• N R Prabhoo

      Articles written in Proceedings – Animal Sciences

    • New predatory nematodes of the genusIotonchus (Iotonchidae—Mononchida) from the soils of Kerala (India)

      C Mohandas N R Prabhoo

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      Four new species of the genusIotonchus, viz.,I. nayari, I. kherai, I. khani andI. heynsi are described.I. nayari comes close toI. risoceiae but differs in having shorter body and longer spicules compared to body length.I. kherai differs fromI. indicus in body size, shape and size of buccal cavity and presence of males and fromI. risoceiae in the shape of buccal cavity and subventral opening of caudal glands.I. khani differs fromI. chantaburensis in having shorter tail, poorly developed caudal glands and spinneret and absence of distinct valve between oviduct and uterus.I. heynsi differs fromI. longicaudatus by having an indistinct terminal caudal gland opening, non-cuticularised vagina and absence of sphincter at oviduct-uterus junction and fromI. trichurus by the size and anterior position of dorsal tooth. A key to Indian species of the genusIotonchus is provided.

    • Meloidogyne (Nematoda: Meloidogynidae) induced root galls of the banana plantMusa paradisiaca — A study of histopathology

      S Sudha N R Prabhoo

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      Meloidogyne incognita (Kofoid and White 1919) Chitwood 1949 was found to complete its life cycle within the roots of the banana plantMusa paradisiaca (cultivar Palayathodan). Egg sacs were confined entirely within the root. Second stage larvae penetrated the endodermis and on entering the stele succeeded in inducing multinucleate giant cells which were solely confined to the stele and never found in the cortex, induction of giant cells and production of large number of females in banana roots showed that this is a susceptible host plant. Heavily infested roots showed histopathological changes which could lead to the blockage of conducting elements. This nematode is not very common in banana roots probably because second stage larvae emerging from the egg sacs reinfested the same roots and also because of the differential susceptibility of the various cultivars of the banana plant.

    • Recent trends in the biosystematics of Entognathous Apterygota with special reference to Collembola

      N R Prabhoo

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      In recent years increasing number of studies have been undertaken involving modern techniques like DNA hybridization, analysis of enzymic and chromosomal polymorphism in conspecific populations, ecophysiology and behaviour in individual species etc with far reaching implications in the systematics of Entognathous Apterygota, particularly the Collembola. Both scanning and transmission electron microscopes have been used extensively for the study of surface structure, sense organs, spermatozoa and gut providing considerable insight into phylogenetic relationship of higher taxa as well as interrelationships at the generic and lower taxonomic levels.

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