Montesinus machadoi, Grossi, Paschoal Coelho, 2016

Grossi, Paschoal Coelho, 2016, A new brachypterous genus of Brazilian stag beetle (Coleoptera: Lucanidae: Lucaninae) with description of three new species, Zootaxa 4078 (1), pp. 218-229 : 228

publication ID	https://doi.org/ 10.11646/zootaxa.4078.1.20
publication LSID	lsid:zoobank.org:pub:836FA2B8-7871-4DED-9646-BD39A4BAA031
DOI	https://doi.org/10.5281/zenodo.6073660
persistent identifier	https://treatment.plazi.org/id/0395E107-FF9F-680D-FF60-FD9F3682F887
treatment provided by	Plazi
scientific name	Montesinus machadoi
status	sp. nov.

Treatment

Montesinus machadoi View in CoL sp. nov.

( Figures 5 View FIGURES 1 – 5 , 21 View FIGURES 18 – 21 , 24–25 View FIGURES 22 – 27 )

Material examined. Holotype female labeled a) “ Brasil, Espírito Santo, Serra do Caparaó, Ibitirama, 2.600m / 10- 12-IV-2012 / M.V.P. Simões col.”.b) “ Montesinus machadoi n. sp. ♀/ HOLOTYPE / P. C. Grossi det. 2015”. Holotype deposited at MNRJ.One paratype female deposited at CERPE and labeled as holotype,except by the yellow paratype label.

Description of female holotype. Total length, 18.0 mm. Total pronotal width 6.9 mm. Color: Body shiny black, except by dark brownish red femora. Mouthparts: Mandibles with dorsal longitudinal furrow distinct and more dorsally visible; internal tooth somewhat forward directed and forming a carina to base, left one broken. Labrum trapezoidal, anteriorly slightly lobed, surface with scattered setose punctures. Mentum transverse, densely punctate; punctures shallow, coarse, and coalescent, each with 1 long setae; setae longer near anterior and lateral sides. Maxillae with a hooklet on apex of galea; lacinial hook slightly backwardly curved ( Fig. 21 View FIGURES 18 – 21 ). Head: Surface almost totally punctate except clypeal area and vertex; punctures large to coarse, never coalescent. Ocular canthi simply rounded, and not expanded. Vertex convex. Gula concave, with scattered C-shaped punctures, tegument reticulate; anterior lateral angles not so projected, rounded. Gena near eyes with coalescent coarse punctures. Prothorax: Surface finely punctate; punctures fine; posterior angles absent; posterior declivity strong. Scutellum: Sides rounded; surface with scattered shallow punctures. Elytra: Surface less irregularly punctate; almost punctures fine; elytral scratches wider, distance from suture and first scratch wider. Humeri truncate, but more projected. Legs: Protibiae with 4 spines, 2 anterior and 2 at middle; second spine wider; distance between 3rd and 4th spines smaller ( Fig. 24 View FIGURES 22 – 27 ). Mesotibiae with 3 spines, the middle one much smaller. Venter: All ventrites finely punctate; punctures fine.

Variation. The other female seems to be a little damaged but some characters are distinct as follows: body wider; posterior angles of pronotum a little more pronounced; anterior tibiae with 5 (left) to 6 spines (right); right mesotibia with four spines, with basal ones larger than those of holotype.

Etymology. The specific name is an homage to another great friend, Dr. Angelo Barbosa Monteiro Machado, one of the great zoologists in Brazil and an Odonata specialist who always helped my research through his donation of stag beetles specimens.

Remarks. Both holotype and paratype have missing tarsi, and were collected alive walking during a cold and rainy day along the track to Pico da Bandeira (Marianna V. P. Simões, pers. comm.). Initially, I believed that these two specimens belonged to one of the other two species, but after dissecting the maxillae, the characters proved to be distinct, so revealing the existence of this new species. It is closer to M. monnei sp. nov. in sharing the same elytral punctures and the shape of maxillae, and the presence of hooklets on it, but differs from this species in the armature of the galea and lacinia. The species can be distinguished by the large size of M. machadoi sp. nov. (similar to that of M. tatula sp. nov.), shape of head, and number of spines on meso and metatibiae.