Trichophallus capillatus, 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 : 37-41

Trichophallus capillatus sp. nov.

Figs. 17–18

Holotype male: Papua New Guinea: Papua New Guinea, WEI, Wau , 29 August 1981 (coll. G.K. Morris)— 1 male (Naturalis Leiden).

Other specimens studied: Papua New Guinea: Bismarck Archipelago, New Britain, Gazelle Peninsula, Taliligap, elev. 300 m (4°19‘23.89‘‘S, 152°9‘38.94‘‘E), 17–18.xii.1962, coll. J. Sedlacek — 1 female, 1 male ( BPBM Honolulu ); Gazelle Peninsula , Vunakanau , 5.v.1956, coll. J.L. Gressit — 2 males ( BPBM Honolulu ) ; same locality, 16.v.1956, coll. J.L. Gressit — 1 male ( BPBM Honolulu ) ; same locality, 3.vii.1956, coll. J.L. Gressit — 1 female ( BPBM Honolulu ) ; same locality, 19.vii.1956, coll. J.L. Gressit — 1 male ( BPBM Honolulu); Eastern Highlands, Goroka, elev. 1500 m (6°5‘S, 145°25‘E), 3.vi.1955, coll. J.L. Gressitt — 1 male ( BPBM Honolulu ) ; same locality, 4.vi.1955, coll. J.L. Gressitt — 1 female ( BPBM Honolulu ) ; same locality, 10.vi.1955, coll. J.L. Gressitt — 1 female ( BPBM Honolulu ) ; same locality, 22.v.1961, coll. J.L. & M. Gressitt — 4 females, 7 males ( BPBM Honolulu); Madang, Finisterre Mts., Naho River Valley, Budemu, elev. 1220 m (5°55‘S, 146°5‘E), 15–24.x.1964, coll. M.E. Bacchus — 1 female (paratype) ( NHM London ); Morobe, Lae , (6°45‘S, 145°0‘E), 27.v.1956, coll. E.J. Ford Jr. — 1 female ( BPBM Honolulu ); Wau , elev. 1200 m (7°20‘S, 146°45‘E), 1.ix.1961, coll. J. Sedlacek — 1 male ( BPBM Honolulu ) ; same locality, 2.ix.1961, coll. J.&. M. Sedlacek — 1 male ( BPBM Honolulu ) ; same locality, 1– 20.xi.1961, coll. J. Sedlacek — 1 male ( BPBM Honolulu ) ; same locality, 2–10.xi.1961, coll. J. & M. Sedlacek — 1 female ( BPBM Honolulu ) ; same locality, 7–16.xii.1961, coll. J. Sedlacek — 1 male ( BPBM Honolulu ) ; same locality, 8.i.1962, coll. J. Sedlacek — 1 male ( BPBM Honolulu ) ; same locality, 28.xi.1964, coll. J. Sedlacek — 1 male ( BPBM Honolulu ) ; same locality, 21.ii.1965, coll. J. & M. Sedlacek — 1 female, 1 male ( BPBM Honolulu ) ; same locality, 30.ix.1965, coll. J.L. &. M. Gressitt — 1 male ( BPBM Honolulu ) ; same locality, 25.iii.1966, coll. J.L. Gressitt — 1 male ( BPBM Honolulu ) ; same locality, 21.iv.1966, coll. J.L. &. M. Gressitt — 1 female ( BPBM Honolulu ) ; same locality, 9.v.1966, coll. J.L. &. M. Gressitt — 1 male ( BPBM Honolulu); Wau, Hospital Ck., elev. 1250 m (7°20‘S, 146°45‘E), 22.v.1965, coll. J. Sedlacek — 1 male ( BPBM Honolulu); New Guinea (NE), Chimbu Valley, elev. 1800 m (6°2‘28.06‘‘S, 144°57‘24.06‘‘E), 16.v.1963, coll. J. Sedlacek — 1 female ( BPBM Honolulu); Garaina, elev. 800 m, 16.i.1958, coll. J.L. Gressitt — 1 female ( BPBM Honolulu ) ; same locality, 11–14.vii.1969, coll. J.L. Gressitt — 1 female ( BPBM Honolulu); New Guinea NE, Morobe, Wau, elev. 1200 m (7°20‘S, 146°45‘E), 13–19.ix.1962, coll. J. Sedlacek — 1 female ( BPBM Honolulu); Western Highlands, Jimi River, elev. 1433 m (5°16‘.01‘‘S 144°14‘.01‘‘E), 6.vii.–21.ix.1961, coll. W.W. Brand [CSIRO]— 1 male ( Naturalis Leiden ) .

English name: Tiny Caramel

Etymology. The new species is named for the row of long hairs on the hyaline apical area of the titillators; from Latin capillatus long-haired.

Diagnosis. The new species differs from other species of the genus described so far by the distinctive shapes of the male cerci and the titillators on the male phallus. Females are unique for the shape of the subgenital plate provided with narrow and elongate lateral lobes reaching or surpassing the end of the basal-dorsal extensions of the ventral ovipositor valves, and the basal-lateral extensions are elongate and vaulted in preserved specimens.

Description. Small species. Tegmina varying from just surpassing hind knees to reaching middle of hind tibia, rarely surpassing middle of hind tibia. Femora with the following number of spines on ventral margins: fore femur 2–7 very minute external, 2–6 internal; mid femur 5–7 external, 1–4 internal near base; hind femur 7–12 external, 0–11 minute internal (1 or 2 near apex can be larger).

Male. Stridulatory file on underside of left tegmen 1.36 mm long, with about 88–93 teeth, with about the last 20–29 teeth becoming very small and narrow towards end of file. Tenth abdominal tergite terminating into two short triangular lobes, apex wide roundly excised in between. Epiproct with parallel lateral margins, apex truncate or slightly convex, ventral surface greatly swollen, dorsal surface with a deep pit at base. Paraprocts with internal margin greatly swollen. Cerci rather short and stout, slightly curved behind base otherwise almost straight, apex obtuse; with a conical, internal projection before middle which has a sharp tooth at tip. Subgenital plate roundly excised at apex; styli thin, little longer than excised area or of about equal length.

Titillators separate, basal area strongly sclerotised, darkened, with internal surface slightly concave, curved around mid-length and with apical margin obliquely truncate; apical area hyaline, inflated, sub-membranous, might be movable against basal area; that area at end divided into an area with granular surface on ventral-lateral side and a ballon like, simply hyaline area on dorsal-proximal side that gives rise to a cone on proximal side; internal surface of membranous area over whole length with a straight row of long bristles surpassing end of hyaline area.

Titillators of holotype separate, basal area strongly sclerotised, darkened, elongate, band-shaped with internal surface slightly concave, curved around mid-length and with apical margin obliquely truncate but somewhat irregular; apical area hyaline, inflated, sub-membranous, with granular surface, and obviously movable against basal area; at end on both sides with an oval sclerotised small sack with granular surface and stiffened rim with fine spinules; from the membranous subapical area on both sides with a row of long bristles.

Female. Tenth abdominal tergite divided in midline. Subgenital plate with a short entire basal area with concave surface, apical margin of entire area carinate with carina interrupted in midline and laterally curved into the ventral margin of moderately long, narrow and almost straight but converging apical lobes; apex of entire central area behind carina extended dorsad and with concave surface that is continued into the internal surface of the apical lobes, giving the lobes a spoon-shaped appearance in oblique ventral view; ascending lateral areas with concave surface that is interrupted by a longitudinal carina, with swollen apical and especially dorsal margins, and with a bulging lobe at anterior margin that is little covering the concave surface. Ovipositor with dorsal margin of ventral valves with an oblique, conical, setose projection, and ventral margin between apical lobes of subgenital plate swollen and also setose. Eight abdominal tergite with lateral-posterior area excised providing a triangular space between eight and ninth tergite in which the lateral area of the subgenital plate protrudes. Subgenital plate with lateral area deeply grooved, divided in middle by a carina which is fused with dorsal margin; dorsal margin swollen.

Coloration. Nearly uniformly yellowish brown with patterns 1–4 but very faint or with patterns 1 and 3 faintly indicated.

Measurements (26 males, 17 females).—body w/o wings: male 15–21 (17.9±1.3), female 14–23 (18.3±2); pronotum: male 4.2–5.0 (4.6±0.2), female 4.1–5.0 (4.6±0.3); tegmen: male 16.5–24 (20.1±2), female 17.5–27.0 (20.9±2.4); hind femur: male 10.5–13.5 (12±0.8), female 11.5–14.5 (12.5±0.9); antenna: male 50–60 (53.3±5.8), female 60; ovipositor: female 8.5–10.2 (9.2±0.5) mm.

Etymology.—The name of the new species refers to the group of hairs on top of the titillators.

Figures

FIGURE 17. Trichophallus capillatus sp. nov. male: A, stridulatory file; B–D, titillators in ventro-apical (B), distal (C), and dorsal-proximal view; E–F, habitus lateral view of holotype (E) and a paratype from Wau (F); G, last abdominal tergite, epiproct, and cerci in dorsal view; H, subgenital plate and cerci in ventral view.—In (B) both lateral sclerites had moved to the same side which is a preparation artefact, one should be left and the other right.

FIGURE 18. Trichophallus capillatus sp. nov. A, female: subgenital plate in ventral view; B, ovipositor; C–D, last tergites, subgenital plate and base of ovipositor with dorsal basal lobe of ventral valve in lateral (C) and oblique-lateral view (D); E, female subgenital plate in lateral view; F, end of male abdomen with subgenital plate and cerci in ventral view (F).