Chromosomal characteristics of Aplocheilus lineatus (Cyprinodontiforms)
Reshma RS, Joelin Joseph, Sandeep Sreedharan, Dr. Mano Mohan Antony
Chromosomal analysis on fishes has been advantageous for phylogenetic studies, taxonomic investigations and genetic advancement that register the extensive chromosomal variability and high degree of polymorphism among different species. The present study is a pioneer work that targets the chromosomal detailing and inter specific comparison of Aplocheilus lineatus (cyprinodontiforms). The 63.3% of chromosomal spreads of, Aplocheilus lineatus obtained reveals the model chromosome number as 50 with the dominance of sub telocentric chromosomes that are exactly analogues to certain other genera that is closely related to the studied organism. From the karyological data obtained, the arm ratio was found to be between1.010±0.00-4.489±0.30 and the karyotypic formula was n =8 m+2m+15 St. The karyotype of a Aplocheilus lineatus obtained can be considered as a definite element, like any morphological character, for taxonomic purposes.