Sakthivel, M. (1976) Geographical and seasonal distribution of Euthecosomata (Pteropoda, Gastropoda) in the Indian Ocean. Meteor Forschungsergebnisse: Reihe D, Biologie, 23 . pp. 1-22.

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Abstract

Twentyone species of euthecosomes were present in the IIOE collections and most of them were very abundant in the upwelling and divergence areas such as the Somali coast, the South Arabian coast, the areas around India and Ceylon and off Java. The seasonal changes in the above areas were prominent. A gradual reduction in the number of species was found from South to North with the maximum (20) in the West Australian sea and minimum (12) in the northern Arabian Sea. L. lesueuri is named as the indicator of the subtropical watermass, C. globu­losa, the equatorial watermass and C. uncinata, the watermass around Andaman Islands. Ten patterns of distribution were traced with the biohydrographic boundaries at Bab el Mandeb, around Gulf of Oman, off central west coast of India, around 10° N, 10° S and 40° S. A distinct hydrological barrier found around 10° N has not only helped to explain the unique pattern of distribution in the north Indian Ocean but also supports the theory that the faunistic barrier exists in the open ocean.

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