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15 January 2021 New taxonomic and ontogenetic data on oribatid mites of the genus Eutegaeus (Acari, Oribatida, Eutegaeidae)
Sergey G. Ermilov
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Abstract

Two new species of the genus Eutegaeus (Oribatida, Eutegaeidae) are described based on specimens from moss in the Queulat National Park of Chile. Eutegaeus aysenensissp. nov. (description based on the adult, larva, deuto- and tritonymph) is morphologically similar to that of Eutegaeus lagrecai in having long, flagellate interlamellar and notogastral setae and rod-like bothridial seta; it differs from the latter by having smaller body size and comparatively long bothridial seta, the lamella having anteromedial process, and by the absence of striate ornamentation on notogaster. Eutegaeus queulatensissp. nov. (description based on the adult, proto- and tritonymph) is morphologically similar to that of Eutegaeus membraniger in having a triangular anteromedial lamellar process, long, rod-like bothridial seta, foveate lamella, and dorsal notogastral setae of medium length; it differs from the latter by having smaller body length, thickened notogastral setae, flagellate interlamellar setae, setiform lamellar setae, a tubercle on epimere III, and absence of an anterolateral tooth on the lamella. Based on new information, several characters in the generic diagnosis of Eutegaeus adults are modified or expanded, and a preliminary diagnosis for juveniles is presented. The larva of E. aysenensissp. nov. is the first to be described for the genus. Nymphs of four species of Eutegaeus are compared.

© Systematic & Applied Acarology Society
Sergey G. Ermilov "New taxonomic and ontogenetic data on oribatid mites of the genus Eutegaeus (Acari, Oribatida, Eutegaeidae)," Systematic and Applied Acarology 26(1), 272-288, (15 January 2021). https://doi.org/10.11158/saa.26.1.15
Received: 1 November 2020; Accepted: 24 November 2020; Published: 15 January 2021
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