Trichophallus elongatus, 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 : 35-37

Trichophallus elongatus sp. nov.

Figs. 15–16

Holotype (male): D N. Guinea 400, Mäanderberg, 10.–20.VIII.13. Kais. Augustafl. Exp. Bürgers S.G. (Berlin ZMHB, ID B72T875).

Other specimens studied: Papua New Guinea: Neu Guinea, Kaiserin Augustafluss Expedition 387, Mäanderberg, 4° 5‘ S, 141° 39‘ E, 1–10 August 1913 (coll. Bürgers)— 1 male (Berlin ZMHB); Neu Guinea, Kaiserin Augustafluss Expedition 389, Mäanderberg, 1–9 August 1913 (coll. Bürgers)— 1 male (Berlin ZMHB); Neu Guinea, Kaiserin Augustafluss Expedition 396, Mäanderberg, 10–20 August 1913 (coll. Bürgers)— 1 male (Berlin ZMHB); Neu Guinea, Kaiserin Augustafluss Expedition 400, Mäanderberg, 10–20 August 1913 (coll. Bürgers)— 5 males (Berlin ZMHB); Neu Guinea, Kaiserin Augustafluss Expedition 402, Mäanderberg, 21–30 August 1913 (coll. Bürgers)— 1 male (Berlin ZMHB); Neu Guinea, Kaiserin Augustafluss Expedition 404, Mäanderberg, 21–30 August 1913 (coll. Bürgers)— 1 male, 1 female (Berlin ZMHB) .

Diagnosis. Males differ from those of other species by the rather long and narrow, little curved and rounded cerci that are before end divided into a short, compressed dorsal lobe with truncate tip and a narrowed ventral lobe with acute tip. The titillators are long and narrow and are in apical area embraced and replaced by membranous structures that carry long hairs along margin. The female subgenital plate, that has the apical area largely reduced to the narrow, apical projections resembles those in T. gracilis Karny and in T. punctatus sp. nov. It differs from both as well as from other species of the genus by the shape of the prolonged ovipositor that is only little dorso-ventrally widened around mid-length.

Description. Medium sized to smaller species. Tegmina surpassing middle of hind femur. Femora with the following number of spines on ventral margins: fore femur 4–9 external, 3–7 internal; mid femur 6–9 external, 2–5 internal near base; hind femur 9–13 external, 11–16 internal.

Male. Stridulatory file 1.38 mm long with about 110 teeth. Tenth abdominal tergite extended behind into two triangular lobes curved ventrad and provided with a distinct raised carina, apex widely excised in between. Epiproct widening backwards with angles little projecting and with a deep pit in middle of dorsal surface, apical margin faintly excised in middle. Cerci long and narrow, slightly curved, apex divided into two branches of which the ventral branch is narrow, conical and slightly longer than the dorsal branch which is compressed and widened.

Titillators separate, simple, apex obliquely truncate and somewhat irregular; in prolongation of apices with small membranous sacs that carry on internal surface a row of long bristles, have the ventral angle little projecting, rounded, and granular, and the dorsal angle conically projecting and stiffened at internal side by a long and very narrow, weak sclerite in prolongation of dorsal-proximal angle of titillator apex. Phallus membranes laterally of titillators forming a granular cap.

Female. Tenth abdominal tergite distinctly divided in midline. Subgenital plate with entire basal area reduced to an elevated, undulating carina, otherwise membranous; this carina at both sides prolonged into narrow, curved projections that are slightly widened at apex and embracing a circa heart-shaped space. Basal-lateral areas greatly prolonged dorsad, auriculate and separated from subgenital plate by a deep furrow. Ventral ovipositor valves with ventral margin between subgenital lobes with ovoid, setose swellings; their dorsal margins at base with medium sized, rounded projections pointing ventrad and with margin provided with long hairs. Eight abdominal tergite with lateral-posterior area largely excised to almost base but lateral margin again projecting posteriorly.

Coloration. Yellowish brown with patterns 1–4. Legs with indistinct maculation; hind femur indistinctly striated, apical area stippled.

Measurements.—body: male 18–22, female 21; pronotum: male 4.7–5.2, female 4.9; tegmen: male 28–31, female 30; hind femur: male 13.0–14.5, female 15; antenna: male 65; ovipositor: 12 mm.

Etymology. Named for the prolonged ovipositor which is only little widened around mid-length.

Figures

FIGURE 15. Trichophallus elongatus sp. nov. male holotype: A, stridulatory file; B, habitus dorsal view; C, end of abdomen with tenth tergite and cerci; D, subgenital plate and cerci in ventral view; E, titillators in dorsal view; F, titillator with attached membranous part carrying the long hairs and a small lateral sclerite; G, titillators in ventro-apical view.

FIGURE 16. Trichophallus elongatus sp. nov. female allotype: A, Habitus lateral view; B–C, Subgenital plate in ventral (B) and in lateral view (C); D, abdominal apex with ovipositor.—Abbreviations: be basal extension of subgenital plate; lo lobe of ventral ovipositor valve; sg subgenital plate; ov base of ovipositor.