absalao (4 Ergebnisse)

A new species Olivella (Olivella) arionata is described from shallow waters off southern Brazil. It is recognitable by characters of colour, subsutural bnd, fasciole, and the lack of an operculum. The pillar structure of young forms shows si,ilarities to subgenus Olivina. 1+3 pp., 2+6 figs, 4.

Odostomella carceralis spec. nov. is described from Ilha Grande, Rio de Janeiro State, SE Brazil. The only previous record of a Recent species of this genus from the Western Atlantic concerns O. doliolum. 6 pp., 7 figs, gr. 8.

A new species of Nassarina Dall, 1889, N. thetys sp. nov., is described from the Brazilian seashore, based on shell and radula characters. In the Western Atlantic the species most similar to N. thetys is N. metabrunnea. The new species can be recognized by the comparatively large size of the shell, the spacing between the spiral lines that becomes increasingly wider and the spirals becoming more incrassate towards the aperture. 9 pp., 11 figs, gr. 8.

The species of the genus Turbonilla described from the Brazilian coast are redescribed, based partly on SEM studies. Turbonilla fasciata (d'Orbigny, 1840), T. turris (d'Orbigny, 1840), and T. brasiliensis Clessin, 1902, are confirmed as valid species. T. puncturata Clessin, 1900, is placed in the synonymy of T. rushii Bush, 1899. Type specimens of T. iheringi Clessin, 1900, and T. portoricensis Clessin, 1900, were not located, and these nominal species are considered unrecognizable. The lectotype of T. americana (d'Orbigny, 1840) does not fit the original concept of that taxon, it does not even belong to the Pyramidellidae; it should be replaced by the remaining syntype after a ruling by the International Commission on Zoological Nomenclature. T. dubia (d'Orbigny, 1840) is classified in the genus Finella A. Adams, 1869. T. macaensis spec. nov., which has been determined elswhere as T. fasciata, is described from the northern coast of the state of Rio de Janeiro; it occurs from the Brazilian state of Espírito Santo to the coast of Argentina. 20 pp., 41 figs, gr. 8.