Tintiyakus sexangulus Mendes, Heleodoro & Ramos-Pastrana

Mendes, Diego Matheus De Mello, Cadena-Castañeda, Oscar J., Heleodoro, Raphael Aquino, Ramos-Pastrana, Yardany & Rafael, José Al, 2020, A new genus of chevron cricket (Orthoptera: Anostostomatidae: Lutosinae) from the Colombian and Venezuelan Amazon Rainforest, Zootaxa 4729 (4), pp. 538-550: 545-546

publication ID

https://doi.org/10.11646/zootaxa.4729.4.5

publication LSID

lsid:zoobank.org:pub:E4213118-C7BD-4860-83FE-4FF1059C440C

DOI

http://doi.org/10.5281/zenodo.3808705

persistent identifier

http://treatment.plazi.org/id/9F5A87C7-FFDE-FFB7-FF4F-F335FD78A3BE

treatment provided by

Carolina

scientific name

Tintiyakus sexangulus Mendes, Heleodoro & Ramos-Pastrana
status

 

Tintiyakus sexangulus Mendes, Heleodoro & Ramos-Pastrana  p. nov.

http://lsid.speciesfile.org/urn:lsid: Orthoptera  .speciesfile.org:TaxonName:506707

Figures 1–4View FIGURE 1View FIGURE 2View FIGURE 3View FIGURE 4 and 8View FIGURE 8

Diagnosis. Cercus setose, conspicuously widened at anterior half, gradually narrowing at posterior half ( Fig. 1View FIGURE 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. 1EView FIGURE 1). Stylus slightly inward curved. Male genitalia with titillator’s process light yellow, with right longitudinal half overlapping left longitudinal half ( Figs. 2View FIGURE 2 A–B). Ejaculatory vesicles conspicuously smaller than titillator’s process ( Figs. 2View FIGURE 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)GoogleMaps  ; 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)GoogleMaps  ; idem, 27.iv.2012 (1♂ – INPA)GoogleMaps  ; 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)GoogleMaps  .

Description.

Male. Head. Fastigium of vertex frontally projected, subtrapezoidal with apical margin emarginated, thinner than scapus ( Fig. 1BView FIGURE 1). Fastigium of frons inconspicuous. Frons with light yellow and light brown spots ( Fig. 1CView FIGURE 1). Clypeus subtriangular, with conspicuous medial emargination at basal margin; lateral margin gradually narrowing towards apical margin, slightly curved; apical margin arched ( Fig. 1CView FIGURE 1). Labrum asymmetrical, subtriangular ( Fig 1. CView FIGURE 1). Antenna light brown, antenna partially broken; scapus 1.4 times larger than pedicel. Compound eye oval, light brown with black spots (dry) ( Fig. 1View FIGURE 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. 1View FIGURE 1 A–C). Maxillary palpus at least three times shorter than mandibular palpus.

Thorax. Slightly shiny, with light brown spots ( Figs. 1View FIGURE 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. 1BView FIGURE 1). 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. 1BView FIGURE 1). Metanotum trapezoidal in dorsal view, with basal margin wider than apical margin ( Fig. 1BView FIGURE 1).

Legs. Fore tibia with one dorsoposterior spine, five ventroanterior and two ventroposterior spines ( Figs. 1View FIGURE 1 A–B). Mid tibia with three dorsoanterior, four ventroanterior, three dorsoposterior and 5 ventroposterior spines ( Fig. 1View FIGURE 1 A– B). Hind femur posteriorly with 13 chevron ridges ( Fig. 1AView FIGURE 1).

Abdomen. Cercus setose, conspicuously widened at anterior half, gradually narrowing at posterior half ( Fig. 1View FIGURE 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. 1EView FIGURE 1). Stylus cylindrical, slightly inward curved, with rounded apex ( Fig. 1View FIGURE 1 D–F).

Genitalia. Dorsally with anterior margin conspicuously projected ( Fig. 2View FIGURE 2 A–D); titillator’s process light yellow, with right longitudinal half overlapping left longitudinal half ( Fig. 2View FIGURE 2 A–B). Ejaculatory vesicles ellipticals, conspicuously smaller than titillator’s process ( Fig. 2View FIGURE 2 C–D).

Coloration. Described based on dry specimen ( Fig. 1View FIGURE 1 A–B). Anterior portion of the body dark brown, posterior portion light brown.

Female. Like the male ( Fig 3View FIGURE 3 A–E), except for:

Abdomen. Supra anal plate with apical margin arched, slightly sinuous ( Fig. 3DView FIGURE 3). Cercus with homogenous width until abruptly narrowing at apical third ( Fig. 3View FIGURE 3 C–E). Subgenital plate subtriangular, with lateral margin gradually narrowing towards apex, apical margin arched ( Fig. 3CView FIGURE 3). Ovipositor dark brown, shiny, slender, conspicuously arched, slightly pointed dorsally, with rounded apex ( Fig. 3EView FIGURE 3).

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. 4AView FIGURE 4) and in flooded areas ( Fig. 4BView FIGURE 4).

INPA

Brazil, Amazonas, Manaus, Instituto Nacional de Pesquisas da Amazoonia, Colecao Sistematica da Entomologia

INPA

Instituto Nacional de Pesquisas da Amazonia