Larnaca (Larnaca) samkos, 2018

Ingrisch, Sigfrid, 2018, New taxa and records of Gryllacrididae (Orthoptera, Stenopelmatoidea) from South East Asia and New Guinea with a key to the genera, Zootaxa 4510 (1), pp. 1-278 : 207-208

Larnaca (Larnaca) samkos sp. nov.

Figs. 71 J–K, 73D–F

Material examined. Holotype (female): Cambodia: Pursat, Phnom Samkos , (12°13'2''N, 102°55'7''E), 15– 18.x.2016, leg. J. Constant & J. Bresseel (I.G.: 33.345 GTI project)—(Brussels RBINS).

Diagnosis. The new species is characterized by the female seventh abdominal tergite that is distinctly wider than long and carries in middle a rather large triangular depression from hind margin occupying about two third of sternite length ( Fig. 73E ). The shape of that depression is similar to that of L. palliceps javae Gorochov 2003 . But as that species does not have a wide seventh sternite, instead it is of almost equal length and width, the triangular depression appears much shorter than in L. samkos sp. nov. Moreover, the subgenital plate of L. samkos , although transverse band-shaped as in most relatives in the genus, is distinctly longer than in L. phetchaburi Gorochov, 2003 from South Thailand. From the latter species L. samkos also differs in having a central incision from both sides of the subgenital plate giving it a handle-shaped appearance. It also differs by the relatively wider and shorter seventh sternite with wide medio-apical depression while in L. phetchaburi this depression is narrow with slightly diverging margins but an obtuse base. Moreover the transverse subgenital plate is distinctly shorter in L. samkos than in L. phetchaburi .

Description. Small species ( Fig. 73D ). Head: Face ovoid, surface nearly smooth but in middle rather matt, with very fine transverse riffles and scattered impressed dots; fastigium verticis much wider than scapus, separated by an indistinct transverse suture from fastigium frontis; ocelli distinct; subocular furrow in dorsal area weak and narrow, in ventral area wide and distinct ( Fig. 71J ). Third abdominal tergite with 3 remnant stridulatory pegs.

Wings hardly overlapping each other in middle; leaving tip of abdomen free ( Fig. 71K ). Tegmen: apart from the two subcostal veins, with 7 full length veins in nearly equal distance from each other, only the second of these veins forks once behind middle of tegmen. Legs: Fore coxa with a spine at fore margin; fore and mid femora unarmed; fore and mid tibiae with four pairs of large ventral spines and one pair of smaller ventral spurs; hind femur with 8–11 external and 9–11 internal spines on ventral margins; hind tibia with spaced spines on both dorsal margins; ventral margins with one pre-apical spine each; with 3 apical spurs on both sides.

Coloration. General color brown; head mostly black but vertex brown, pronotum fully black; fore and mid femora and tarsi black but leaving basal and apical areas and internal side of mid femur brown; genicular area of hind femur and all of hind tibiae black. Face fully black, only fastigium verticis and base of antennae dark reddish brown; ocelli of lighter color; compound eyes yellow; ventral area of clypeus dirty yellow; maxillary palpi black but tips of joints yellow or at last segment reddish; labial palpi yellow. Tegmen dark orange brown, near tip white; main veins black near base, otherwise as veinlets brown; hind wing semi-transparent, colorless; main veins dark brown, veinlets brown.

Male unknown.

Female. Seventh abdominal sternite wider than preceding sternites; with a large, about triangular groove in middle starting with angular base in subbasal area and ending with convex margin in basal area of subgenital plate. Subgenital plate short, band-shaped, in middle constricted from anterior and posterior side ( Fig. 73E ). Ventral valves of ovipositor at very base with a rounded ventral projection, in between covered by a short membranous triangular flap with convex lateral margins and acutely produced tip ( Fig. 73F ). Ovipositor falcate, most strongly upcurved in subbasal area, margins gradually approaching towards apex; tip broken.

Measurements (1 female).—body w/wings: 20.5; body w/o wings: 20.5; pronotum: 4.5; tegmen: 12; tegmen width: 5; hind femur: 10.5; antenna: 85; ovipositor: 7.5 mm.

Etymology. The new species is named after the type locality; noun in apposition.

Figures

FIGURE 71. Genus Larnaca: A–C, L. nigricornis sp. nov. male holotype (A–B) and paratype (C); D–G, L. eugenii (Griffini, 1914) male holotype (D–E) and male from Tay Yen Tu (F–G); H–I, L. tenuis sp. nov. female holotype; J–K, L. samkos sp. nov. female holotype; L–N, L. subaptera sp. nov. male holotype; O–P, L. squamiptera sp. nov. female holotype; Q, L. larnacoides (Karny, 1937) female in Karny collection (not a type).—Habitus dorsal view (A, D, F, H, K, L, O), do. lateral view (M, Q), face (B–C, E, G, I–J, N, P).—Scales 10 mm (habitus), 5 mm (face), not all images to scale.

FIGURE 73. Genus Larnaca: A–C, L. tenuis sp. nov. holotype; D–F, L. samkos sp. nov. holotype; G–I, L. squamiptera sp. nov. holotype.—Female habitus lateral view (A, D, G); ovipositor (B); female sixth to seventh abdominal sternite, subgenital plate and base of ovipositor in ventral view (C, E, H), female end of abdomen in apical view on base of ovipositor and subgenital plate (F), end of abdomen in lateral view (I).