Macoma is a large 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 saltwater clams, 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...

 bivalve mollusks in the family Tellinidae

Tellinidae

Tellinidae is a family of marine bivalve molluscs of the order Veneroida. They live under soft sediments in shallow seas.-Characteristics:Tellinids have rounded or oval, elongated shells, much flattened. The two valves are connected by a large external ligament. The two separate siphons are...

, the tellins.

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...

 (WoRMS), the following species are included as accepted names within the genus Macoma

• Macoma balthica
  Macoma balthica
  Macoma balthica, commonly called the Baltic macoma, Baltic clam or Baltic tellin, is a small saltwater clam, a marine bivalve mollusk in the family Tellinidae ....
  
  (Linnaeus, 1758)
• Macoma biota Arruda & Domaneschi, 2005
• Macoma brevifrons (Say, 1834) - short macoma
• Macoma brota Dall, 1916-b - heavy macoma
• Macoma calcarea (Gmelin, 1791) - chalky macoma
• Macoma cancellata Sowerby
• Macoma carlottensis Whiteaves, 1880 - Charlotte macoma
• Macoma cerina Dall, 1900 - waxy macoma
• Macoma coani Kafanov & Lutaenko, 1999
• Macoma constricta (Bruguière, 1792) - constricted macoma
• Macoma crassula (Deshayes, 1855) - thick macoma
• Macoma cumana (Costa O.G., 1829)
• Macoma dispar
• Macoma dubia (Deshayes, 1854)
• Macoma edentula Spengler
• Macoma extenuata Dall, 1900 - slender macoma
• Macoma georgiana Dell, 1964
• Macoma hokkaidoensis Amano, Lutaenko & Matsubara, 1999
• Macoma inflata
• Macoma lama Bartsch, 1929 - Aleutian macoma
• Macoma limula Dall, 1895 - little-file macoma
• Macoma litoralis Krauss
• Macoma loveni (A. S. Jensen, 1905) - inflated macoma, loven macoma
• Macoma matadoa (Gmelin, 1791)
• Macoma melo (Sowerby G.B. III, 1866)
• Macoma mitchelli Dall, 1895 - Matagorda macoma, mitchell macoma
• Macoma moesta (Deshayes, 1855) - flat macoma
• Macoma pellucida (Philippi, 1843)
• Macoma petalum (Valenciennes, 1827)
• Macoma phenax Dall, 1900 - cheating macoma
• Macoma pseudomera Dall & Simpson, 1901 - mera macoma
• Macoma pulleyi Boyer, 1969 - delta macoma, pulley macoma
• Macoma rousi Sowerby
• Macoma subovata (Sowerby, 1867)
• Macoma tageliformis Dall, 1900 - tagelus macoma
• Macoma tenta (Say, 1834) - elongate macoma
• Macoma torelli (Jensen, 1905) - triangular macoma

According to the Indo-Pacific Molluscan Database, the following species are also included within the genus Macoma

• Macoma blairensis Smith, 1906
• Macoma contabulata (Deshayes, 1855-c)
• Macoma incongrua (Martens, 1865-a)
• Macoma middendorffi Dall, 1884 - Middendorff macoma
• Macoma nasuta
  Macoma nasuta
  Macoma nasuta is a species of bivalve found along the Pacific Ocean coast of North America. It is often found buried in sands of 10 to 20 centimeters in depth. This rounded clam has no radial ribs and is commonly called the bent-nosed clam...
  
  Conrad
  Timothy Abbott Conrad
  Timothy Abbott Conrad was an American geologist, malacologist and carcinologist.- External links :* at Internet Archive...
  
  , 1837 - bent-nose macoma
• Macoma nipponica (Tokunaga, 1906)
• Macoma praetexta (Martens, 1865-a)
• Macoma praemitis (Römer, 1872)
• Macoma tokyoensis Makiyama, 1927
• Macoma scarlatoi Kafanov & Lutaenko, 1997
• Macoma (Psammacoma) candida (Lamarck, 1818 in 1815-22)

The database of 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...

 includes an additional number of species

• Macoma acolasta Dall, 1921 -- morsel macoma
• Macoma dexioptera Baxter, 1977 -- rightwing macoma
• Macoma elimata Dunnill and Coan, 1968 -- beveled macoma, file macoma
• Macoma expansa Carpenter, 1864 -- expanded macoma
• Macoma inconspicua
• Macoma indentata Carpenter, 1864 -- indented macoma
• Macoma inquinata (Deshayes, 1855) -- pointed macoma, stained macoma
• Macoma irus
• Macoma leptonoidea Dall, 1895 -- lepton macoma
• Macoma lipara Dall, 1916 -- sleek macoma
• Macoma obliqua (J. Sowerby, 1817) -- oblique macoma, oval macoma
• Macoma secta (Conrad, 1837) -- white-sand macoma
• Macoma subrosea
• Macoma yoldiformis Carpenter, 1864 -- yoldia macoma