. Bulletin of the British Museum (Natural History). PEBASIAN MOLLUSCAN FAUNAS 259. Figs 284-285 Verena lataguensis sp. nov. Late Caenozoic; Loc. 33/480-560, La Tagua, Colombia; Eden Colin. 284, GG19920, holotype; a, b, front, rear, x 5. 285, GG19921, paratype; a, b, front, rear, x 5. Remarks. Morrison's designation of the type species (1954: 376) was: 'Genotype: {Aylacostoma glabrum Spix)= Ayla- costoma (Aylacostoma) scalare (Wagner) 1827'. Parodiz (1969: 141) follows this almost exactly but attributes the designation to Morrison (1952): this is an abstract of a meeting report which
. Bulletin of the British Museum (Natural History). PEBASIAN MOLLUSCAN FAUNAS 259. Figs 284-285 Verena lataguensis sp. nov. Late Caenozoic; Loc. 33/480-560, La Tagua, Colombia; Eden Colin. 284, GG19920, holotype; a, b, front, rear, x 5. 285, GG19921, paratype; a, b, front, rear, x 5. Remarks. Morrison's designation of the type species (1954: 376) was: 'Genotype: {Aylacostoma glabrum Spix)= Ayla- costoma (Aylacostoma) scalare (Wagner) 1827'. Parodiz (1969: 141) follows this almost exactly but attributes the designation to Morrison (1952): this is an abstract of a meeting report which I have not seen and may be invalid. A previous type designation by Cossmann (1909: 126) was: 'Genotype Aulacostoma scalaris Spix'. This is not accepted here as valid because scalaris - a Wagner name - was not one of the species names originally used in conjunction with Aylacostoma. In any case Melania scalaris Wagner is here regarded as a junior objective synonym of Aylacostoma glabrum Spix. Similar treatment is accorded herein to all other new names proposed by Wagner (1827) for species named by Spix in the illustrations of their joint work. Aylacostoma and Aulacostoma were placed in the syno- nymy of Hemisinus Swainson, 1840, by both Thiele (1929: 201) and Wenz (1939: 718). As Aylacostoma is valid and has priority over Hemisinus, such an arrangement is unaccept- able. One other species, Aylacostoma tuberculata Spix, was originally assigned to the genus, and is the type species of Longiverena Pilsbry & Olsson 1935 (see p. 246). Adams & Adams (1854: 291) listed nine living species, including A. scalare but not A. tuberculata, as belonging to Aylacostoma. In spite of this, the type species is probably the only living representative of the genus. Aylacostoma glabrum Spix, 1827 Figs 286-291 *v 1827 Aylacostoma glabrum Spix: pi. 8, fig. 5. *v 1827 Melania scalaris Wagner: 15. 1854 Aylacostoma scalaris (Wagner) ;A. Adams: 299. 1859 Aylacostoma scalaris (Wagner); Chenu:
Size: 2804px × 891px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorbritishmuseumnaturalhistory, bookcentury1900, bookcoll
