Mulinia levicardo Smith 1881

Mulinia levicardo (Smith, 1881) (Figure 13) Mactra (Mulinia) levicardo Smith, 1881: 39, pl. 5 figs. 2 ��� 2 b. Mactra levicardo Mabille & Rochebrune, 1889: 106. Mulinia laevicardo Carcelles, 1950: 80, 1951: 343. Diagnosis. Lunule and escutcheon not defined, small and weak ventrally projected chondrophore; pallial sinus short, horizontal. Description. Shell oval to subcircular, subequilateral, inflated, with small umbos weakly inflated; external surface smooth with weak concentric ornamentation forming irregular growth lines more visible in the ventral area (Fig. 13 A���B). Anterior and posterior ends rounded, without sharp angles, ventral margin curved; lunule and escutcheon poorly developed, not defined by lines. Internally white; right valve with two strong anterior and posterior lateral teeth with rounded cusps, ventral anterior and posterior more distal from cardinals. Cardinal teeth unfused, posterior one vertically oriented, anterior one oblique (Fig. 13 G). Left valve with V-shaped cardinal tooth flanked on posterior side by an accessory lamella, lateral teeth elongated with rounded cusp (Fig. 13 H); chondrophore small, ventrally poorly developed; pallial sinus short and U-shaped (Fig. 13 C���F). Type material. One complete syntype (NHM Reg. No.1879.10.15.67). Type locality. Cockle Cove, in Magellanic Strait area, at 13 m depth. Other material examined. Argentina. Patagonia (NHM 1829, 1 valve). Chile. Cockle Cove, Magellanic Strait (NHM 79.10.15.68, coll. by Coppinger, 2 valves). Distribution. Magellanic Strait. Remarks. The rareness of this species was revealed by the scarce specimens deposited in the malacological collections examined. In the original description, the author pointed out that only two specimens of this form were sampled during the trip of the H.M.S. ���Alert���.
Published as part of Signorelli, Javier H. & Pastorino, Guido, 2011, Revision of the Magellanic Mactridae Lamarck, 1809 (Bivalvia: Heterodonta), pp. 47-67 in Zootaxa 2757 on pages 60-61, DOI: 10.5281/zenodo.201077
{"references":["Smith, E. A. (1881) Account of the Zoological collections made during the Survey of H. M. S. \" Alert \" in the Magellanic Straits and on the Coast of Patagonia. IV. Mollusca and molluscoidea. Proceedings of the Zoological Society of London, 22 - 44.","Mabille, J. & Rochebrune, A. (1889) Mission Scientifique du Cap Horn. Paris, Gauthier-Villars et fils. 6 Zoologie 2, 143 pp.","Carcelles, A. (1950) Catalogo de los moluscos marinos de Patagonia. Anales del Museo Nahuel Huapi, 2 extra nueva serie, 8, 41 - 100."]}