Tintiyakus sexangulus Mendes, Heleodoro & Ramos-Pastrana 2020
Creators: name: Mendes, Diego Matheus De Mello
name: Cadena-Castañeda, Oscar J.
name: Heleodoro, Raphael Aquino
name: Ramos-Pastrana, Yardany
name: Rafael, José Albertino
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Orthoptera
Anostostomatidae
Tintiyakus
Tintiyakus sexangulus

description: Tintiyakus sexangulus Mendes, Heleodoro & Ramos-Pastrana p. nov.
http://lsid.speciesfile.org/urn:lsid: Orthoptera.speciesfile.org:TaxonName:506707
Figures 1–4 and 8
Diagnosis. Cercus setose, conspicuously widened at anterior half, gradually narrowing at posterior half (Fig. 1 D–F). Subgenital plate hexagonal, with basal margin straight, gradually widening at basal third of lateral margin, then gradually narrowing from medial third of lateral margin towards apical margin; apical margin emarginated by thin slit (Fig. 1E). Stylus slightly inward curved. Male genitalia with titillator’s process light yellow, with right longitudinal half overlapping left longitudinal half (Figs. 2 A–B). Ejaculatory vesicles conspicuously smaller than titillator’s process (Figs. 2 C–D).
Etymology. From Latin sexangulus = hexagonal, referring to the shape of the male’s subgenital plate.
Type material. Holotype ♂: COLOMBIA, Caquetá, Florencia, Vda. [Vereda] Las Dalias, altitude 348 m, 01°29’24.8”N / 75°24’29.6”W, 18.v.2012, coleta manual em bosque secundario, Y. Ramos leg. (LEUA); Paratypes: idem, Vda. [Vereda] Aguas Negras, 01°40’30.06”N / 75°36’8.59”W, 370 m, 04.iv.2013, coleta manual em bosque secundario, Y. Ramos leg. (1♀ – INPA); idem, 27.iv.2012 (1♂ – INPA); idem, Vda. [Vereda] El Limón, Finca El Limón, 01°22’24.3”N / 75°36’36.6”W, 643 m, 30.ix.2015, coleta manual em bosque secundário, Y. Ramos leg. (1♀ – LEUA).
Description.
Male. Head. Fastigium of vertex frontally projected, subtrapezoidal with apical margin emarginated, thinner than scapus (Fig. 1B). Fastigium of frons inconspicuous. Frons with light yellow and light brown spots (Fig. 1C). Clypeus subtriangular, with conspicuous medial emargination at basal margin; lateral margin gradually narrowing towards apical margin, slightly curved; apical margin arched (Fig. 1C). Labrum asymmetrical, subtriangular (Fig 1. C). Antenna light brown, antenna partially broken; scapus 1.4 times larger than pedicel. Compound eye oval, light brown with black spots (dry) (Fig. 1 A–C). Mandibular palpus long, approximately 1.3 times shorter than posterior tibia; last mandibular palpomere rounded, 3.2 times shorter than penultimate mandibular palpomere (Fig. 1 A–C). Maxillary palpus at least three times shorter than mandibular palpus.
Thorax. Slightly shiny, with light brown spots (Figs. 1 A–B). Pronotum in dorsal view long and wide, with lateral margin slightly sinuous; lobe of pronotum with dorsal margin nearly straight, slightly convex at ventral margin (Fig. 1B). Mesonotum rectangular in dorsal view, 2.5 times shorter than pronotum and 1.2 times shorter than metanotum, with lateroapical margins projected over metanotum (Fig. 1B). Metanotum trapezoidal in dorsal view, with basal margin wider than apical margin (Fig. 1B).
Legs. Fore tibia with one dorsoposterior spine, five ventroanterior and two ventroposterior spines (Figs. 1 A–B). Mid tibia with three dorsoanterior, four ventroanterior, three dorsoposterior and 5 ventroposterior spines (Fig. 1 A– B). Hind femur posteriorly with 13 chevron ridges (Fig. 1A).
Abdomen. Cercus setose, conspicuously widened at anterior half, gradually narrowing at posterior half (Fig. 1 D–F). Subgenital plate hexagonal, with straight basal margin; gradually widening at basal third of lateral margin, then gradually narrowing from medial third of lateral margin towards apical margin; apical margin emarginated by thin slit (Fig. 1E). Stylus cylindrical, slightly inward curved, with rounded apex (Fig. 1 D–F).
Genitalia. Dorsally with anterior margin conspicuously projected (Fig. 2 A–D); titillator’s process light yellow, with right longitudinal half overlapping left longitudinal half (Fig. 2 A–B). Ejaculatory vesicles ellipticals, conspicuously smaller than titillator’s process (Fig. 2 C–D).
Coloration. Described based on dry specimen (Fig. 1 A–B). Anterior portion of the body dark brown, posterior portion light brown.
Female. Like the male (Fig 3 A–E), except for:
Abdomen. Supra anal plate with apical margin arched, slightly sinuous (Fig. 3D). Cercus with homogenous width until abruptly narrowing at apical third (Fig. 3 C–E). Subgenital plate subtriangular, with lateral margin gradually narrowing towards apex, apical margin arched (Fig. 3C). Ovipositor dark brown, shiny, slender, conspicuously arched, slightly pointed dorsally, with rounded apex (Fig. 3E).
Nymph. Older nymphs are very similar to adults, differing by the lighter coloration and by the not fully developed terminalia.
Measurements (mm). TL: male 29 / female 33–30,2; WF: male 5,7 / female 5,3; PL: male 7,8 / female 9,5–9,2; PH: male 5,6 / female 5,7–5,5; FF: male 10,2 / female 14–10,4: FT: male 11,4 / female 12–11,3; MF: male 10,5 / female 14–11,7: MT: male 13,5 / female 14–13,7; HF: male 25,4 / female 29,7–26,1; HT: male 23,5 / female 27,3–24,7; PL: male 5,3 / female 3,7–3,5; LC: male 3,9 / female 3,2–3; OL: 15,3–13,2.
Environmental notes. The specimens were collected in a tropical rainforest (Holdridge 1996). The locality “Reserva Natural y Ecoturistica Las Dalias” is located in a relic of secondary forest, on the banks of the “La Cajona” stream, the specific collection site is composed of forest and herbaceous vegetation. The Locality of the “Finca El Limón” is on the banks of the “La Morrocoya” stream, where the predominant vegetation are bushes. The locality “Vereda Aguas Negras” is part of a riparian forest on the “La Perdiz” stream. All the specimens were found near water bodies (Fig. 4A) and in flooded areas (Fig. 4B).
description: Published as part of Mendes, Diego Matheus De Mello, Cadena-Castañeda, Oscar J., Heleodoro, Raphael Aquino, Ramos-Pastrana, Yardany & Rafael, José Albertino, 2020, A new genus of chevron cricket (Orthoptera: Anostostomatidae: Lutosinae) from the Colombian and Venezuelan Amazon Rainforest, pp. 538-550 in Zootaxa 4729 (4) on pages 545-546, DOI: 10.11646/zootaxa.4729.4.5, http://zenodo.org/record/3751883