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Scientific Name: Brotia costula (Rafinesque, 1833)
English Name: Brotia snai
Local/Bangla Name: লম্বা শামুক(lomba shamuk), লেজা শামুক( leza shamuk)
Gastropod : Brotia costula

Photo: GBIF

Classification:
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Order: Caenogastropoda
Family: Pachychilidae
Description:
The shell is elongated, conical, and substantial, exhibiting a robust and rough, turret-like structure. The spire is somewhat convex, with an elongated shape and an impressed suture, while the apex is decollated. The body whorl is sizable, slightly convex, and slightly wider, nearly one and a half times the length of the shell’s spire. There are 12-14 whorls, each featuring vertically arranged curved ridges and prominent axial ribs adorned with spines. The shell is dextral and decollated. The aperture is nearly rhomboid, smooth on the inside, with a thin, irregular, and sharp outer lip. The inner lip is thick, smooth, and regular. The lower end of the body whorl is marked with circular ridges. The operculum is oval, thin, and concave on the outer surface, with a basal nucleus. This large aquatic mollusk has a rounded foot at the rear. The head bears one pair of large filiform tentacles and one pair of sessile eyes. The ctenidium is monopectinate. The overall coloration is typically brick red or dark brown, with a purple aperture and a yellowish inner lip.
Habitat & Distribution in Bangladesh:
Occurs in muddy, sandy bottoms of lotic freshwater like vers, canals, streams also stagnant waters. Clean water with lime offers suitable habitat for B. costula. It is mostly found in ponds and flowing streams. Abundant in all over Bangladesh in slow-flowing waters.
Environment:
freshwater
Main References:
Other References:
DNA Barcodes from Bangladesh
GenBank Accession Number:
Other DNA Barcodes & Nucleutide Sequences
Other Information