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Taxonomy > Phenacolepadidae > Plesiothyreus Plesiothyreus malonei (Vanatta, 1912) Keen (1971) Sea shells of tropical West America. Marine Mollusks from Baja California to Peru. - p. 361 Skoglund (2002) Panamic province molluscan literature: additions and changes from 1971 through 2000. III Gastropoda. - p. 22 Statistics Frequency rare - 6 localities (3.05 %) Sediment 55 (0 fine >> 100 coarse sediment) Size and comments The literature gives a length of nearly 20mm; beach finds reach 15mm. Images Larger diameter 12.5mm. Taxonomy > Phenacolepadidae > Plesiothyreus