Tellina (Acorylus) rickettsi Coan & Valentich-Scott, 2010

Coan, Eugene V. & Valentich-Scott, Paul, 2010, Three new species of Tellina (Bivalvia, Tellinidae) from the Panamic Province, Zootaxa 2715, pp. 55-58 : 56

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).