Mactra

Mactra is a large genus of medium-sized marine bivalve mollusks or clams, commonly known as trough shells or duck clams. Mactra is the type genus within the family Mactridae.^[1]

Mactra Temporal range: Eocene–Present PreꞒ Ꞓ O S D C P T J K Pg N
Mactra stultorum
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Bivalvia
Order:	Venerida
Superfamily:	Mactroidea
Family:	Mactridae
Subfamily:	Mactrinae
Genus:	Mactra Linnaeus, 1767
Species
See text
Synonyms
Colorimactra Iredale, 1929 Deikea Mayer-Eymar, 1872 Mactra (Mactra) Linnaeus, 1767· accepted, alternate representation Mactra (Maorimactra) Finlay, 1928· accepted, alternate representation Mactra (Nannomactra) Iredale, 1930· accepted, alternate representation Nannomactra Iredale, 1930 Telemactra Iredale, 1929 Trigonella da Costa, 1778

The word "trough" in the common name refers to the fact that all Mactra shells have a large ligamental pit at the hinge line, which in life contains a large internal ligament. Most bivalves in other families have an external ligament instead.

Species

• Mactra chinensis Philippi, 1846
• Mactra glabrata Linnaeus, 1767
• Mactra glauca Born, 1778
• Mactra grandis (Gmelin, 1791)
• Mactra guidoi Signorelli & F. Scarabino, 2010
• Mactra isabelleana d'Orbiginny, 1846
• Mactra lilacea Lamarck, 1818
• Mactra quadrangularis Reeve, 1854
• Mactra sauliana Gray, 1838
• Mactra stultorum (Linnaeus, 1758)
• Mactra veneriformis (シオフキガイ, shiofukigai in Japanese; 동죽 조개 in Korean)

Mactra glauca

Species brought into synonymy

• Mactra acutissima Cosel, 1995: synonym of Scissodesma acutissima (Cosel, 1995)
• Mactra angolensis Cosel, 1995: synonym of Scissodesma angolensis (Cosel, 1995)
• Mactra discors Gray, 1873: synonym of Spisula discors (Gray, 1837)
• Mactra inconstans Cosel, 1995: synonym of Huberimactra inconstans (Cosel, 1995)
• Mactra micronitida Cosel, 1995: synonym of Scissodesma micronitida (Cosel, 1995)
• Mactra murchisoni Deshayes, 1854 : synonym of Spisula murchisoni (Reeve, 1854)
• Mactra nitida Spengler, 1786: synonym of Scissodesma nitida (Gmelin, 1791)
• Mactra ordinaria (E.A.Smith, 1898) : synonym of Maorimactra ordinaria (E. A. Smith, 1898)
• Mactra ovata Wood 1828 : synonym of Paphies australis (Gmelin, 1791)
• Mactra rostrata Spengler, 1802: synonym of Barymactra rostrata (Spengler, 1802)
• Mactra silicula Reeve, 1854: synonym of Mactrotoma compressa (Spengler, 1802)
• Mactra tristis (Reeve, 1854): synonym of Cyclomactra tristis (Reeve, 1854)
• Mactra vitrea Gray, 1837: synonym of Huberimactra grayi (M. Huber, 2015)