Haudrhytidaspis, Ingrisch, 2019

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: 368-369

publication ID

https://doi.org/10.11646/zootaxa.4661.2.5

publication LSID

lsid:zoobank.org:pub:71122FBE-0022-4D1F-B200-3946D770CAE8

persistent identifier

http://treatment.plazi.org/id/03CEF84A-FFB5-FFEB-FF67-53B036D639F6

treatment provided by

Plazi

scientific name

Haudrhytidaspis
status

gen. n.

Haudrhytidaspis   gen. n.

Type species: Rhytidaspis fusca Karny, 1911   —here designated

Diagnosis. The new genus differs from Rhytidaspis   by the following characters: The fastigium verticis is rather short, hardly surpassing scapus, triangular and dorsoventrally compressed instead of long and laterally compressed with narrow conical apical area; the face is robust and wide with the surface finely rugose with strong, irregular rugae and small impressed dots and gradually passes into genae ( Fig. 2Q View FIGURE 2 ), while In Rhytidaspis   it appears rather narrow, elongate with the surface covered with large impressed dots and the face is separated from the genae by strong sub-ocular carinae. The fore tibiae are markedly angular with the surface below the tympana coarsely rugose instead of nearly subsmooth and the hind femora carry thorns only on the external ventral margin instead of on both ventral margins as in Rhytidaspis   . The pronotum in Haudrhytidaspis   is short with only one transverse furrow, has the ventral margin convex and the humeral sinus only weakly indicated ( Fig. 11Y View FIGURE 11 ), while in Rhytidaspis   it is elongate, with concave ventral margin, two transverse furrows, and a distinct humeral sinus. The female subgenital plate is short in the new genus, hardly covering the base of the ovipositor, funnel-shaped with gradually up-curved lateral margins and at the apical margin there is only a weak incision in middle ( Fig. 11X View FIGURE 11 ), while in Rhytidaspis   the subgenital plate has the ventral surface elongate triangular with bifid tip while the lateral areas are almost vertically up-bent and for a large part membranous. The very base of the ventral ovipositor valves starts at base with a narrow transverse bulge ( Fig. 11X View FIGURE 11 ) while in Rhytidaspis   there are long, swollen extensions at base of the ventral ovipositor valves. The ovipositor in the new genus is slightly but regularly curved throughout its length and the ventral valves are in apical area of ventral valves faintly serrated ( Fig. 11X View FIGURE 11 ), while in Rhytidaspis   the ovipositor is sub-straight in about basal half and slightly curved in apical half and the margin of the ventral valves is smooth until tip.

The outline of the robust head of Haudrhytidaspis   with a short fastigium verticis, the sculpture of the face, the short meso- and metasternal lobes, and the angular fore tibiae with short spines resemble some species of the genus Salomona Blanchard, 1853   . Haudrhytidaspis   differs however strikingly by the low, rounded pronotum with only a faint indication of a humeral sinus and a single interrupted transverse sulcus, the sub-straight, only faintly curved ovipositor and the strongly reduced wings speak against any affinity with that genus. The short rectangular female subgenital plate that hardly covers the base of the ovipositor is also of diagnostic value. The combination of characters listed before differentiates the new genus also from other genera of Australasian Agraeciini   .