Dicranostomus monoceros Dohrn, 1888

Heller, Klaus-Gerhard & Helb, Matthias, 2021, Revision of the tusked bush-crickets (Tettigonioidea: Pseudophyllinae: Dicranostomus) with description of the hitherto unknown sexes, Journal of Orthoptera Research 30 (1), pp. 87-94 : 87

publication ID	https://dx.doi.org/10.3897/jor.30.62170
publication LSID	lsid:zoobank.org:pub:4BE14BC8-A200-42AA-BC49-6DE823F62085
persistent identifier	https://treatment.plazi.org/id/B1BCF4B6-3161-5983-B8F4-AFF69BE997D2
treatment provided by	Journal of Orthoptera Research by Pensoft
scientific name	Dicranostomus monoceros Dohrn, 1888
status

Treatment

Dicranostomus monoceros Dohrn, 1888 Figs 1A View Fig. 1 , 2A-D View Fig. 2 , 3A, B View Fig. 3 , 4A View Fig. 4 , 5A View Fig. 5 , 6A View Fig. 6

Dicranostomus monoceros Dohrn, 1888: 362

Holotype. -

PERU • ♀; Cumbasi Peruviae ad Huallagam; [Cumbaza]; MZPW. [photos in Cigliano et al. 2021].

Material examined. -

PERU • 2♂; San Martin Region, Prov. Rioja, Nueva Cajamarca; 10 Nov. 2016; local collector; C_ Helb 8771-C_ Helb 8772 • 1♀, 1♂; San Martin Region, Prov. Rioja, Nueva Cajamarca; Mar. 2018; local collector; C_ Helb 8773-C_ Helb 8774 • 2♂; San Martin Region, Prov. Rioja, confluente Altomayo river / Naranjos ; 8 Mar. 2018 & 25 Apr. 2018; local collector; C_ Helb 8775 , ♂ C_Helb8776.

Remarks. -

Up to now, the species was known only by the female holotype. In one female (C_Helb8773), the right foreleg is irregularly developed. Its tibia does not have a tympanic organ or dorsal black tubercles (Fig. 2 View Fig. 2 ).

Redescription. -

General characters as genus.

Male. Fastigium frontis elongated horizontally (Fig. 2 View Fig. 2 ), mandibles each with one long (2.1-2.8 times as long as pronotum) process (tusk) (Figs 1 View Fig. 1 , 2 View Fig. 2 ; Table 1 View Table 1 ). Pronotum weakly granulated. Fore and mid femora ventrally with 3 spines, hind femora with 4 spines at anterior edge. Fore tibiae dorsally with 2-3 large, black, blunt spine-like tubercles at the anterior and two small tubercles at the posterior edge, ventrally with ca. 6 spines on both sides, mid tibia dorsally with 1-2 spines on posterior edge, ventrally with ca. 6 spines on both sides, hind tibia with ca. 8 spines on all edges, the dorsal larger than the ventral spines. Mirror cell in left tegmen triangular with broadly rounded distal tip, on right tegmen larger, subquadratical (Fig. 3 View Fig. 3 ). Stridulatory file on lower side of left tegmen with ca. 130 regularly spaced teeth (inter-tooth interval 20-23 µm; Fig. 4 View Fig. 4 ; n=1 file). Supraanal plate transverse, distally rounded. Subgenital plate elongated, with ca. 1 mm long styli. Cerci with internal subapical spine and blunt apical process directed very slightly inwards.

Female. General characters as genus and male. Mandibles each with one long (0.8-0.9 times as long as pronotum), slightly upcurved process (tusk). Subgenital plate transverse, at the end straightly cut and distally slightly notched in the middle.

Coloration. Head with tusks and pronotum chestnut (tusks becoming darker towards the tips); legs yellowish, but knees, tympanic organ and tubercles in the fore tibia and larger spines in all legs black. Tegmina as in D. nitidus (see below). In some animals, the anterior and central lower parts of the paranota are brighter and more yellowish than the other parts.

Measurements. -

See Table 1 View Table 1 .