Testergus
Creators: name: Konstantinov, Alexander S.
Publisher: name: Zenodo
Year: 2005
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Chrysomelidae
Testergus

description: Key to Testergus species from Greece, Caucasus, and Middle Asia
Longitarsus excipennis Lopatin, L. turkomanorum Lopatin (Lopatin 1967) and L. joisiphi Konstantinov currently excluded from Testergus, are included in this key for practical reasons. Other species previously included in Testergus constitute a natural group that will be treated separately. Longitarsus truncatellus Weise known from Greece and Israel (Warchalowski 2003) clearly belongs to Testergus and thus included in the key.
1. Median lobe of aedeagus slightly impressed in middle, with shallow longitudinal impressions laterally .............................................................................................. 2
­ Median lobe of aedeagus deeply impressed in middle, without longitudinal impressions laterally ............................................................................................... 3
2(1). Frontal calli sharply delineated from vertex. Median lobe of aedeagus gradually narrowing towards apex. Apex without denticle­like structure (Fig. 5)................... ................................................................................................ L. excipennis Lopatin
­ Frontal calli poorly delineated from vertex. Median lobe of aedeagus abruptly narrowing towards apex. Apex with denticle­like structure (Fig. 16) ........................... ......................................................................................... L. turkomanorum Lopatin
3(1). Apical margins of elytra normally convex, leaving none or only small part of abdominal tergite exposed. Humeral calli poorly developed or absent. Elytral base much wider than pronotal base ............................................................................... 4
­ Apical margins of elytra concave, leaving large part of abdominal tergite exposed. Humeral calli absent. Elytral base nearly as wide as pronotal base ....................... 7
4(3). Wings absent or present. Median lobe of aedeagus strongly concave laterally (Fig. 6). Ventral groove of median lobe of aedeagus with sharp longitudinal ridge. Spermathecal duct without coils (Fig. 26) ........................ L. fuscoaeneus Redtenbacher
­ Wings absent. Median lobe of aedeagus straight or only slightly concave laterally. Ventral groove of median lobe of aedeagus without longitudinal ridge. Spermathecal duct with coils (except for L. josiphi, see Fig. 35)............................................ 5
5(4). Elytron with long hairs, visible at relatively low magnification. Ventral groove of median lobe of aedeagus with low and short ridges apically (Fig. 10) .................... ................................................................................................... L. pubescens Weise
­ Elytron with tiny hairs, visible only at high magnification. Ventral groove of median lobe of aedeagus without ridges apically ................................................... 6
6(5). Elytra with maximum width near middle. Ventral groove of median lobe of aedeagus wide in middle (Fig. 11) ............................................................. L. lederi Weise
­ Elytra with maximum width anterior to middle. Ventral groove of median lobe of aedeagus narrow in middle (Fig. 15) ...................................... L. truncatellus Weise
7(4). Median lobe of aedeagus slender, evenly curved in lateral view (Fig. 8). Abdominal sternite 8 in female visibly sclerotized apically and laterally (Fig. 37).............. ............................................................................................ L. josiphi Konstantinov
­ Median lobe of aedeagus robust, nearly straight in lateral view. Abdominal sternite 8 in female membranous apically and laterally (Figs. 34, 41, 52, 57).................... 8
8(7). Dorsum with reddish tint. Apex of median lobe of aedeagus straight and relatively thick in lateral view (Fig. 12) ........................................... L. sengloki Konstantinov
­ Dorsum without reddish tint. Apex of median lobe of aedeagus curved and thin in lateral view.............................................................................................................. 9
9(8). Apex of median lobe of aedeagus without denticle­like structure ....................... 10
­ Apex of median lobe of aedeagus with denticle­like structure............................. 11
10(9). Dorsum with greenish tint. Antennomeres 2 to 4 dark, as dark as antennomeres 1 and 5. Tibiae dark. Apex of median lobe of aedeagus flat or concave (Fig. 9). Anterior apex of tignum abruptly expanded, much wider than posterior apex (Fig.31) ...................................................................................................... L. nadiae sp. nov.
­ Dorsum black, without greenish tint. Antennomeres 2 to 4 light, lighter than antennomeres 1 and 5. Tibiae light. Apex of median lobe of aedeagus convex (Fig. 14). Anterior apex of tignum gradually expanded, not wider than posterior apex (Fig. 52) ............................................................................. L. tmetopterus Jacobson
11(9). Dorsum dark brown. Legs yellow, pro­ and mesotibia nearly as light as pro­ and mesofemora. Spermathecal duct basally projecting away from direction of receptacle (Figs. 17, 49) ............................................................................................... 12
­ Dorsum black with metallic lustre. Legs brown, pro­ and mesotibia slightly darker than pro­ and mesofemora. Spermathecal duct basally projecting in direction of receptacle (Fig. 31) ............................................................................................... 13
12(11). Ventral groove of median lobe of aedeagus nearly parallel sided (Fig. 3). Length of coiled part of spermathecal duct greater (Fig. 17) ......................... L. borisi sp. nov.
­ Ventral groove of median lobe of aedeagus wide apically, narrowing abruptly towards middle (Fig. 13). Length of coiled part of spermathecal duct smaller (Fig. 49) ........................................................................................... L. sogdianus Lopatin
13(11). Punctation on pronotum nearly as coarse as punctation on elytra. Apical declivity of elytra with sparse short setae. Denticle­like structure on apex of median lobe of aedeagus narrow. Ventral groove of median lobe of aedeagus narrowing abruptly towards apical third of median lobe (Fig. 7). Spermathecal pump without well
developed border between vertical and horizontal parts. Vertical part very short (Fig. 31). .......................................................................................... L. igori sp. nov. ­ Punctation on pronotum much finer than punctation on elytra. Apical declivity of elytra without sparse short setae. Denticle­like structure on apex of median lobe of aedeagus wide. Ventral groove of median lobe of aedeagus narrowing abruptly towards basal third of median lobe (Fig. 4). Spermathecal pump with well developed border between vertical and horizontal parts. Vertical part long (Fig. 22) ...... ............................................................................................... L. danilevskyi sp. nov.
description: Published as part of Konstantinov, Alexander S., 2005, New species of Middle Asian Longitarsus Latreille with discussion of their subgeneric placement (Coleoptera: Chrysomelidae), pp. 19-42 in Zootaxa 1056 on pages 22-24, DOI: 10.5281/zenodo.170096