CHROMOSOMES OF CAECULA ORIENTALIS (McCLELLAND) (OPHICHTHYIDAE: TELEOSTEI) | BIONATURE

The morphometric analysis of somatic chromosomes from the gill epithelia and kidney of the marine fish Caecula orientalis was performed. There are 18 metacentric, 4 subtelocentric, and 16 telocentric chromosomes in the diploid complement of 38 chromosomes, with the fundamental arm number 60 and a relative percentage length variation of 8.86 to 2.70. Its karyotype has been compared to that of the lone cytologically known confamilial species Pisodomophis boro, as well as certain other anguilloid fishes from related families. Karyotypic conservatism in anguilloids has been emphasised, with the function of pericentric inversion in causing karyotypic variance among them. The cytological relationship of the family Ophichthyidae with Congridae and Anguillidae has been confirmed, and the likely roles of fusion and pericentric inversion in bringing out the karyotypes of anguilloids from the primitive karyotype for fishes have been examined.

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