Lutosa marginalis Walker, 1869

Cadena-Castañeda, Oscar J., García, Alexander García, Nos, Maria Del Pilar Castella-, Sarmiento, Juan Pablo Prias & Tavares, Gustavo Costa, 2022, Studies on chevron crickets: Contribution to the knowledge of Lutosinae / ini taxa (Orthoptera: Anostostomatidae), Zootaxa 5178 (4), pp. 347-379 : 356-359

Lutosa marginalis Walker, 1869

( Fig. 5 )

http://lsid.speciesfile.org/urn:lsid: Orthoptera .speciesfile.org:TaxonName:20065

Redescription. Female. Medium-sized (18 mm), body dorsally dark reddish-brown with a dorsal yellowish midline from the pronotum to the last abdominal segments, laterally yellow, body ventrally ochre; fore- and midfemora ventrally and first half of tibiae dark brown; tarsi, cerci and base of ovipositor light yellow ( Fig. 5A ). Face with disperse grey spots ( Fig. 5B ). Lateral lobes of pronotum with most of ventral half ochre ( Fig. 5C ). Head. Fastigium of vertex angulated. Fastigium of frons rounded, touching fastigium of vertex. Clypeus almost as wide as high and subtriangular. Eyes completely pigmented and ocelli ovoid ( Fig. 5B ). Thorax. Pronotum not very high and with short hairs on anterior edge. Anterior and posterior edges of pronotal disc rounded ( Fig. 5C ). Legs. Fore tibia with rounded and small tympana on both sides, dorsal margin with a middle spur on each side of the tibia, the longest being the inner spur; apex with two dorsal spurs similar in size, one on each side; ventrally with four similar-sized spurs on each margin. Mid-tibia dorsally armed with four spurs on the inner margin and three on the outer one; ventrally with four spurs on outer margin and three on inner one. Hind femur with eleven chevron stripes on outer face; ventral margin without undulations. Hind tibia straight and with eleven spines on each dorsal margin, apical dorsal spur twice longer than preapical spur. Abdomen without denticulations in the first tergites. Ninth tergite not covering the tenth tergite. Tenth tergite narrow and divided into two ovoid lateral segments, lateral region protruding in lateral view, with the posterior border in two straight lines. Epiproct like a pentagon; cerci slender and mediumsized; paraprocts flexible, dorsoventrally compressed and surrounding ventrally the epiproct ( Fig. 5D ). Ovipositor as long as two-thirds of the length of the hind femur, curving progressively from the basal region towards the apex ( Fig. 5E ). Subgenital plate triangular, wider than long, posterior edge rounded truncated ( Fig. 5F ).

Male. Unknown.

Measurements (in mm.). LB: 18. Pr: 7. HF: 17. HT: 16. Ov: 10.

Holotype data. Female. Locality unknown, 59.57 Vigors’ Coll. ( BMHN)

Specimen examined. Female. Brazil, São Paulo, Jundiaí, Reserva Biológica Serra do Japi. 05-07 XI, 2012. Dias, P.G.B.S.; Dios, R. et al. ( CAUD).

Comments. It is important to have specimens with a precise locality, as opposed to the holotype, with an unknown locality. When reviewing this specimen, it fits the morphological characteristics of L. marginalis , so a redescription is very useful to define the species, and even more important to give stability to the genus, corroborating that the other known species (redefined here) are related to L. marginalis (type species). Obviously, it is still necessary to study males of this species to clear up any other doubts about the generic limits of Lutosa , but this will be feasible in the future with the locality studied here. L. marginalis is the smallest known species, in contrast to other species that can be double or almost triple its length.

Figures

FIGURE 5. Lutosa marginalis female. A. Habitus in lateral view. B. Face. C. Head and thorax in lateral view. D. Terminalia in dorsal and E. lateral view respectively. F. Subgenital plate.