Distylopyga beccalonii 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 : 531-533

Distylopyga beccalonii Anisyutkin , sp. nov.

( Figs. 3 E–H, 4A–N, 5A–E)

Zoobank: http://zoobank.org/ D2BE030B-0DE1-4573-9FC5-FD2336C5EECD

Material: Holotype. male, THAILAND, prov. Phetchaburi, 50 km SW town Phetchaburi, environs of National Park Kaeng Krachan , forest near reservoir, h= 400 m, 30–31 July1996, leg. A. Gorochov ( ZIN); paratypes. 3 females, 1 larva, same data as holotype, but 30 July–1 August 1996 ( ZIN); paratypes. 2 females, same data as holotype, but 3–5 August 1996 ( ZIN).

Etymology. Patronymic. This species is named in honour of Dr. George Beccaloni (the Alfred Russel Wallace Trust, United Kingdom), famous specialist in cockroach taxonomy and establisher of Cockroach Species File database.

Description. Male (the holotype). Body generally reddish brown, head slightly darker; eyes black; areas of ocellar spots pale yellowish ( Fig. 4A ); scapus and pedicellum, labrum, anteclypeus, maxillary and labial palps dirty yellow; antennae (scapus and pedicellum excluded), greyish brown; legs yellowish brown. Surfaces smooth and lustrous; punctation very delicate; facial part of head with delicate wrinkles above clypeus (not shown in Fig. 4A ); distal antennomeres dull (approximately from 10th segment). Head rounded at vertex, longer than wide, convex ( Fig. 4A ); epicranial sutures not indicated; eyes small; ocellar spots small, visible only as light spots; distance between eyes 1.7 times eye length; distance between antennal sockets 2.4 times of the scape length (about 0.5 mm); approximate length ratio of 3rd–5th segments of maxillary palpomeres 1.0: 1.0: 1.3. Pronotum campaniform, wider than long, caudall margin slightly angulate ( Fig. 4B ). Tegmina reduced to lateral flaps, marginated laterally and truncated apically ( Fig. 4B, C ). Wings absent. Mesonotum and metanotum transverse, dorsally slightly convex, with posterior margins slightly angulate ( Fig. 4B ). Thoracal tergites and abdominal tergites II–VII marginate laterally ( Fig. 4B, C ). Anterior margin of fore femur armed as in the type A, with 14–15 spines, including 3 apical ones. Fore tibiae not thickened distally. Tibial spines well developed. Structure of hind tarsi ( Fig. 4 D–F): metatarsus a little longer than other segments combined; all euplantulae small and apical ( Fig. 4D, E ); metatarsus and 2nd metatarsomere with 2 more or less equal rows of spines along its lower margin; 3rd metatarsomere with 2 spines along lower margin; metatarsus and 2nd–4th metatarsomeres with 1–2 "additional spines" bordering euplantulae from inside and outside ( Fig. 4D, E, a.s .); claws symmetrical, simple; arolium smaller than half of claw length ( Fig. 4F ). Fore- and mid tarsi similar to metatarsi, but with comparatively shorter tarsomeres. Abdomen without visible glandular specializations; posterolateral angles attenuate caudally; tergite VI with caudal margin straight ( Fig. 4B ); tergite VII roundly projected caudally. Anal plate (tergite X) short and transverse, medially projected, with very weak triangular median incision on caudal margin ( Fig. 4G ). Cerci fusiform and flat, with solidly connected segments ( Fig. 4H ). Paraprocts weakly asymmetrical, sclerotized along caudal margin; pvsclerites well sclerotized, elongated ( Fig. 4G , pv.). Hypandrium weakly asymmetrical, wide, antero-lateral parts (lateral sternal apodemes or apophyses) short; caudal margin sinuate between styli ( Fig. 4 I–K); styli asymmetrical: left stylus with 4 small curved spines, right stylus with 2 longer ones.

Male genitalia ( Figs. 3 E–H, 5A–E): left phallomere ( Fig. 3 E–H) with sclerite L4C (L2D) long and narrow, caudally divided into two partly membranous parts, outer one terminating in oppositely directed sharp teeth ( Fig. 3E, G, a.c.p .); sclerite L3 (L3d) curved in apical part, with small cranially directed tooth; sclerite L4F, possibly L4E+L4F, large, with indistinct margins ( Fig. 3F ); sclerite L4D (L 3v) elongated ( Fig. 3F, G ); sclerite L2 (L 2v) long, narrowed in cranial part ( Fig. 3G, H ), terminating in 2 acute caudal processes: inner process short and apically forked, outer—long and slender ( Fig. 3E, G, H, a.p .); "additional elongated sclerite", probably separated part of L2, situated on inner side of phallomere dorsally to L2 ( Fig. 3G, a.e.s .), terminating long and slender caudal process ( Fig. 3 E–F, f.c.p.) and subtriangular membranous lobe ( Fig. 3G, H, m.l .); "additional elongated sclerite" connected with complicate sclerite with dorso-caudal projection ( Fig. 3G, d.c.p .); sclerite L1 absent. Ventral phallomere L4G (VP) short and wide ( Fig. 5D, E ). Right phallomere complex in shape, as in Fig. 5 A–C; basal sclerite (R2) small, as compared with other sclerites of right phallomere; sclerite R1H divided into 2 branches: inner branches apically forked ( Fig. 5A, R 1 Hi), outer with apex bent down ( Fig. 5A, R 1 Hout.), additional long spine-like process situated above outer branch ( Fig. 5A, a.p .); sclerite R1G subtriangular in shape, with blunt apical tooth ( Fig. 5A, B, a.t .); sclerite R3 large, plate-like.

Female. Similar to male. Maxillary and labial palps sometimes grey, legs—reddish brown. Head as in Fig. 4L ; distance between eyes 1.6–1.7 times eye length; distance between antennal sockets 2.1–2.5 times of the scape length (about 0.5–0.6 mm); approximate length ratio of 3rd–5th segments of maxillary palps 1.0: 1.0: 1.3–1.4. Thoracal and abdominal tergites as in Fig. 4M . Anterior margin of fore femur armed as in the type A, with 14–15 spines, including 2–3 apical ones. Abdominal apex as in Fig. 4M . Genital plate transverse, valves large ( Fig. 4N ).

Larva. Similar to adult male, but paler: antennae, anteclypeus, maxillary and labial palps and partly legs yellow.

Measurements (mm). Head length: male 2.5, female 2.8–3.0; head width: male 2.3, female 2.4–2.6; pronotum length: male 3.3, female 3.4–3.7; pronotum width: male 4.5, female 4.4–4.7; mesonotum length: male 1.7, female 1.8–2.0; tegmina length: male 1.9, female 1.6–2.0; tegmina width: male 1.1, female 0.9–1.1; metanotum length: male 1.2, female 1.3–1.6; metanotum width: male 5.1, female 5.0–5.4.

Comparison. The new species differs from D. semoni in generally paler body (black in S. semoni ) and distinctly angulate caudal margin of metanotum ( Fig. 4B ) (emarginated in S. semoni ).

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 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.

FIGURE 4. Distylopyga beccalonii Anisyutkin, sp. nov., male, holotype (A–K) and female, paratype (L–N). A, L—facial part of head; B—head, thorax and six abdominal tergites from above; C—left tegmen from side; 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, only bases of cerci are shown; H—right cercus from inside; I—hypandrium from below; J, K—caudal margin of hypandrium from above (J) and caudal (K); M—general view from above; N—genital plate from below. Dotted areas shows membranous parts. Dotted line in Fig. 4A, L delimits areas of ocellar spots. Abbreviations: I–X—1st–10th abdominal tergites respectively, a.s., par., pv.– see text. Scale bar 1 mm: a = A, L; b = B; c = C; d = D; e = E; f = F; g = G, H; i = J, K; j = M; k = N.

FIGURE 5. Distylopyga beccalonii Anisyutkin, sp. nov., male genitalia, holotype. A–C—right phallomere from above (A), below (B) and outside (C); D, E—ventral phallomere from below (D) and side (E). Dotted areas shows membranous parts. Abbreviations: a.p., a.t., R1G, R1Hi., R1Hout., R2, R3—see text. Scale bar 1 mm.