Paramacroxiphus rufus, 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 : 19-22

Paramacroxiphus rufus sp. n.

Figs. 8 , 19–21 , 37 , 65–66 , 76–77 , 95

Holotype (male): Papua New Guinea: Kaiserin Augustafluss Expedition 241, Hauptlager bei Malu, 15.i.1913, Bürgers ( ZMB) . Holotype in Museum für Naturkunde Berlin, Germany .

Specimens examined (Paratypes): Papua New Guinea: 1 female, Kaiserin Augustafluss Expedition 107, Hauptlager bei Malu, 3.viii.1912, Bürgers ( ZMB) ; 1 female, do. 170, Strandlager am Aprilfluss , 5.x.1912, Bürgers ( ZMB) ; 1 female, do. 193, Strandlager am Aprilfluss , 22.x.1912, Bürgers ( ZMB) ; 1 male, do. 267, Lager am Rosensee , 16.ii.1913, Bürgers ( ZMB) ; 1 female, do. 320, Lager am Töpferfluss , 24.iv.1913, Bürgers

Description. Fastigium verticis: eye diameter 1.5: 2.0 mm; projecting 1.0 mm in front of eyes. Tegmen rather suddenly narrowed in basal half, narrowest in middle and faintly widened again towards apex (tegmen width near base male 8.8, female 9.0–9.5; in middle male 7.0, female 7.5–8.0; near apex male 7.5, female 8.0– 8.5 mm). Femora with the following number of spines on ventral margins: profemur 7–9 external, 5–8 internal; mesofemur 6–7 external, 3–4 internal; postfemur 13–16 external, 13–17 internal.

Male. Stridulatory file 3.17 mm long, curved in about middle, with large teeth in basal, narrow teeth in apical half ( Fig. 8 ); with about 117–127 teeth or 37–40 teeth per mm; in middle 34.9–37.7 teeth per mm; in basal half 20.4–21.5 teeth per mm. Mirror nearly quadrate, margins curved, apical margin convex; 1.74 mm long, 1.74–1.80 mm wide. Tenth abdominal tergite globular; apical margin with two shoehorn-shaped projections, deeply excised in between; middle and apex setose ( Fig. 21 ). Epiproct roughly circular, almost flat except for a nose-shaped projection in middle of apical half. Projection of paraprocts compressed conical. Cerci conical, slightly curved, reaching about apex of projections of 10th abdominal tergite; internal surface with a weak longitudinal carina terminating before apex in a compressed, rounded, dorso-internal lobe with a spine at tip; behind that lobe cercus compressed and dorsal surface concave and split at apex into two short lobes, the proximal lobe obtuse, the distal lobe acute ( Figs. 19–20 ). Subgenital plate broad at base, suddenly constricted to form a long medial projection with a weak medial and two strong lateral carinae; projection slightly widening to about half of its length, afterwards divided from apex into two lobes; styli very small ( Fig. 37 ).

Titillators separate, elongate, basal parts simple; apical parts rather weakly sclerotised except for marginal areas; internal surface with fine striation or granulation; two-branched: lateral branch forming a roughly ovoid projection in circa middle of titillators; apical branch rounded and on external angle with an obtuse projection ( Figs. 65–66 ). Baso-lateral sclerites large, elongate with irregular margins and a strong longitudinal crest.

Female. Subgenital plate transverse, finely divided in midline by a narrow membranous suture; apical area with two long acute projections connected at base by membrane ( Figs. 76–77 ). Very base of ventral valves of ovipositor above lateral apices of subgenital plate with a small pit ( Fig. 77 ).

Coloration. Uniformly brown. Frons a little orange brown with or without two white strokes at clypeofrontal suture; clypeus yellow, basal area orange; mandibles dark brown. Pronotum with disc yellowish brown or orange brown; paranota a little darker, ochre or medium brown. Tegmen light brown with indistinct brown spots; little darkened at apex. Femora of all legs marmorated but little conspicuous; postfemur with narrow apical area medium brown with a whitish or yellow pre-genicular spot or ring. Ovipositor brown. Female subgenital plate black, apical area medium brown.

Measurements: body male 36–38, female 30–41; pronotum male 10.7–11.2, female 10.5–11.2; tegmen male 39–42, female 46–49; postfemur male 23.5–26, female 26–28; ovipositor 45–49; -height 3.2–3.5 mm.

Diagnosis. Also P. rufus belongs to the species with globose tenth abdominal tergite in male. It differs by the apical projections of the tenth tergite being about as long as the tergite proper and widening apically. The male cerci are similar to those of P. securiformis but with the three apical teeth longer. The male subgenital plate has a long projection as in P. elongatus , P. irregularius and P. securiformis . It differs by the sinuate lateral margins and the rather long apical excision. The titillators are characteristic for the apical part with the main branch being only faintly sclerotised, almost hyaline, and the sclerotised apical cap in middle with a short acute triangular projection. The female subgenital plate has the membranous part provided with two long apical spines. This character it shares with P. securiformis . In P. rufus however, the spines are nearly parallel and upcurved, while in P. securiformis they are straight and approaching each other. In male and female characters, P. rufus comes close to P. securiformis . But all characters also differ significantly in details thus that both must be regarded separate species.

Etymology. The new species is named for the rather uniform brown coloration.

Figures

FIGURES 7–10. Stridulatory files on underside of left tegmen of Paramacroxiphus males: 7, P.aberrans paratype; 8, P. rufus holotype; 9, P. maculatus holotype; 10, P. securiformis holotype.

FIGURES 16–28. Male cercus and tenth abdominal tergite of Paramacroxiphus species: 16, 19, 22, 26, cercus in dorsal view; 17, 20, 23, do. ventral view; 24, 27, do. internal view; 18, 21, 25, 28, male tenth abdominal tergite in dorso-apical (18) or dorsal view (21, 25, 28).—16–18, P.aberrans holotype; 19–21, P.rufus holotype; 22–25, P. maculatus holotype; 26–28, P. securiformis holotype.

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 57–66. Male titillators of Paramacroxiphus species in ventro-distal view (57, 60, 63, 65), dorso-proximal view (58, 61, 64, 66), lateral view (59), and view on apex (62): 57–59, P. aberrans holotype; 60–62, P. securiformis holotype; 63–64, P. maculatus holotype; 65–66, P. rufus holotype. Abbreviations: ap apical part of titillator; as apico-lateral sclerite; bp basal part of titillator; bs baso-lateral sclerite. Scale bars = 1 mm.

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.