Periploma hendrickxi Valentich-Scott & Coan

Valentich-Scott, Paul & Coan, Eugene V., 2010, Three new species of Periploma (Bivalvia, Periplomatidae) from the Panamic Province, Zootaxa 2673, pp. 65-68 : 66

Periploma hendrickxi Valentich-Scott & Coan , new species

Figures 2 A–F

Periploma carpenteri Dall, 1896 , auctt., non Periploma carpenteri Dall, 1896: 20 .

Description. Shell subovate to subtrigonal; inequilateral, anterior end slightly longer; both valves moderately inflated; left valve slightly fitting inside right valve; sculpture of irregular commarginal striae and broad commarginal undulations, especially near umbones; without granules or pustules; pallial sinus broad, deep, broadly rounded, extending just to beaks; chondrophore robust, small, projecting ventrally; lithodesma absent. Length to 21 mm [SBMNH].

Type material. SBMNH 83628, holotype, 1 paired valves; length, 20.1 mm; height, 15.7 mm. Paratypes: SBMNH 149600, 5 paired valves, 1 single valve; UNSM 1146205, 1 paired valves; CAS 184228, 1 paired valves; LACM 3135, 1 paired valves.

Type locality. Northeast of Isla Santa Cruz, Baja California Sur, Mexico; 25°24’N, 110°37’W; 1,030 m.

Etymology. Named in honor of Michel E. Hendrickx of the Instituto de Ciencias del Mar y Limnología, Unidad Académica Mazatlán, Sinaloa, Mexico, who has rigorously studied the deep-water benthos of the Golfo de California, and has greatly expanded our understanding of its fauna.

Distribution. Only known from the type locality northeast of Isla Santa Cruz, Baja California Sur, Mexico (25.4°N) [SBMNH]; 1,030 m [SBMNH].

Comparisons. Compared to Periploma planiusculum ( Figures 1 P–R), this new species is more equilateral, lacks granules and has low, broad commarginal undulations. It has been reported as P. (Cricoploma) carpenteri Dall, 1896 ( Figures 2 G–I), but the latter is circular in shape, has a much larger chondrophore, and weaker commarginal sculpture.

Literature. Zamorano et al. (2007, as Periploma carpenteri ).

Figures

FIGURE 2. A – F. Periploma hendrickxi new species, A, C, D, holotype (SBMNH 83628) length = 20 mm, B, E, F, paratype (SBMNH 149600) length = 21 mm. A. Exterior of left valve. B. Interior of left valve. C. Exterior of right valve. D. Dorsal view of both valves joined. E. Hinge of right valve. F. Hinge of right valve. G. Interior of left valve. G – I. Periploma carpenteri Dall, 1896, holotype, USNM 106891 length = 47 mm. G. Interior of right valve. H. Dorsal view of right valve. I. Exterior of left valve.

FIGURE 1. A – G. Periploma skoglundae new species; A – C, E – F, holotype (SBMNH 83429) length = 11 mm. A. Exterior of left valve. B. Interior of left valve. C. Exterior of right valve. D. Dorsal view of both valves joined (paratype SBMNH 149601). E. Hinge of right valve. F. Hinge of left valve. G. Interior of right valve. H – I. Periploma margaritacea (Lamarck, 1801) original illustration from Bruguière (1797: pl. 230, fig. 6 a, b), length = 28 mm. H. Interior of right valve. I. Exterior of right valve. J – O. Periploma kaiserae new species, holotype (SBMNH 149599) length = 15 mm. J. Exterior of left valve. K. Interior of left valve. L. Exterior of right valve. M. Interior of right valve. N. Hinge of right valve. O. Hinge of left valve. P – R. Periploma planiscula Sowerby, 1834, syntype (BMNH 1927.3.4.353) length = 42 mm. P. Exterior of left valve. Q. Interior of left valve. R. Interior of right valve.