Evidence for a species complex in Indialona ganapati (Chydoridae)

Abstract

Indialona ganapati (Petkovski 1966), is one of the three known cladoceran endemic species from India. It is also the only one of these species that is monotypic and endemic to central India. In this study we report on habitat shifts for this species as well as presence of parthenogenetic and ephippial females throughout the year, phenomena that are uncommon in most species of the family Chydoridae. These factors prompted us to undertake a study evaluating the taxonomic status of this species in collections from India using morphological and molecular methods. This included recognition of some degree of morphometric diversity based on sexual differentiation and reproductive patterns which were not correlated with speciation events. Analysis of our data does, however, suggest that I. ganapati can be split into two recent clades. Also, phylogenetic as well as haplotype network analysis of our data suggests the presence of a sibling species complex of I. ganapati in the river Godavari. This suggests that reconsideration of taxonomic status of this species may be appropriate. In addition, this study underscores the potential utility of using COI gene based ‘barcode’ DNA sequences for recognizing the existence of cryptic species among the cladocera.