The Ashtamudi Lake short-neck clam: re-assigned to the genus Marcia H. Adams & A. Adams, 1857 (Bivalvia, Veneridae) Author Arathi, Anitha R. Author Oliver, P. Graham Author Ravinesh, Raveendhiran Author Kumar, Appukuttannair Biju text ZooKeys 2018 799 1 20 http://dx.doi.org/10.3897/zookeys.799.25829 journal article http://dx.doi.org/10.3897/zookeys.799.25829 1313-2970-799-1 EA97411336B64F57BD7FDFA7B6A3F247 Protapes ziczac (Linnaeus, 1758) Figure 11 Original combination. Venus ziczac Linnaeus, 1758 Synonyms. (from MolluscaBase 2018d ) Venus sinuosa Lamarck, 1818; Tapes inflata Roemer , 1870 Type locality. Linnaeus (1758) gives the type locality as the Indian Ocean. Material examined. Neendakara, Kollam, 5 live collected specimens + 18 empty articulated shells; Dharmadam, Kannur, 3 live collected specimens. Description. Shells to 50 mm, solid, inflated, equivalve, inequilateral, beaks slightly in front of midline. Outline sub-ovate, lunule margin impressed, anterior margin pronounced, posterior ventral margin subtruncate, posterior area strongly sinuous. Lunule lanceolate, weakly ridged. Escutcheon narrow, smooth. Sculpture of raised concentric ridges separated by nearly equal-sized grooves. Pallial sinus narrow, apex rounded , ascending steeply towards umbonal cavity. Shell external colour tan with bright zigzag streaks and four brown rays radiating from umbo to ventral margin. Shell interior colour white with yellowish tinge in umbonal cavity. Distribution. The species has an Indian Ocean distribution with records from the Red Sea, Aden, East Africa, Somalia, Mozambique, Maputo, Inhambane, Nacala, Natal, Madagascar, Oman, and Persian Gulf ( Huber 2010 ). Remarks. Protapes ziczac (Linnaeus, 1758) has an inflated, heavy, and solid shell with the external sculpture the strongest of any species of Protapes . The species was recorded as Protapes sinuosa (Lamarck 1819) by Oliver and Glover (1996) from the Arabian Sea, but has subsequently been shown to be Protapes ziczac (Huber, 2010). Huber (2010) gave P. sinuosa as a junior synonym and also synonymised Tapes inflata Roemer , 1870 with P. ziczac , but Huber (2010) doubted the locality given as Sri Lanka. He regarded the Indo-Pacific shells identified as P. sinuosa as a new taxon, P. swenneni (Huber, 2010). Figure 11. Protapes ziczac A right valve dorsal B right valve ventral C dorsal margin D left valve dorsal E left valve ventral (DABFUK), Kollam, Kerala, South west coast of India.