{{Short description|Species of bivalve}} {{Speciesbox | fossil_range = {{fossil range|5.3|0|Pliocene - Recent}} | image = Glycymeris nummaria 01.jpg | image_caption = Right valve of ''Glycymeris nummaria'' | image2 = Glycymeris nummaria 02.jpg | image2_caption = Left valve of ''Glycymeris nummaria'' | genus = Glycymeris | species = nummaria | authority = (Linnaeus, 1758) }}
'''''Glycymeris nummaria''''' is a species of saltwater clam, a marine bivalve mollusc in the family Glycymerididae, the bittersweet clams.
==Synonyms== {{div col|colwidth=22em}} * ''Arca insubrica'' Brocchi, 1814 * ''Arca nummaria'' Linnaeus, 1758 * ''Glycymeris insubrica'' (Brocchi, 1814) * ''Glycymeris violacescens'' (Lamarck, 1819) * ''Pectunculus cor'' Lamarck, 1805 * ''Pectunculus nudicardo'' Lamarck, 1819 * ''Pectunculus obliquatus'' Rayneval & Ponzi, 1854 * ''Pectunculus pilosellus'' Risso, 1826 * ''Pectunculus purpurascens'' M' Andrew, 1854 * ''Pectunculus reticulatus'' Risso, 1826 * ''Pectunculus transversus'' Lamarck, 1819 * ''Pectunculus zonalis'' Lamarck, 1819 {{div col end}}
==Description==
<div align=center> <gallery mode="packed" heights="100"> File:Glycymeris nummaria 04.jpg|Fossil (Quaternary) File:Glycymeris nummaria 03.jpg|Fossil (Pliocene) </gallery> </div align=center>
<div align=center> ''Glycymeris nummaria'' var. ''insubrica''<br> Right and left valve of the same specimen: <gallery mode="packed" heights="100"> File:Glycymeris nummaria 05.jpg|Right valve File:Glycymeris nummaria 06.jpg|Left valve </gallery> </div align=center>
The shell of an adult ''Glycymeris nummaria'' can be as large as {{convert|60|mm}}. It is quite thick, almost circular in shape, with a sculpture of radiating striae and fine concentric lines. The surface is dull and may be dark or pale brown, but also whitish-yellowish. Inside of the shell is glossy, white or pale yellow, often with irregular brown markings.
==Distribution and habitat== This species is widespread from Norway to the Mediterranean Sea. It lives in sandy-muddy gravels offshore to depths of about {{convert|100|m}}.
==References== {{Reflist}} *Melita Peharda, Marija Crnčević, Ivana Bušelić, Chris A. Richardson and Daria Ezgeta-Balić - [http://www.bioone.org/doi/abs/10.2983/035.031.0406 Growth And Longevity of Glycymeris nummaria (Linnaeus, 1758) from the Eastern Adriatic, Croatia]
==External links== * Najdek M., Ezgeta-Balić D., Blažina M., Crnčević M. & Peharda M. (2016). "Potential food sources of ''Glycymeris nummaria'' (Mollusca: Bivalvia) during the annual cycleindicated by fatty acid analysis". ''Scientia Marina'' '''80'''(1): 123-129. {{doi|10.3989/scimar.04267.23A}}. {{Taxonbar|from=Q13643557}}
nummaria Category:Bivalves described in 1758 Category:Animal taxa named by Carl Linnaeus Category:Molluscs of the Mediterranean Sea {{bivalve-stub}}