A comprehensive redescription of the poorly known mecistocephalid genus Lignau, 1929 and its two species is provided, based on the examination of type material and new specimens, as well as the critical evaluation of all published information. is confirmed differing from all other Mecistocephalidae especially for a peculiar pattern of areolation and setation of the clypeus. Records from 24 localities indicate that is limited to a narrow area of Middle Asia, from the Western Tian-Shan to the western offshoots of Pamir Mountains. Two species are morphologically distinguishable: (Sseliwanoff, 1881) and Titova, 1975. They differ mainly in details of the clypeus and maxillae, in the pattern of forcipular denticles, and in the number of legs. Verhoeff, 1930 is confirmed as a junior synonym of , and a lectotype is designated for the former.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9023436PMC
http://dx.doi.org/10.3897/zookeys.1095.80806DOI Listing

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A comprehensive redescription of the poorly known mecistocephalid genus Lignau, 1929 and its two species is provided, based on the examination of type material and new specimens, as well as the critical evaluation of all published information. is confirmed differing from all other Mecistocephalidae especially for a peculiar pattern of areolation and setation of the clypeus. Records from 24 localities indicate that is limited to a narrow area of Middle Asia, from the Western Tian-Shan to the western offshoots of Pamir Mountains.

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August 2021

Institute for Problems of Ecology and Evolution, Russian Academy of Sciences, Leninsky pr. 33, Moscow 119071, Russia Institute for Problems of Ecology and Evolution, Russian Academy of Sciences Moscow Russia.

The diplopod tribe Brachyiulini is represented in the fauna of the Caucasus by eight genera and 32 species, of which one genus and 14 species are described as new: Vagalinski, , Vagalinski, , Vagalinski, , Vagalinski, , Vagalinski, , Vagalinski, , Vagalinski, , Vagalinski, , Vagalinski, , Vagalinski, , Vagalinski, , Vagalinski, , Vagalinski, , , and Vagalinski, , Colchiobrachyiulus Lohmander, 1936, a former subgenus of Megaphyllum, is here elevated to a full genus, and the genus Grusiniulus Lohmander, 1936 is downgraded to a subgenus of the genus Cyphobrachyiulus Verhoeff, 1900, both , with their previously described species, (Lignau, 1915) and (Lohmander, 1936), respectively, listed as (Attems, 1899) is formally established as a junior subjective synonym of (Karsch, 1881), , and (Golovatch, 1981) is formally synonymised with the typical (Lohmander, 1936), (Lohmander, 1932), originally described in the genus , is here transferred to the former genus, The diagnoses and descriptions of some genera and subgenera are refined and complemented. A key is given to all genera and species of Brachyiulini that occur in the Caucasus, and their distributions are mapped. Several species are recorded as new to the faunas of Armenia, Azerbaijan, Georgia, or Russia.

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