First Report on Karyotypic, Morphometric and Meiotic Analysis of a Predatory Bombardier Beetle Pherosophus Catoirai (Coleoptera: Carabidae) from Jammu Region of Outer Himalayas, India

Arshad Ayoub Bhatti*, Nidhi Slathia and Manvi K

Department of Zoology, University of Jammu, Jammu and Kashmir-180006, India.

Corresponding Author E-mail: arshadayoub60@gmail.com

DOI : http://dx.doi.org/10.13005/bbra/2963

ABSTRACT:

Chromosomal studies and manual karyotyping are the aged techniques for determining the identity of a species on evolutionary scale; however, these techniques are simple, reliable and inexpensive to authenticate the existence of a particular species. In the present work, the chromosome complement and meiotic processes of a predatory bombardier beetle Pherosophus catoirai were investigated. This species presented 2n=35 as diploid chromosome number and the chromosomal formula was found to be 12m+8sm+12st+X0. Sex mechanism was X0 type with metacentric X chromosome. Y chromosome was absent in this species. Karyotype revealed small chromosomes except X chromosome which is found to be largest in the spermatogonial metaphase stage. Meiotic stages were pachytene, diplotene, diakinesis and metaphase-I. Present study may find importance to analyse evolution of chromosomes in order Coleoptera particularly in family Carabidae.

KEYWORDS: Chromosomes; Pachytene; Predatory; Pherosophus

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