Endecous ( Pedroecous ) didymus, Castro-Souza & Zefa & Ferreira, 2020

Endecous ( Pedroecous) didymus n. sp.

(Figures 2–7, 8–15, 16–19, 20–25, 26–33, 34, 35, 37–40, 75–77, 81–83, 87, 89–95, 96, 98, 100, 107, Tables 1–4)

Material Examined: Holotype, ♂, ISLA 43330, Brazil, Minas Gerais State, Luislândia municipality, Lapa Sem Fim cave ( 16° 08’ 55”W, 44° 37’ 40”S), 18.iv.2017, L. M. Rabelo, leg. GoogleMaps Holotype condition: head, left legs I, II, III, and right tegmen were detached, and maintained in holotype’s tube . Paratypes, 2 ♂♂, 17.iv.2014, ( ISLA 12341; 12343), R. L. Ferreira, Leg .; 2 ♂♂, 15.iv.2016, (ISLAs 15696; 15697) R. L. Ferreira, Leg .; 10 ♂♂, 18.iv.2017, ( ISLA 43329; 43331; 43332; 43333; 43336; 43337; 43338; 43339; 43340; 43341) L. M. Rabelo, leg. ; 1 ♀, 17.iv.2014, ( ISLA 12342) R. L. Ferreira, leg. ; 2 ♀♀, 18.iv.2017, ( ISLA 43334; 43335), R. L. Ferreira, Leg., all specimens col- lected in the same locality of holotype .

Distribution: Lapa Sem Fim cave ( Fig. 107 View FIGURE 107 ), municipality of Luislândia, Minas Gerais State, Brazil ( Fig. 1A, B View FIGURE 1 ).

Etimology: Specific epithet “ didymus ” from the Greek, refers to “twin”, due to the morphological similarity between this species and Endecous ( Pedroecous) troglobius n. sp., also described in this study.

Diagnosis. Combination of the following characteristics: phallic complex short and narrow in general view ( Figs 75–77, 81–83 View FIGURES 75–86 ); pseudepiphallic membranous shield short (Fig. 3, Ps.ms); pseudepiphallus dorsal branch long, hook-shaped, curved inward and rounded at apex (Figs 2, 6–7, Ps.db); pseudepiphallic arm field small ( Figs 81–83 View FIGURES 75–86 , blue slice); ectophallic arc well developed, U-shaped in ventral and previously inclined in dorsal view (Fig. 4, Ect. Arc); endophallus developed (Figs 5–7, End.Sc.a, yellow arrow indicates the apodeme); compound eyes with black ommatidia ( Figs 8–9 View FIGURES 8-15 ); courtship song dominant frequence (DF), 3.3–3.6 kHz (max-min), n = 4 ( Tab. 3).

Description, male holotype. Body color: dorsal head, pronotum and right tegmen yellowish-orange brownish ( Figs 8–12 View FIGURES 8-15 ), whitish ventrally, abdomen yellowish brown ( Figs 12–13 View FIGURES 8-15 ), entire legs brownish, except femora base whitish ( Figs 16–19 View FIGURES 16-19 ), cerci uniformly brownish. Head: slightly pubescent, elongated in frontal view ( 3.9 mm length and 2.9 mm width), vertex slightly marked with four stripes reaching occiput, with the central stripe having a slight double branching; gena, clypeus, frons and labrum whitish, mandibles brown whitish, dark brown and sclerotized at border and apex; the first two maxillary palpomeres whitish, with the same size, both together are smaller than the third, which in turn is the same size as the fourth; fifth palpomere slightly longer than fourth, claviform, slightly arched, and darker at the tip; first, second and third labial palpomeres of increasing size, the third is pubscent, claviform and slightly darker at the tip; scape, pedicel and antennomeres uniformly brownish and pubescent, the region between the antennae has well developed bristles; compound eyes with black ommatidia, with a depigmented field where scape fits; ocelli absent ( Figs 8–9 View FIGURES 8-15 and 87 View FIGURES 87–88 ). Thorax. Pronotum slightly pubescent, dorsal disc wider than longer, marked with a longitudinal median stripe, and long bristles on anterior and posterior margin; lateral lobes rounded, without bristles ( Figs 10, 12 View FIGURES 8-15 ). Leg I: femur and tibia same size; tibia with an oval auditory tympanum at inner side, and one pair of subigual ventroapical spurs; first tarsomere serrulated, larger than the second and third tarsomeres ( Figs 18–19 View FIGURES 16-19 ). Leg II: tibia armed with a pair of inner and outer apical spurs, dorsal smaller ( Figs 18, 19 View FIGURES 16-19 , λ, μ). Leg III: femur dilated, whitish at the base; tibia serrulated, as longer as femur, and armed with three inner ( Fig. 17 View FIGURES 16-19 , α, β and γ) and four outer subapical spurs ( Fig. 16 View FIGURES 16-19 , w, x, y and z) the distal is smaller ( Fig. 16 View FIGURES 16-19 , z), and four api- cal spurs at inner ( Fig. 17 View FIGURES 16-19 , d, e, f and g) and three at outer side ( Fig. 16 a, b, c View FIGURES 16-19 ); first tarsomere is serruleted distally and larger than the third and second in size, respectively, with one pair of apical spurs, the inner longer ( Figs 16–17 View FIGURES 16-19 , δ, θ). Right tegmen covering the first four abdominal tergites ( Fig. 12 View FIGURES 8-15 ); mirror: rounded with three crossvein and four cells, the second distal cell present one crossvein bifurcate, forming two small cell couple, first distal cell with one slightly marked diagonal vein; harp: with five well marked crossveins, and six cells, the first distal cell has a diagonal anal vein; lateral field: marked by reticular accessory veins, some are forked; basal field: with veins 1A, 2A and 3A well-marked, with four secondary veins connected to CU 2, the first is forked; 2A and 3A vein bifurcated ( Figs 11 View FIGURES 8-15 , 20 View FIGURES 20–25 ); stridulatory file with 68 teeth. Abdomen: cerci long ( 14.9 mm ± 1.7 mm) and pubescent, mainly in the base; supranal plate short, rounded at apex, with lateral projections small, brown with white spots ( Figs 13, 15 View FIGURES 8-15 ); subgenital plate short, whitish and rounded, base lightly squared ( Figs 13–14 View FIGURES 8-15 ).