Steirodon (Steirodon) superbum Gorochov, 2025

Steirodon (Steirodon) superbum Gorochov View in CoL sp. nov.

( Figs 1–4 View Figs 1–15 , 16, 17 View Figs 16–23 , 24, 25 View Figs 24–37 , 38–43 View Figs 38–57 )

Etymology. This name is the Latin word “superbum ” (proud, high) due to very high dorsolateral keels on the pronotum.

Material. Holotype – male, PERU: Ucayali Department, Atalaya Prov. , ~ 35 km NWW of Atalaya Town on Ucayali River, environs of Sapani Vill., ~ 300 m, primary forest, at light, 26–31 October 2008, A. Gorochov, M. Berezin, L. Anisyutkin, V. Izerskyy ( ZIN) . Paratypes: 5 males, 1 female, same department, “ Atalaya Distr. , Pitza Vill.”, 10 º 54.790' S, 73 º 51.054' W, February 2021, possibly V GoogleMaps . Izerskyy ( ZIN) .

Description. Male (holotype). Coloration and structure of body similar to S. (S.) validum but with following characters: coloration yellowish with greenish tinge on tegmina, pterothorax and abdominal tergites (perhaps entirely light green in living condition), but head with poorly distinct light brown area on dorsum, pronotum with reddish brown stripe on disc along anterior edge and intensively brown posterior third of disc (including inner surfaces of posteri- or parts of dorsolateral keels; Figs 1–3 View Figs 1–15 ), wings with barely darkened narrow stripes along some veins in lateral tegminal field ( Fig. 16 View Figs 16–23 ) as well as transparent rather small areas in stridulatory apparatus ( Figs 24, 25 View Figs 24–37 ) and membranes in hind wing (apical part of latter wing also yellowish or light green, and venation of this wing yellowish to almost whitish), and legs with only distal parts of claws somewhat darkened (other darkened marks on legs absent); rostral tubercles of head almost without median longitudinal concavity or sulcus dorsally and anteriorly, but apex of upper tubercle barely concave, and apical part of lower tubercle widely rounded and with small lateral projections (i.e., this apical part insignificantly wider than apex of upper tubercle; Fig. 1 View Figs 1–15 ); pronotum rather short, with disc having distinct dorsal concavity near significantly concave anterior edge (this edge also with poorly distinct median denticle) and moderately deep transverse fold before posterior third ( Fig. 2 View Figs 1–15 ), with rather high and short lateral lobes narrowing to rounded lower part and having characteristic relief ( Fig. 3 View Figs 1–15 ), and with very high dorsolateral keels consisting of 19–20 high denticles (partly fused with each other) and having more or less angular apices of these denticles (these keels in profile forming almost rectangularly curved dorsal edge with highest angular projection locat- ed almost at middle of their length and directed upwards; Figs 1–3 View Figs 1–15 ); tegmina long and moderately narrow, with base of RS located rather far from tegminal base, with most part of anal edge almost straight but slightly concave before distal part of lateral field ( Fig. 16 View Figs 16–23 ), with stridulatory apparatus in left tegmen having slightly S-shaped stridulatory vein (length of this vein about 5 mm) and nearby 74 teeth on its venter as well as almost straight anal tegminal edge from this vein to distally narrowed part of dorsal field (this edge barely convex in middle portion and very shallowly notched behind this portion; Figs 17 View Figs 16–23 , 24 View Figs 24–37 ), and with stridulatory apparatus in right tegmen as in Fig. 25 View Figs 24–37 ; hind wings almost as long as tegmina and slightly protruding beyond tegminal apices in rest position; legs with almost slit-like both tympana ( Figs 38, 39 View Figs 38–57 ), and with widenings of middle and hind tibiae as in Figs 40, 41 View Figs 38–57 ; abdominal apex typical of this subgenus, but genital plate posteriorly having roundly convex median part as well as a pair of short lateral tubercles with rather small but thin and elongated styli ( Figs 42, 43 View Figs 38–57 ).

Variations. Male paratypes slightly darker and with brownish tinge, but possibly these darkenings artificial due to bad drying in field conditions. Upper rostral tubercle dorsally often with more distinct median longitudinal concavity or even almost sulcus, and apically sometimes barely bilobed; lower rostral tubercle anteriorly sometimes with similar concavity or sulcus in upper portion or even with very small apical median notch, but lateroapical parts of this tubercle always insignificantly projecting (i.e., apical part of latter tubercle always slightly or barely wider than apex of upper tubercle); tegmina with position of RS base somewhat varied; genital plate often with posteromedian part shortly obtuse-angled and sometimes slightly more projected backwards than in holotype.

Female. General appearance as in male paratypes, but body somewhat larger, head without any darkenings, dorsolateral keels of pronotum hardly lower and with barely obtuse-angled dorsal edge of these keels in profile ( Fig. 4 View Figs 1–15 ), tegmina almost three times as long as wide and without well developed stridulatory apparatus, and abdominal apex typical of female in this subgenus and in Peucestes ( Fig. 51 View Figs 38–57 ): last tergite with a pair of long posterior lobules (these lobules clearly longer than cerci), but ninth abdominal tergite practically without posterior lobules; cerci simple (partly fusiform); ovipositor small (reaching apices of lobules of last tergite), slightly curved upwards, with distal part gradually narrowing to narrowly rounded apex, and without drilling denticles; genital plate somewhat elongate and gradually narrowing backwards, and its apical notch approximately as in Fig. 52 View Figs 38–57 .

Length in mm. Body: male 35–40, female 55; body with wings: male 80–85, female 104; pronotum: male 12–14, female 16.5; tegmina 68–72, female 88; hind femora: 30–33, female 39; ovipositor 9.

Comparison. The new species is most similar to S. (S.) validum (including brown coloration of the pronotal disc posterior part, more or less vertical position of the pronotal dorsolateral keels and S-shaped stridulatory vein in the left tegmen), but it is distinguished from the latter species by the lower rostral tubercle barely widening to its apical part (this part is insignificantly wider than the upper rostral tubercle apex; vs: the lower rostral tubercle slightly narrowing to its apex which is almost as wide as the upper rostral tubercle apex), the above-mentioned pronotal keels in male clearly higher (compare Figs 3 and 5 View Figs 1–15 ) and less obtuse-angled in profile (in male of S. validum , the pronotal keels are with the dorsal projections more obtuse-angled than even in female of the new species; see Figs 4 and 5 View Figs 1–15 ), the tegmina slightly narrower (they are about 3.3 times as long as wide in male of the new species, but this ratio in the male holotype of S. validum is approximately 3) and with an almost straight (but not distinctly arcuate) anal edge of the male left tegmen behind its stridulatory vein (near this vein). At least some of the specimens, included by Emsley (1970: figs 23, 113) in S. (S.) validum , in reality may belong to this new species.