Olivella (gastropod) Olivella , common name the dwarf olives , is a genus of small predatory sea snails , marine gastropod molluscs in the family Olivellidae , the dwarf olives. Olivella is the type genus of the family.Description Adults in the Olivella species are usually quite small, hence the genus has the common name "dwarf olive". Species of Oliva are usually larger, but there are exceptions. The shell of Olivella usually has a keel-like twist at the anterior end of the columella . The wall above it may be concave or have deep furrows . The inner lip can sometimes show a deep callus, and in many cases this extends over the parietal wall to the end of the aperture. This callus formation may extend to the spire but leave the suture open. Most species of Olivella have a thin, chitinous operculum, but this operculum is lacking in Olivella nivea , as is also the case in species of Oliva .Species Species in the genus Olivella include: Olivella acteocina Olsson, 1956 Olivella alba Olivella alectona - San Pedro dwarf olive Olivella altatae Burch & Campbell, 1963 Olivella amblia Watson, 1882 Olivella anazora Olivella ankeli Diaz & Gotting, 1990 Olivella arionata Absalão, 2000 Olivella aureobalteata Kuroda & Habe, 1971 Olivella aureocincta Carpenter, 1857 Olivella baetica Carpenter, 1864 - beatic dwarf olive Olivella barbenthos Recourt , 1989 Olivella biminiensis Petuch, 2002 Olivella biplicata - purple dwarf olive Olivella bitleri Olsson, 1956 Olivella borealis Golikov, 1967 Olivella broggi Olsson, 1956 Olivella bullula - bubble dwarf olive Olivella careorugula Absalão & Pimenta, 2003 Olivella cocosensis Olsson, 1956 Olivella columba Olivella columellaris Olivella compta Olivella costulata Paulmier, 2007 Olivella cymatilis S. S. Berry , 1963 Olivella dama Olivella dealbata - whitened dwarf olive Olivella defiorei Klappenbach, 1964 Olivella diodocus Olivella dolichomorpha Paulmier, 2007 Olivella drangai Olsson, 1956 Olivella ephamilla Watson, 1882 Olivella esther Olivella exilis Olivella fimbriata Olivella fletcherae S. S. Berry, 1958 Olivella floralia - rice olive Olivella formicacorsii Klappenbach, 1962 Olivella fortunei Olivella fulgurata A. Adams & Reeve, 1850 Olivella fundarugata Weisbord, 1962 Olivella fuscocincta Dall, 1889 Olivella gaylordi Ford, 1894 Olivella gracilis Olivella guayaquilensis Bartsch, 1928 Olivella guildingii Olivella hyphala Absalão & Pimenta, 2003 Olivella inconspicua Olivella intorta Carpenter, 1857 Olivella inusta G. B. Sowerby III , 1915 Olivella japonica Pilsbry, 1910 Olivella kifos Macsotai & Campos, 2001 Olivella klappenbachi Absalão & Pimenta, 2003 Olivella lactea Olivella lanceolata Olivella lepta Olivella lindae Petuch, 1992 : nomen nudum Olivella lineolata Olivella macgintyi Olsson, 1956 Olivella mandarina Olivella marginelloides Paulmier, 2007 Olivella marmosa Olsson & McGinty, 1958 Olivella mayabe Espinosa & Ortega, 1998 Olivella mica : nomen dubium Olivella microspira Paulmier, 2007 Olivella micula Olivella miliacea Olivella miliola Olivella millepunctata Olivella minuta - minute dwarf olive Olivella miriadina Olivella monilifera Olivella moorei Abbott, 1951 Olivella morrisoni Olsson, 1956 Olivella mutica - variable dwarf olive Olivella myrmecoon Dall, 1912 Olivella nana Olivella nivea - snowy dwarf olive Olivella nota Olivella olssoni Altena, 1971 Olivella orejasmirandai Klappenbach, 1986 Olivella parva T. S. Oldroyd, 1921 Olivella pedroana Olivella perplexa Olsson, 1956 Olivella peterseni Olsson, 1956 Olivella petiolita Olivella plana Olivella plata Olivella poppei Bozzetti, 1998 Olivella prefloralia Olsson & Harbison, 1953 Olivella puelcha Olivella pulchella Olivella pulchra Olivella pulicaria Olivella pura Olivella purpurata Olivella pusilla - tiny dwarf olive Olivella rehderi Olsson, 1956 Olivella riosi Klappenbach, 1991 Olivella riverae Olsson, 1956 Olivella rosolina Olivella rotunda Dall, 1889 Olivella rubra Olivella rufifasciatus Olivella santacruzence Castellanos, 1965 & Fernández, 1965 Olivella scurra Olivella semistriata Olivella signata Olivella sphoni Burch & Campbell, 1963 Olivella spreta Gould, 1861 Olivella spretoides Yokoyama, 1922 Olivella stegeri Olsson, 1956 Olivella steveni Burch & Campbell, 1963 Olivella strigata Olivella tabulata Dall, 1889 Olivella tehuelcha Olivella tergina Olivella thompsoni Olsson, 1956 Olivella tunquina Olivella verriauxii Olivella versicolor Olivella vitilia Watson, 1882 Olivella volutella Olivella volutelloides Olivella walkeri S. S. Berry, 1958 Olivella watermani McGinty, 1940 Olivella zanoeta Olivella zonalis ;Species brought into synonymy : Olivella adelae Olsson, 1956: synonym of Olivella lactea Olivella amoni Sterba & Lorenz, 2005: synonym of Janoliva amoni Olivella apicalis Kay, 1979: synonym of Ancillina apicalis Olivella australis Tenison-Woods, 1878: synonym of Parviterebra brazieri Olivella millepunctata Duclos, 1840: synonym of Olivancillaria millepunctata Olivella paxillus Reeve, 1850: synonym of Oliva nitidula Duclos, 1835 Olivella simplex Pease, 1868: synonym of Olivellopsis simplex
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