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Kerala, India

Pillai P.M.,Central Agricultural University | Unnikrishnan V.,Mahatma Gandhi College | Suresh Kumar U.,Rajiv Gandhi Center for Biotechnology
Zootaxa | Year: 2014

Macrobrachium abrahami, new species is described from Vamanapuram River, Kerala, South India. DNA bar-coding using Cytochrome B gene sequences has elucidated the taxonomic status of the new species and the ML tree reveals that M. abrahami sp. nov., is phylogenetically close to M. prabhakarani, but morphologically more similar to M. scabriculum. However, the species shares certain morphological characters with M. scabriculum, M. prabhakarani and M. lanatum, but differs remarkably from these three species in distinctive diagnostic characters: rostrum moderately long, convex, distal end directed upwards, rostral formula 12-15/2-3 with 5-6 postorbital teeth, and carapace glabrous. In larger second chelate leg, fingers stout, pubescence restricted to their base; proximal half of cutting edge with fifteen denticles. In smaller second chelate leg, cutting edge of both fingers carry six small denticles situated proximally, distal one comparatively larger. Delicate setae are seen throughout the palm. A row of dark chromatophores is present along the posterio-dorsal margin of uropodal exopods and endopods, close to the base of uropodal setae. The thickness of each band of the row is almost equal to the thickness of uropodal setae. © 2014 Magnolia Press. Source


Pillai P.M.,Central Agricultural University | Unnikrishnan V.,Mahatma Gandhi College
Zootaxa | Year: 2013

Macrobrachium aemulum madhusoodani, a new subspecies of M. aemulum (Nobili, 1906) is described and illustrated. The distinctive characters of the subspecies are: Rostral formula 9-13/2, second pereiopods dissimilar in shape and unequal in size, movable finger of larger second pereiopod with 2 large denticles on the proximal part and 6 weak denticles on distal part. Similar pattern of dentition is present on immovable finger also. In second small pereiopod, fingers stout, equal, unarmed with distinct gap in between when closed. Numerous stiff setae present on cutting edges of fingers. Telson ex-tends beyond the level of the outer lateral spine of the uropodal exopod. Some of the distinctive morphometric and meristic characters of the specimens did not conform to that collected and described from New Caledonia by Nobili (1906) and recorded from India by Jayachandran and Joseph (1988). Since the features cannot be reckoned as mere growth variations, it is described herein as a new subspecies. © 2013 Magnolia Press. Source


Pillai P.M.,Central Agricultural University | Unnikrishnan V.,Mahatma Gandhi College
Zootaxa | Year: 2013

Macrobrachium snpurii sp. nov., collected from the Karamana River, in the lower reaches of Western Ghats, is described and illustrated. DNA barcoding using Cytochrome B gene sequences has elucidated the taxonomic status of the new spe-cies and the NJ tree reveals that M. snpurii sp. nov., is phylogenetically close to M. idella idella. However, morphometric and meristic features of the species share certain characters with M. idella idella, M. patheinense and M. tratense, while it diverges remarkably from these three species in distinctive diagnostic characters: rostral formula 12-14/4 with 2 pos-torbital teeth; carapace smooth with distal end of rostrum directed upwards; chelae with 2 proximal denticles both in the movable and immovable fingers. A wide gap present in the distal part of the chelae, when fingers are closed. Movable finger, longer than the immovable and distal end of fingers inwardly hook-like; palm more pigmented than fingers and telson extends beyond the level of the outer lateral spine of uropodal exopod. A pair of plumose setae is present between the inner pair of movable spines of telson. Copyright © 2013 Magnolia Press. Source


Biju S.,Korea University | Gopakumar N.,Mahatma Gandhi College | Bunzli J.-C.G.,Korea University | Bunzli J.-C.G.,Ecole Polytechnique Federale de Lausanne | And 3 more authors.
Inorganic Chemistry | Year: 2013

Three new lanthanide heterocyclic β-diketonate complexes [Dy(PPI) 3(EtOH)2] (1), [Dy(PPI)3(DPEPO)] (2), and [Tb(PPI)3(DPEPO)] (3) [where HPPI = 3-phenyl-4-propanoyl-5- isoxazolone and DPEPO = bis(2-(diphenylphosphino)phenyl)ether oxide] have been synthesized and fully characterized. Single-crystal X-ray diffraction analyses reveal that these complexes are mononuclear and that the central Ln III ion is coordinated to eight oxygen atoms that are provided by three bidentate β-diketonate ligands and ethanol or bidentate DPEPO in a distorted square antiprismatic geometry. These complexes have high molar absorption coefficients (up to 3 × 104 M-1 cm -1 at 285 nm) and display strong visible and, for DyIII, NIR luminescence upon irradiation at the ligand-centered band in the range 250-350 nm. The emission quantum yields and the luminescence lifetimes at room temperature are 3 ± 0.5% and 15 ± 1 μs for 1, 12 ± 2% and 33 ± 1 μs for 2, and 42 ± 6% and 795 ± 1 μs for 3. Moreover, the crystals of 2 and 3 exhibit brilliant triboluminescence, visible in daylight. © 2013 American Chemical Society. Source


Pillai P.M.,Central Agricultural University | Unnikrishnan V.,Mahatma Gandhi College
Zootaxa | Year: 2012

Macrobrachium prabhakarani new species is described from the Vamanapuram River, Kerala, S. India. The species shares certain characters with M. scabriculum and M. madhusoodani, while it differs remarkably from these two species in dis-tinctive diagnostic characters: rostral formula 12-14/1-2 with 5-7 postorbital teeth; carapace smooth with distal end of rostrum directed forwards; chelae with nine denticles in the movable and six in the proximal part of the immovable finger. In larger second chelate leg, merus is longer than carpus and ischium, and propodus is the longest podomere. Carpus and ischium, equal in length and they are the shortest podomeres. Merus and dactylus are also of equal length. © 2012 Magnolia Press. Source

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