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

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

publication LSID

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

persistent identifier

http://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 1−12View FIGURES 1 – 4View 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. 1View FIGURES 1 – 4). Head with frontal impressions punctiform ( Figs 1, 3View FIGURES 1 – 4), with a short and shallow excavation. Pronotum with median line shallow ( Fig. 1View FIGURES 1 – 4), barely discernible, deeper posteriorly; basal impressions very shallow. Apical labial and maxillary palpomeres triangular ( Fig. 4View 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 1–12View FIGURES 1 – 4View 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. 1View FIGURES 1 – 4); elytra shiny black ( Fig. 1View FIGURES 1 – 4), glabrous, with only standard setae present (supraorbital, pronotal and parascutellar setae); ventral surface shiny black ( Fig. 2View FIGURES 1 – 4), Head microreticulate, with a pair of frontal punctiform fovea, each with a short and shallow excavation at the outer side ( Fig. 3View FIGURES 1 – 4, arrows). Mouth parts ( Fig. 4View 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. 1View 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. 1View 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. 2View FIGURES 1 – 4) expanded at apex. Mesotibiae ( Fig. 2View FIGURES 1 – 4) not expanded at apex; densely pubescent ventrally, more ventroapically. Metatibiae ( Fig. 2View FIGURES 1 – 4) slender, densely pubescent in apical half of ventral side. Abdominal tergite IX ( Fig. 12View 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 5−11View FIGURES 5 – 12) with penis ( Figs 5−9View FIGURES 5 – 12) cylindrical, slender, conspicuously curved in lateral views ( Figs 6, 8, 9View FIGURES 5 – 12), its apical edge straight ( Figs 5, 7View FIGURES 5 – 12); parameres asymmetric ( Figs 7, 10−11View FIGURES 5 – 12), left paramere ( Fig. 10View FIGURES 5 – 12) longer and narrower than right paramere ( Fig. 11View 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