Revision of the Unionicolinae (Acari: Unionicolidae)

1987

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Armatax Bader is considered as a group that is closely related to the subgenus Unionicola Haldeman. Unionicola (Parasitatax) neocooki nornen novurn is erected to replace the preoccupied name U. (P.) cooki Vidrine. U. (?) incerta Bader is tentatively placed in the subgenus Unionicola. Hydrachna triangularis Say and Hydrachna pyriformis Dana and Whelpley are suggested as nomina dubia. Six subspecies in the subgenus Unionicola are elevated to species rank.

Section: Resultsmentioning

confidence: 98%

“…The Unionicolinae Oudemans (with a monotypic genus Unionicola Haldeman), a monophyletic group of subgenera based upon synapomorphic and symplesiomorphic character states of female genital fields, male genital fields, walking qegs and pedipalps, was recently revised (Vidrine 1986a). I placed the 187 known species into 18 subgenera.…”

Section: Introductionmentioning

confidence: 99%

Comments on the taxonomy ofUnionicola(Unionicolidae)

1987

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“…Although the identification and classification of Unionieola have been reasonably documented (Vidrine, 1986a(Vidrine, , 1996a, phylogenetic relationships among members that comprise the group are less well known. The evolution of unionicolid mites appears to be closely tied to the evolutionary history of their hosts, given that major clades of mollusks are parasitized by unique assemblages of Unionicola subgenera (Vidrine, 1996b).…”

Section: Introductionmentioning

confidence: 99%

“…The evolution of unionicolid mites appears to be closely tied to the evolutionary history of their hosts, given that major clades of mollusks are parasitized by unique assemblages of Unionicola subgenera (Vidrine, 1996b). Vidrine (1986aVidrine ( , 1996b) provided a framework regarding relationships among Unionicola subgenera based upon general anatomical comparisons, but a reconstruction of the evolutionary history among subgenera or among species that are included in subgeneric groupings has not been attempted using phylogenetic approaches. Addressing evolutionary relationships among species of Unionicola within subgenera using morphological criteria may prove to be problematical for at least two reasons.…”

Section: Introductionmentioning

confidence: 99%

Phylogenetic relationships among species of the subgenusParasitatax(Acari: Unionicolidae:Unionicola) based on DNA sequence of the mitochondrial cytochrome oxidase i gene

Ernsting

Edwards

et al. 2006

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Morphological differences among species of parasitic water mites in subgenus Parasitatax (Unionicolidae: Unionicola) are comparatively minor, with taxonomic distinctions among most members of the taxon based on subtle differences in one or two morphological characters. Two species of the subgenus, Unionicolaformosa Dana and Whelpley, 1836 and U. foili Edwards and Vidrine, 1994 are morphologically indistinguishable and have been designated separate species on the basis of host specificity and allozyme analysis. The present study examines heterogeneity in sequence data of the mitochondrial cytochrome oxidase subunit I (COI) gene among four putative species of the subgenus Parasitatax: U. dimocla" Vidrine, 1986, U.foili, U.formosa, and U. ypsilophora Bonz, 1783. Because populations of U.formosa from different species of host mussels are genetically divergent, intraspecific diversity of the COI gene among host-associated populations of U. formosa was also examined. DNA sequence data was used to construct a phylogenetic hypothesis for the group and assess the degree to which a phylogeny based on molecular data is consistent with traditional taxonomy. Maximum parsimony and maximum likelihood analysis each yielded a single tree with the same topology and high bootstrap support. The gene tree indicates two major clades, with U. dimocki and U. ypsilophora forming one clade and U. foili along with host-associated populations of U.formosa forming the other. The latter clade resolved into two branches and indicated that one host-associated population of U. formosa is more closely related to U. foili than it is to other host-associated populations of U. formosa.

“…All bars on figures equal 100 microns (0.1 ram). Mitchell and Wilson 1965 Vidrine 1985 and1986b); chaetotaxy and leg segment ratios of the first walking leg distinctive ( fig. 1); Ta of the first walking leg shorter than Ti; ventral setae on Ti shorter than width of segment; ventral setae of Ge unequal in length with one or two setae greater in length than the width of the segment; dorsal setae on Ge thick and prominent, usually 2 to 4 setae in a dorsal row; usually 2 or 3 setae in central row on Ge; all setae on Ge relatively pointed at tips; male and female legs similar, however, female legs may have one or two additional setae on the Ge.…”

Section: Introductionmentioning

confidence: 98%

Ten new species of water mites (Acari: Unionicolidae:Unionicola: Unionicolides) in North American fresh-water mussels (Unionacea: Unionidae: Ambleminae)

1987

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Nine new species (Unionicola (Unionicolides) parked, gowani, alleni, bogani, gailae, gordoni, guilloryi, hendrixi and kavanaghi) are described for the first time. Each of these species was previously considered as a part of the Unionicola vamana Mitchell and Wilson-comples. Unionicola (Unionicolides) vikitrella new species is also described. It was formerly considered as a part of the Unionicola vikitra Mitchell and Wilson-complex. Each of these new species is apparently host specific in one or a few related species of fresh-water mussles. Adaptive speciation is suggested for this group of incipient species, since each mite species is apparently isolated within specific host mussels.