Ischnosoma acre Assing 2019
- Dataset
- New species and additional records of Ischnosoma from Georgia (Coleoptera, Staphylinidae, Tachyporinae)
- Rank
- SPECIES
- Published in
- Assing, Volker (2019): New species and additional records of Ischnosoma from Georgia (Coleoptera, Staphylinidae, Tachyporinae). Linzer biologische Beiträge 51 (2): 773-788, DOI: 10.5281/zenodo.3738587
Classification
- kingdom
- Animalia
- phylum
- Arthropoda
- class
- Insecta
- order
- Coleoptera
- family
- Staphylinidae
- genus
- Ischnosoma
- species
- Ischnosoma acre
description
E t y m o l o g y: The specific epithet (Latin, adjective: acute) alludes to the acute apex of the ventral process of the aedeagus in ventral view. D e s c r i p t i o n: Body length 4.7 - 5.0 mm; length of forebody 2.1 - 2.2 mm. Habitus as in Fig. 1. External characters as in I. solodovnikovi SCHÜLKE, 2001 and I. molle ASSING & SCHÜLKE, 2017. Distinguished only by the male primary and secondary sexual characters. ♂: sternite VII (Figs 17, 26 - 27) with a cluster of moderately dense thin setae in posteromedian portion, posterior margin truncate; sternite VIII (Figs 18 - 19) with a cluster of moderately dense long and thin setae in postero-median portion, posterior margin shallowly triangularly excised; aedeagus (Figs 9 - 12) approximately 0.7 mm long; ventral process apically very acute in ventral view; internal structures shaped as in Figs 9 - 12. C o m p a r a t i v e n o t e s: Based on the external and the male sexual characters, I. acre is undoubtedly closely allied to I. solodovnikovi from Northeast Turkey (Trabzon, Rize) and I. molle (Southwest Georgia: Adjara: western Meskheti Range). It is distinguished from these species as follows: from I. solodovnikovi by smaller body size, longer and thin setae near the median portion of the truncate posterior margin of the male sternite VII, a shorter and less slender male sternite VIII with denser pubescence in the postero-median portion, and by a smaller aedeagus (I. solodovnikovi: 0.78 - 0.90 mm long; n = 6) with a significantly more acute apex of the ventral process (ventral view) and with less strongly sclerotized internal structures of different shapes (for comparison see Figs 15 - 16, 23 - 25, 30 - 31); from I. molle by longer and less stout pubescence in the postero-median portion of the male sternite VII, a male sternite VIII with a smaller, less deep, and more triangularly shaped posterior margin (broadly concave in I. molle) and with a less distinctly delimited and less extensive cluster of much less dense and longer pubescence in the posteromedian portion, and a slightly smaller aedeagus with an apically more acute ventral process (ventral view) and with sclerotized internal structures of slightly different shapes. D i s t r i b u t i o n a n d n a t u r a l h i s t o r y: The type specimens were found in two localities in the north slope of the Meskheti Range, Imereti region, Southwest Georgia (Map 1) at altitudes of 270 - 290 and 1890 m. They were sifted from chestnut leaf litter, from litter near rocks (MEYBOHM pers. comm.), and from leaf litter in a deciduous forest margin.
Name
- Homonyms
- Ischnosoma acre Assing 2019