Genetic differentiation among distinct karyomorphs of the wolf fish Hoplias malabaricus species complex (Characiformes, Erythrinidae) and report of unusual hybridization with natural triploidy.

摘要: = 42) and D (2n= 39/40) of the wolf fish Hoplias malabaricus, which is comprised several cryptic species that present a wide variety diploid chromosome numbers sex systems, resulting in identification seven distinct karyomorphs (A–G), was investigated using combination molecular cytogenetic tools. Deep sequence divergences for both were observed indicate long period reproductive isolation between A D. Additionally, one individual with 61 chromosomes identified, which, as far known, first case natural triploidy from hybridization these highly differentiated H. malabaricus. Molecular analyses revealed this allotriploid specimen carries two sets maternal karyomorph (2n 40) set (n= 21). Moreover, ribosomal sites active nucleolus organizer regions parental contributors found triploid hybrid. Considering significant genetic distances D, primary reasons lack recurrent reports theH. malabaricus complex may be due to post-zygotic barriers, such hybrid sterility or unviability.