Trichophallus willemsei, 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 : 62-64

Trichophallus willemsei sp. nov.

Fig. 32F–K , Fig. 33A–E

Holotype (m): HI011M008 = Papua New Guinea, Aroa Estate , W of Redscar Bay, grasses (9°1‘33.76‘‘S 146°39‘45.3‘‘E), 30.ix.1958, J.L. Gressit (Bishop Museum Honolulu, BPBM).

Other specimens studied:

Papua New Guinea: New Guinea S. E., Haveri , VII–XI.1893, (coll. Loria)— 1 female (Genoa ( MCSN)) ; Papua New Guinea, Aroa Estate , W of Redscar Bay, grasses, elev. 1 m, 29 October 1958 (coll. J.L. Gressit)— 1 female (Naturalis Leiden); New Guinea, Middle Fly River , 250–300 miles up, 1 July–31 August 1928 (coll. Perberton)— 1 female (Bishop Museum, Honolulu ( BPBM)) ; Papua New Guinea: Daradae near Javarere, Musgrove R., elev. 100 m, 3 October 1958 (coll. J.L. Gressitt)— 2 males (Bishop Museum, Honolulu ( BPBM)) ; New Guinea, Koitaki , elev. 457.2 m, 1 October–30 November 1928 (coll. Pemberton)— 2 males, 1 female (Bishop Museum, Honolulu ( BPBM)) ; New Guinea S. E., Haveri , VII–XI.1893, (coll. Loria)— 1 female (Genoa ( MCSN)) ; Nouvelle Guinée, Kubuna ,— 1 female (Paris ( MNHN)) ; Papua : Mt. Tafa, elev. 2590.8 m, 1–31 March 1934 (coll. L.E. Cheesman)— 1 female ( NHM London) ; Papua New Guinea, Aroa Estate , W of Redscar Bay, grasses, elev. 1 m, 30 September 1958 (coll. J.L. Gressit)— 2 males (Bishop Museum, Honolulu ( BPBM)) ; Papua New Guinea, Aroa Estate , W of Redscar Bay, grasses, elev. 1 m, 29 October 1958 (coll. J.L. Gressit)— 1 female (Naturalis Leiden) ; Papua New Guinea, between Ladoki [d? - pin] River and Brown River, elev. 35 m, 16 March 1956 (coll. J.L. Gressit)— 1 female (Bishop Museum, Honolulu ( BPBM)) ; Papua New Guinea, Brown River , 23 October 1960 (coll. J.L. Gressit)— 1 female (Bishop Museum, Honolulu ( BPBM)) ; Rigo District PNG, 1–31 October 1928 (coll. Pemberton)— 3 males, 1 female (Bishop Museum, Honolulu ( BPBM)) .

Diagnosis. The new species is closely related to T. solomona Will., It differs however by the shape of the male cerci that have a narrow and little curved internal process shortly behind mid-length of cercus while in T. solomona the internal process is compressed, triangular and arises from the subapical area. Females differ from the latter species by narrower lobes of the subgenital plate that do not overlap in apical area when at rest and have in basal area a wide and conspicuously grooved furrow instead of a small pit.

Description. Medium sized species. Tegmina reaching apical quarter of hind tibia. Femora with the following number of spines on ventral margins: fore femur 4–7 external, 4 internal; mid femur 6–7 external, 3 internal near base; hind femur 8–10 external, 8–12 internal. Femora with the following number of spines on ventral margins: fore femur 3–7 external, 3–5 internal; mid femur 5–7 external, 2–4 internal near base; hind femur 7–11 external, 7–15 internal.

Male. Stridulatory file with about 111 teeth, less densely arranged than in T. murua sp. nov. Tenth abdominal tergite with two long apical projections slightly curved mediad and ventrad. Epiproct small, obtuse-triangular or rounded with a pit in middle. Paraprocts with a styliform projection at internal margin. Cerci elongate, narrow, very faintly sinuate, with a large compressed internal tooth in middle of length which is roughly triangular with curved margins and setose apex. Subgenital plate long-roundly excised at apex; setose, especially dorsal-internal and medial areas of apical lobes densely covered with long setae; styli little shorter than excised area or of almost equal length. Titillators hyaline, simple, in about apical third with an angular fold, at apex with a small curved spine; apical parts supporting internal surface of membranous bags which are forming two rounded lobes: around apical area of titillators and around triangular expansion of apical parts; the latter provided with long bristles along margin.

Female. Tenth abdominal tergite furrowed and apex with a short spiniform projection at both sides of midline. Subgenital plate with entire basal area deeply furrowed and with an incomplete weak medial carina in the furrow; circa apical half of plate divided into two broad lobes touching each other in midline; external margin of lobes first concave, then convex, internal margin straight, then convex, apex obliquely subtruncate with angles broadly rounded; basal-lateral areas greatly extended dorsad and with apical margin convex. Eight abdominal tergite with lateral-posterior areas excised but very marginal area again a little projecting. Dorsal margin of ventral ovipositor valves at base with an elongate setose projection. Subgenital plate with short setae; its lateral areas strongly bent dorsad, flattened and faintly grooved; dorsal margin rounded.

Coloration. Yellowish brown with patterns 0-1-4. hind femur with dorsal and apical areas stippled; genicular areas of all legs indistinctly maculated and stippled.

Measurements (9 males, 9 females).—body w/o wings: male 20–24 (21.7±1.4), female 17–26 (21.3±2.9); pronotum: male 5.2–5.5 (5.4±.1), female 5–6 (5.4±.3); tegmen: male 30.5–33 (31.3±.9), female 30–33.5 (31.8±1.1); hind femur: male 15–16.5 (15.8±.6), female 15–18 (16.3±.9); antenna: male 50–55 (52.5±3.5), female 50–55 (52.5±3.5); ovipositor: female 10–11.5 (10.8±.5) mm.

Etymology. The name of the new species is given in honour of the late Dr. C. Willemse, who was the first person to study this insect.

Figures

FIGURE 32. A–E: Trichophallus murua sp. nov. from Murua, holotype; F–K: Trichophallus willemsei sp. nov. from Aroa Estate, holotype.—A, F, stridulatory file; B, G, supra-anal plate and cerci; C, H, subgenital plate and cerci; D–E, I–K, titillators in ventro-apical (D, I), oblique lateral (E, K), and apical view (J). I and J not to scale.

FIGURE 33. A–E, Trichophallus willemsei sp. nov. from Brown River (A), Mt. Tafa (B), Middle Fly River (C, E), Koitaki (D).—F–I, Trichophallus murua sp. nov. from Murua.—A–D, H: female subgenital plate in ventral view; E, G, Ovipositor; F, habitus female; I, subgenital plate in lateral view.—Abbreviation in I: l, basal lobe of ventral ovipositor valve.