Phidon chanco sp. nov.

(Figs. 1–11)

Type material: Holotype: ♂ — Chile, Región del Maule, Cauquenes Province, Los Queules National Reserve, I-2016, col. R. Barahona, pitfall trap (ethanol 70%), MNNC . Paratypes: 1♀ — same date of holotype, may be in copula (ethanol 70%), MNNC . 5♀ and, 5♂ — Chile, Región del Maule, Cauquenes Province, Chanco 24-I to 16-II- 1999, pitfall trap (dry and pinned), MNNC .

Other material examined: 1 ♀ (dry and pinned), Chile, Región del Maule, Cauquenes Province, Pelluhue 18- IX to 20-IX-1985, col. F. Silva ; 6 ♂ and 6 ♀ (dry and pinned), 18 nymphs (ethanol 70%), Chanco 24-I to 16-II-1999 , pitfall trap; 1 ♂ (ethanol 70%) Los Ruiles National Reserve, I-2017, col. C. Cifuentes ; 1 nymph (ethanol 70%), Los Queules National Reserve, I-2016 , col. R. Barahona, pitfall trap ; 7 ♂, 3 ♀ (ethanol 70%), same locality, III-2017; 3 ♂ (ethanol 70%), same locality, IV-2017 .

Diagnosis: both sexes brachypterous; male tegmina not covering tergite X, both join but do not overlap in the dorsal midline of the body in resting position, wings reduced; female tegmina subtriangular, not covering metanotum, wings absent; male specialization in tergite VII as a reniform depression densely pubescent; hypandrium with sclerotised median triangle, prominent and strongly armed with denticles at the apex; genitalia with L 4V large, with helicoidal apex; female tergite X with emarginate apex.

Description of male: Measurements in Table 1. General coloration (Figs. 1 A–C): body and legs pale brownish-yellow, almost translucent, eyes black, forehead brown, dorsal side of tibiae brown-based, cerci dorsally brown. Pronotum with bands and dots as in Figure 1C, meso and metanotum with four dots, abdominal tergites and sternites with a dot on each side (Figs. 1 A–C). Tegmina translucent, with soft brown veins.

Head: subtriangular as long as wide (Fig. 2A); distance between eyes on vertex 1.3 times the eye length; distance between antennal sockets about 2 times scape length; two small ocelli; flat clypeus; anteclypeus divided (Fig. 2B); labrum with rounded margin. Mouthparts: Mandibles as in Figure 2C; left mandible with three incisives, incisives I+II fused at their bases, incisive III with auxiliary subapical tooth, premolar tooth prominent; right mandible with three triangular incisives. Labium (Fig. 2D) with square submenton, short menton, prementon divided in two subtriangular sclerites, Ratios of relative lengths of palpomeres I–III equal to 2: 1.5: 3.5. Maxilla (Fig. 2E) with triangular lacinia as long as wide basally, with two incisives, stipes 1.5 times as long as lacinia, lacinula with long base and three long teeth (Fig. 2F), ratios of relative lengths of palpomeres III–V equal to 1: 1.5: 1.5.

Thorax: pronotum parabolic as in Figure 1 A – C; head barely surpasses the anterior margin. Legs as in Figure 3; fore femur type B 3; claws simple and symmetrical, arolium large; all legs with pulvilli in tarsomeres I – IV. Tegmina: subtriangular (Fig. 4 B–D), they join in a straight line on the abdomen, their length does not exceed the tergite VIII (Fig. 1–3); R with one proximal and three distal veins with one bifurcations (Fig. 3); CuP extending approximately half the length of the tegmina; cross veins weakly marked (Fig. 4); remigium with intercalary veins. Wings: reduced (Fig. 4B), with anal region bent as fan; never overlap dorsally at the resting position.

Abdomen: tergites VI–IX with posterior margin medially emarginate (Fig. 5A, 5C). Tergite VII specialization with a medial reniform hole, and long setae extending from a medial to an anterior tubercle, with its apex is curved and flat (Fig. 5B), other setae are directed from the depression wall towards the center (Fig. 5D). Anal plate with posterior margin triangular (apex emarginate) little sclerotised (Fig. 6E). Paraprocts: as in Figure 5E. Cerci: short, with 10–11 segments. VIII sternite asymmetrical apodemes (Fig. 6C). Hypandrium: with asymmetrical apodemes, right apodeme acute and half the length of the left (Fig. 6D); posterior margin with laminar styli subsymmetrical and hirsute (Fig. 6G), this are articulated and cover the median triangle (Fig. 6F); median triangle long, curved (Fig. 6A) and dilated apex with numerous denticles (Fig. 6B).

Male genitalia (Figs. 7–8): phallomeres with sclerites as in Figure 7; the conservative complex show L 3 in right position, r.plm reduced to two little sclerites and L2D in median position; the most complex structure is the medium lobe with a large L 4V and two labile areas with denticles and setae (c.b.f., c.b.m.a). L3 as in Figures 8I, 8J; L 2D as in Figures 8 E–H, distal end bend with lateral tubercle (Fig. 8H), membranous apex with denticles (Figure 8F, 8H); L 4V as in Figures 8 A–D, 2/3 of the length of L2D, apex helicoidal dextrogyrus, armed with numerous denticles.

Description female: similar to male but wider. Measurements in Table 1. General coloration: similar to male (Figs. 1 D–F), but more brownish; abdominal tergites and sternites brown. Brachypterous, tegmina as in Figure 4A, subtriangular, apex reaching at most half of the metanotum (Fig. 1D, 1F). Wing absent.

Abdomen: tergite X with apex narrow and emarginate (Fig. 9A). Posterior margin of genital plate weakly emarginate medially (Fig. 9B). Paraproct spatulated with large membranous medial region in ventral view (Fig. 10).

Genitalia: vestibulum with dorsal complex sclerites (Fig. 10), with fused V-shaped intercalary sclerite (is); pt symmetrical; Pl like a prominent rounded tubercle; acute valves; bsvd poorly sclerotised in the middle. Ventral complex sclerites as in Figure 11, bsvv with large posterior arms, fused at the base forming a sclerotised fork; Ls like a sclerotised fork posterior arms have a groove forming a sheet covered with setae next to the gonopore; anterior extreme of Ls sclerotised with shovel form. Anterior ventral complex forming a bursa copulatrix (bc) between anterior sclerites from Ls and bsvv. Inside the bc a membranous lobe independently carries the two openings of the spermathecae (Fig. 11C). The spermathecae are two small spherical and weak bags, next to the anterior bsvv sclerite (Fig. 11B).

Etymology: a name in apposition alluding to Chanco, the Chilean locality where most of the studied specimens were collected.