| 词条 | Olivella nana |
| 释义 |
| name = Sparkling dwarf olive | image = | image_caption = | regnum = Animalia | phylum = Mollusca | classis = Gastropoda | unranked_superfamilia = clade Caenogastropoda clade Hypsogastropoda clade Neogastropoda | superfamilia = Olivoidea | familia = Olivellidae | subfamilia = | genus = Olivella | subgenus = | species = O. nana | binomial = Olivella nana | binomial_authority = (Lamarck, 1811) [1] | synonyms_ref = [2] | synonyms =
}}Olivella nana, common name the sparkling dwarf olive, is a species of sea snail, a marine gastropod mollusk in the family Olivellidae.[3] TaxonomyOliva nana Lamarck, 1811, described from the coast of Angola, was included in the genus Olivancillaria by Fischer (1887) and later cited by many authors in the same genus (e.g. Dautzenberg 1912, Odhner 1923, Nickles 1950, Klappenbach 1965, Burnay & Conceição 1983, etc.). However, the presence of an operculum excludes it from Olivancillaria. Abbott & Dance (1986) included it in Olivella, which appears to be a more accurate assignation.[3]DescriptionThe length of the shell varies between 10 mm and 20 mm. The color of the shell is dark, shining horn. There is some variation in the coloration in this species which changes from horn to white in some specimens at the point where the whorls of the protoconch and the teleoconch join. In some other specimens the change is continued on the first or second whorl of the teleoconch. The apex is small, flattened, smooth and shining. This is the flattest apex in this genus. The apex consists of 11/2 carinated whorls that are rapidly enlarging. The carina appears on the first half of the first whorl and is very strong. The sutures of both the protoconch and the teleoconch are deeply channeled.[4] DistributionThis species occurs in the Atlantic Ocean from Cape Verdes to West Africa and Angola; in the Indian Ocean off Madagascar. References1. ^Lamarck J.-B. (1811). Détermination des espéces de Mollusques testacés. Ann. Mus. Nat. Paris, vol. 16page(s): Page 326, species 57. 2. ^{{WRMS source|135728|Duclos, P.L. (1840) Histoire Naturelle Génerale et Particuliere de Tous les Genres de Coquilles Univalves Marines a l’état Vivant et Fossile, Publiée par Monographies, Genre Columbella. Didot, Paris, 1 p., 13 pls.|28 April 2010}} 3. ^1 2 {{WRMS species|224393|Olivella nana (Lamarck, 1811)||13 April 2012}} 4. ^[https://www.biodiversitylibrary.org/page/35261267#page/739/mode/1up Modification of the apex in gastropod mollusks, Annals of the New York Academy of Sciences. v9., 1877; p. 689]
External links
7 : Olividae|Gastropods described in 1811|Molluscs of the Atlantic Ocean|Molluscs of the Indian Ocean|Molluscs of Angola|Gastropods of Cape Verde|Fauna of Madagascar |
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