Revision of the Magellanic Mactridae Lamarck, 1809 (Bivalvia: Heterodonta) Author Signorelli, Javier H. Author Pastorino, Guido text Zootaxa 2011 2757 47 67 journal article 10.5281/zenodo.201077 a54416f9-b710-4b29-9989-ad86ebfcab9e 1175-5326 201077 Genus Darina Gray, 1853 . Type Species: Erycina solenoides King & Broderip, 1832 [by Monotypy] Diagnosis. Shell elongated, very thin, fragile, compressed laterally; siphonal gap at both ends; external ligament small, teeth weak in cardinal area; pallial sinus deep about 1/2 Shell length. Distribution. Bahía Blanca, Argentina , to Puerto Montt, Chile .