Acus 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 sea snail

Sea snail

Sea snail is a common name for those snails that normally live in saltwater, marine gastropod molluscs....

s, marine 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...

 Terebridae

Terebridae

The Terebridae, commonly referred to as auger shells or auger snails, are a group or taxonomic family of small to large predatory sea snails, marine gastropod mollusks....

, the auger snails.

The genus name Acus belongs to the Pisces

Pisces

Pisces may refer to:*Pisces , a constellation*Pisces , an astrological sign*Fish , as an obsolete taxonomic term*OZ-09MMS Pisces, a fictional mecha in the Gundam Wing anime...

. Therefore Acus Gray, 1847 is no longer accepted, since it is a junior homonym of Acus Lacépède, 1803. Its accepted name is now Oxymeris

Oxymeris

Oxymeris is a genus of sea snails, marine gastropod mollusks in the family Terebridae, the auger snails.-Species:Species within the genus Oxymeris include:* Oxymeris albida * Oxymeris areolata...

Dall, 1903.

Description

Whorls

Whorl (mollusc)

A whorl is a single, complete 360° revolution or turn in the spiral growth of a mollusc shell. A spiral configuration of the shell is found in of numerous gastropods, but it is also found in shelled cephalopods including Nautilus, Spirula and the large extinct subclass of cephalopods known as the...

 simple, aperture

Aperture (mollusc)

The aperture is an opening in certain kinds of mollusc shells: it is the main opening of the shell, where part of the body of the animal emerges for locomotion, feeding, etc....

 elongate, columella simple and thickened, subsutural band present, often ornamented.

Species

Species within the genus Acus include:

• Acus lineopunctatus Bozzetti, 2008

Species brought into synonymy :

• Acus albidus (Gray, 1834) : synonym of Oxymeris albida (Gray, 1834)
• Acus antarcticus E.A. Smith, 1873 : synonym of Euterebra tristis
  Euterebra tristis
  Euterebra tristis is a species of sea snail, a marine gastropod mollusk in the family Terebridae, the auger snails....
  
  (Deshayes, 1859)
• Acus areolatus (Link, 1807) : synonym of Oxymeris areolata (Link, 1807)
• Acus assimilis Angas, 1867 : synonym of Euterebra tristis
  Euterebra tristis
  Euterebra tristis is a species of sea snail, a marine gastropod mollusk in the family Terebridae, the auger snails....
  
  (Deshayes, 1859)
• Acus bicolor Angas, 1867 : synonym of Euterebra tristis
  Euterebra tristis
  Euterebra tristis is a species of sea snail, a marine gastropod mollusk in the family Terebridae, the auger snails....
  
  (Deshayes, 1859)
• Acus caledonicus (G.B. Sowerby III, 1909) : synonym of Oxymeris caledonica (G.B. Sowerby III, 1909)
• Acus chloratus (Lamarck, 1822) : synonym of Oxymeris chlorata (Lamarck, 1822)
• Acus concavus (Say, 1826) : synonym of Terebra concava
  Terebra concava
  Terebra concava is a species of sea snail, a marine gastropod mollusk in the family Terebridae, the auger snails....
  
  (Say, 1826)
• Acus crenulatus (Linnaeus, 1758) : synonym of Oxymeris crenulata (Linnaeus, 1758)
• Acus dillwynii (Deshayes, 1859) : synonym of Oxymeris dillwynii (Deshayes, 1859)
• Acus dimidiata H. Adams & A. Adams, 1853 : synonym of Acus dimidiatus (Linnaeus, 1758)
• Acus dimidiatus (Linnaeus, 1758) : synonym of Oxymeris dimidiata]] (Linnaeus, 1758)
• Acus dislocatus (Say, 1822) : synonym of [[Terebra dislocata]] (Say, 1822)
• Acus eburnea (Hinds, 1844) : synonym of [[Perirhoe eburnea]] (Hinds, 1844)
• Acus fatua (Hinds, 1844) : synonym of [[Oxymeris fatua]] (Hinds, 1844)
• Acus felinus (Dillwyn, 1817) : synonym of [[Oxymeris felina]] (Dillwyn, 1817)
• Acus maculatus (Linnaeus, 1758): synonym of [[Oxymeris maculata]] (Linnaeus, 1758)
• Acus rushii Dall, 1889 : synonym of [[Terebra rushii]] (Dall, 1889)
• Acus senegalensis (Lamarck, 1822) : synonym of [[Oxymeris senegalensis]] (Lamarck, 1822)
• Acus strigatus (G.B. Sowerby I, 1825) : synonym of [[Oxymeris strigata]] (G.B. Sowerby I, 1825)
• Acus suffusus (Pease, 1889) : synonym of [[Oxymeris suffusa]] (Pease, 1889)
• Acus thaanumi (Pilsbry, 1921) : synonym of [[Oxymeris costellifera (Pease, 1869)
• Acus trochlea (Deshayes, 1857) : synonym of Oxymeris trochlea (Deshayes, 1857)
• Acus troendlei (Bratcher, 1981) : synonym of Oxymeris troendlei (Bratcher, 1981)