Nucula
Genus of bivalves
Nucula genus of very small saltwater clams . They are part of the family Nuculidae .
Fossil records
This genus is very ancient. Fossils are known from the Arenig to the Quaternary (age range: from 478.6 to 0.0 million years ago). Fossils are found in the marine strata all over the world.[ 1]
Fossil valves of Nucula piacentina from Pliocene of Italy
Description
Shells of species within this genus can reach a size of about 30 millimetres (1.2 in). They are equivalve, symmetrical, approximately triangular. The surface has fine concentric growth lines. These clams live in the muddy sand close to the sediment surface at a depth of 20 to 200 meters.[ 2]
Species
Nowadays there are still many species of this genus, which have had virtually no change in the course of time. Species within the genus Nucula include:[ 3]
Nucula annulata Hampson, 1971 Nucula atacellana Schenck, 1939 - cancellate nutclamNucula austrobenthalis Nucula beachportensis Nucula benguelana Nucula brasiliana Nucula calcicola Moore, 1977 - reef nutclamNucula callicredemna Nucula cancellata Meek & Hayden, 1856 Nucula cardara Dall , 1916Nucula carlottensis Dall , 1897 - Charlotte nutclamNucula certisinus Finlay , 1930Nucula chrysocome Nucula consentanea Nucula covra Nucula crassicostata Nucula crassidens Nucula crenulata A. Adams , 1856Nucula crystallina Nucula culebrensis Nucula cymella Dall , 1886Nucula darella Dall , 1916Nucula declivis Nucula delphinodonta Mighels & C. B. Adams, 1842 - dolphintooth nutclamNucula distincta Nucula donaciformis Nucula dorsocrenata Nucula dunedinensis Finlay , 1928Nucula exigua G. B. Sowerby I, 1833 - iridescent nutclam, short nutclamNucula exodonta Nucula faba Nucula falklandica Nucula fernandensis Nucula fernandinae Dall , 1927Nucula gallinacea Finlay , 1930Nucula granulosa Verrill , 1884Nucula groenlandica Posselt, 1898 - Greenland nutclamNucula hanleyi Winckworth, 1931 Nucula hartvigiana Dohrn, 1864 Nucula hawaiensis Nucula inconspicua Nucula insignis Nucula interflucta Nucula iphigenia Nucula irregularis Nucula izushotoensis Nucula kanaka Nucula kerguelensis Nucula libera Nucula malabarica Nucula mariae Nucula marmorea Nucula marshalli Nucula mayi Nucula mesembrina Nucula mitralis Nucula multidentata Nucula nicklesi Nucula nitidosa Winckworth, 1930 (unaccepted name: Nucula turgida Leckenby & Marshall, 1875 )Nucula nitidula A. Adams, 1856 Nucula nitidulaformis Powell , 1971Nucula notobenthalis Nucula nucleus (Linnaeus , 1758 ) Nucula oppressa Nucula papillifera Nucula paulula Nucula percrassa (Conrad , 1858 ) Nucula pisum Nucula planiculmen Nucula praetenta Nucula profundorum Nucula proxima Say , 1822Nucula pseudoexigua Nucula pusilla Nucula recens Dell , 1956Nucula revei Nucula rhytidopleura Nucula rossiana Finlay , 1930Nucula rugulosa Nucula saltator Nucula schencki Nucula sculpturata Nucula semen Nucula semiornata Nucula sericea Nucula striolata Nucula suahelica Nucula subluxa Nucula subovata Verrill & Bush, 1898Nucula sulcata Bronn, 1831 Nucula sultana Nucula surinamensis Nucula tamatavica Nucula tenuis (Montagu, 1808) Nucula tersior Nucula thielei Nucula tokyoensis Nucula torresi Nucula trigonica Nucula tumidula (Malm, 1860) Nucula venezuelana Nucula vincentiana Nucula zophos A. H. Clark, 1960
Extinct species
Extinct species within the genus Nucula include:[ 1]
References
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