Atsigryllus, Cadena-Castañeda & Orejuela, 2020

Cadena-Castañeda, Oscar J. & Orejuela, Mery Helen Tíjaro, 2020, Studies in Colombian Ensifera and adjacent countries: New taxa of smallest field crickets (Orthoptera: Gryllidae: Gryllinae), Zootaxa 4809 (3), pp. 571-581 : 574-576

Atsigryllus n. gen.

http://lsid.speciesfile.org/urn:lsid: Orthoptera .speciesfile.org:TaxonName:509813

Type species: Atsigryllus sikuani n. sp. by monotypy and original designation.

Description. Size small ( Figs. 3A, B ). Head as wide as pronotum, rounded and smooth; eyes ovoid, circular and similar sized ocelli, forming a flat triangle, fastigium wide almost two times the width of scape; maxillary palpi mid-size, third and fourth subequal and cylindrical, the fifth dilated at apex and subtriangular shaped ( Fig. 3C ).

Pronotum. Pronotal disc rectangular slightly wider than long and covered by dense hairs, curved anterior margin, straight posterior margin, square lateral lobules as wide as high and with rounded lateral edge ( Figs. 3A, B ). Legs. Femora without spines; fore tibia with tympanum only on outer side, ovoid and elongated, apex with three spurs, inner ventral spur longest; mid-tibia with three apical spurs and with inners ones longer than outer; hind tibia with five pairs of subapical spurs, the inner spur longer than outer one; four apical spurs on each side; second and dorsal inner spurs similar at length, being the longest ventral and third outer spurs a half of second and dorsal ones. Tarsomeres of the hind leg higher than wide, furrowed dorsally; with two rows of strong dorsal spines. Wings. Fore wings ovoid, completely covering the abdomen, shiny and moderately thickened tegmina; harp with two diagonal veins, slightly divided mirror with an incomplete vein on the lower margin, A 1 vein curved almost parallel to Cu 2 vein, A 2 transversely crossing the basal area of the tegmina, A 3 vein slightly straight, traversing the basal area from the bottom to top, apical area reduced and with reticulated veins ( Fig. 3D ). Abdomen. Tergites covered by short hairs, subgenital plate longer than wide. Male genitalia. Medially section in dorsal view of pseudepiphallic sclerite moderately sclerosed, and with median and lateral lophi reduced ( Figs. 4A, B ), the pseudepiphallic parameres more developed, prominent and wide and lateral view and undivided ( Fig. 4C ). Pseudepiphallic apodemes long; rami not separated posteriorly ( Figs. 4A, B ). Ectophallic fold sclerosed, lanceolate and with triangulated apex ( Fig. 4B ). Ectophallic sclerite long and sclerosed. Endophallic cavity well developed ( Fig. 4B ). Ectophallic arc short, slim and mostly membranous, connected with two lateral and sclerotized apodemes ( Figs. 4B, C ).

Etymology. Refers to the word atsi from the Sikuani (language family Guahibana ) spoken by some of the indigenous people of the region, which means small, with the ending - gryllus, commonly used to genera name of the subfamily Gryllinae .

Distribution. Foot hills of the Colombian plains in confluence with the Andean, Orinoquia and Amazonia regions.

Comparision. Superficially this new genus resembles Zebragryllus Desutter-Grandcolas & Cadena-Castañeda, 2014 , regarding its external morphology; but regarding genitalia, it is similar to the South American genera included in the subtribe Brachytrupina (sensu Gorochov, 2019) or how they were recognized as Modicogryllini (sensu Otte & Alexander, 1983; Otte, 1994), by having an epiphallus with well-developed and rather widely separated lateral lobes. Atsigryllus n. sp. it is one of the smallest genera recorded, as its own characteristic in contrast to the Neotropical Brachytrupina-Modicogryllini, is the rami undivided into its posterior region, and ectophallic fold dorsoventrally divided and not latero-laterally. Differs of Faguagryllus having no denticulations at the distal edges of the pseudepiphallic parameres. Having reduced lateral lobes, it is distinguished from Megalogryllus Chopard, 1930 and Geogryllus in the same way of near genera not yet grouped in any tribe-subtribe as Perugryllus and Laureopsis .

Figures

FIGURE 3. Atsigryllus sikuani n. gen and n. sp. male. A. Habitus in lateral view and B. dorsal view. C. Frons. D. Wings in dorsal view.

FIGURE 4. Atsigryllus sikuani n. gen and n. sp. male genitalia. A. Dorsal. B. Ventral and C. Lateral view respectively.