Paramacroxiphus armatus, 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 : 10-11

Paramacroxiphus armatus sp. n.

Figs. 11 , 30 , 39 , 49–51 , 78 , 95

Holotype (male): Indonesia: Papua, North New Guinea Exp., Mamberamo , Alb.-Bivak, v.1920, W. Docters v. Leeuwen, labelled: " Habetia ? armata sp. n. " . Holotype in Museum Zoologicum Bogoriense [Cibinong], Indonesia .

Specimens Examined (Paratypes): 1 male, 2 females, same data as holotype (MBBJ).

Description. Fastigium verticis: eye length = 1.2: 1.9 mm; projecting 0.6 mm in front of eyes. Tegmen reaching almost middle of stretched posttibia; anterior margin convex in circa anterior half, subparallel to posterior margin in apical half. Prosternal spines short, subacute. Mesosternal lobes short-conical to acute-triangular. Femora with the following number of spines on ventral margins: profemur 7–8 external, 6–9 internal; mesofemur 7 external, 3–4 internal; postfemur 14 external, 14–18 internal.

Male. Stridulatory file circa 2.26 mm long; sinuate; teeth large near base, small and very dense near apex ( Fig. 11 ); with about 120 teeth or 53.1 teeth per mm; in middle with 57.7 teeth per mm; in basal half with 26.0 teeth per mm. Tenth abdominal tergite not prolonged; apex roundly emarginated in middle ( Fig. 30 ). Epiproct rounded-triangular. Cerci subconical, somewhat curved and slightly depressed; apex with 2 internal projections: dorsal projection rather stout at base, conical, curved and narrowing into an apical acute tooth; ventral projection long, depressed and conical at base, finger-shaped in circa apical half, apex subobtuse ( Fig. 30 ). Subgenital plate narrowing towards apex; disc somewhat curved, with one rounded medial and two rounded lateral carinae; lateral areas sloping and carinated; apex roundly excised; styli slightly depressed ( Fig. 39 ).

Titillators with apex terminating in 2 crenulated, dark, somewhat depressed, and sharp-edged lobes of unequal size; below the fusing area, the sclerite becomes rather thin and plate shaped (i.e. restricted to the internal surface while the external surface of the apical sacculi is a thin hyaline membrane), in circa middle of titillator length this plate becomes suddenly thickened; before base the titillators are suddenly curved laterad, basal apex rather irregular ( Fig. 49–51 ). Titillators connected on both, dorso-proximal and ventro-distal side with a membranous sheath: dorso-proximal sheath long-sacculiform with surface in apical area covered by very fine hair which are arranged in rows, giving it a finely striped appearance; sheaths of both titillators fused somewhat apical of titillator middle; ventro-distal sheath forms a very elongate, somewhat compressed sacculus fused at external base with surrounding membranes; except for hyaline apex very densely covered by long, parallel hairs and by few strong projecting bristles; bristles with arrow-shaped apex (i.e. very faintly thickened before apex and than narrowing into a very fine point). Baso-lateral sclerites elongate, somewhat irregular, three-carinate.

Female. Tenth abdominal tergite furrowed in midline; apex subtruncate. Cerci long-conical, slightly curved, apex pointing. Subgenital plate transverse with apically narrowing lateral margins; baso-lateral corners slightly grooved on a more strongly sclerotised surface; behind this area slightly depressed; apical margin truncate and with a spinose process at each side ( Fig. 78 ). Ovipositor rather narrow near base, thereafter with dorsal margin convex, highest in circa middle of length; ventral margin faintly concave.

Coloration. Yellowish-brown. Mandibles and apices of spines darkened. Tegmen with little distinct dark spots consisting of small accumulations of dark dots.

Measurements: body male 31, female 30–32; pronotum male 8.8–9.0, female 9.0; tegmen male 31, female 37–38; postfemur male 19–20.5, female 21–22; ovipositor 36–37 mm.

Diagnosis. The new species differs from congeners by the male tenth abdominal tergite, which is neither globose nor prolonged but at apex with a wide and shallow concave excision. The male subgenital plate is the least modified within the genus in that it is only little prolonged and not divided into narrow branches. The cylindrical male cerci without basal tooth but two narrow acute apico-internal projections are also species specific. The titillators are unique within the genus in that they are provided with long bristles inserted in the centro-medial area. The female subgenital plate has the apex provided with two spaced narrow projections. With regard to this character it resembles P. rufus and P. securiformis . It differs from both species by these apical projections running straight and parallel, not upcurved or approaching each other, and by the shape of the basal area of the subgenital plate.

Etymology. Named for the titillators, which are armed with long bristles.

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).

FIGURES 67–79. Female subgenital plate of Paramacroxiphus species in ventral view (67, 69, 70, 72, 74, 76, 78), lateral view (68, 71, 73, 75, 77) or recurved (79): 67–68, P. aberrans allotype (67) and paratype (68); 69, P. tessellatus holotype [the white arrow points at the apical cones]; 70–71, P. maculatus allotype; 72–73, P. uniformis holotype; 74–75, P. securiformis allotype; 76–77, P.rufus allotype (76) and paratype (77); 78, P.armatus paratype; 79, P. brunneus allotype. Abbreviations: ac apical cone; m membranous area; po pits at very base of ovipositor; ps pits at lateral area of subgenital plate; sd inner [= dorsal] surface of recurved subgenital plate; vv base of ventral valves of ovipositor usually hidden under subgenital plate.