Ischnosoma molle, Assing & Schülke, 2017

Assing, Volker & Schülke, Michael, 2017, On the Ischnosoma fauna of Georgia (Coleoptera: Staphylinidae: Tachyporinae), Beiträge Zur Entomologie = Contributions to Entomology (Beitr. Entomol.) 67 (2), pp. 195-206 : 201-202

publication ID 10.21248/contrib.entomol.67.2.195-206

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scientific name

Ischnosoma molle

spec. nov.

Ischnosoma molle spec. nov.

( Figs 24–32 View Figs 24–35 , Map 2 View Map 2 )

Type material: Holotype : “N 41°39'12 E 41°45'36 (9), Georgien Adjara, Batumi 7 km NE 500–600 m, Brachat & Meybohm 24.6.2017 / Holotypus  Ischnosoma molle sp. n. det. V. Assing 2017” (cAss) . Paratypes: 1 , 1 : same data as holotype (cAss, cSch); 1 : “N 41°34'23 E 42°25'06 (6), Georgien Adjara, Skhalta - Tal 970 m, Brachat & Meybohm 22.6.2017 ” (cAss) .

Etymology: The specific epithet (Latin, adjective: soft) alludes to the weakly sclerotized aedeagus, including its internal structures.

Description: Body length 4.7–6.1 mm; length of forebody 2.1–2.5 mm; length of antenna 1.5–1.7 mm. Based on external characters ( Fig. 24 View Figs 24–35 ) indistinguishable from I. solodovnikovi SCHÜLKE, 2001 (Northeast Anatolia: Trabzon, Rize).

: sternite VII ( Figs 25–26 View Figs 24–35 ) with an oblong and extensive cluster of dense pale short setae in postero-median portion, near middle of posterior margin with modified short and stout setae; sternite VIII ( Figs 17–28 View Figs 11–23 View Figs 24–35 ) with broadly and deeply concave posterior margin, in posteromedian portion with cluster of dense and moderately long setae; aedeagus ( Figs 29–32 View Figs 24–35 ) 0.75 mm long, apex of ventral process subapically abruptly narrowed and apically acute in ventral view; internal structures weakly sclerotized; parameres regularly tapering apicad and with approximately 13 setae each.

Comparative notes: Based on the highly similar external and male sexual characters (including the shape of the apex of the ventral process of the aedeagus), I. molle is undoubtedly most closely allied to I. solodovnikovi , from which it differs only by a denser postero-median cluster of setae on the male sternite VIII, a less oblong male sternite VIII with a more broadly and more deeply concave posterior margin and with a more defined cluster of denser and longer setae, and an aedeagus with a more acute apex of the ventral process (ventral view) and with less distinctly sclerotized internal structures of different shapes.

Distribution and natural history: This species is currently known from two localities in the southwestern Caucasus Minor, Adjara region, Southwest Georgia ( Map 2 View Map 2 ). Its known distribution is separated from the allopatric range of I. solodovnikovi by two major river valleys.

The specimens were collected by sifting leaf litter in a mixed deciduous forest with walnut, chestnut, beech, laurel, and rhododendron (type locality) and in a mixed deciduous forest with beech and rhododendron at altitudes between approximately 550 and 970 m (MEYBOHM pers. comm.).