Amimopina Solem, 1964

Sutcharit, Chirasak, Naggs, Fred & Panha, Somsak, 2010, A First Record Of The Family Cerastidae In Thailand, With A Description Of A New Species (Pulmonata: Orthurethra: Cerastidae), Raffles Bulletin of Zoology 58 (2), pp. 251-258 : 255

Amimopina Solem, 1964

Type species. – Bulimus macleayi Brazier, 1876 ; by original designation Solem, 1964a: 118.

Remarks. – Amimopina possesses an ovate conical, small, thin and translucent shell; uniformly corneous or light brownish with thin growth lines on the surface; aperture ovate with a simple peristome ( Solem, 1964a; Schileyko, 1998). Radula teeth are monocuspid and spatulate. The genitalia are typical of cerastids with a short gametolytic sac ( Solem, 1964a; 1973).

Negligible information is available on Amimopina systematics and distribution; the evidence for Schileyko’s (1998) assertion that Amimopina includes two or three species is not clear. Solem (1964a, b; 1973) provided reliable reports of Amimopina from Australia and New Guinea but, primarily owing to the low abundance of these fragile shells and their exhibiting very few taxonomically informative characters, species limits have not been established. Our results and those of Solem (1959a) suggest a close relationship between Rhachistia and Amimopina . The genera are very similar in possessing a conical shell, a simple peristome and spatulate radula, as well as exhibiting a blackish pigment lining in the vagina and bud-shaped gametolytic sac. Only small differences in the thickness and translucence of the shell, in the very fine growth lines and the monochrome corneous to light brown colour separate them.