Abstract
Heritable endosymbionts widely occur in arthropod and nematode hosts. Among these endosymbionts, Wolbachia has been extensively detected in many arthropods, such as insects and crustaceans. Maternal inheritance is the most basic and dominant mode of transmission of Wolbachia, and it might regulate the reproductive system of the host in four ways: feminization, parthenogenesis, male killing, and cytoplasmic incompatibility. There is a relatively high percentage (10%) of thelytokous species in Oribatida, a suborder under the subclass Acari of arthropods, but the study of the endosymbionts in oribatid mites is almost negligible. In this paper, we detected endosymbiotic bacteria in two parthenogenetic oribatid species, Nothrus anauniensis Canestrini and Fanzago, 1877, which has never been tested for endosymbionts, and Oppiella nova, in which Wolbachia and Cardinium have been reported before. The results showed that Wolbachia was first found in N. anauniensis with an infection rate of 100% across three populations. Phylogenetic analysis showed that Wolbachia in N. anauniensis belonged to the supergroup K, marking the second supergroup of Wolbachia found in oribatid mites. Unlike previous studies, our study did not detect Wolbachia in O. nova, leading to the exclusion of Wolbachia's role in mediating thelytoky in this species.
Published Version
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