New species and additional records of Ischnosoma from Georgia (Coleoptera, Staphylinidae, Tachyporinae)
Assing, Volker
Linzer biologische Beiträge
2019
2019-12-20
51
2
773
788
8Y4X4
Assing, 2019
Assing
2019
[151,329,305,327]
Insecta
Staphylinidae
Ischnosoma
CoL
Animalia
Coleoptera
2
775
Arthropoda
species
acre
sp. nov.
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. solodovnikoviSCHÜLKE, 2001 and I. molleASSING & 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 mmlong; 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. acreis undoubtedly closely allied to I. solodovnikovifrom Northeast Turkey( Trabzon, Rize) and I. molle(Southwest Georgia: Adjara: western Meskheti Range). It is distinguished from these species as follows: from I. solodovnikoviby 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 mmlong; 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. molleby 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 typespecimens 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.
2595615752
2019-07-21
T, V
Georgia
270
42.01389
Imereti
19
42.815556
2
775
2
Imereti
holotype
2595615742
2018-05-19
Georgia
1890
41.860275
Imeretien
19
41.860275
2
775
1
1
Imeretien
paratype
2595615709
2018-05-18
Georgia
290
42.01389
Baghdati
19
42.01389
Georgien
2
775
1
1
Imeretien
paratype