Acirsa is a genus

Genus

In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...

 of predatory sea snail

Snail

Snail is a common name applied to most of the members of the molluscan class Gastropoda that have coiled shells in the adult stage. When the word is used in its most general sense, it includes sea snails, land snails and freshwater snails. The word snail without any qualifier is however more often...

s, marine

Marine (ocean)

Marine is an umbrella term. As an adjective it is usually applicable to things relating to the sea or ocean, such as marine biology, marine ecology and marine geology...

 prosobranch gastropod mollusks in the family

Family (biology)

In biological classification, family is* a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, class, order, genus, and species, with family fitting between order and genus. As for the other well-known ranks, there is the option of an immediately lower rank, indicated by the...

 Epitoniidae, commonly known as wentletraps.

Species

According to the World Register of Marine Species

World Register of Marine Species

The World Register of Marine Species is a database that hopes to provide an authoritative and comprehensive list of names of marine organisms. The content of the registry is edited and maintained by scientific specialists on each group of organism. These taxonomists control the quality of the...

, the following species with valid names are included within the genus Acirsa :

• Acirsa amara Kilburn, 1985
• Acirsa antarctica (Smith, 1907)
• Acirsa borealis (Lyell, 1841) - chalky wentletrap, Okhotsk wentletrap
• Acirsa cerralvoensis (DuShane, 1970)
• Acirsa chitaniana (Yokoyama, 1926)
• Acirsa coarctata (Jeffreys, 1884)
  • Acirsa coarctata coarctata (Jeffreys, J.G., 1884)
  • Acirsa coarctata distantespirata Nordsieck, F., 1972
• Acirsa morsei (Yokoyama, 1926)
• Acirsa murrha (DuShane, 1970)
• Acirsa ochotensis (Middendorff, 1848)
• Acirsa sarsii Kobelt, 1903
• Acirsa subdecussata (Cantraine, 1835)
• Acirsa symphylla (Martens, 1878)

The following species are also named by ITIS

Itis

Itis may refer to* Integrated Taxonomic Information System, a partnership designed to provide consistent and reliable information on the taxonomy of biological species...

 and in the book New Zealand Mollusca, by A. Powell

• Acirsa americana Wade, B., 1926
• Acirsa bezanconi Boury, E.A. de, 1883
• Acirsa clathrata Sohl, N.F., 1964
• Acirsa cookiana (Dell, R.K., 1956)
• Acirsa cretacea (Wade, B., 1917)
• Acirsa culmosa Sohl, N.F., 1964
• Acirsa elatum (Suter, H., 1917)
• Acirsa entrichti Nordsieck, F., 1968
• Acirsa eschrichti Hölboll, 1842
• Acirsa flexicostata Sohl, N.F., 1964
• Acirsa gravida Sohl, N.F., 1964
• Acirsa implexa Sohl, N.F., 1964
• Acirsa microstriata Wade, B., 1917
• Acirsa otogoensis Stilwell, J.D., 1994
• Acirsa pelagica (Risso, A., 1826)
• Acirsa subcarinata
  Acirsa subcarinata
  Acirsa subcarinata is a species of minute deep water sea snail or micromollusk. It is a wentletrap in the family Epitoniidae, a marine gastropod mollusk.This species is distributed along New Zealand.-References:...
  
  Murdoch, R. & H. Suter, 1906
• Acirsa turrita Parona, 1894
• Acirsa undulata Möller, H.P.C., 1844
• Acirsa vayssierei
• Acirsa wadei Cossmann, A.E.M., 1925

Species brought into synonymy :

• Acirsa berryi : synonym of Couthouyella menesthoides (Carpenter, 1864)
• Acirsa corsicana Nordsieck F., 1974 : synonym of Acirsa subdecussata (Cantraine, 1835)
• Acirsa costulata : synonym of Acirsa borealis (Lyell, 1841)
• Acirsa exopleura : synonym of Opalia exopleura (Dall, 1917)
• Acirsa gracilis : synonym of Periapta pandion (Clench & Turner, 1952)
• Acirsa martensi : synonym of Acirsa chitaniana (Yokoyama, 1926)
• Acirsa menesthoides : synonym of Couthouyella menesthoides (Carpenter, 1864)
• Acirsa undulata : synonym of Acirsa borealis (Lyell, 1841)

Some new species (Acirsa alpha, Acirsa beta, Acirsa delta, and Acirsa epsilon) have been named by Squires and Saul in 2003