Philmontoides striatus, Ingrisch, 2022

Ingrisch, Sigfrid, 2022, Revision of the genus Philmontis Willemse, 1966 and description of a new genus Philmontoides gen. nov. from New Guinea (Orthoptera: Tettigoniidae; Conocephalinae), Zootaxa 5182 (2), pp. 101-151 : 145-146

Philmontoides striatus sp. nov.

Figs. 9I , 10B , 11G–H , 12F , 15F–H , 16C , 17I–J

Holotype (male): Papua New Guinea: East Sepik, Etappenberg , (4°37’S, 142°7’E), 8–10.xi.1912, leg. Bürgers (KAE 203)—depository: Museum für Naturkunde (formerly Zoologisches Museum), Berlin ( ZMB).

Other specimens studied (paratypes): Papua New Guinea: East Sepik, Etappenberg , same data as holotype— 1 male ( ZMB) ; Etappenberg , 10–12.xi.1912, leg. Bürgers (KAE 204)— 1 female ( ZMB) ; Lordberg , (4°38‘S, 142°37‘E), 2–4.xii.1912, leg. Bürgers (KAE 219)— 1 female ( ZMB) ; Lordberg , 9.xii.1912, leg. Bürgers (KAE 225)— 1 female ( ZMB) .

Diagnosis. The male differs from other species of the genus by the simple, short and obtuse apical lobes of the tenth abdominal tergite and by the male cerci that have the dorsal projection arising from base of cercus and are markedly prolonged and upcurved instead of downcurved in the other species. Furthermore, the apical projection of the cercus is prolonged, and curved instead of small or of moderate size. The species can also be characterized by the delicate, membranous apical area of the male titillators that are bent in a 90° angle against the long and narrow basal stems. The female is so far unique in the genus for the shape of the subgenital plate that is provided with a pair of obliquely transverse furrows in basal half, which are provided with a rippled bottom.

Description. Elongate species with tegmen reaching about end of hind femur ( Fig. 9I ). Pronotum elongate; disc with anterior and posterior margins convex, the latter covering only very base of stridulatory area of tegmen, transverse furrows interrupted in middle; lateral lobes rather narrow, ventral margin slightly concave, at end forming a rounded angle with lateral hind margin projecting laterad and clearly visible from above. Prosternal spines long; medial plate with a tubercle at both posterior angles; mesosternal lobes obtuse; metasternal lobes rounded with an angle or fold. Femora with the following number of spines on ventral margins: (1) 5-7 / 7-9; (2) 5-7 / 2-5; (3) 10- 14 / 8-15 (n = 5); hind knee lobes bispinose; in a single female also fore femur at anterior knee lobes of both legs bi-spinose, but second spine minute.

Male. Stridulatory file ( Fig. 12F ) in about basal two thirds with moderately large and little spaced teeth, after a faint sinuosity, teeth gradually narrowing and becoming denser and at end indistinct; stridulatory file total length 1.45 mm, teeth at end uncountable; area with countable teeth 1.36 mm with 49 teeth; area with large teeth 1.06 + 0.09 mm with 33 teeth plus 3 medium large teeth at base (n = 1). Tenth abdominal tergite vaulted, hind margin diverging in about apical third into two rather wide, obtuse lobes, that area strongly setose ( Fig. 11G–H ). Cerci cylindrical near base, afterward with convex external and strongly concave internal surface, from sub-basal area with a long, narrow, and around mid-length compressed projection that is up-curved in about mid-length, cylindrical in apical area and provided with a spine at tip ( Fig. 10B ); the wide, in-curved end of cercus forms a compressed and flattened lobe that is slightly bent in about mid-length, has the apical margin truncate and the distal margin stiffened and terminating into a small, projecting spine ( Fig. 11G ). Subgenital plate rather short and wide, with a fine medial carina and widened, laterally expanded lateral extensions; apical margin roundly excised, on both sides of excision the lateral rim is curved around the bases of the styli, lateral extensions in about basal half ascending upward, in apical half roundly expanded sideward ( Fig. 11H ). Titillators in roughly basal two thirds compressed, simple bandshaped and basal third out-curved, in basal area uncolored, toward central area brownish, apical areas triangularly widened, flipped nearly rectangularly dorso-proximad, surface whitish transparent with scattered brown spots; around angle between central and apical areas with tufts of straight long hairs that are pointing straight away from the surface in the area before and at angle and laterad in the area behind angle; at lateral angles of apical areas with a small, compressed semicircular expansion with granular surface and margin ( Figs 15F–H ).

Female. Subgenital plate in ventral view with converging lateral margins and deep, triangularly excised apical margin that divides the apical area into a pair of triangular, laterally sloping lobes; along mid-line from base to middle of apical excision with a stout, compressed and elevated carina, dividing central area of plate into two deep groves which in anterior half form oblique furrows with narrow parallel riblets, while the triangular posterior area is smooth and at end bordered by transverse obtuse keels; at proximal end of groove the medial keel widens toward both sides and merges into the vaulted anterior margin of the plate; anterior lateral angles of subgenital plate swollen on both sides, otherwise simple with ascending and converging lateral margins ( Figs 17I–J ).

Coloration. Face of general color, antennal scrobae and internal surface of scapus black; vertex, occiput and upper area of genae black or dark brown; dorsal surface of pronotum of general color, lateral lobes black or dark brown with one or two light spots, margins black but partly of light color; tegmina along anterior and posterior margins of light color, partly with dark spots, in central area dark brown with light veinlets, radius and cubitus brown, media thickened and black; hind femur with black pre-genicular ring.

Measurements (2 males, 3 females).—Body w/o wings: male 27–32, female 28–29; pronotum: male 7.8–8.2, female 7.8–8.2; tegmen: male 26, female 27.5–29.0; hind femur: male 24, female 24–26; antenna: male 110, female 130–145; ovipositor: female 13.5–14.0 mm.

Etymology. The new species is named for the fluted bottom in the transverse grooves of the female subgenital plate; from Latin striatus — fluted.

Figures

FIGURE 9. Male habitus in dorsal view with left wings spread.—A, Philmontoides hageni (Dohrn, 1905) [Wanuma]; B, P. affinis (Willemse, 1966) [Baiyer Range]; C, P. wau sp. nov. [Vagau]; D, P. disjunctus sp. nov. [Tapini]; E, P. lobatus (Naskrecki & Rentz, 2010) [Hijob, Star Range]; F, P. commodus sp. nov. [Purosa]; G–H, globosus sp. nov. [Nabire]; I, P. striatus sp. nov. [East Sepik].—Scale bars 10 mm.

FIGURE 10. A–D, male abdominal apex with cerci in apical view; E, H–I, M, male cercus in dorsal view; F, J, cercus in lateral view; G, cercus in ventral view; K–L, cercus in oblique dorsal view.—A, Philmontoides affinis (Willemse, 1966) [Baiyer Range]; B, P. striatus sp. nov. [Etappenberg]; C, M, P. commodus sp. nov. [C, Okapa; M, Kassem Pass]; D, P. wau sp. nov. [Wau]; E–F, P. globosus sp. nov. [Nabire]; G–H, P. disjunctus sp. nov. [Tabini]; I–J, P. lobatus (Naskrecki & Rentz, 2010) [Star Range]; K–L, P. hageni (Dohrn, 1905) [K Dohrn collection; L Adelberg Mts].—Scale bars 1 mm. The arrow in F points at the apical spine which runs parallel to the rim of the lobe.

FIGURE 11. A–E, Male abdominal apex with tenth abdominal tergite and cerci in dorso-apical view; F–G, I, in dorsal view; H, in apical view; in some images also end of subgenital plate visible.—A, Philmontoides hageni (Dohrn, 1905) [Star Range]; B, P. lobatus (Naskrecki & Rentz, 2010) [Hijob]; C, P. globosus sp. nov. [Nabire]; D, P. disjunctus sp. nov. [Tabini]; E, P. commodus sp. nov. [Okapa]; F, P. affinis (Willemse, 1966) [Baiyer Range]; G–H, P. striatus sp. nov. [Etappenberg]; I, P. wau sp. nov. [Wau].—Scale bars 1 mm.

FIGURE 12. Stridulatory file on underside of male left tegmen.—A, Philmontoides hageni (Dohrn, 1905) [Finschhafen]; B, P. lobatus (Naskrecki & Rentz, 2010) [Star Range]; C, P. globosus sp. nov. [Nabire]; D, P. disjunctus sp. nov. [Tapini]; E, P. affinis (Willemse, 1966) [Baiyer Range]; F, P. striatus sp. nov. [Etappenberg]; G, P. commodus sp. nov. [Okapa]; H, P. wau sp. nov. [Wau]—Scale bars 1 mm.

FIGURE 15. Male titillators in ventro-apical view (A, C, E, F, I–J); do. in oblique ventro-apical view (B, D, G); do. view on apical expansion (H, K).—A–C, Philmontoides affinis (Willemse, 1962) [A–B, Baiyer Range, C, holotype]; D–E, P. commodus sp. nov. [Aiyurop]; F–H, P. striatus sp. nov. [Etappenberg]; I–K, P. wau sp. nov. [I, Vagau, J–K, Wau].—Scale bars 1 mm.

FIGURE 16. Female habitus in lateral view (A–G, I); female subgenital plate in lateral (H–J), ventral (K), and oblique lateral view (L).—A, Philmontoides geminus sp. nov. [Feramin]; B, P. affinis (Willemse, 1966); C, P. striatus sp. nov. [Lordberg]; D, P. commodus sp. nov. [Okapa]; E, P. hageni (Dohrn, 1905) [Wanuma]; F, holotype of Salomona vittata Kuthy, 1910, inset shows subgenital plate of same specimen; G–H, P. wau sp. nov. [McAdam Peak]; I–L, P. globosus sp. nov. [Nabire].—Abbreviation: b basal extension of subgenital plate.—Scale bars 10 mm (A–H), 1 mm (H–L and inset in G).

FIGURE 17. Female subgenital plate in ventral (A, C, E, G, K, I, O, M, P), lateral (B, D, F, H, J, L), and oblique apico-ventral (N) view.—A–B, Philmontoides hageni (Dohrn, 1905); C–F, P. lobatus (Naskrecki & Rentz, 2010) [C–D, Star Range 25 m from fully hardened specimen; E–F, Star Range 1500 m from freshly molded, soft specimen]; G–H, P. geminus sp. nov. [Feramin]; I–J, P. striatus sp. nov. [Etappenberg: I, well preserved; J, shrunken]; K–L, P. affinis (Willemse, 1966); M–N, P. commodus sp. nov. [M Mendi, N Mt Karimui]; O–P, P. wau sp. nov. [O, shrunken; P, well preserved].—Scale bars 1 mm. Abbreviations: b basal extension, c cover plate, m squeezed intersegmental membrane, p main plate.