Mistshenkoana, Gorochov, 1990

Tan, Ming Kai, Gorochov, Andrei V., Baroga-Barbecho, Jessica B. & Yap, Sheryl A., 2020, New data on some crickets of the subfamilies Landrevinae, Phaloriinae and Podoscirtinae (Orthoptera: Grylloidea) from Laguna (Philippines: Luzon Island), Zootaxa 4809 (1), pp. 29-55 : 39-43

Mistshenkoana ? gracilis

( Figs. 6–8 )

Gorochov (2006): 296 ( Mistshenkoana ? gracilis )

Material examined. 1 male (UPLBMNH-ORT-1330), Philippines, Luzon Island, Laguna, Mount Makiling , N14.14767, E121.23094, 205.5± 7.1 m.a.s.l., 11 April 2018, 2007 hours, on foliage of trees, coll. M. K. Tan, H. Yeo and C. C. Lucañas, pinned and genitalia dissected ( UPLBMNH) ; 1 male (UPLG.19.16), Philippines, Luzon Island, Laguna, Paete , Barangay Ilaya, UP Land Grant, N14.40005, E121.54313, 365.8± 8.3 m.a.s.l., 1032 hours, 12 May 2019, coll. M. K. Tan, J. B. Baroga-Barbecho and S. A. Yap, pinned and genitalia dissected ( ZRC) ; 1 male, same locality, 6–7 September 2019, coll. J. B. Baroga-Barbecho and C. C. Lucañas, pinned and genitalia dissected ( ZRC) .

Other material examined. 1 male, Philippines, Luzon Island, Laguna, Mount Makiling , coll. C. Baker ( NHMUK) .

Comparison with congeners. We compared our specimens with the images of M. gracilis female allotype (MNHN-EO-ENSIF6739) from northwest Panay and male holotype (MNHN-EO-ENSIF6738) from Butuan, Mindanao in MNHN online collection and M.? gracilis from Mount Makiling, Luzon (sensu Gorochov, 2006).

The specimens we collected differ from the M. gracilis holotype by distinct paler colouration of the body compared to tegmina and colour difference between lateral field and dorsal field of tegmen; cells between M and R infumated white near basal part of tegmen, distinct from the darkened dorsal edge and transparent areas between Sc branches (instead of somewhat similar colouration). Our specimens also differ distinctly from the M. gracilis allotype by pale yellow colouration (especially the head, pronotum and legs; rather than pale brown), absence of distinct dark spots on legs (although presence of a few on hind femur); fastigium not darkened; presence of faint longitudinal medial stripe on pronotum dorsum; presence of distinct darkish humeral stripe running from their base to their distal part and distinct colour difference between tegmen and rest of body; dorsal field of tegmen without markings on the cross-veins; cells between M and R infumated white near the basal part of the tegmen; cross-veins of lateral field of tegmen white.

The specimens we collected from Mount Makiling and Paete mostly resemble M.? gracilis from Mount Makiling, Luzon (sensu Gorochov, 2006): dorsal surface of hind tibia with large dark spot in the middle; distinct colour difference between tegmen and rest of body and distinct darkish humeral stripe running from their base to their distal part. Likewise, the male genitalia are also indistinguishable between these specimens.

Therefore, it is possible that M.? gracilis from Mount Makiling (sensu Gorochov, 2006) or the two female syntypes from Mount Makiling (sensu Chopard, 1925) belong to a different undescribed species from the types from Panay.

This species also differs from M. cicur ( Saussure, 1878) from Luzon by pale colouration (especially the head, pronotum and legs), presence of faint longitudinal medial stripe on pronotum; pronotal lobe without dark transverse stripe along hind margin of pronotum; presence of dark lateral stripe on tegmen and distinct colour difference between tegmen and rest of body; cross veins on tegminal not white.

This species also resembles M. bilineata (Chopard, 1954) from Java by pale colouration and faint longitudinal medial stripe on pronotum but differs by shape of phallus (more elongated and slenderer epiphallus than M. bilieanta ) and absence of dark stripe around tegminal dorsal field.

Redescription. Male. Body typical of genus ( Figs. 6 , 7 ). Head rostrum 1.3 times as wide as scapus, 0.8 times as wide as eye, with apex truncated (in dorsal view) ( Fig. 7C ). Scapus elongated ( Fig. 7B ). Eyes distinctly vertically oblong, projected anteriorly ( Figs. 7B, 7C ); median and lateral ocelli very oblong; median ocellus distinctly wider than long and located between scapi; lateral ocellus between postero-inner margin or scapus and anterior margin of eye. Maxillary palpi cylindrical, with apical (fifth) segment elongated, obliquely swollen in middle with truncated apex, longer than third and subapical (fourth) segments; subapical segment slightly widened apically, shorter than third segment ( Fig. 7D ). Posterior of eye above gena finely pubescent. Pronotal disc 0.9 times as long as wide, anterior margin straight, posterior margin distinctly angular in middle ( Fig. 7C ). Pronotal lateral lobe 1.4 times as long as high, finely pubescent and margin with longer and thicker setae ( Fig. 7B ). Fore tibia with large oval and open inner tympanum and without outer tympanum; fore and middle legs generally finely pubescent, with a few stout setae located along ventral margin; without subapical spines on ventral margins.

Male. Tegmen extending beyond abdominal apex; dorsal field longer than lateral field; dorsal field with four main longitudinal veins; basal most vein splits at base on anal side and in middle on basal side; latter splits again in middle at anal side ( Fig. 7E ). Lateral field with many cross veins (some of which fused together) between M and Sc ( Fig. 7A ); Sc with 5 branches with a few cross-veins between branches ( Fig. 7A ). Hind wings surpassing tegmen. Male genitalia as shown in Fig. 8 : epiphallus (ep) elongated, tapering slightly posteriorly, divided into two parts at posterior end and angularly and narrowly excised; posterior end produced into apical epiphallic process. Apical epiphallic process (ep.p) in dorsal view flattened, triangular and pointing posterior-externally with apex obtuse, posterior-inner margin with dense setae; in lateral view with dorsal margin straight and ventral margin concave, apex truncated. Ectoparameres (ecp) in dorsal view elongated, very slender and narrowly forked at posterior end, basally enlarged and appear flattened. Rachis (ra) (= guiding rod) small, slender and straight, with apex acute.

Female. Unknown.

Colouration. Head, pronotum and legs generally yellow green when alive, pale yellow when dry-pinned; tegmen with distinctly different colouration as body. Scapus and antennae with tint of brown. Maxillary palps generally pale, with apical segment darker. Pronotal dorsal disc with anterior and posterior margins brown in middle, with a faint darkened median longitudinal band. Lateral lobe pale, with margins brown. Fore and middle femora yellow green, tibiae and tarsi pale brown. Hind femur yellow green with some small black spots dorsally; knee brown. Hind tibia yellow green (typically darker than hind femur) with a few small black spots, with a broad spot slightly after middle. Tegmen with dorsal field brown, with veins slightly darker; area between M and R including veins black, darkest in middle; area between R and Sc infumated white at basal half, apical half transparent with cross veins infumated white; Sc and branches brown with white margins, cross veins white. Hind wings with cross-veins infumated darkened. Abdominal tergite yellow green, sternite white.

Measurements (in mm). Male (n = 2): BL = 11.4–11.6; PL = 2.2–2.3; PW = 2.4–2.5; TL = 13.3–13.5; HWT = 4.1–4.3; HFL = 9.9; HTL = 9.9.

Figures

FIGURE 6. Mistshenkoana?gracilis (sensu Gorochov, 2006). males in their natural environment.

FIGURE 7. Mistshenkoana?gracilis (sensu Gorochov, 2006) male: habitus in lateral view (A), head and pronotum in lateral (B) and dorsal (C) views, maxillary palps in lateral view (D), tegmen in dorsal view (E). Scale bars: 5 mm (A, E), 1 mm (B–D).

FIGURE 8. Mistshenkoana?gracilis (sensu Gorochov, 2006) male genitalia in dorsal (A), ventral (B) and lateral (C) views.