 1 109 138 7Q8DX Kiel & Hybertsen & Hyžný & Klompmaker, 2020 Kiel & Hybertsen & Hyžný & Klompmaker 2020 [98,297,310,338] Gastropoda Hokkaidoconchidae Ascheria Animalia 19 128 Mollusca species salina sp. nov.   Zoobank LCID: urn:lsid:zoobank.org:act: 6BDCBE13-9DA3-4AF0- 9366-20014BEA1241  Etymology: For the typelocality at Cerro La Salina.  Type material:  Holotype: NRMMo187061.  Paratypes: NRM Mo187059 from Cerro La Salinablock 2 and NRM Mo187060 from Cerro La Salinablock 1.    Typelocality: Cerro La Salinablock 1, Talara Basin, Peru.   Typehorizon: Presumably the early Oligocene part of the Heath shale.  Material.— The typematerial and a few unnumbered fragments from Cerro La Salinablock 1.  Dimensions.—  Holotype( NRMMo187061, H = 22 mm, W = 9 mm) with missing early whorls; fragmentary paratype NRMMo187060) W = 11.5 mm.  Diagnosis.—Small-sized  Ascheriawith blunt axial ribs that are opisthocline in lower part of whorls, a weak subsutural incision, and fine spiral incision in early whorls.  Description.—Medium-sized, high-spired cerithiform shell, at least seven slightly convex whorls. Sculpture consists of blunt axial ribs that are straight or slightly oblique in upper half of whorls and become increasingly opisthocline in lower half; ribs have subsutural constriction and blunt tubercles may develop above and below that constriction; early whorls have fine spiral incision but these disappear on whorls wider than 3 mm, later whorls with faint spiral threads; base is smooth except for opisthocyrt growth lines. Aperture appears to be elongate-oval.  Remarks.—  Ascheria salina sp. nov.differs from  A. elenensisby the shape of the axial ornament, which is strongly opisthocline just below the suture in  A. elenensis, whereas the ribs become opisthocline only in the lower half of the whorl in  A. salina. Furthermore,  A. elenensisgrows to a much larger size and appears to be higher spired (having a narrower apical angle) and  A. salinahas a higher whorl profile than  A. elenensis. The Late Jurassic typespecies  A. giganteadiffers from  A. salinaby having spiral ornament also on large whorls, whereas in  A. salinasuch spirals are only present on very early whorls ( Kaim et al. 2014).  Ascheria? sp. from Barbados(including the specimens reported as “cerithid sp.” by Kugler et al. (1984: pl. 7: 6–8), and as  Abyssochrysossp.by Gill et al. (2005: fig. 5D) has more oblique or sloping axial ribs and spiral ornament is also present on large specimens, in contrast to  A. salina. As  Ascheria? sp. from Barbadosis most likely of Eocene age ( Kiel and Hansen 2015), the early Oligocene Peruvian  Ascheria salinais currently the youngest member of the genus; it is also the smallest species of  Ascheria.  Stratigraphic and geographic range.— Typelocality and horizon only. [256,540,498,519] NRM 19 128 1 holotype NRM Mo Cerro La Salina 19 128 1 paratype [98,653,591,612] Peru Cerro La Salina Talara Basin 19 128 1 holotype Cerro La Salina 19 128 1 NRM 19 128 2 holotype