Trichophallus lobatus, Ingrisch, 2024

Ingrisch, Sigfrid, 2024, Revision of the genus Trichophallus Ingrisch, 1998 with notes on the genera Secsiva Walker, 1869 and Subrioides C. Willemse, 1966 (Orthoptera: Tettigoniidae: Conocephalinae: Agraeciini), Zootaxa 5442 (1), pp. 1-66 : 23-26

Trichophallus lobatus sp. nov.

Figs. 8–9

Holotype (male): Papua New Guinea: Neu Guinea, Kaiserin Augustafluss Expedition 317, Standlager am Töpferfluss (4°27‘S, 144°13‘E), 22 April 1913, coll. Bürgers ( ZMHB Berlin).

Other specimens studied: North New Guinea, Mamberamo, Albatros Bivak (2°17‘S, 138°1‘E), 1–31.v.1926, coll. W. Docters v. Leeuwen, North New Guinea Expedition — 1 male (paratype) ( Bogor , MBBJ); Indonesia: Papua, Hollandia [= Jayapura], (2°29‘S, 140°41‘E), 1–31.vii.1938, coll. L.J. Toxopeus — 1 male (paratype) ( MBBJ Bogor ); Hollandia [= Jayapura]— Binnen , elev. 100 m (2°32‘S, 140°40‘E), 2.xi.1958, coll. J.L. Gressitt — 1 female ( BPBM Honolulu); 40 km W. of Hollandia [Jayapura], Genjam [Genyem, Gengen], elev. 100–200 m (2°46‘S, 140°12‘E), 1–10.iii.1960, coll. T.C. Maa — 1 male ( BPBM Honolulu); Cyclop Mountains , Behind Kotanika, near Lake Sentani , elev. 80 m (1°36‘S, 140°39‘E), 17.x.1957, coll. J.L. Gressitt — 1 male ( BPBM Honolulu); Ifar, elev. 350 m (2°34‘S, 140°31‘E), 9.vi.1962, coll. J. Sedlacek — 1 male ( BPBM Honolulu); Jayapura Area , Waris S. of Hollandia [= Jayapura], elev. 450–500 m (3°30‘S, 140°55‘E), 1–7.viii.1959, coll. T.C. Maa — 1 female ( BPBM Honolulu); same locality, 16–23.viii.1959, coll. T.C. Maa — 1 female, 2 males ( BPBM Honolulu); Mamberamo Area , River Tor (mouth) 4 km E. of Hol Maffen, (1°59‘S, 138°58‘E), 4.vii.1959, coll. T.C. Maa — 1 male ( BPBM Honolulu); Meerolakte, Motorbivak, (3°5‘S, 137°28‘E), 1–31.viii.1926, coll. W. Docters v. Leeuwen, North New Guinea Expedition— 1 female (paratype) ( MBBJ Bogor ); Swart Valley , Karubaka , elev. 1400 m (3°35‘S, 138°30‘E), 6.xi.1958, coll. J.L. Gressitt — 1 female, 1 male ( BPBM Honolulu ); same locality, 12.xi.1958, coll. J.L. Gressitt — 2 females ( BPBM Honolulu ); Papua New Guinea: West Sepik, Toricelli Mountains , Samoro [Mt. Somoro], elev. 900–1100 m (3°23‘48.08‘‘S, 142°8‘12.71‘‘E), 1.ii.–31.v.1975, coll. J.L. Gressitt — 1 male ( BPBM Honolulu) .

Diagnosis. T. lobatus is characterised by the rather short and little curved cerci that have the apical area down-curved and somewhat compressed, with rounded end that carries a small spinule or spine. The titillators are fully sclerotised with deviating bases and curved apical area; they carry in subapical area long and narrow lateral extensions that have the apical areas re-curved thus forming a loop. Females can be recognised by the short lobes of the subgenital plate that hardly surpass their proximal-dorsal expansions and leave the basal projections of the dorsal margin of the ventral ovipositor valves completely uncovered.

Description. Medium sized species. Fastigium verticis laterally compressed, dorsal surface very faintly furrowed, apex rounded, obtuse. Frons shining with hardly any impressed dots. Pronotum semi-cylindrical, apical area of disc nearly flat and shouldered; transverse sulcus weak, interrupted in midline; anterior margin broadly rounded but slightly concave in middle; posterior margin faintly rounded, almost subtruncate; ventral margin descending backwards, rounded below apical callus and afterwards ascending; humeral sinus faintly indicated. Tegmen long and narrow, surpassing middle of stretched hind tibia. Prosternum with 2 small obtuse tubercles. Meso- and metasternal lobes rounded; medial plate with an obtuse conus at each posterior angle. Mesocoxa with ventral internal projection rather long (less so on postcoxa), dorsal-anterior margin with a triangular projection. Femora with the following number of spines on ventral margins: fore femur 4–8 external, 4–6 internal; mid femur 2–9 external, 0–4 internal; hind femur 8–11 external, 4–13 internal (the internal spines smaller than the external). Knee lobes of fore femur obtuse on external, acute-triangular on internal side; of mid femur obtuse on both sides; of hind femur bi-spinose on both sides. Hind tibia with 1 dorsal and 2 ventral apical spurs on each side.

Male. Stridulatory file varying between 95 and 130 teeth in all specimens studied; toward end teeth becoming small and very dense; in holotype with 105 teeth at 1.1 mm total file length or with 91 teeth at 1 mm in the area with the largest teeth. Tenth tergite vaulted and slightly prolonged; apex widely excised between two broad, rounded-triangular lateral lobes. Epiproct rounded-triangular; disc depressed in middle. Paraprocts with internal margin carinate and setose. Cerci cylindrical but somewhat depressed; in circa apical two thirds with a strong dorsal-internal carina; internal surface below carina concave and prolonged into a broad-triangular, ventral-internal process, which is depressed, curved ventrad before apex, and terminates into an acute spine. Cerci short, slightly curved, dorsal-internal margin with a low, rounded, lamellar expansion except at base; with a stout, conical, apical-internal projection that is curved ventrad before apex and terminates into an acute tooth. Subgenital plate with lateral areas sloping and margin carinated; disc with a broad, rounded lateral carina before base of stylus on each side; apex roundly excised between bases of styli.

Titillators separate, rather large and stout, roughly T-shaped with the ventral apical branch of the T however much longer than the dorsal-proximal branch; margin of the larger branch with a short row of medium long bristles; in prolongation of the apex of the large branch inserts an additional elongate sclerite that stands at first vertical to its source, but after a short distance curved and running parallel to the long branch, thus including a hyaline tube between both sclerites, bulging behind the bristles. Lateral and dorsal-proximal of titillators, phallus membranes forming large, distinctly granular, weakly sclerotised plates with irregular margins of which the apical margin is produced into a triangularly rounded cap.

Female. Eighth tergite with ventral-lateral, apical angles reduced leaving a triangular space between eight and ninth tergites. Tenth tergite furrowed in midline; apex truncate on both sides, triangularly incised in middle. Cerci long-conical, slightly curved, apex pointing. Subgenital plate with ventral area reduced to two short lobes separated from each other and from lateral areas by deep furrows, at end down-curved with obtuse tips; lateral areas large, extended dorsad, disc-shaped with ventral and apical margins swollen, surface grooved and partly covered by a membranous lobe. Ovipositor falcate, with margins converging from behind middle of length; margins smooth; ventral margin of ventral valves just behind subgenital plate with a tuft of long hairs but otherwise unmodified; dorsal margin of ventral valves at base with a setose, semi-ovoid expansion which is pointing ventrad and surpassing the ventral margin of ovipositor; margin of process provided with long hairs. Ovipositor with ventral margin of ventral valves just behind subgenital plate with a tuft of long hairs but otherwise unmodified; dorsal margin of ventral valves at base with a setose, semi-ovoid expansion. Eight tergite with ventral-lateral, apical angles reduced leaving a triangular space between eight and ninth tergites. In the female from Motorbivak the lateral lobes of the subgenital plate are much stronger curved and the margins of the ovipositor converging only in circa apical two thirds.

Coloration. Uniformly yellowish-brown. Tegmen with a few indistinct dark spots.

Measurements (all).—body w/o wings: male 17–22, female 17–21; pronotum: male 4.8–5.7, female 4.3–5.0; tegmen: male 23.5–30.0, female 25–28; hind femur: male 13.5–15.0, female 13–15; antenna: male 55, female 50; ovipositor: female 9–10 mm.

Figures

FIGURE 8. Trichophallus lobatus spec. nov. male: A, face; B, habitus lateral view; C, stridulatory file; D, end of abdomen in dorsal view; E, end of abdomen in ventral view; F, cerci in lateral view; G–I, titillators in different views.—A–B, D–F, from Töpferfluss; C, G–I, from Genjam.

FIGURE 9. Trichophallus lobatus spec. nov. female: A, habitus (Pionierbivak); B–E, abdominal apex with subgenital plate and base of ovipositor with lateral appendage of ventral valve in lateral (B, C) and ventral view (D, E), ovipositor (F).—B–C, F, female from Mulic River; E, from Kurubaka.