[Parallel evolution of Myobiidae (Acari: Prostigmata) mites and jerboas (Rodentia: Dipodoidea)].
The phenomenon of the parallel evolution is considered with the example of the myobiid mites (Acari: Prostigmata: Myobiidae) and the jerboas (Rodentia: Dipodoidea). According to recent phylogenetic studies of the superfamily Dipodoidea it is separated into 4 family: Allactagidae, Dipodidae, Zapodidae and Sminthidae (Shenbrot e. a., 1995). The myobiid mites of the subenus Dipodomyobia (11 species) of the genus Cryptomyobia are known as specific parasites associated with jerboas of the families Dipodidae and Allactagidae. One more species (Radfordia ewingi) considered as incertae sedis species within the genus Radfordia is found on the jerboas of the family Zapodidae. The myobiid mites are apparently absent on the members of the family Sminthidae. The reconstruction of phylogeny of the myobiid subgenus Dipodomyobia was carried out by the cladistic method (software PAUP 3.0 s). The analysis was based on 13 morphological characters. At the first step of analysis 42 parsimonious trees have been obtained. The strict consensus tree displays one distinct cluster, which incorporates mites of the allactaga species of group restricted to the jerboa family Allactagidae, and several plesions, species of which are usually refferred to as dipi species group and associated with the family Dipodidae (fig. 1). At the second step of analysis, two characters, which appeared as homoplasies at the first step of analysis were excluded, and one new characters (structure of male genital shield) was additionally included. Single cladogram obtained displays two general clusters and one plesion. The first cluster comprises the allactaga species group (parasites of Allactagidae). The second cluster incorporates the dipi species group, the parasites of subfamilies Dipodinae and Paradipodinae of Dipodidae). The plesion is represented by one species Cryptomyobia baranovae being a specific parasite of Salpingotus crassicauda (Cardiocraninae, Dipodidae). There is the high level congruence between the pattern of myobiid cladogram and jerboas phylogeny proposed by Shenbrot (1992) (fig. 2). The position of one species C. paradipi (the parasite of Paradipus ctenodactylus, single representative of subfam. Paradipodinae) does not fit to this phylogenetic system of the jerboas. This mite species belongs to the claster dipi. All others myobiid species of this group are the parasites of the subfamily Dipodinae. In the cladogram of jerboas, the subfam. Paradipodinae is a sister group of Cardiocraninae, but not of Dipodinae, as it is suggested by the parasitological data. If sinapomorphies in the node Paradipodinae--Cardiocraninae are not correct (as Shenbrot admitted), there would be a complete congruence between the phylogenetic pattern of myobiid and of jerboas. The general phylogeny of Dipodoidea based on citogenetical data was proposed by Vorontsov e. a. (1971). 3 families only were recognized within Dipodoidea: Zapodidae, Sminthidae and Dipodidae. The latter family included 3 subfamilies: Dipodinae, Cardiocraninae and Allactaginae. The version of the jerboa phylogeny proposed in the present paper based on parasitological data corresponds in general lines to the hypotesis of Vorontsov e. a. (1971). The myobiid mites are absent on Sminthidae, they are represented by one species incertae sedis on Zapodidae, and by the subgenus Dipodomyobia on others jerboas (Dipodidae sensu Vorontsov e. a.). According to the parasitological data, the subfamilies Dipodinae and Allactaginae are the sister groups, because the myobiid mites of the subgenus Dipodomyobia parazitise on the jerboas of these taxa only. The subfamily Paradipodinae (sensu Shenbrot) is a sister group for Dipodinae, as far as species C. paradipi is the sister species to other members of the dipi group. The subfamily Cardiocraninae is a sister group for the node Dipodinae-Paradipodinae and also should be included to Dipodidae, because the aberrant species C. baranovae is obviously related to the dipi species group.
Bochkov
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D000053:Acari / Q000145:classification*; D000818:Animals; D006790:Host-Parasite Interactions; D010802:Phylogeny; D012377:Rodentia / Q000469:parasitology*