Rhytidaspis 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 : 345

publication ID

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

publication LSID

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

persistent identifier

https://treatment.plazi.org/id/03CEF84A-FFAE-FFF3-FF67-56D133843F83

treatment provided by

Plazi

scientific name

Rhytidaspis Redtenbacher, 1891
status

 

Rhytidaspis Redtenbacher, 1891 View in CoL

urn:lsid: Orthoptera .speciesfile.org:TaxonName:17939

Type species: Rhytidaspis picta Redtenbacher, 1891 , by original monotypy.

Medium sized to large species. Fastigium verticis laterally compressed and wide in about basal two thirds, spiniform in apical third, with a small dorsal tubercle; separated from fastigium frontis by a narrow furrow ( Figs. 10 View FIGURE 10 M–N). Frons covered with wide pits; from ventral margin of compound eye to above base of mandible with a slightly curved, granular, projecting ridge; genae faintly concave. Pronotum rugose, elongate, laterally rounded into narrow paranota, with a strong transverse furrow behind middle; anterior margin rounded; apical area in male little elevated and hind margin rounded, in female even and hind margin sub-truncate to slightly concave; ventral margin behind rounded anterior angle sub-straight with a narrow ventral lobe just before and a laterally projecting lobe above auditory spiracle, the latter lobe in female smaller than in male; humeral sinus distinct. Auditory spiracle covered from anterior and dorsal side, open posteriorly and ventrally ( Fig. 10L View FIGURE 10 ). Wings strongly reduced, tegmen micropterous in male, squamipterous in female, base covered by pronotum; hind wings reduced to membranous lobes without venation. Prosternum bi-spinose with a pair of long spines; meso- and metasternal lobes rather short, mesosternal lobes with acute triangular tips, metasternal lobes with short apical cone. All femora with spines on both ventral margins; genicular area of hind femur basically bi-spinose with the ventral spine usually smaller than the dorsal spine and often missing.

Male. Tenth abdominal tergite with a pair of obtuse, pilose, apical lobes. Epiproct roughly triangular with rounded tip, depressed in middle. Paraprotes with long, compressed apical projections ( Fig. 6B View FIGURE 6 ). Cerci divided in apical area into a dorsal and a ventral lobe, the dorsal lobe curved apico-mediad, the ventral lobe running straight behind; their shapes vary between species ( Figs. 5–7 View FIGURE 5 View FIGURE 6 View FIGURE 7 ). Titillators with one pair of large, central sclerites and two pairs of small separate sclerites in apical area. The shape of the sclerites and the connected granular structures vary in detail between species, but they are based on the following common scheme: A pair of stout and elongate sclerites perform in about mid-length a huge U-shaped curvature; often the basal area is also curved thus that basal and central area together look S-shaped. The apical area of these sclerites is about straight. The central, U-shaped curvature supports along margin a granular stiffened structure of the membrane enclosing the sclerites. The outer surface of that structure is simply membranous, while the inner surface and the margin along top of the curve are granular and at base linked with the opposite structure by a stout muscular rope ( Figs. 9 View FIGURE 9 F–G). Thus, both titillators obviously form a functional unit, and the inner side of these outgrowths can only be fully seen when that connecting rope is cut ( Figs. 8A, E View FIGURE 8 ). The shape of the curvature and especially that of the granular structure on top of it varies between species ( Figs 8–10 View FIGURE 8 View FIGURE 9 View FIGURE 10 ). The tip of the titillators is covered with spinules and also varies between species. In apical area of the large sclerites, in situ on dorso-proximal side there is another pair of simple elongate sclerites enclosed by the same membranes as the tips of the large sclerites. Finally, the external side of these membranes enclose a roughly oval and flat apico-lateral sclerite. Subgenital plate wide at base, lateral areas up-bent; lateral margins in ventral view moderately approaching toward end; apical margin with V- or U-shaped incision; styli elongate.

Female. Subgenital plate with ventral disc elongate with converging lateral margins and sometimes provided with a faint medial carina, apical area up-curved and divided into two angular lobes; lateral expansions upcurved and largely membranous, along margins stiffened, often broadly furrowed or with concave surface, wide at base, narrowing backward, but not fully reaching tip of ventral surface of subgenital plate. Ovipositor robust, elongate and in about apical half little up-curved, tip acute; ventral ovipositor valves at base with stout, elongate, ventral swellings, in situ hidden under subgenital plate.

Etymology. The genus name is obviously based on the Latin words rhytium drinking-horn and aspis asp viper and probably refers to the shape of the long fastigium verticis. The genus name was treated as of female gender by Rhedtenbacher (1891).

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Orthoptera

Family

Tettigoniidae

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