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At present, eight species are known in the genus Riccardoella Berlese, 1923. Six out of the eight species were reported from the lung and body surface of terrestrial gastropods, and the remaining two species were found only from soils (Berlese 1923; Fain and van Goethem 1986; Fain and Klompen 1990; Fain and Barker 2003, 2004; André et al. 2004; Waki et al. 2018a). The members of genus Riccardoella are divided into two subgenera, Riccardoella Berlese, 1923 and Proriccardoella Fain and van Goethem, 1986, based on the morphology of setae and leg chaetotaxy. The subgenus Riccardoella contains only one species, R. limacum Schrank, 1776, which is the type species of the genus. The remaining seven species belong to the subgenus Proriccardoella. In Japan, two species of the present genus were reported from terrestrial gastropods. Riccardoella (Proriccardoella) tokyoensis Waki and Shimano, 2018 was described from the lung of the clausiliid land snail, Tauphaedusa tau Boettger, 1877, in a forest city park in Tokyo, Japan (Waki et al. 2018a). Riccardoella (Proriccardoella) reaumuri Fain and van Goethem, 1986, which was described from the helicid land snail, Arianta arbustorum Linnaeus, 1758, in France, was reported from three species of land snails on Okinawajima-island (Waki et al. 2018b). In addition, Nakamura et al. (2006) reported Riccardoella sp., which was identified to the genus level, from soils in Shikoku, Japan. Here we report the occurrence of R. triodopsis Fain and Klompen, 1990 for the first time in Japan, since first taxonomically described from Alabama, USA. Additional morphological information is provided based on specimens newly collected. Materials and Methods

species diversity

First Record of &lt;i&gt;Riccardoella&lt;/i&gt; (&lt;i&gt;Proriccardoella&lt;/i&gt;) &lt;i&gt;triodopsis&lt;/i&gt; (Acariformes: Trombidiformes: Ereynetidae) from Japan, with Additional Morphological Information