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Scientific Name: Gyraulus convexiusculus (T. Hutton, 1849)
Synonym: Gyraulus chinensis convexiusculus (Currently unaccepted)
English Name: Horn snail
Local/Bangla Name: ছোট প্যাঁচানো শামুক (Choto pechano shamuk)
Photo: Vladimir Pešić
Classification:
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Order: Basommatophora
Family: Planorbidae
Description:
The shell is small and thin, flattened in a discoidal manner, highly depressed, and exhibits a pale translucent or semi-transparent appearance. It consists of 4-5 distinct whorls without prominent transverse ribs, with the last whorl having a somewhat angular periphery. The periostracum may or may not have short hair-like projections and may or may not feature a peripheral keel. The whorls are clearly defined, and the aperture is ovate-lunate, oblique, and characterized by a simple lip. The overall coloration is yellowish-brown. In terms of size, the shell measures approximately 4 mm in length, 5 mm in width, with an aperture length of 3 mm and an aperture width of 2 mm.
Habitat & Distribution in Bangladesh:
Occurs in natural and artificial ponds, ditches, canals, paddy fields, grasslands, vegetable and flower gardens. It prefers weeds but can equally colonise at ease in the muddy substratum of a transient freshwater habitat. During the dry season this snail migrates to ponds from the temporary water bodies. But in the rainy season when ponds become over-flooded, it migrates towards canals and temporary water bodies (Jahan et al., 2003). Abundant in almost all northern districts of Bangladesh.
Environment:
freshwater