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Scientific Name: Corvospongilla bhavnagarensis
English Name: Freshwater sponge
Local/Bangla Name: Sadupanir sponge(স্বাদুপানির স্পঞ্জ )
sponge : Corvospongilla bhavnagarensis

Photo: Islam MR (2009).

Classification:
Kingdom: Animalia
Phylum: Porifera
Class: Demospongiae
Order: Spongillida
Family: Spongillidae
Description:
The megascleres found in Corvospongilla bhavnagarensis are identified as amphistrongyla. They are relatively short, not overly thick, slightly curved, entirely smooth, and exhibit a terminal swelling. Typically, their dimensions range from 190 to 205 mm in length and 0.01 to 0.18 mm in width. Microscleres, on the other hand, possess microbirotulates characterized by a smooth shaft with a slight curve and four recurved hooks at the terminus. The shaft measures between 0.041 and 0.042 mm in length, with rotules having a diameter of 8-9 mm. Gemmoscleres in this species take the form of amphioxea, featuring a strong point, slight curvature, and a surface covered with short, acute spines. These gemmoscleres typically measure 43-45 mm in length and 4 mm in width. The gemmules, which are spherical and smooth, are loosely attached to the sponge surface. Their foramen is not precisely tubular but appears as a conical projection with a diameter ranging from 5 to 6 mm.
Habitat & Distribution in Bangladesh:
C. bhavnagarensis occurs on the surface of submerged rocks or any hard substratum as periphyton; sedentary in nature in running waters. It is a filter feeder. Its preferred habitat seems to be running streams and rivers. Recently the species has been recorded in Bangladesh from the river Mahananda, a tributary to the Padma. Found in Dhaleshwary riverbank, Austogram, Kishoregonj.
Environment:
Freshwater
Comments:
The species photo is taken upto genus.
Main References:

Kabir SMH, Ahmad M, Ahmed ATA, Rahman AKA, Haque EU, Ahmed ZU, Begum ZNT, Hassan MA, Khondker M (2008) Encyclopedia of Flora and Fauna of Bangladesh, Vol 14. Protozoa- Gastrotricha Asiatic Society of Bangladesh, Dhaka: 335 pp

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