Depressacca kinabalu, Ingrisch, 2020

Ingrisch, Sigfrid, 2020, New subgenera and species of Agraeciini (Orthoptera, Tettigoniidae, Conocephalinae) from South Asia found in historical insect collections, Evolutionary Systematics 4 (2), pp. 119-132 : 119

Depressacca kinabalu sp. nov. Fig. 7A-J

Holotype

(male). East Malaysia: Sabah, Mt. Kinabalu, Mesilau (6°10'N, 116°39'E), at light, 4.ii.1964, coll. J. Smart, Royal Soc. Exped. - depository: BMNH (Lo033S001; B.M.1964-250). The type is unique.

Etymology.

The name of the new species refers to the type locality; noun in apposition.

Diagnosis.

So far only one Depressacca species has been known. The new species differs from D. globosa Ingrisch, 1998 by the male tenth abdominal tergite that does not have projections but a slightly concave apex, by the male subgenital plate that does not have a medial process and that has only minute styli, by different shapes of the titillators, by the cerci that have the internal tooth inserted subapical, not apical, and by the fastigium verticis that is provided with a distinct tubercle at base.

Description.

Fastigium verticis upcurved, with a tubercle at base; apex obtuse; separated by a shallow furrow from fastigium frontis (Fig. 7B ). Eyes projecting laterad (Fig. 7A ). Frons little rugose (Fig. 7D ). Pronotum strongly rugose, depressed, wide; anterior margin truncate in middle; posterior margin little concave; transverse furrows indistinct, widely interrupted in middle; paranota at anterior margin with a spine; ventro-posterior margin sinuate, finely crenulated; auditory swelling greatly swollen but indistinctly outlined; humeral sinus weakly indicated (Fig. 7A, C ). Prosternum mute; meso- and metasternum much wider than long, without lobes. Tegmen little surpassing hind knees, nearly covering abdomen; narrowing from base to rounded apex (Fig. 7E ). Femora rugose, rather short; spines on anterior side distinctly longer than on posterior side. Fore tibia with spines on ventro-internal side much longer than on external side; spines of hind tibia on dorso-internal side more than twice as long as on the other three margins. Femora with the following number of spines on ventral margins: profemur 3 small external, 4 large internal; mesofemur 5 large external, 2 small internal; postfemur 6-7 mostly large external, no internal. Knee lobes of fore femur obtuse on both sides; of mid femur obtuse on external, acute on internal side; of hind femur spinose on both sides.

Male. Tegmen with stridulatory area strongly projecting (Fig. 7E ). Stridulatory file about 1.80 mm long along diameter, with about 210 very dense teeth, plus at end 4 spaced, wider teeth that extend the file length to 1.86 mm along diameter; in middle of file with about 111 teeth at 1 mm or 55.5 teeth per 0.5 mm (Fig. 7F ). Tenth abdominal tergite little projecting between insertion of cerci; apical margin broadly concave. Epiproct Y-shaped; lateral margins projecting as rounded lobes, except in apical area (Fig. 7G, I ). Paraprocts with a small, compressed, obtuse projection (Fig. 7I ). Cerci short, conical; at apex with a stout, subacute, internal projection; basal of projection on internal side with another, small, triangular projection (Fig. 7H ). Subgenital plate broad, with indication of a faint medial carina; apex broad obtuse-angularly excised. Styli reduced to small tubercles (Fig. 7G ). Titillators subfused in middle; basal lobes, central area and base of apical lobes hyaline; apical lobes afterwards light brown, of roughly triangular outline and with wavy surface; margin crenulate, slightly bilobate with margin of external lobe provided with three acute teeth (Fig. 7J ).

Coloration.

Discolored light yellowish brown; might have been green when alive.

Measurements of male.

Body: 17; pronotum: 5.7; tegmen: 10.2; hind femur: 7.8 mm.

Figures

Figure 7. Depressacca kinabalu sp. nov. male holotype: A habitus dorsal view; B fastigium verticis lateral; C head, pronotum and base of tegmen lateral; D face; E left tegmen; F stridulatory file; G subgenital plate and cerci in ventral view; H left cercus in dorsal view; I tip of abdomen in apical view; J titillators of phallus. Abbreviations: 10 tenth abdominal tergite, c cercus, e epiproct, p paraproct, st stylus.