Quadras’s Amphidromus, Amphidromus quadrasi

Paul Callomon/ANS

Academy of Natural Sciences of Drexel University

Academy of Natural Sciences of Drexel University
Philadelphia, PA, United States

The Amphidromus snails of the Philippines and Indonesia are unusual in that - as their name implies - their shells can coil either clockwise or anti-clockwise, sometimes even within the same species. They also vary greatly in color and pattern between localities, often making it difficult to define the species. This color form was named versicolor by Fulton in 1896, but is thought to be a local variant of quadrasi. In common with the myriad other animals of the tropical jungles in their region, the habitats of the Amphidromus snails are seriously threatened by agriculture and mining.


  • Title: Quadras’s Amphidromus, Amphidromus quadrasi
  • Creator: Paul Callomon/ANS

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