Abstract
ABSTRACTThe Ameronothridae are recorded for the first time from Japanese coasts with the new species Ameronothrus yoichi sp. n. from Hokkaido. The report of this species represents the most southern occurrence of an Ameronothrus species in the Asian Pacific region. Ameronothrus yoichi sp. n. can be easily distinguished from its congeners by the conspicuously pusticulate body surface and the loss of dorsal companion setae d on all genua in the adult stage. Based on adult and juvenile morphology, a close relation to Ameronothrus maculatus and A. schneideri is suggested. Ameronothrus yoichi sp. n. is classified as a lichenivorous inhabitant of sediment-free rocky coastal substrates. Due to a lack of genetic sequence data of nearly all ameronothrid species a molecular genetic comparison is yet unfeasible, but a Bayesian inference tree based on the 18S rRNA gene shows a paraphyletic clustering of the ameronothrid A. yoichi sp. n. and Paraquanothrus grahami.http://www.zoobank.org/urn:lsid:zoobank.org:pub:5B772E2C-7D5E-4C86-9955-AB84A84C50DA
Highlights
In the course of an ongoing project investigating the intertidal mite fauna of Japanese coasts, we found Ameronothrus individuals on the shore of Hokkaido
The new species Ameronothrus yoichi can be distinguished from its congeners by its unique prodorsal ridge structure, the conspicuously pusticulate body surface showing densely packed large nodules and the loss of dorsal companion setae d on all genua in the adult stage
Schulte (1975) classified four groups of Ameronothrus species based on morphological correlations, (I) the Ameronothrus marinus group containing A. marinus (Banks, 1896), A. bilineatus (Michael, 1888), A. schusteri Schubart, 1970 and A. schubarti Weigmann & Schulte 1975, (II) the Ameronothrus maculatus group consisting of A. maculatus (Michael, 1882) and A. schneideri (Oudemans, 1903), (III) the Ameronothrus lineatus group with A. lineatus (Thorell, 1871) and A. nigrofemoratus
Summary
The Ameronothridae are a group of several genera of freshwater and marine associated oribatid mites that either live in ephemeral rock pools of terrestrial environments or in various habitats of coastal regions. Berlese early proposed the genus Ameronothrus Berlese, 1896 and included it in Carabodidae (Berlese 1896), but later Willmann (1931) noticed that this genus represents an independent taxon. Though the latter author is often given as family author in literature (e.g. Weigmann 2006), it was Vitzthum (1942) who first mentioned the name Ameronothridae and is the true author of this taxon (e.g. Pfingstl 2017). Weigmann and Schulte (1977) supported his suggestion and included all the former Podacaridae and the freshwater associated South African Aquanothridae in the family Ameronothridae and this
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