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Three New Species of Macrobrachium Bate, 1868 (Decapoda, Palaemonidae) from the Western Ghats of Kerala State, India

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Three new species of Macrobrachium Bate, 1868, i.e., M. gurudeve, M. jayasreei, and M. kunjuramani, collected from the rivers Kabbini and Bhavani (east flowing rivers of Kerala State) are described here in detail. The most important diagnostic features of the species are: in M. gurudeve, the rostrum is broad with 7-9 upper (2 post-orbital) and 3-5 ventral teeth, characteristically arranged; telson broad, dorsal pairs of spines situated at the distal third, and inner distal pair of spines very short; 2nd cheliped with carpus shorter than chela, and fingers ¾ of palm; appendix masculina with 1 long and 4 short distal spinous setae and 13 and 4 stiff lateral setae in two rows; uropodal exopod without accessory spine. In M. jayasreei, the rostrum is very slender, with 7-8 (1 or 2 post-orbital) and 4-5 ventral teeth, maximum width of the rostrum at the level of 2nd ventral tooth, and distal ventral tooth widely separated from the remaining ones; telson slender with 2 pairs of dorsal spines at distal half, and inner distal pair very long and slender; 2nd pair of pereiopods with carpus longer than chela and fingers about half as long as palm, as well as palm longer than half carpus; appendix masculina with 6 distal, stiff spinous and 9 lateral stiff setae, uropodal exopod without accessory spines. In M. kunjuramani, rostrum broad with 7-9 (2 post-orbital) dorsal and 4-5 ventral teeth, characteristically arranged; cephalothorax shorter than rostrum; telson slender with dorsal spines situated at the distal half, and inner distal pair of spines slender; 2nd pereiopods with carpus longer than chela, fingers half as long as palm; appendix masculina with 3 distal, stiff spinous and 6 lateral stiff setae; uropodal exopod with accessory spine. The colouration of the three species is also described.


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