Duchailluia ivindo Anisyutkin, 2018

Anisyutkin, Leonid N. & Telnov, Dmitry, 2018, New data on the cockroaches previously attributed to the genus Duchailluia Rehn, 1933 (Dictyoptera: Blattidae: Blattinae), Zootaxa 4532 (4), pp. 523-538 : 525-526

Duchailluia ivindo Anisyutkin , sp. nov.

( Figs. 1 A–K, 2A–D, 3A–D)

Zoobank: http://zoobank.org/ 62E3B78F-963C-4A80-A4A9-D6C5A37A06BE

Material: Holotype. male, GABON E, prov. Ogooué-lvindo , Makokou 5–9 km SW, Ivindo NP, lpassa forest research station (0°30'52''N, 12°48'21''E), 3–4 km around, h= 480–540 m, 14–15 June 2016, secondary lowland rainforest, night collecting from decaying wood, leg. D. Telnov ( NME), genital complex in prep. 250517 /02; paratype. 1 male, same data as holotype ( ZIN), genital complex in prep. 250517 /02.

Etymology. Toponymic. The new species is named after the Ivindo River, the main river in E Gabon and Ivindo National park. Noun in apposition.

Description. Male (the holotype). Body generally reddish brown; eyes black; areas of ocellar spots yellowish ( Fig. 1A ); proximal parts of antennae, maxillary and labial palps, and legs darker, nearly black. Surfaces smooth and lustrous; punctation virtually invisible; facial part of head with very delicate wrinkles above clypeus (not shown in Fig. 1A ); antennae dull in distal parts (approximately from 15th segment). Head rounded at vertex, longer than wide, convex ( Fig. 1A ); epicranial sutures not indicated; eyes small; ocellar spots visible only as light spots; distance between eyes 1.5 times eye length; distance between antennal sockets 2.1 times of the scape length (about 0.8 mm); approximate length ratio of 3rd–5th maxillary palpomeres 1.1: 1.0: 1.0. Pronotum campaniform, wider than long, widely rounded along anterolateral margins, caudal margin slightly angulate ( Fig. 1B ). Tegmina reduced to lateral flaps, marginated laterally and truncated apically ( Fig. 1B ). Wings absent. Mesonotum and metanotum transverse, slightly convex dorsally, with very delicate ridges; posterior margins weakly angulate ( Fig. 1B ). Thoracal tergites and abdominal tergites II–VII marginate laterally ( Fig. 1B, C , not shown in Fig. 1C ). Anterior margin of fore femur armed as in the type A, with 14–15 spines, including 2–3 apical ones. Fore tibiae not thickened distally. Tibial spines well developed. Structure of hind tarsi ( Fig. 1 D–F): metatarsus a little longer than other segments combined, with small and apical euplantula ( Fig. 1D, E ); metatarsus and 2 nd segment with 2 more or less equal rows of spines along its lower margins; large euplantulae of 2 nd -4 th segments; metatarsus and 2 nd –4 th segments with pair of apical "additional spines" bordering euplantulae laterally ( Fig. 1E, a.s .); claws symmetrical, simple; arolium about half of claw length ( Fig. 1D, F ). Fore- and mid tarsi similar to metatarsi, but segments comparatively shorter. Abdomen without visible glandular specializations; posterolateral angles attenuate caudally; tergite VI with caudal margin sinusoidally curved ( Fig. 1C ); tergite VII projected caudally ( Fig. 1C ). Anal plate (tergite X) medially projected, with weak triangular median incision on caudal margin ( Fig. 1C, G ). Cerci fusiform and flat, with segments solidly connected ( Fig. 1C, G ). Paraprocts weakly asymmetrical, sclerotized along caudal margin ( Fig. 1H ); pv–sclerites well sclerotized, elongated not shown in Fig. 1H . Hypandrium weakly asymmetrical, wide, antero-lateral parts (lateral sternal apodemes or apophyses) comparatively short; caudal margin sinuate between styli ( Fig. 1I ); styli nearly symmetrical ( Fig. 1 I–K), slightly curved down ( Fig. 1K ), with simple lobe at inner side.

Male genitalia ( Figs. 2 A–D, 3A–D): left phallomere ( Fig. 3 A–D) with sclerite L4C (L2D—here and below the terminology by Grandcolas (1996) is given in the parentheses) large, caudally divided into two parts, which terminating in apically curved upward processes ( Fig. 3 A–C, a.c.p.); sclerite L3 (L3d) contracted and curved in apical part, with small directed upward tooth; sclerite L4F, possibly L4E+L4F, large, plate-like, occupying lower half of outer ( Fig. 3B ) and partly lower ( Fig. 3D ) sides of phallomere; sclerite L4D (L 3v) elongated ( Fig. 3B, C ); sclerite L2 (L 2v) elongated, occupying ventral and lower half of inner sides of phallomere ( Fig. 3 B–D), terminating in acute caudal process ( Fig. 3B, a.p .); large "additional elongated sclerite", probably separated part of L2, situated on inner side of phallomere dorsally to L2 ( Fig. 3C, a.e.s .), terminating in forked caudal process ( Fig. 3 A–D, f.c.p.) and rounded membranous lobe ( Fig. 3C, r.m.l .); this sclerite connected with slightly sclerotized lobe on upper half of inner side of phallomere ( Fig. 3C, s.l .); sclerite L1 absent, substituted by membranous lobe. Ventral phallomere L4G (VP) as in Fig. 2D . Right phallomere complex in shape, as in Fig. 2 A–C; basal sclerite (R2) small, as compared with other sclerites of right phallomere, and transverse; sclerite R1H long and curved, apically forked; sclerite R1G subtriangular in shape, with two apical teeth ( Fig. 2A, B, a.t .) and dorsal setal brushes ( Fig. 2A, C, s .br.); sclerite R3 plate-like. Elongated lobe densely covered with bristles situated under right paraproct ( Fig. 1H, s .lobe.), it not connected with genital sclerites.

Variations. Male paratype generally similar to the holotype, but slightly smaller. Approximate length ratio of 3rd–5th segments of maxillary palps 1.2: 1.0: 1.1.

Female is unknown.

Measurements (mm). Head length: 3.9–4.2 (4.2), width 3.3–3.7 (3.7), pronotum length 4.5–5.0 (5.0), width 6.4–7.2 (7.2), mesonotum length 2.0–2.2 (2.2), tegmina length 2.8–3.0 (3.0), width 1.5 (1.5), metanotum length 1.9–2.2 (1.9), width 7.3–7.9 (7.9). Measurements in parenthesis are those of holotype.

Comparison. Beccaloni (2014) listed 9 African species in the genus Duchailluia : D. anthracina ( Gerstaecker, 1883) , D. assimilis ( Shelford, 1908) , D. congoensis ( Shelford, 1911c) , D. furcifera ( Shelford, 1908) , D. manca ( Gerstaecker, 1883) , D. nigerrima ( Shelford, 1908) , D. shelfordi ( Jolivet, 1954) , D. spinulifera ( Krauss, 1890) and D. togoensis ( Shelford, 1911a) . The new species readily differs from D. assimilis , D. furcifera , D. manca , and D. nigerrima in shape of anal plate and hypandrium (compare Fig. 1 G–K and Figs. 1–4 in Shelford 1908). From D. anthracina the new species differs in shape of caudal margin of anal plate, which is weakly emarginated ( Fig. 1G ), not "produced to a point", as indicated for D. anthracina by Shelford (1908, p. 32). Duchailluia spinulifera does not have bifurcate styli ( Shelford 1908), contrary to D. ivindo sp. nov. From D. togoensis the new species differs in shape of caudal margins of anal plate, hypandrium and inner branch of styles (compare Fig. 1G , I–K and Fig. 2 in Shelford 1911a). From D. congoensis the new species differs in shape of tegmina, which is elongated ( Fig. 1B ), not "broader at base than long", as indicated for D. congoensis by Shelford (1911a, p. 201) and nearly symmetrical styles ( Fig. 1 I–K). From D. shelfordi the new species differs in more light colour and distinctly protruded caudal margin of pronotum ( Fig. 1B ), not straight, as indicated for D. shelfordi by Jolivet (1954).

Note. The field research was carried out in June 2016 in a dry season. Described material comes from an oldgrowth secondary lowland rainforest. Specimens were sampled from upper surface of a large fallen tree (trunk) at morning time (collecting area was partly in shade; at midday this area is fully sun exposed). The trunk was lying horizontally on the ground, with bark partly strongly attached to the trunk, partly loose. Specimens sampled from underside of the trunk.

Figures

FIGURE 1. Duchailluia ivindo Anisyutkin, sp. nov., male, holotype. A—facial part of head; B—head, thorax and first abdominal tergite from above; C—abdomen (with exception of first abdominal tergite) from above; D—left hind tarsus from outside; E—1st–4th segments of left hind tarsus from below; F—arolium and claws of left hind tarsus; G—abdominal apex from above; H—abdominal apex from below, hypandrium and genitalia removed; I—hypandrium from below; J—caudal margin of hypandrium from above; K—left stylus from outside. Dotted areas shows membranous parts. Dotted line in Fig. 1A delimits areas of ocellar spots. Abbreviations: I–VII—1st–7th abdominal tergites respectively, a.s., par., s.lobe.—see text. Scale bar 1 mm: a = A; b = B, C; c = D; d = E; e = F; f = G; g = H; h = I; i = J, K.

FIGURE 2. Duchailluia ivindo Anisyutkin, sp. nov., male genitalia, holotype. A–C—right phallomere from above (A), below (B) and outside (C); D—ventral phallomere from below. Dotted areas shows membranous parts. Abbreviations: a.t., R1G, R1H, R2, R3, s.br.—see text. Scale bar 1 mm.

FIGURE 3. Left phallomere of the male genitalia (holotypes): from above (A, E, I), outside (B, F, J), inside (C, G, K) and below (D, H); L—left phallomere from below, partly. A–D—Duchailluia ivindo sp. nov.; E–H—Distylopyga beccalonii sp. nov.; I–L—Neostylopyga yemenica (Bey-Bienko, 1969). Dotted areas shows membranous parts. Abbreviations: a.c.p., a.e.s., a.p., b.p., d.c.p., d.l., f.c.p., L2, L3, L4C, L4D, L4F, m.l., r.m.l., s.l., t.f., v.l.—see text. Scale bar 1 mm: a = A–D; b = E–H; c = I– L.