Record of the rare triseriate auger Triplostephanus triseriatus (Gray, 1834) with notes on its distribution along the Indian coast

Abstract

The rare triseriate auger shell Triplostephanus triseriatus (Gray, 1834) is reported from Chennai and is only the fourth report to Indian waters. Shell is extremely elongated, very narrow and sculptured. Spiral ridge is round beaded/ noded in the upper part with whorls of two rows of large beads/nodes and a single row small rounded bead/node at the lower part. Columella yellowish orange in colour. The shell description, characteristics, and information on its earlier records are dealt in detail.