Isognomon legumen ( Gmelin, 1791: 3339 )

Lam, Katherine, Morton, Brian & Leung, K. F., 2008, Shell-bearing Mollusca (Bivalvia and Gastropoda) from submarine caves in Hong Kong, Journal of Natural History 42 (9 - 12), pp. 927-952 : 936

Isognomon legumen ( Gmelin, 1791: 3339)

( Figure 2L )

Description

Shell length variable but to, 20 mm, irregularly subquadrate, elongate posteroventrally. Both valves quite flat. Umbo situated antero-dorsally, pointed forward. Several ligament pits along the long, straight hinge line. Shell exterior yellowish white with micaceous growth lamellae.

Type locality

‘‘ad insulas Nicobaricas’’ ( Nicobar Islands, Indian Ocean).

Distribution

Indo-Pacific from the Philippines to Japan, Hawaii and the Red Sea. Intertidal to 20 m subtidal, attached to the undersides of boulders, in mussel aggregations, within coral heads and on pilings ( Scott 2003).

Figures

Figure 2. A, Acar plicata, height×length57.2×12.9 mm; B, Arca avellana, heigh- t×length512.2×26.1 mm; C, Lithophaga malaccana, height×length517.7×7.87 mm; D, Modiolus comptus, height×length57.05×4.82 mm; E, Septifer bilocularis, heigh- t×length537.8×19.8 mm; F, Dendostrea crenulifera, height×length53.4×2.4 mm; G and H, Hyotissa sinensis (NHM 20030494), height×length5129×117 mm; I, Spondylus cf. anacanthus, height×length58.31×15.07 mm; J, Anomia chinensis, heigh- t×length52.4×2.4 mm; K, Pinctada martensii, height×length514.48×15.35 mm; L, Isognomon legumen, height×length528×14.77 mm; M, Vulsella vulsella, heigh- t×length564.19×32.96 mm; N, Ephippodonta oedipus, height×length50.51×3.25 mm; O, Mysella compacta, height×length51.84×4.5 mm; P, Claudiconcha japonica, heigh- t×length54.75×5.08 mm; Q, Hiatella orientalis, height×length511.9×13.1 mm.