Cardiidae

:*Baineann an t-alt seo le fine mhór moileasc ina bhfuil thart ar 200 speiceas; má tá suim agat sa speiceas is coitianta ar chóstaí na hÉireann (Cerastoderma edule), féach [[Ruacan coiteann]].*

Is moileasc mara débhlaoscach inite é **ruacan**. Cé go dtugtar “ruacan” ar go leor débhlaoscach inite, is iad na speicis san fhine tacsanomaíochta **Cardiidae** na fíor-ruacain.

Cónaíonn ruacain ar thránna gainimh ar foscadh timpeall an domhain. Bíonn an sliogán cruinn agus siméadrach go déthaobhach, ar dhéanamh croí nuair a bhreathnaítear air ón deireadh. Feictear easnacha gathacha, spásáilte go cothrom, ar an sliogán sa chuid is mó de na géinis; is eisceacht é *Laevicardium*, na ruacain uibhe, a bhfuil sliogáin an-mhín orthu.

Tá an ruacan in ann a shliogán a dhúnadh go hiomlán; is é sin le rá, níl aon “bhearna” idir an dá thaobh. Cé go bhfuil cosúlacht idir sliogán an ruacain agus an muirín mar gheall ar na heasnacha, is féidir iad a idirdhealú ó thaobh moirfeolaíochta de, sa mhéid is nach bhfuil “cluaisíní” (cnapa beaga ar cruth cluaise i ngar don inse) ag an ruacan.

Tugtar an t-ainm “ruacan” ar roinnt speiceas nach bhfuil san fhine Cardiidae; mar shampla, an ruacan con (*Glycymeris glycymeris*), an ruacan croí (*Glossus humanus*), an ruacan cruinneánach (*Sphaerium corneum*), agus an ruacan piseánach (*Pisidium casertanum*). Ar an lámh eile, ní thugtar “ruacan” ar gach speiceas de chuid Cardiidae; mar shampla, is ball den fhine é an breallach mór.

Tá níos mó ná 205 speiceas beo san fhine, agus go leor foirmeacha iontaise eile.

Faightear an ruacan coiteann *(Cerastoderma edule)* go forleathan timpeall chóstaí Thuaisceart na hEorpa, chomh fada siar le hÉirinn, chomh fada ó thuaidh le Muir Barents, chomh fada soir leis an Iorua, agus chomh fada ó dheas leis an tSeineagáil.

## Géinis

* *[[Acanthocardia]]* Gray, 1851
* † *[[Acobaecardium]]* Paramonova, 1986 
* *[[Acrosterigma]]* Dall, 1900
* *[[Adacna]]* Eichwald, 1838
* *[[Afrocardium]]* Tomlin, 1931
* † *[[Agnocardia]]* Stewart, 1930 
* † *[[Aktschagylocardium]]* Danukalova, 1996 
* *[[Americardia]]* Stewart, 1930
* † *[[Andrusovicardium]]* Paramonova, 1986
* † *[[Anechinocardium]]* Hickman, 2015 
* *[[Apiocardia]]* Olsson, 1961
* † *[[Apscheronia]]* Andrusov, 1903 
* † *[[Arcicardium]]* P. Fischer, 1887 
* † *[[Arpadicardium]]* Eberzin, 1947 
* † *[[Austrocardium]]* Freneix & Grant-Mackie, 1978
* † *[[Avicardium]]* V. P. Kolesnikov, 1950 
* † *[[Avicularium (bivalve)|Avicularium]]* Gray, 1853 
* † *[[Aviculocardium]]* Bagdasarian, 1978
* † *[[Bosphoricardium]]* Eberzin, 1947 
* *[[Bucardium]]* Gray, 1853
* † *[[Budmania]]* Brusina, 1897
* † *[[Byssocardium]]* Tournouër, 1882 
* † *[[Caladacna]]* Andrusov, 1917 
* *[[Cardium (bivalve)|Cardium]]* Linnaeus, 1758
* † *[[Caspicardium]]* Astaf'yeva, 1955 
* *[[Cerastoderma]]* Poli, 1795
* † *[[Chartoconcha]]* Andrusov, 1907 
* † *[[Chokrakia]]* S. V. Popov, 2001 
* *[[Ciliatocardium]]* Kafanov, 1974
* *[[Clinocardium]]* Keen, 1936
* *[[Corculum]]* Röding, 1798
* *[[Ctenocardia]]* H. Adams & A. Adams, 1857
* † *[[Dacicardium]]* Papaianopol, 1975 
* *[[Dallocardia]]* Stewart, 1930
* *[[Didacna]]* Eichwald, 1838
* † *[[Didacnoides]]* Astaf'yeva, 1960 
* † *[[Didacnomya]]* Andrusov, 1923 (neamhchinnte)
* † *[[Digressodacna]]* Davitashvili & Kitovani, 1964 
* *[[Dinocardium]]* Dall, 1900
* *[[Discors]]* Deshayes, 1858
* † *[[Diversicostata]]* Vassoevich & Eberzin, 1930 
* † *[[Ecericardium]]* Eberzin, 1947 
* † *[[Eoprosodacna]]* Davitashvili, 1934 
* † *[[Ethmocardium]]* White, 1880
* *[[Europicardium]]* Popov, 1977
* † *[[Euxinicardium]]* Eberzin, 1947 
* *[[Fragum]]* Röding, 1798
* *[[Freneixicardia]]* J. A. Schneider, 2002
* *[[Frigidocardium]]* Habe, 1951
* *[[Fulvia (bivalve)|Fulvia]]* Gray, 1853
* † *[[Gilletella]]* Marinescu, 1973 
* *[[Glans (bivalve)|Glans]]* Megerle von Mühlfeld, 1811
* *[[Goethemia]]* Lambiotte, 1979
* † *[[Goniocardium]]* Vasseur, 1880 
* † *[[Granocardium]]* Gabb, 1869 
* † *[[Habecardium]]* Glibert & van de Poel, 1970
* † *[[Hedecardium]]* Marwick, 1944
* † *[[Hellenicardium]]* S. V. Popov & Nevesskaja, 2000
* *[[Hippopus]]* Lamarck, 1799
* † *[[Horiodacna]]* Stefanescu, 1896 
* *[[Hypanis (bivalve)|Hypanis]]* Pander in Menetries, 1832
* † *[[Integricardium]]* Rollier, 1912 
* *[[Keenaea]]* Habe, 1951
* *[[Keenocardium]]* Kafanov, 1974
* † *[[Korobkoviella]]* Merklin, 1974 
* † *[[Kubanocardium]]* Muskhelishvili, 1965 
* *[[Laevicardium]]* Swainson, 1840
* † *[[Lahillia]]* Cossmann, 1899 
* † *[[Limnodacna]]* Eberzin, 1936 
* † *[[Limnopagetia]]* Schlickum, 1963
* † *[[Limnopappia]]* Schlickum, 1962 
* *[[Lophocardiium]]* P. Fischer, 1887
* † *[[Loxocardium]]* Cossmann, 1886 
* *[[Lunulicardia]]* Gray, 1853
* † *[[Luxuridacna]]* Papaianopol, 1980 
* † *[[Lymnocardium]]* Stoliczka, 1870 
* *[[Lyrocardium]]* Meek, 1876
* *[[Maoricardium]]* Marwick, 1944
* † *[[Merklinicardium]]* S. V. Popov, 1982  (neamhchinnte)
* † *[[Metadacna]]* Eberzin, 1959 
* *[[Microcardium]]* Keen, 1937
* *[[Microfragum]]* Habe, 1951
* † *[[Miricardium]]* Paramonova, 1986 
* *[[Monodacna]]* Eichwald, 1838
* † *[[Moquicardium]]* Eberzin, 1947 
* † *[[Myocardia]]* Vest, 1861  (neamhchinnte)
* † *[[Nargicardium]]* Eberzin, 1947
* *[[Nemocardium]]* Meek, 1876
* † *[[Obsoletiformes]]* Kojumdgieva, 1969
* † *[[Omanidacna]]* Harzhauser & Mandic, 2008 
* † *[[Oraphocardium]]* Eberzin, 1949 
* † *[[Orthocardium]]* Tremlett, 1950 
* † *[[Oxydacna]]* Davitashvili, 1930 
* † *[[Pachydacna]]* Eberzin, 1955 
* † *[[Pannonicardium]]* Stevanović, 1951 
* † *[[Panticapaea]]* Andrusov, 1923 
* *[[Papillicardium]]* Sacco, 1899
* *[[Papyridea]]* Swainson, 1840
* † *[[Papyrocardium]]* Gabuniya, 1953  (neamhchinnte)
* † *[[Paradacna]]* Andrusov, 1909 
* † *[[Parapscheronia]]* Eberzin, 1955 
* *[[Parvicardium]]* Monterosato, 1884
* † *[[Parvidacna]]* Stevanović, 1950 
* † *[[Phyllocardium]]* P. Fischer, 1887 
* † *[[Plagiocardium]]* Cossmann, 1886 
* † *[[Plagiodacna]]* Andrusov, 1903 
* † *[[Plagiodacnopsis]]* Andrusov, 1923 
* † *[[Planacardium]]* Paramonova, 1971 
* † *[[Plicatiformes]]* Kojumdgieva, 1969 
* † *[[Pontalmyra]]* Stefanescu, 1896 
* *[[Pratulum]]* Iredale, 1924
* † *[[Prionopleura]]* Eberzin, 1949
* *[[Procardium]]* ter Poorten & La Perna, 2017
* † *[[Prophyllicardium]]* Jekelius, 1944  (neamhchinnte)
* † *[[Prosochiasta]]* Eberzin, 1959 
* † *[[Prosodacna]]* Tournouër, 1882 
* † *[[Prosodacnomya]]* Eberzin, 1959 
* † *[[Protocardia]]* Beyrich, 1845 
* † *[[Protoplagiodacna]]* Stevanović, 1978
* † *[[Pseudocatillus]]* Andrusov, 1903 
* *[[Pseudofulvia]]* Vidal & Kirkendale, 2007
* † *[[Pteradacna]]* Andrusov, 1907 
* † *[[Raricardium]]* Paramonova, 1986 
* † *[[Replidacna]]* Jekelius, 1944 
* *[[Ringicardium]]*
* † *[[Schedocardia]]* Stewart, 1930 
* † *[[Schirvanicardium]]* Andreescu, 1974 
* *[[Serripes]]* Gould, 1841
* † *[[Stylodacna]]* Stefanescu, 1896 
* † *[[Submonodacna]]* Livental, 1931 
* † *[[Tauricardium]]* Eberzin, 1947 
* *[[Trachycardium]]* Mörch, 1853
* *[[Tridacna]]*  Bruguière, 1797, na ollbhreallaigh
* † *[[Tschaudia]]* Davitashvili & Kitovani, 1964
* † *[[Turcmena]]* G. I. Popov, 1956 
* *[[Trigoniocardium]]*
* *[[Vasticardium]]* Iredale, 1927
* *[[Vepricardium]]* Iredale, 1929
* † *[[Uniocardium]]* Capellini, 1880
* † *[[Yokoyamaina]]* Hayami, 1958 
* † *[[Zamphiridacna]]* Motaş, 1974

## Gallery

Acrosterigma cignorum 003.jpg|
Ctenocardia fornicata 002.jpg|
Ctenocardia virgo 003.jpg|
Trachycardium maculosum 002.jpg|
Fossil Shells in Cardium Formation.jpg|Sliogáin iontaise in Alberta, Ceanada
Vasticardium berschaueri 001.jpg|*Vasticardium berschaueri*


## Tagairtí

Catagóir:Moilisc
Catagóir:Débhlaoscaigh