Pterioidea, Gray, 1847

Simone, Luiz Ricardo L., 2024, New species, misidentifications and problematic taxonomy of some Atlantic South American marine mollusks: a review, Papéis Avulsos de Zoologia 64, pp. 1-104 : 76-77

Superfamily Pterioidea Family Vulsellidae

Genus Electroma Stoliczka, 1871

Electroma electra Simone, Gomes & Molozzi , new species ( Fig. 51 ) https://zoobank.org/ 15E763A7-2599-40C7-B7E3-6281303A64D0

Types: Holotype 166643. Paratype: MZSP 163738, 6 spm, MZSP 164274, 6 spm, from type locality.

Type locality: BRAZIL. Paraíba ; Cabedelo,off, 07°02′41″S 34°47′42″W, ~ 14 m [C. R. Medeiros col., 2022] .

Diagnosis: NE Brazilian species of ~ 5 mm; inclination of ~70°. Dorsal base relatively straight, slightly forming small projections.

Description: Shell of very fragile, translucent walls; about as tall as long; anterior, dorsal and anterior edges of both valves turned to right ( Fig. 51H ), friable. Basic color whitish to light beige, with irregular, coalescent, brown chevrons, of variable distribution and density ( Fig. 51A, B, F, G ). Outline slightly inclined ~70° in relation to longitudinal axis; anterior and ventral edges performing wide rounded arc, blunt beak with slightly concave posterior edge; dorsal edge almost straight, with small protruded umbo located between middle and anterior thirds; dorsal edge forming weak projections in both ends; left valve with subterminal byssal notch ( Fig. 51B, E, D, G ); with dorsal edge bearing 3 successive, small nodes ( Fig. 51E ). Umbo small, pointed, with rounded prodissoconch at tip ( Fig. 51E ). Hinge edentulous, with ligament in its entire extension ( Fig. 51C, D, E ); slightly thick in sub-umbonal area. Inner surface weakly glossy and iridescent, lacking visible nacre ( Fig. 51C, D ). Muscular scar of difficult visualization; scar of posterior adductor and posterior retractor muscle rounded, locat- ed in middle-posterior region.

Etymology: The specific epithet has as inspiration the Latin word electra , which originated the word electricity. This is an allusion to the shell color chevrons, looking like sparce electric rays.

Distribution: From Maranhão to Espírito Santo, Brazil.

Figures

Figure 51. Electroma electra shell of types; (A) Holotype MZSP 166643, right valve,outer view (L 4.8 mm); (B) same, left valve,outer view; (C) same, right valve, inner view; (D) same,left valve,inner view;(E) same,left valve,detail of hinge,inner view,scale:= 0.5 mm; (F-H) Paratype MZSP 164274#1 (L 4.0 mm),right,left and dorsal views.