Pterostichus ( Cryobius ) storozhenkoi Sundukov, 2025

Pterostichus ( Cryobius) storozhenkoi Sundukov , sp. nov.

( Figs 1–5 View FIGURES 1–5 )

Type locality. RUSSIA, Khabarovsky Krai , Sikhote-Alin Mts, Tardoki-Yani Mt., 48.901837 N, 138.075219 E GoogleMaps .

Type material. Holotype, ♂ with labels: “Sikhote-Alin, Tardoki-Yani Ridge, rocky placers, 19.VI.1980, leg. A. Plutenko / 1600–1700 m, western exposure slope” (in Russian); “ HOLOTYPUS Pterostichus ( Cryobius) storozhenkoi sp. n. det.Yu. Sundukov 2025” [FEB]. Paratypes, ♀, “Sikhote-Alin, Tardoki-Yani Ridge, rocky placers, 19.VI.1980, leg. A. Plutenko / 1600–1700 m, western exposure slope” (in Russian), “ PARATYPUS Pterostichus ( Cryobius) storozhenkoi sp. n. det. Yu. Sundukov 2025” [FEB]; 3♀, “Sikhote-Alin, Tardoki-Yani Ridge, tundra, 1925 m, 24.VI.1980, leg. A. Plutenko (in Russian); “ PARATYPUS Pterostichus ( Cryobius) storozhenkoi sp. n. det. Yu. Sundukov 2025” [FEB].

Description. Body slightly convex. Length 7.10–7.45 mm, width 2.35–2.51 mm.

Body black; antennae, palps, mandibles and legs brownish-red, femora are often darkened.

Dorsal side of head almost smooth, with very weak isodiametric meshes on the occiput; pronotum almost glossy, with uneven areas of very weak transverse meshes; elytra with superficial short transverse meshes, more distinct in females.

Measurements: HW 1.25–1.40 (M 1,32); HL 0.88–0.93 (M 0.90); PA 1.25–1.33 (M 1.28); PW 1.80–1.95 (M 1.88); PB 1.21–1.33 (M 1.30); PLt 1.64–1.71 (M 1.68); PLm 1.55–1.65 (M 1,60)); EW 2.35–2.51 (M 2.42); EL 3.80–4.35 (M 4.09); Ls 6.34–6.94 (M 6.67); L 7.10–7.45 (M 7.34).

Head small, convex, rather short, HW/HL 1.39–1.51 (M 1.47). Eyes relatively large, hemispherical. Temples short, about 1/3 longitudinal diameter of eye. Frontal grooves short, moderately deep, widely groove-shaped, weakly diverging backwards, starting from anterior supraorbital seta, distinct on clypeus. Frontoclypeal suture thin, distinct. Clypeus trapezoidal with slightly concave anterior margin and single seta on each side. Labrum transverse, with 6 setae along anterior margin. Mandibles short, strong. Tooth of mentum short, a third as long as lateral lobes, concave at apex. Antennae rather thick, moderately long, in males and females they extend beyond the base of pronotum by 2.5 apical segments.

Pronotum elongate-cordate, rather large (PW/HW 1.36–1.50, M 1.43; EW/PW 1.25–1.32, M 1.28), slightly wider than long (PW/PLt 1.07–1.15, M 1.12), with maximum width in anterior third.Anterior margin barely concave, anterior angles barely protruding, widely rounded at apex. Sides moderately convex in front, before posterior angles moderately concave or almost rectilinear. Base rectilinear and narrow (PW/PB 1.41–1.48, M 1.44; PB/PA 0.95– 1.06, M 1.01). Posterior angles acute, pointed at apex, slightly projecting laterally. Disc moderately convex up to narrow lateral margin, slightly flattened middle. Median line thin, distinct. Anterior transverse impression weak. Two basal foveae on each side, inner deep, parallel or slightly arcuate, running on about basal third, outer short, rounded, completely fused to inner ones. Puncturation present only in basal foveae. Two setae on each side: in front of maximum width and in posterior angles.

Elytra moderately convex, long (EL/EW 1.62–1.73, M 1.69; EL/PLt 2.32–2.54, M 2.43) and narrow, slightly elliptic to subovate, widest two thirds from base. Disc convex, weakly convex in middle. Humeri broadly rounded, not protruding, with small tooth; basal ridge weakly concave. Striae complete, straight, moderately deep, finely punctate.Intervals 1–5 moderately convex, outer ones flattened. Parascutellar striole indistinct or absent. Parascutellar setigerous pores absent. 3rd interval with 3 large discal pores: anterior usually near 3rd stria (rarely at middle of interval or at 2nd stria), intermediate and posterior proximate to 2nd stria. Umbilical seta series consisting of 9–10 setae: 5–6 in humeral group and 4 at apex. Preapical notches very weak. Apterous.

Legs moderately long, relatively slender. Middle and hind femora with 2 setae along posterior margin. Hind coxae with 3–4 setae. Trochanters with 1 seta. Metepisternum short: 1.10–1.15 times longer along outer margin than width along anterior margin. Tarsomere 5 with thin ventral setae in apical half.

Pro-, meso-, metepisternum, mesoventrite/mesosternum and sides of 1st and 2nd visible abdominal sternites sparsely punctate. Intercoxal process of prosternum not bordered, rounded at apex. Anal sternite in male with 2 setae at apex, in female—with 4 setae.

Aedeagus ( Figs 2–5 View FIGURES 1–5 ). Median lobe thickened in basal part, moderately curved ventrally in basal part and weakly before apex. Apical lamella short, narrowed towards apex; its length about 3 times less than diameter of aedeagus in basal part.

Etymology. The name is given in honor of the well-known Russian entomologist and hero of the day Sergey Yurievich Storozhenko.

Distribution. Known only from the type locality.

Habitat. Inhabits high-mountain rocky tundra.

Differential diagnosis. Pterostichus storozhenkoi sp. nov. is closest to P. glukhomanka Sundukov, 2013 , which is widespread in the highlands of the Middle Sikhote-Alin. The new species differs from the latter in its smaller body size, the presence of only three ( vs. 4–5) discal pores in the third interval of the elytra, punctate episterna, mesothorax, and lateral margins of the first and second visible sternites of the abdomen (in P. glukhomanka the entire lower side is impunctate), as well as by larger eyes and indistinctly punctate striae of the elytra.