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ON A NEW SPECIES OF MACROBRACHIUM (DECAPODA, PALAEMONIDAE) FROM ITHIKKARA RIVER, SOUTH-WEST COAST OF INDIA

V. UNNIKRISHNAN, P. M. PILLAI and K. V. JAYACHANDRAN
Crustaceana
Vol. 83, No. 9 (September 2010), pp. 1115-1123
Published by: Brill
Stable URL: http://www.jstor.org/stable/41038619
Page Count: 9
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
ON A NEW SPECIES OF MACROBRACHIUM (DECAPODA, PALAEMONIDAE) FROM ITHIKKARA RIVER, SOUTH-WEST COAST OF INDIA
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Abstract

Macwbrachium madhusoodani new species is described from the upper reaches of Ithikkara River, Kerala, South India. The species shares certain characters with M. scabriculum (Heller, 1862), M. aemulum (Nobili, 1906), and M. nobilii (Henderson & Matthai, 1910) in the number and arrangement of rostral teeth, while it differs remarkably from those three species in distinctive diagnostic characters: rostral formula 10-14/2-3 with 5-6 postorbital teeth; carapace smooth with distal end of rostrum straight; chelae with 4 denticles in the movable and 3 in the immovable finger, in the proximal part of the cutting edge; the distal part of the fingers of the second chelate legs are darkly pigmented except the tip. Three prominent pigment spots are found midlaterally on the last three abdominal somites, with prominent pigmentation at the tip of the telson. Macwbrachium madhusoodani sp. nov. est décrite des cours supérieurs de la rivière Ithikkara, Kerala, au sud de l'lnde. L'espèce partage certains caractères avec M. scabriculum (Heller, 1862), M. aemulum (Nobili, 1906), et M. nobilii (Henderson & Matthai, 1910), en particulier le nombre et l'arrangement des dents rostrales, tandis qu'elle diffère remarquablement de ces trois espèces par des caractères diagnostiques: formule rostrale 10-14/2-3 avec 5-6 dents post-orbitales, carapace lisse avec l'extrémité distale du rostre droite ; pinces avec 4 denticules sur le doigt mobile et 3 sur l'autre, situées dans la partie proximale du bord tranchant; parties distales des doigts des secondes pattes fortement pigmentées excepté a l'extrémité. Trois taches fortement pigmentées sont présentes médio-latéralement sur les trois derniers somites abdominaux, avec une pigmentation remarquable à l'extrémité du telson.

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