Shell equivalve, inequilateral with beaks very close to the anterior end. Outline modioliform; ligament and dorsal margins distinctly disjunct; dorsal and ventral margins parallel; dorsal margin concave. Sculpture smooth with growth lines. Periostracum bearing hairs.
under the periostracum shades of orange-brown to olive-brown; interior shell with shades of purple.
common size :
shell to 70 mm.
Easy to identify because of the indented dorsal margin, though it can be confused with intermediate forms of M. philippinarum (Hanley, 1843). Further investigation is required to solve the problem.
BIOLOGY / ECOLOGY
Species able to adapt over a large range of environmental parameters; this high tolerance to changes might be a acquired physiological ability inherent to this species or to the Modiolus genus (Bourdelin, 1996). Suspension feeder.
Red Sea habitat intertidal, attached by byssus to rocks, stones and coral debris (Oliver, 1992).