Stenchaetothrips yakuticus, Evdokarova & Vierbergen, 2024

Stenchaetothrips yakuticus

Evdokarova et Vierbergen, sp.n.

Figs 1–9 View Figs 1–9 .

MATERIAL. Russia: Central Yakutia : Pokrovsky tract, 25 km SSW of Yakutsk, shore of small lake at the edge of forest, Poaceae , 61’49' N, 129’39' E, 27.07.2017, Evdokarova T G. leg., 7 micropterous females .

Holotype: 1 ♀ in Senckenberg Natural History Museum , Frankfurt am Main, Germany ( SMF) . Paratypes: 1 ♀ in SMF , 1 ♀ in Netherlands Institute for Vectors Invasive plants and Plant health, Wageningen , 3 ♀♀ in Institute for Biological Problems of Cryolithozone ( IBPC) SB RAS , 1 ♀ Zoological Institute RAS ( St. Petersburg ) .

DESCRIPTION.

HOLOTYPE FEMALE. Micropterous. Body brown ( Fig. 1 View Figs 1–9 ), tarsi and apex of tibia light brown, antennae brown, wing light brown.

Antennal 7-segmented ( Fig. 2 View Figs 1–9 ); segment I without median dorsal apical setae, segment II with a mid-dorsal seta below CPS, segments III–IV with short forked sense cone; III– VI with some rows of microtrichia on both dorsal and ventral surfaces.

Head wider than long ( Figs. 1, 3 View Figs 1–9 ), ocellar setae I absent, setae II slightly longer setae III ( Fig. 3 View Figs 1–9 ). Pronotum with 2 pairs of developed pa ( Fig. 4 View Figs 1–9 ); anterior half weakly sculptured with widely spaced transverse striae, posterior half almost completely smooth, having a few posterior striae only; with four pairs of discal setae, the posterosubmarginal pair the longest and about equal in length to the medial posteromarginal setae. Mesonotum with median pair of setae situated far from posterior margin ( Fig. 5 View Figs 1–9 ); metascutum sculptured with narrow spaced longitudinal anastomosing striae except anteromedially 2/3 with transverse sculpture ( Fig. 5 View Figs 1–9 ); median pair of setae behind anterior margin. Mesosternum with spinula, metasternum without spinula ( Fig. 6 View Figs 1–9 ).

Wing micropterous, light brown; clavus with three veinal and one discal ( Fig. 5 View Figs 1–9 ).

Abdominal tergites II–VII with transverse irregular sculpture, in posteromedial half faint, posteromarginally with scallops ( Fig. 7 View Figs 1–9 ); tergite II with 4 lateral marginal setae; tergites VII–VIII with paired ctenidia, strongly reduced on VII, present on VIII; tergite VIII with sculpture in posteromedial half absent, with posteromarginal comb weakly developed at sides with partly grouped microtrichia ( Fig. 8 View Figs 1–9 ); tergite IX with two pairs of CPS; tergite X with longitudinal median split almost complete; sternites III to VII with 2 pairs of posteromarginal setae; all posteromarginal setae arising from posterior margin on II to VII except S1 setae on VII situated ahead of posterior margin ( Fig. 9 View Figs 1–9 ); pleurotergites without discal setae. Ovipositor developed.

Measurements (holotype in micron). Body length 635. Head length/width 129/157; setal lengths: ocellar II 23, ocellar III 19, po I 19, po III 16, 18. Antennal segments I–VII length/ width 22.0/29.0, 36.8/25.5, 48.8/21.0, 37.4/20.3, 36.6/18.8, 50.0/19.8, 22.0/7.2. Pronotum length/width 124/198, setal lengths: outher pa 43–48, inner pa 60, medial posteromarginal 23–26. Forewing length 96–103, hindwing 69–72. Metascutum length antero-angular setae 29, medial setae 32. Abdominal tergite IV length S1 30, distance between S1 55, tergite IX S1 93-96, S2 about 106.

ETYMOLOGY. The new species is named after the Yakutia – Siberian region of the Russian Federation.