Conidiobolus antarcticus, a synonym of C. osmodes

DNA from two ribosomal regions (nrLSU and mtSSU) and one protein coding region (RPB2) was sequenced and analysed for ten Conidiobolus isolates, including the ex-type isolates of C. antarcticus and C. osmodes, and a detailed morphological comparison of these two species was compiled. Conidiobolus antarcticus formed a highly supported (100%) clade with three C. osmodes isolates in the phylogenetic tree based on the combined data sets of these three genes. The two species were similar in the colony diameter, hyphal diameter, primary conidial size and shape, and zygospore formation, size, and shape. Therefore, we consider C. antarcticus to be a synonym of C. osmodes.