Three new species of Tellina (Bivalvia, Tellinidae) from the Panamic Province Author Coan, Eugene V. genecoan@gmail.com Author Valentich-Scott, Paul text Zootaxa 2010 2010-12-07 2715 55 58 journal article 1175-5326 3D365BB3-B315-4501-8983-BD4AD73032C6 Tellina ( Acorylus ) rickettsi Coan & Valentich-Scott , new species Figures 1 I–L , 2 B Shell ovate; inequilateral, much longer anteriorly (anterior end about 70% of length); posterior slope set off by weak sulcus in each valve; posterior end rounded; lunule shallow, elongate; escutcheon shallow, narrow; sculpture of dense, flat commarginal ribs that become lamellate and less dense posteriorly; commarginal ribs overlain by faint radial striae; right valve with very strong anterior lateral tooth and narrower posterior lateral tooth, the anterior tooth closer to cardinal teeth; pallial sinus merging with ventral edge of anterior adductor muscle scar in both valves. Length to 12 mm [SBMNH]. Type material. SBMNH 149544 , holotype ; length, 11.5 mm; height, 8.5 mm . SBMNH 149593 , 4 paratypes , paired valves; UNSM 1146208, 1 paratype , paired valves ; CAS 184230 , 1 paratype , paired valves ; LACM 3138 , 1 paratype , paired valves . Type locality. Bahía San Carlos , Sonora , México ; 27°56’05”N , 111°03’23”W ; 15–30 m . Distribution. Isla Danzante, Baja California Sur ( 25.8°N ) [SBMNH], and Bahía San Carlos, Sonora ( 27.9°N ) [SBMNH], México , to Isla Rancheria, Golfo de Chiriquí , Panamá ( 7.6°N ) [SBMNH]; 9–60 m [SBMNH]. Etymology. Named after Ed Ricketts, preeminent 20 th century marine biologist of California and Mexico . Comparisons. The western Atlantic T. ( A. ) gouldii Hanley, 1846 , differs in being more inflated, heavier, in having a still shorter posterior end and less prominent sculpture, and a shinier periostracum. It is well figured in Mikkelsen & Bieler (2007: 338–339) .