Siamgryllacris Ingrisch 2018, gen. nov.
Creators: name: Ingrisch, Sigfrid
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Orthoptera
Gryllacrididae
Siamgryllacris

description: Siamgryllacris gen. nov.
Type species: Siamgryllacris rufa sp. nov.
Diagnosis. The new genus is similar to Phryganogryllacris but less slender, of stouter appearance. It differs from the latter genus by the male abdominal appendages do not arise from from the latero-apical margins of the ninth abdominal tergite but as medial appendages of the tenth abdominal tergite. This tergite is interrupted in middle and at the median ends prolonged into a projecting, basically compressed appendage, globularly widening at tip and with a compressed medial rim (Figs. 86 A–E). Both rims together forming a pliers-shaped apparatus while in Phryganogryllacris the appendages of the ninth tergite terminate into outward curved spines.
Siamgryllacris is probably related to Dialarnaca, with which it shares a short obtuse lobe in middle of the apical margin of the globular male ninth abdominal tergite that is followed ventrally by a shallow groove. The abdominal appendages come from tenth abdominal tergite in both genera. But in the new genus that tergite is widely divided in middle with the medial margins carrying a together pincers-shaped projection while in Dialarnaca that tergite is undivided and provided with a pair of upcurved spine-like projections.
Females of Siamgryllacris differ from Dialarnaca, Phryganogryllacris and other genera of Gryllacridinae by the possession of a projection from sixth abdominal sternite instead of only from seventh sternite. The ovipositor is elongate and straight but stouter than in Phryganogryllacris and without the upcurved tip as in Dialarnaca (a female of this genus has only been described for D. longicerca Shi & Bian, 2016).
Description. Tegmen with free media anterior; cubitus anterior is single-branched at base, when it divides, the anterior branch approaches MA in a curvature or fully fuses with it for a short distance, after it deviated or divided it divides again into MP and CuA1, rarely MP arises from MA and CuA remains undivided. Male eighth abdominal tergite little prolonged, unmodified. Ninth abdominal tergite in centre, where it starts to become down-curved, with a short granular lobe; below that lobe tergite wide shallowly grooved and with a medial furrow. Tenth abdominal tergite distinct, band-shaped but interrupted in middle; at both sides of interruption with a basically compressed appendage swollen at tip and with a compressed medial rim. Male subgenital plate about as wide as long with wide subtruncate medial lobe; styli thin and short, inserted laterally, little surpassing tip of medial lobe. Female sixth abdominal sternite with a narrow, rounded medial projection overlapping base of seventh sternite; seventh sternite with basal margin little excised in middle forming a membranous pit between sixth and seventh sternite. Female subgenital plate distinctly sclerotised, bowed from left to right. Ovipositor substraight, without apical modification.
description: Published as part of Ingrisch, Sigfrid, 2018, New taxa and records of Gryllacrididae (Orthoptera, Stenopelmatoidea) from South East Asia and New Guinea with a key to the genera, pp. 1-278 in Zootaxa 4510 (1) on page 238, DOI: 10.11646/zootaxa.4510.1.1, http://zenodo.org/record/10072806