Macrostylopyga grandis Anisyutkin, Anichkin & Nguyen

Anisyutkin, Leonid N., Anichkin, Alexandr E. & Thinh, Nguyen Van, 2013, Macrostylopyga gen. nov., a new genus of cockroaches (Dictyoptera: Blattidae), with descriptions of two new species, Zootaxa 3635 (5), pp. 520-532: 522-524

publication ID

http://dx.doi.org/10.11646/zootaxa.3635.5

publication LSID

lsid:zoobank.org:pub:5E6A3AFD-89BF-441F-A826-A075C932D42D

persistent identifier

http://treatment.plazi.org/id/8C498792-6720-FFF1-C7B0-F9F9FD1CD34D

treatment provided by

Plazi

scientific name

Macrostylopyga grandis Anisyutkin, Anichkin & Nguyen
status

sp. nov.

Macrostylopyga grandis Anisyutkin, Anichkin & Nguyen   sp. nov.

( Figs. 1 –11 View FIGURES 1 – 11 , 18–22 View FIGURES 12 – 26 , 27–30 View FIGURES 27 – 38 , 39–45 View FIGURES 39 – 49 , 50– 52 View FIGURES 50 – 56 )

Material. Holotype male, Vietnam, Dong Nai Province, Vinh Cuu District, Vinh Cuu Nature Reserve (=Ma Da Forest), TW Cuc Forest Station, 11 ° 22 ’ 51 ’’N, 107 °03’ 44 ’’E, elevation = 75 m, 21–29 November 2010, coll. L.N. Anisyutkin, A.E. Anichkin, A.V. Abramov, S.V. Kruskop (Expedition of the Russia-Vietnam Tropical Centre). Paratypes: 2 males, 5 females, same data as holotype; 1 male, 1 last instar male larva, same locality as the holotype, but 18–27 June 2011, coll. L.N. Anisyutkin, A.E. Anichkin (Expedition of the Russia-Vietnam Tropical Centre).

Description. Male (holotype). Color of dorsum of thorax and abdomen, epicranium (with exception of brownish antennal sockets), proximal parts of antennae, tibiae, tarsi and cerci all piceous black; eyes black; distal part of antennae brownish; anteclypeus, most of labrum, mandibles, maxillary and labial palps dark brown, in some areas yellowish; small areas in proximal and distal parts of labrum whitish; coxae, trochanters, femora, part of abdominal sternites and hypandrium reddish black. Surfaces smooth and lustrous; punctation scarce and weak; facial part of head smooth, without wrinkles ( Fig. 1 View FIGURES 1 – 11 ). Body comparatively wide ( Fig. 3 View FIGURES 1 – 11 ). Head rounded at vertex, longer than wide ( Fig. 1 View FIGURES 1 – 11 ); eyes small; ocellar spots absent; distance between eyes 1.7 times eye length; distance between antennal sockets about 1.5 times scape length (1.9 mm); approximate length ratio of 3 rd – 5 th segments of maxillary palps 1: 0.9: 1.1. Pronotum campaniform, transverse, anterior and lateral margins semicircular, posterior margin weakly projected caudally ( Fig. 3 View FIGURES 1 – 11 ). Mesonotum and metanotum transverse, with weak medial impressions; mesonotum with weak lateral ridges, evidently corresponding to tegminal flaps ( Fig. 3 View FIGURES 1 – 11 ); posterior margins of mesonotum and metanotum sinuate ( Fig. 3 View FIGURES 1 – 11 ). Thoracal tergites and abdominal tergites II –VII marginated laterally ( Figs. 3, 4 View FIGURES 1 – 11 ). Anterior margin of fore femur armed as in type A with 19–22 spines, including 3–4 apical spines. Tibiae not thickened distally, apical spines not reinforced. Structure of hind tarsi ( Figs. 18–22 View FIGURES 12 – 26 ): metatarsus a little longer than other segments combined, with 2 rows of spines along lower margin, exterior row ( Fig. 22 View FIGURES 12 – 26 , e.r.) consisting of 16–18 spines, interior row ( Fig. 22 View FIGURES 12 – 26 , i.r.) with 11–12 spines; second segment with single row of 3–4 spines along lower margin; other segments without spines along lower margin; metatarsus and segments 2–4 with small apical euplantulae and 2 additional spines bordering euplantulae ( Fig. 22 View FIGURES 12 – 26 , a.s.); claws symmetrical, simple; arolium vestigial ( Figs. 19 View FIGURES 12 – 26 , ar., 22). Fore and middle tarsi ( Figs. 20, 21 View FIGURES 12 – 26 ) similar to hind tarsi, but comparatively shorter; fore and middle metatarsi with 11 / 7 and 11–13 / 8–9 spines in exterior/interior rows, respectively, other segments without spines along lower margin. Abdominal tergites without visible glandular specializations ( Figs. 3–5 View FIGURES 1 – 11 ); posterolateral angles attenuate caudally; tergite VI with caudal margin sinusoidally curved ( Fig. 3 View FIGURES 1 – 11 ); tergite VII roundly projected caudally ( Fig. 4 View FIGURES 1 – 11 ). Anal plate (tergite X) medially projected, with triangular median incision on caudal margin ( Fig. 5 View FIGURES 1 – 11 ). Cerci fusiform and flat, with segments solidly connected, partly with margins difficult for observation ( Figs. 5, 11 View FIGURES 1 – 11 ). In living specimens cerci directed upward ( Fig. 8 View FIGURES 1 – 11 ). Paraprocts with asymmetrical hook-like processes on cranio-lateral angles ( Figs. 5, 6 View FIGURES 1 – 11 , pr.). Hypandrium nearly symmetrical ( Fig. 7 View FIGURES 1 – 11 ); anterolateral parts (lateral sternal apodemes or apophyses) comparatively short; caudal margin slightly sinuately curved between styli; styli elongated, fusiform ( Fig. 7 View FIGURES 1 – 11 ).

Male genitalia: left phallomere ( Figs. 27 –30 View FIGURES 27 – 38 , 39– 42 View FIGURES 39 – 49 ) with sclerite L 4 C (L 2 D—here and below the terminology by Grandcolas (1996) is given in the parentheses) large, caudally more or less widened, bent ventrally in cranial part ( Figs. 27, 28 View FIGURES 27 – 38 , c.p.), occupying most of outer sides of phallomere, with rounded outgrowth on outer side ( Figs. 27, 28 View FIGURES 27 – 38 , 39 View FIGURES 39 – 49 , r.o.); process sla simple, directed ventro-medially ( Figs. 27, 29 View FIGURES 27 – 38 , 39 View FIGURES 39 – 49 , sla); sclerite L 3 (L 3 d) compatively slender ( Figs. 27, 28, 30 View FIGURES 27 – 38 ); sclerite L 4 F, possibly L 4 E+L 4 F, comparatively small ( Fig. 28 View FIGURES 27 – 38 ); sclerite L 4 D (L 3 v) elongated ( Fig. 28 View FIGURES 27 – 38 ); sclerite L 2 (L 2 v) large, occupying ventral and lower half of inner sides of phallomere ( Figs. 29, 30 View FIGURES 27 – 38 ), terminating in apically curved caudal process ( Fig. 30 View FIGURES 27 – 38 , a.p.), with rounded membranous lobe above this process ( Fig. 29 View FIGURES 27 – 38 , r.m. l.); “additional complicated sclerite”( Fig. 29 View FIGURES 27 – 38 , a.c.s.) with short dorso-caudal projection ( Figs. 27–30 View FIGURES 27 – 38 , d.c.p.) situated above rounded membranous lobe of L 2 on inner side of phallomere; this sclerite connected with slightly sclerotized lobe on upper half of inner side of phallomere ( Figs. 27, 29 View FIGURES 27 – 38 , s.l.); weakly sclerotized transverse plate situated on caudal side of phallomere ( Figs. 27, 28 View FIGURES 27 – 38 , 39, 40 View FIGURES 39 – 49 , t.p.), this plate mostly covered with membranous lobes on caudal side of phallomere; sclerite L 1 large, tripartite caudally ( Figs. 39, 41, 42 View FIGURES 39 – 49 ). Ventral phallomere L 4 G (VP) as in Figs. 43, 44 View FIGURES 39 – 49 , distinctly widened and bent upward caudally, with impression in medial part ( Fig. 44 View FIGURES 39 – 49 , m.i.). Right phallomere complex in shape, as in Figs. 50, 51 View FIGURES 50 – 56 ; basal sclerite (R 2) rounded and dorsoventrally compressed, with transverse groove; cranial part of sclerite R 1 H in shape of transverse plate ( Fig. 52 View FIGURES 50 – 56 , c.p.), caudal part comparatively short, hook-like; R 1 H fused with complicated sclerite R 1 G ( Figs. 50, 51 View FIGURES 50 – 56 ); platelike curved sclerite R 3 situated craniolaterally ( Figs. 45 View FIGURES 39 – 49 , 50, 51 View FIGURES 50 – 56 ).

Variations. Male paratypes similar to the holotype, but color sometimes slightly lighter and tarsi reddish. Distance between antennal sockets 1.4–1.6 times scape length; approximate length ratio of third –fifth segments of maxillary palps 1: 0.9–1: 1.1–1.3. Anterior margin of fore femur with 13–22 spines, including 2–4 apical spines. Fore, middle and hind metatarsi with 11– 12 / 6 –7, 10– 14 / 7–9 and 12–18 / 6–12 spines in exterior/interior rows respectively. Second segment of hind tarsus with 2–4 spines in single row. In one specimen cerci abnormally short (probably due to damage in larval stage): left cercus slightly longer, right one about as long as length of anal plate.

Females (paratypes). Similar to males. Head as in Fig. 2 View FIGURES 1 – 11 ; distance between eyes 1.6–2.1 times eye length; distance between antennal sockets 1.5–1.7 times scape length; approximate length ratio of 3 rd – 5 th segments of maxillary palps 1–1.1: 1: 1.2. Anterior margin of fore femur with 18–21 spines, including 2–3 apical spines. Fore, middle and hind metatarsi with 11– 14 / 5 –7, 11– 12 / 6–9 and 12–17 / 8–12 spines in exterior/interior rows respectively; first and second segments of hind tarsus with 2–4 spines in single row. Abdominal tergite VII with caudal margin sinusoidal curved ( Fig. 8 View FIGURES 1 – 11 ). Anal plate (segment X, ultimate tergite) ( Figs. 8, 9 View FIGURES 1 – 11 ) with triangular median incision on caudal margin. In living cockroaches cerci directed upward. Paraprocts simple, comparatively large, without cranio-lateral processes ( Figs. 8, 10 View FIGURES 1 – 11 , par.). Genital plate as in Fig. 10 View FIGURES 1 – 11 , valves comparatively small.

Male nymph (probably last instar). Similar to adult males, but color lighter: abdomen ventrally reddish brown, femora, trochanters and tibiae yellowish brown. Hook-like cranio-lateral processes of paraprocts small and symmetrical.

Measurements (mm). Head length: male 7.4–8.4 (8.4), female 7.9–8.8; head width: male 6.0–7.0 (7.0), female 5.9–6.8; pronotum length: male 9.8 –12.0 (12.0), female 10.2 –12.0; pronotum width: male 12.2 –15.0 (15.0), female 12.8–15.4; mesonotum length: male 5.8–7.3 (7.3), female 6.2–7.8; mesonotum width: male 13.5–16.2 (16.2), female 14.5–16.8; metanotum length: male 5.0– 6.9 (6.9), female 5.2–6.5; metanotum width: male 12.8–16.5 (16.5), female 14.2–16.8. Measurements in parentheses are those of holotype.

Comparison. The new species can readily be distinguished from M. bidupi   sp. nov. and M. laosana   by the larger size, the structure of paraprocts (the presence of hook-like cranio-lateral processes—Fig. 6, pr.) and the male genitalia: shape of the sclerites L 4 C, L 4 F, L 2, L 1 (compare Figs. 27–30 View FIGURES 27 – 38 and Figs 31–38 View FIGURES 27 – 38 ) and shape of the process of R 1 H (compare Figs. 50–52 View FIGURES 50 – 56 and Figs. 53–56 View FIGURES 50 – 56 ).

Note. All specimens were collected at night, mostly on soil; one male and one female were collected on the trunk of a large tree not far from ground level.