Brachysyntexis tigris Kopylov, 2018

Kopylov, Dmitry S., 2018, Forgotten giants: new Anaxyelidae (Hymenoptera) from the Jurassic of Karatau, Zootaxa 4514 (3), pp. 332-340 : 334-335

Brachysyntexis tigris Kopylov sp. nov.

( Figs. 2 , 4B )

Etymology. The species name, a noun, is derived from the Latin ‘tigris’ (tiger) due to its striped colouration.

Material. Holotype: PIN, no. 2997/648, from Karatau ( Kazakhstan), part without counterpart, imago, female. Relatively good preservation of the body; the ovipositor is distinguishable, one fore wing is preserved well, the other front wing and the hind wings are not complete; the legs and antennae are not preserved.

Description. Body light with dark mesonotum and dark transverse strips on abdomen; wing veins dark, membrane not coloured. Eye height equal to 0.5 of head height. Mesonotum without apparent sculpture, with welldeveloped longitudinal and V-shaped (scuto-scutellar) sulci and notauli, ratio of lengths of prescutum/longitudinal sulci between the prescutum and scutellum 2.0/1.0/3.7. Mesoscutellum with pointed front edge, 1.6 × as long as wide. Fore wing with costal cell very narrow; Sc not distinguishable (probably not preserved); 1-Rs straight, 1.8 × as long as 1-M; 2-M 1.2 × as long as Rs+M; 2-Rs 1.2 × as long as 1r-rs; 2r-rs 1.5 × as long as 1r-rs, issues from pterostigma at 3/5 of its length, rear edge of pterostigma slightly bent near 2r-rs; cell 1r 1.2 × as long as 2r; 2r 2.1 × as long as wide; 4+5-Rs 1.9 × as long as 3-Rs; 3+4-M 2.0 × as long as 5-M; 3r-m inclined, as long as 5-M; 2-Cu 1.6 × as long as 1-Cu; 1cu-a arched; 2cu-a straight; 3-1A 1.7 × as long as 2-1A. Hind wing with cell 1r 4.8 × as long as wide; 1-Rs 1.4 × as long as 2-Rs. Ovipositor very short, only extends slightly beyond the tip of the abdomen.

Measurements (in mm): length of body 15.0; head height 2.2; length of the fore wing 8.4, width 3.1.

Comparison. Regarding the structure of the mesonotum, the shape of pterostigma, cells 1r, 2r, 1mcu, 2+3rm, with length 5-M, inclival 3r-m, the new species is closest to B. tenebrosa (described above), from which it differs in smaller eyes, short 1-Rs, long 2-Rs in the fore wing, lighter colouration of the body, and smaller size.

Figures

FIGURE 2. Brachysyntexis tigris sp. nov., holotype: PIN, no. 2997/648: A. habitus draw, B. separated wings (showing names of the cells). Karatau; Kazakhstan, Upper–Middle Jurassic. Scale bar 5 mm.

FIGURE 4. New species of Anaxyelidae from Karatau: A. Brachysyntexis tenebrosa sp. nov., holotype PIN, no. 2066/3344, B. Brachysyntexis tigris sp. nov., holotype: PIN, no. 2997/648, C—Kulbastavia grandis sp. nov., holotype: PIN, no. 2997/5000. Karatau; Kazakhstan, Upper-Middle Jurassic. Scale bars 5 mm.