Paramacroxiphus irregularius, Ingrisch, 2008

Ingrisch, Sigfrid, 2008, Revision of the genera Paramacroxiphus C. Willemse 1961 and Pseudomacroxiphus C. Willemse 1961 (Orthoptera: Tettigoniidae: Conocephalinae: Agraeciini), Zootaxa 1755 (1), pp. 1-34 : 16-18

Paramacroxiphus irregularius sp. n.

Figs. 15 , 33–34 , 36 , 47 , 56 , 95

Holotype (male): Indonesia: Papua, Neth. Ind.-Amer. New Guinea Exped., Rattan Camp , 1200m, 4.II.1939, L.J. Toxopeus, labelled: " Pseudonicsara ? irregularia sp. n. " . Holotype in Museum Zoologicum Bogoriense [Cibinong], Indonesia .

Description. Fastigium verticis: eye length = 1.6: 2.1 mm; projecting 0.9 mm in front of eyes. Femora with the following number of spines on ventral margins: profemur 8 external, 6 internal; mesofemur 6–7 external, 3 internal; postfemur 14 external, 15 internal.

Male. Stridulatory file slightly sinuate, circa 3.28 mm long; teeth large near base, small and dense near apex ( Fig. 15 ); with about 110 teeth or 33.5 teeth per mm; in middle with 26.0 teeth per mm; in basal half with 24.5 teeth per mm. Tenth abdominal tergite prolonged behind with lateral margins converging apically; apex bilobate ( Fig. 33 ). Epiproct hidden under tenth tergite, rounded-triangular, depressed in middle of dorsal surface. Cerci short-conical; with a curved, acute, baso-internal tooth in situ hidden under tenth tergite; with a medio-longitudinal carina on internal surface, and with a large, slightly compressed, apico-internal tooth with subacute apex and carrying 1–3 spinules on internal margin ( Fig. 34 ). Subgenital plate wit central area largely projecting behind and surpassing apices of cerci and tenth tergite; projection narrow, slightly widening towards and fissing at apex; styli small ( Fig. 36 ).

Titillators rather weakly sclerotised, basal parts hyaline and fused; apical parts connected with robust sheaths; sheaths forming circa rectangular compressed sacculi with rather irregular margins; lateral and apical rims coarsely crenulated ( Figs. 47 , 56 ). Membranes on dorso-proximal side provided with a small, transverse, crenulated area on each side in circa half the length of the sheaths.

Female unknown.

Coloration. Dark brown, marbled with less darkened areas and with pale dots on pronotum and femora. Frons brown; mouthparts ventrally of area around clypeo-frontal suture black, but ventral margin of dorsal part of labrum yellow; antennal scrobae, scapus and pedicellus black. Pronotum brown, darker towards anterior and ventral margins; with three dark spots on disc and three dark spots each on paranota, all little distinct. Tegmen dark brown with pale veins and veinlets especially at base and in anterior area; apical area unicolorous; dorsal area pale. Cerci dark brown with pale warts and teeth. Subgenital plate dark brown.

Measurements of male: body 36; pronotum 11.7; tegmen 40; postfemur 26 mm.

Diagnosis. P. irregularius is another species with the central part of the male subgenital plate strongly projecting. The projection is narrower than in the other three species and a little constricted in middle. The new species is unique for the tenth abdominal tergite, which appears rather flat except in the baso-lateral areas, triangularly prolonged but with the apex excised. Also the cerci are specific in having a minute basal tooth and a single but very long apico-internal tooth. The titillators are characteristic for the short but very wide lateral branches of the apical parts and the sinuate apex of the main branches.

Etymology. The new species is named for the irregular margins of the titillators.

Figures

FIGURES 11–15. Stridulatory files on underside of left tegmen of Paramacroxiphus males: 11, P.armatus holotype; 12, P. bifasciatus holotype; 13, P. brunneus holotype; 14, P. elongatus holotype; 15, P. irregularius holotype.

FIGURES 29–34. Male abdominal apex of Paramacroxiphus species in dorsal view (31, in dorso-lateral view; 34, left cercus): 29, P. brunneus holotype; 30, P.armatus holotype; 31, P. elongatus holotype; 32, P. bifasciatus holotype; 33–34, P. irregularius holotype. The arrow points at the baso-internal tooth of the cercus. 10t tenth abdominal tergite; ce cercus; pa process of paraproct; sg subgenital plate.

FIGURES 35–44. Male subgenital plate (35–43) and stridulatory area of right tegmen (44) of Paramacroxiphus species: 35, P. elongatus holotype; 36, P. irregularius holotype; 37, P.rufus holotype; 38, P. securiformis holotype; 39, P.armatus holotype; 40, P. bifasciatus holotype; 41, P. maculatus holotype; 42, P. aberrans holotype; 43, P. brunneus holotype; 44, P.aberransparatype. Abbreviations: m mirror, s scrapper, sp field of spinules.

FIGURES 45–49. Male titillators of Paramacroxiphus species in ventro-distal view: 45, P. brunneus holotype; 46, P. bifasciatus holotype; 47, P. irregularius holotype; 48, P. elongatus holotype; 49, P.armatus holotype (surface structure indicated at apex). Baso-lateral sclerite only shown on one side. Abbreviations: ap apical part of titillator; bp basal part of titillator; br bristles; bs baso-lateral sclerite; m membranous part of phallus.

FIGURES 50–56. Male titillators of Paramacroxiphus species in lateral view (50, 53), dorso-proximal view (51–52, 55– 56) and detail of apical part (54): 50–51, P.armatus holotype; 52, P. bifasciatus holotype; 53–54, P. brunneus holotype; 55, P. elongatus holotype; 56, P. irregularius holotype. Abbreviations: ap apical part of titillator; bp basal part of titillator; br bristles; bs baso-lateral sclerite; m membranous part of phallus. Scale bars = 1 mm.(ZMB); 1 female, do. 67, Pionierlager, 1.v.–30.vi.1912, Bürgers (ZMB); 1 female, do. [label unreadable], Bürgers (ZMB).