Rhytidaspis picta Redtenbacher, 1891

Ingrisch, Sigfrid, 2019, Revision of the genus Rhytidaspis Redtenbacher, 1891 including the description of a new genus Haudrhytidaspis gen. nov. (Orthoptera: Tettigoniidae: Conocephalinae), Zootaxa 4661 (2), pp. 343-370: 347-351

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Rhytidaspis picta Redtenbacher, 1891


Rhytidaspis picta Redtenbacher, 1891  

Figs. 1 View FIGURE 1 A–B, 2H–J, 3A–D, 3Y, 5A, 6A, 7D–E, 8D, 9A, 10A–C, 11B, N, S. urn:lsid: Orthoptera   .speciesfile.org:TaxonName:17940

Holotype: Indonesia, Papua Barat: Sekar , [2°43’S, 132°27’E], before 1890, ex Coll. H. Dohrn— 1 male (Warsaw, IZWP). GoogleMaps  

Specimens studied: Indonesia: Papua Barat, MacCluer Gulf , “tusschen Mac Gluerg. Argoenib Noordkost” [Pulau Arguni, 2°39’S 132°33’E], leg. Baggelaar— 1 female ( RMNH) GoogleMaps   ; Papua Barat, Jazirah Bomberai, Fakfak, south coast of Bomberai , elev. 10–100 m [2°56’S, 132°20’E], 3.vi.1959, leg. J.L. Gressitt— 1 male, 1 female nymph ( BPBM) GoogleMaps   ; South Birdshead Peninsula, Maccluer Gulf, Bintuni Bay , Bunda , [2°0’S, 133°30’E], 17.viii.1941, leg. E. Lundquist— 1 male ( RMNH) GoogleMaps   .

Diagnosis. R. picta   differs from all other species of the genus by the male cerci that have the apical tooth inserted at the lateral angle of the apical margin of the ventral lobe while in the other species it is inserted in the middle or closer to the internal angle of the apical margin. The titillators have the granular extension above the U-shaped curvature followed by a short conical projection. In contrast to the situation in other species of the genus the dentate tip of the titillators is twisted against the longitudinal axis.

Male. Stridulatory file on underside of left tegmen 2.7–2.9 mm long, with 95–119 teeth, the about 40 most distant teeth very small and dense, in middle of file with 27–31 teeth per 1 mm ( Fig. 3Y View FIGURE 3 ). Mirror on right tegmen oval with lateral angles sub-angular, 1.3–1.5 mm long 1.9–2.3 mm wide ( Fig. 3B, D View FIGURE 3 ). Cercus with margin of dorsal apical lobe simply lobular with proximal angle not projecting; ventral apical lobe apically widened especially on external side with a rather large spine inserted near external angle of apical margin pointing mediad ( Fig. 5A View FIGURE 5 ). Titillators U-shaped in middle and curved at base too; in U-shaped center with a roughly semi-oval extension that is granular along margin and on internal surface, membranous on external surface; that structure is followed by a short conical, obtuse projection with finely granular margin ( Fig. 8D View FIGURE 8 ). Apical branch of titillators twisted in a roughly 90-degree angle against the U-shaped curvature and provided at tip with few rather large teeth ( Fig. 9A View FIGURE 9 , 10 View FIGURE 10 A–B). Parallel to the apical branch runs an elongate, little curved and obtuse projection at dorso-proximal side. Apico-lateral sclerites oval, compressed.

Female. Subgenital plate with lateral margins of ventral surface rather regularly approaching from base to tip but shortly behind mid length on both sides with a roughly oval but narrow extension bent dorsad (arrow in Figs. 11B, N View FIGURE 11 ); apical lobes rather narrow and long, with acute tip ( Fig. 11S View FIGURE 11 ).

Coloration (male). Head, pronotum, legs dark red brown; ventral area of fastigium verticis, antennal scrobae, scapus and pedicellus black, flagellum in basal area reddish, afterwards yellowish. Face dark red, clypeus yellow or green, labrum and visible part of mandibles orange red or red brown ( Figs. 2 View FIGURE 2 H–J). Abdominal tergites varying from black with a medium to dark brown medial band to yellowish or orange brown along midline with black hind margin and black lateral bands; central area of tenth abdominal tergite with apical cones and cerci yellowish brown ( Fig. 1A View FIGURE 1 ). Thoracic pleura black. Meso- and metasternum black; abdominal sternites yellow or dark reddish brown. Tegmen yellow with few scattered black dots; stridulatory area subtransparent ( Figs. 3 View FIGURE 3 A–D). Coxa and trochanter of all legs black; fore and mid femora with black transverse strokes, hind femur in basal third to basal half black or blackish red, afterwards medium brown; tibiae of all legs light to medium brown, spines with black tips. Projections of male tenth abdominal tergite orange yellow; cerci yellow. Male subgenital plate black except at very base; styli black with yellow tip.

Coloration (female). Head dark ochre brown; fastigium verticis dorsally brown, ventrally black; antennal scrobae, scapus and pedicellus black, flagellum yellow; sub-ocular carina not conspicuously darkened; labrum and mandibles orange, lower part of clypeus green, palpi yellow. Pronotum dark ochre brown. Abdominal tergites yellowish ochre with brown hind margins and dark brown to black lateral bands, last tergite and cerci yellow. Meso- and metasternum black; abdominal sternites yellow to light brown. Tegmen yellow with few scattered black dots. Legs light ochre, coxa and trochanter of all legs black or dark brown, anterior and median femur with black transverse strokes, hind femur in about basal third dark brown to black followed by few transverse strokes. Female subgenital plate black; ovipositor medium brown, lighter in basal area but very base black.

Measurements (3 males, 1 female).—Body: male 40–42, female 43; pronotum: male 12.5–13.0, female 11.5; tegmen: male 8.5–9.0, female 5; hind femur: male 24–26, female 28.5; anterior femur: male 14, female 15; antenna: male 135, female 120; ovipositor: female 25 mm.


National Museum of Natural History, Naturalis


Bishop Museum