- Shashikant Ratilal Magare
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Department of Zoology, Zoology Research Laboratory, A.S. Mandals, Arts and Commerce College Trusts, C.H.C. Arts, S.G.P.Comm. & B.B.J.P.Sci. College
Freshwater molluscs exhibit remarkable adaptability, thriving in diverse
habitats and fluctuating climatic conditions. This study reports the first
record of two exotic freshwater snail species, Planorbella trivolvis and
Planorbella pilsbryi, in Maharashtra, India. Surveys conducted during 2016–2017
around the Godavari River in Gangapur, Nasik, revealed the presence of these
species in ponds and slow-moving streams. Specimens were collected and identified
through morphological and taxonomic analyses, with confirmation from the
Zoological Survey of India.
Planorbella trivolvis is characterized by a sinistral, discoidal shell
with a diameter of 16–17 mm and is typically found attached to aquatic vegetation.
The species thrives in lentic environments, tolerating pH levels of 7–8 and
temperatures ranging from 20–28°C. Similarly, Planorbella pilsbryi exhibits
strong ecological adaptability, surviving in muddy, polluted, and desiccated
habitats. Its shell, also sinistral and discoidal, measures 15–17 mm in
diameter. Both species are detritivorous, feeding on algae, decaying organic matter,
and aquatic vegetation.
This study highlights the invasive potential of these alien species, as they were found colonizing local ecosystems alongside native snails. The findings underscore the importance of monitoring molluscan diversity and understanding the ecological impacts of non-native species. As these snails can influence ecosystem dynamics and serve as indicators of environmental changes, further research is imperative to mitigate potential ecological disruptions caused by their introduction.