Ostracolethidae Simroth, 1901
Morphology:
External: Large, high visceral hump (Schilekyo 2003).
Internal: Flat internal shell; little or no flagellum on epiphallus; none to two short appendices on epiphallus; penial retractor muscle joined to epiphallus; small, conic verge in penis; no sarcobelum on atrium (Schilekyo 2003). .
Distribution:
N India, N Vietnam (Schilekyo 2003).