Pelecium igneus Orsetti & Lopes-Andrade

Orsetti, Artur & Lopes-Andrade, Cristiano, 2016, A new species of Pelecium Kirby (Coleoptera: Carabidae: Peleciini) from the Atlantic Forest biome, Brazil, Zootaxa 4179 (1), pp. 123-127 : 124

publication ID

https://doi.org/10.11646/zootaxa.4179.1.9

publication LSID

lsid:zoobank.org:pub:2DC877EE-6CCF-44D0-9240-37B3184F75AD

DOI

https://doi.org/10.5281/zenodo.6087630

persistent identifier

https://treatment.plazi.org/id/03B387D9-FF9A-FF9B-98EC-71F0FA34A91D

treatment provided by

Plazi

scientific name

Pelecium igneus Orsetti & Lopes-Andrade
status

sp. nov.

Pelecium igneus Orsetti & Lopes-Andrade , sp. nov.

Figs 1−12 View FIGURES 1 – 4 View FIGURES 5 – 12

Type locality. “ Estação de Pesquisa, Treinamento e Educação Ambiental Mata do Paraíso ” (officially abbreviated as “ EPTEA Mata do Paraíso ”) in Viçosa, state of Minas Gerais, Southeast Brazil (20°48'08.0"S 42°51'21.7"W). GoogleMaps

Etymology. The specific epithet is from the Latin “ igneus ”, which means “on fire”, in reference to the reddish reflexes on pronotum and head.

Diagnosis. A medium sized species (13 mm) distinguishable among other congeners by the combination of the following features: Fore body dorsum is bright metallic and thence contrasts sharply with the black elytra ( Fig. 1 View FIGURES 1 – 4 ). Head with frontal impressions punctiform ( Figs 1, 3 View FIGURES 1 – 4 ), with a short and shallow excavation. Pronotum with median line shallow ( Fig. 1 View FIGURES 1 – 4 ), barely discernible, deeper posteriorly; basal impressions very shallow. Apical labial and maxillary palpomeres triangular ( Fig. 4 View FIGURES 1 – 4 ). Adults of P. i gn e us and P. helenae are quite similar in the shape of the body, frontal fovea of head, median line and basal impressions of pronotum. However, in P. igneus the lateral edges of pronotum are more arcuate near base, giving it a subcordate shape when seen from above. Moreover, in P. igneus the elytra is comparatively rounder when seen from above and is shiny black, contrasting with its metallic reddish pronotum. In P. helenae , the dorsum is homogeneously violaceus.

Description, male holotype ( Figs 1–12 View FIGURES 1 – 4 View FIGURES 5 – 12 ). Fully pigmented adult. Measurements in mm: AL1-11: 0.81, 0.48, 0.55, 0.52, 0.56, 0.50, 0.44, 0.45, 0.43, 0.45, 0.65, EL 6.89, EW 5.18, lp2L 0.57, lp3L 0.83, lp3 W 0.51, mp3L 0.24, mp4L 0.68, mp4 W 0.46, PL 3.85, PW 3.83, SL 0.49, SW 0.67, TL 12.85. Ratio: TL/EW 2.48. Body ovate and flat; discs of head and pronotum metallic wine reddish in dorsal view, with greenish and yellowish reflections along sides ( Fig. 1 View FIGURES 1 – 4 ); elytra shiny black ( Fig. 1 View FIGURES 1 – 4 ), glabrous, with only standard setae present (supraorbital, pronotal and parascutellar setae); ventral surface shiny black ( Fig. 2 View FIGURES 1 – 4 ), Head microreticulate, with a pair of frontal punctiform fovea, each with a short and shallow excavation at the outer side ( Fig. 3 View FIGURES 1 – 4 , arrows). Mouth parts ( Fig. 4 View FIGURES 1 – 4 ): apical labial and maxillary palpomeres triangular, with long and sparse yellowish setae, surface mostly reddish brown, with apicalmost portion yellowish; fourth maxillary palpomere subtriangular, 2.8X as long as the third palpomere, covered with sparse yellowish slender setae, surface reddish brown, with apicalmost portion yellowish. Pronotum ( Fig. 1 View FIGURES 1 – 4 ) subcordate, minutely rough (in low magnification) to transversely microstriate (in magnification above 100X); lateral margins rounded in apical 4/5, sinuate just in front of basal angles; base truncate, with sides strongly oblique towards highly obtuse and blunt basal angles; median line fine and shallow, deeper posteriorly; basal impressions inconspicuous. Scutellum triangular ( Fig. 1 View FIGURES 1 – 4 ), minutely rough (in low magnification) to microreticulate (in magnification above 100X). Elytra with inner five interneurs deep; in between interneurs shiny and unpunctate, minutely rough (in low magnification) to transversely microstriate (in magnification above 100X). Protibiae ( Fig. 2 View FIGURES 1 – 4 ) expanded at apex. Mesotibiae ( Fig. 2 View FIGURES 1 – 4 ) not expanded at apex; densely pubescent ventrally, more ventroapically. Metatibiae ( Fig. 2 View FIGURES 1 – 4 ) slender, densely pubescent in apical half of ventral side. Abdominal tergite IX ( Fig. 12 View FIGURES 5 – 12 ) oval, asymmetric, with anterior portion narrowed to a sharp apex; posterior portion with asymmetric expansions on each side; posterior edge barely curved and growing to an obtuse angle. Aedeagus ( Figs 5−11 View FIGURES 5 – 12 ) with penis ( Figs 5−9 View FIGURES 5 – 12 ) cylindrical, slender, conspicuously curved in lateral views ( Figs 6, 8, 9 View FIGURES 5 – 12 ), its apical edge straight ( Figs 5, 7 View FIGURES 5 – 12 ); parameres asymmetric ( Figs 7, 10−11 View FIGURES 5 – 12 ), left paramere ( Fig. 10 View FIGURES 5 – 12 ) longer and narrower than right paramere ( Fig. 11 View FIGURES 5 – 12 ).

Type series. Holotype ♂ ( CELC), labeled “ BRASIL: MG, Viçosa Mata do Paraíso , 08.xii.2014 pitfall, trilha do pesquisador leg. A. Orsetti \ Pelecium igneus Orsetti & Lopes-Andrade HOLOTYPUS [printed in red paper]”.

Comments. The sexsetose labrum, combined with quadrisetose pronotum, defines Pelecium igneus as a member of the subgenus Pelecium (s. str). Pelecium igneus is the unique species in the genus in which the color of head and pronotum is different from the color of elytra. We include P. i g ne u s in P. rotundipenne species group based on the following features: head frontal fovea punctiform, pronotum basal impression moderately deep to shallow, elytral interneurs 6 and 7 absent, interneurs 5 absent or reduced ( Straneo & Ball 1989). It is necessary to alter part of the definition of the P. rotundipenne group, which now includes species with black colored, coppery, violaceus and partially reddish dorsum.

Pelecium igneus sp. nov. can be identified using key in Straneo & Ball (1989), with couplets 25 and 26 modified in the following way:

25(24’) Elytron with only discal interneurs 1–4 deep, and only interneur 1 extended to apical declivity, 4 remote from base and apex. Pronotum with posterolatera1 impressions indistinct, shallow. ............................................................................. P. purpureum 25'. Elytron with at least interneurs 1–5 moderately deeply impressed, and extended to rather gradually sloped apical declivity. Pronotum with posterolateral impressions various. ............................................................................................................... 25a 25a(25’) Pronotum with sides markedly rounded; posterolateral impressions evident. ............................................................. P. paulae 25a’ Pronotum with sides less rounded, subsinuate to sinuate posteriorly; posterolateral impressions indistinct. ......................... 26 26(25a’) Pronotum reddish, with green reflections laterally. Elytra black, with violaceous reflections. ......................... P. igneus sp. n. 26’ Dorsum unicolored dark purplish, without green reflections laterally. ...................................................................... P. helenae

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Carabidae

Genus

Pelecium