Gnamptogenys piei, Dias & Lattke, 2019

Dias, Amanda M. & Lattke, John E., 2019, A new species and new records of minuta - group Gnamptogenys from Brazil (Hymenoptera: Formicidae), Revista Brasileira de Entomologia 63 (1), pp. 30-34 : 31-32

Gnamptogenys piei n. sp.

( Fig. 1 )

Diagnosis. Mesosomal dorsum mostly longitudinally costulate; anterior margin of clypeus with weak median lobe, clypeal lamella absent; metanotal groove absent; propodeum armed with small, distinct tooth; foretarsal base with seta opposite protibial spur; dorsum of petiole with concentric rugulae; meso- and metatibiae with one apical spur each.

Description. Holotype measurements: HL 0.93; HW 0.84; SL 0.75; ED 0.13; WL 1.05; PL 0.43; CI 91; OI 16; SI 89. Head subquadrate in full-face view; posterior cephalic margin mostly straight with slight median concavity, lateral margin broadly convex. Eye convex, placed just anterad of cephalic mid-length; ommatidia relatively large, 7 ommatidia present along greatest diameter. Malar area with arched longitudinal carina extending from anterior clypeal margin to mid-distance between eye. Clypeal disk, frontal lobe, cephalic dorsum, and vertex with slightly sinuous longitudinal costulae; head punctate-rugulose laterally. Frontal lobe in full-face view expanded anterad, completely covering antennal insertion. Mandible triangular and elongate, dorsum longitudinally rugulose-punctate and shining, basal angle shaped as broad, blunt triangle; masticatory margin broadly concave with two preapical blunt teeth, largest situated close to mandibular mid-length and shortest closer to basal angle, some inconspicuous denticles found just apicad of large tooth. Anterior margin of clypeus broadly convex, with weak median lobe, lamella absent; clypeal disk surface relatively flat. Surface level of both clypeal disk and most of frons interrupted by brief, depressed area between frontallobes. Posteriorclypealmargin atmid-lengthoffrontallobes shaped as obtuse angle posteriorly bordered by narrow parallel strip that slopes ventrally, defining anterior margin of depressed area. This area gradually slopes dorsad until reaching predominant dorsal frons surface level just posterior to frontal lobes. Antennal scape surpasses posterior cephalic margin by less than one-fifth its length, shining, densely punctulate and densely covered by suberect whitish hairs. Cephalic ventrum with longitudinal to oblique rugulose costulae that diverge posteriorly. Palps not visible.

Mesosomal dorsal margin in profile forming single broad convexity; promesonotal suture and metanotal sulcus not impressed, mesosomal dorsum longitudinally costulate medi- ally and rugulose-costulate laterally. Anterior pronotal surface with 6 transverse rugulose costulae; lateral pronotum with low but distinct rugulose costae, progressively becoming smooth posterad; anepisternum smooth and katepisternum smooth with somelongitudinal striae; mesometapleural suture well-impressed; metapleuron mostly smooth and shining, with transverse striae close to bulla. Metapleural gland opening forms transverse slit. Propodeal spiracle round, elevated on broadly conical tumulus, surrounded by light brown ring; distance between spiracle and posterior margin of propodeum is approximately 3 spiracular openings. Propodeal denticle low but distinct. Propodeal declivity shining with lateral and dorsal rugosities and median oval smooth area. Coxae with transverse striae, protarsal base opposite spur with prominent seta and row of smaller setae; femora and tibiae punctulate; meso- and metatibiae with one apical spur each and no apical setae. Metacoxal dorsum with low, posterobasal denticle. Claws with preapical tooth.

Petiolar node rugulose-costulate to rugulose-punctate; anterior and dorsal margins in lateral view convex and continuous; posterior margin vertically straight; node with concentric rugulosities in dorsal view, subpetiolar process subquadrate, anteriorly rounded, posteriorly shaped as short, blunt tooth. Petiolar spiracle within round depression. Ventral margin of abdominal sternite III in lateral view mostly broadly convex with slight concavity at prora; length of anterior margin of tergite III in lateral view approximately one-third that of dorsal margin, dorsal margin straight to weakly convex. Abdominal segment IV arches posteroventrally with long and convex dorsal margin in lateral view and extremely short ventral margin, apex of segment faces ventrally; rest of abdominal segments mostly recessed. Abdominal tergite III laterally with scattered shallow piligerous punctae, dorsomedially with longitudinal costulae, progressively rugulose to punctate laterally. Abdominal tergite IV mostly longitudinally costulate, sternite roughly rugulose-punctate. Body mostly ferruginous, legs orange, antenna and mandible ferruginous brown; body with abundant white, decumbent hairs.

Type material. Holotype. Brazil: Riode Janeiro: Parque Nacional Itatiaia, −22.4116, −44.6386, 1991 m, 20.I.2015, Lasmar et al. col. One point-mounted worker deposited in DZUP with the unique identifier DZUP 548816 . Collected as part of Projeto Altitudinal Mata Atlântica – Transecto 6A, Winkler extractor, Ponto 1 .

Etymology. This species is named in honor of Dr. Marcio Pie, professor of the Universidade Federal do Paraná, PR, Brazil, for his contributions in science, especially in myrmecology.

Figures

Fig. 1. Gnamptogenys piei n. sp. Holotype. (A) Dorsal view of head; (B) lateral view of body; (C) dorsal view of body.