Mellogryllus mutus Cadena-Castañeda & Tavares & Fernandes 2022, n. sp.
Creators: name: Cadena-Castañeda, Oscar J.
name: Tavares, Gustavo Costa
name: Fernandes, José Antônio Marin
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Orthoptera
Gryllidae
Mellogryllus
Mellogryllus mutus

description: Mellogryllus mutus n. sp. Cadena-Castañeda, Tavares & Fernandes
urn:lsid:zoobank.org:act: 50BA059E-5E46-4D47-8BE5-FE259FDAFC55 http://lsid.speciesfile.org/urn:lsid: Orthoptera.speciesfile.org:TaxonName:517801
Etymology. Named regarding the absence of morphological structures for sound emission.
Type material. Holotype. Male. BRAZIL, Bahia, Ilhéus, 02–04.XI.2021, C. Souza & F. Albuquerque cols., Floresta ombrófila [ombrophilous forest], pitffal. Repository: MPEG.
Paratype. Female. BRAZIL, Bahia, Ilhéus, 29–31.X.2021, C. Souza & F. Albuquerque cols., Floresta ombrófila [ombrophilous forest], pitffal. Repository: MPEG.
Description. In addition to the characters of the genus: Male. Small-sized. Body predominantly dark brown (Figs. 1A–B); cephalic capsule with the dorsal surface (from the vertex to the fastigium) and the upper area of frons also dark-brown; area surrounding the ocelli, mandibles, lower margin of genae and frons ocher; ocelli yellow; eyes black (Figs. 2A–C); inner side of the mesal portion of fore and mid femora yellowish-brown; hind legs light brown, spurs of hind tibia yellowish, with apex black. Abdominal segments dark brown, with a conspicuous whitish stripe on the posterior border; epiproctus and base of cerci also whitish (Figs. 1A–B; 2E–F, J–L). Tegmina ovoid, scalelike, extremely reduced, reaching only the anterior border of the first tergite, never touching in resting position, without distinctive venation, surface only with small whitish punctuations (Figs. 2C–D). Fore coxae well-developed; fore femur and tibia progressively widening toward the apex; first tarsomere markedly dilated from the base to the apex, second and third tarsomeres normally developed, like other field crickets (Figs. 2E–F). Tympana absent. Outer surface of the fore tibia and the first tarsal segment bearing conspicuous setae (Fig. 2F) and the inner surface with small bristles (Fig. 2E). Foretibia with two prominent distal spurs on the inner side (Fig. 2E) and one spur on the outer side (Fig. 2F). Mid tibia widening toward the apex, armed with two apical spurs on each side; tarsomeres with normal development. Hind tibia with three spurs on outer dorsal margin and four spurs on inner dorsal margin; apex with three spurs on both sides, the middle one is the longest; tarsomeres with seven outers and six inner dorsal spines (Figs. 2J–L). Epiproctus covered by many bristles (Fig. 2H); cerci almost as long as the hind tibia, covered by abundant medium-sized bristles, alternated by noticeably long ones (Fig. 1A). Genitalia (Fig. 3): MLPs with bristles on their surface (more abundant on the inner margin of the lobes), each lobe tapering towards the rounded apex. Ps. P. conical and moderately widened. Ec. f. undivided, thin, with pointed apex, and not exceeding the notch of the MLPs, with a shallow groove along its length. Ec.s. ribbon-shaped, with the inner edge curved and the outer edge wavy. R extending to the anterior margin, twice as long as the MLPs. Arc w-shaped in dorsal view. V ovoid and connected at the base of En. c.
Female. Similar to the male in shape and size, differing by the following characteristics: The color tones are darker than the male but keep the same pattern (Figs. 4A–B). Tegmina not reaching the posterior border of the metanotum, widely separated from each other (Figs. 4A; 5A). Tympanum present only on the external face of the foretibia, ovoid and elongated, occupying a third of the tibia outer surface (Figs. 5B–C). Left hind tibia with four spurs on each dorsal margin (Fig. 5I); right hind tibia with four spurs on the inner dorsal margin, and three spurs on the outer dorsal margin (Fig. 5H). Epiproct ovoid, with rounded posterior margin (Fig. 5E). Ovipositor almost straight, apex of the valves pointed, with sharp angles (Fig. 5J), and triangular in dorsal view (Fig. 5K). Subgenital plate trapezoid, apex truncated (Fig. 5F).
Measurements (in mm.). Holotype: LB: 9.6; Pr: 2.3; Teg: 0.7; HF: 4.4; HT: 2.5. Paratype: LB: 10.9; Pr: 2.3; Teg: 0.5; HF: 5.5; HT: 2.7; Ov: 3.6.
description: Published as part of Cadena-Castañeda, Oscar J., Tavares, Gustavo Costa & Fernandes, José Antônio Marin, 2022, Studies on Neotropical crickets: Mellogryllus mutus n. gen. et n. sp., an intriguing new genus and species of cricket of the Miogryllae Group (Orthoptera: Gryllidae Gryllinae: Gryllini: Brachytrupina) from the Brazilian Atlantic Forest, pp. 408-420 in Zootaxa 5125 (4) on pages 412-417, DOI: 10.11646/zootaxa.5125.4.4, http://zenodo.org/record/6450885