Proceedings of the First European Crustacean Conference, 1992 Actes de la Première Conférence Européenne sur les Crustacés, 1992 EVOLUTION OF LARVAL DEVELOPMENTAL PATTERNS AND THE PROCESS OF FRESHWATERIZATION IN THE PRAWN GENUS MACROBRACHIUM BATE, 1868 (DECAPODA, PALAEMONIDAE) BY D. R. JALIHAL, K. N. SANKOLLI and SHAKUNTALA SHENOY College of Fisheries, Konkan Agricultural University, Ratnagiri - 415 612, Maharashtra State, India ABSTRACT The inland prawn genus Macrobrachium Bate, 1868, is supposed to have originated from marine ancestors sometime in the beginning of the Pleistocene and since then its members have invaded freshwaters to different degrees. As such, these prawns are found to occupy almost all types of aquatic bodies right from purely marine through estuarine, riverine to impounded waters. Conse- quently, they have evolved various types of developmental patterns. Based on information avail- able on more than 40 species, three basic types of larval developmental patterns can abe recog- nized in this genus viz., Prolonged or Normal Type (with 8 to 20 stages), Partially Abbreviated Type (with 2 or 3 stages) and Completely Abbreviated Type (with only 1 stage). However, there are several species showing transitional developmental patterns. Thus, the process of freshwateriz- ation seems to be still continuing
Crustaceana – Brill
Published: Jan 1, 1993
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