{{Short description|Genus of bivalves}} {{Automatic taxobox | fossil_range = {{fossil range|Eocene|Present}} | image = Mactra corallina.jpg | image_caption = ''Mactra stultorum'' | taxon = Mactra | authority = Linnaeus, 1767 |synonyms= * ''Colorimactra'' <small>Iredale, 1929</small> * ''Deikea'' <small>Mayer-Eymar, 1872</small> * ''Mactra (Mactra)'' <small>Linnaeus, 1767·</small> accepted, alternate representation * ''Mactra (Maorimactra)'' <small>Finlay, 1928</small>· accepted, alternate representation * ''Mactra (Nannomactra)'' <small>Iredale, 1930</small>· accepted, alternate representation * ''Nannomactra'' <small>Iredale, 1930</small> * ''Telemactra'' <small>Iredale, 1929</small> * ''Trigonella'' <small>da Costa, 1778</small> | subdivision_ranks = Species | subdivision = See text |display_parents= 3 }}
'''''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.<ref name="WoRMS">MolluscaBase eds. (2021). MolluscaBase. Mactra Linnaeus, 1767. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=138158 on 2021-06-03</ref>
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'' <small>Philippi, 1846</small> * ''Mactra glabrata'' <small>Linnaeus, 1767</small> * ''Mactra glauca'' <small>Born, 1778</small> * ''Mactra grandis'' <small>(Gmelin, 1791)</small> * ''Mactra guidoi'' <small>Signorelli & F. Scarabino, 2010</small> * ''Mactra isabelleana'' <small>d'Orbiginny, 1846</small> * ''Mactra lilacea'' <small>Lamarck, 1818</small> * ''Mactra quadrangularis'' <small>Reeve, 1854</small> * ''Mactra sauliana'' <small>Gray, 1838</small> * ''Mactra stultorum'' <small>(Linnaeus, 1758)</small> * ''Mactra veneriformis'' (シオフキガイ, ''shiofukigai'' in Japanese; ''동죽 조개'' in Korean)
[[Image:Mactra glauca2.jpg|thumb|200px|''Mactra glauca'']] ;Species brought into synonymy: * ''Mactra acutissima'' <small>Cosel, 1995</small>: synonym of ''Scissodesma acutissima'' <small>(Cosel, 1995)</small> * ''Mactra angolensis'' <small>Cosel, 1995</small>: synonym of ''Scissodesma angolensis'' <small>(Cosel, 1995)</small> * ''Mactra discors'' <small>Gray, 1873</small>: synonym of ''Spisula discors'' <small>(Gray, 1837)</small> * ''Mactra inconstans'' <small>Cosel, 1995</small>: synonym of ''Huberimactra inconstans'' <small>(Cosel, 1995)</small> * ''Mactra micronitida'' <small>Cosel, 1995</small>: synonym of ''Scissodesma micronitida'' <small>(Cosel, 1995)</small> * ''Mactra murchisoni'' <small>Deshayes, 1854</small> : synonym of ''Spisula murchisoni'' <small>(Reeve, 1854)</small> * ''Mactra nitida'' <small>Spengler, 1786</small>: synonym of ''Scissodesma nitida'' <small>(Gmelin, 1791)</small> * ''Mactra ordinaria'' <small>(E.A.Smith, 1898)</small> : synonym of ''Maorimactra ordinaria'' <small>(E. A. Smith, 1898)</small> * ''Mactra ovata'' <small>Wood 1828</small> : synonym of ''Paphies australis'' <small>(Gmelin, 1791)</small> * ''Mactra rostrata'' <small>Spengler, 1802</small>: synonym of ''Barymactra rostrata'' <small>(Spengler, 1802)</small> * ''Mactra silicula'' <small>Reeve, 1854</small>: synonym of ''Mactrotoma compressa'' <small>(Spengler, 1802)</small> * ''Mactra tristis'' <small>(Reeve, 1854)</small>: synonym of ''Cyclomactra tristis'' <small>(Reeve, 1854)</small> * ''Mactra vitrea'' <small>Gray, 1837</small>: synonym of ''Huberimactra grayi'' <small>(M. Huber, 2015)</small>
==References== {{Commons category}} {{Reflist}} * {{ITIS |taxon=''Mactra'' |id=80967}}
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Category:Mactridae Category:Bivalve genera