Leptogenys bohlsi Emery, 1896

Tozetto, Leonardo, Chaul, Júlio C. M., Lattke, John E. & Boudinot, Brendon E., 2022, Review of the Leptogenys unistimulosa species group (Hymenoptera: Formicidae) with the description of a new Amazonian species, Revista Brasileira de Entomologia (e 20220045) 66 (3), pp. 1-17 : 5-7

Leptogenys bohlsi Emery, 1896

( Figures 3 and 11A )

Male diagnosis

Uniquely identified among the unistimulosa species complex by the following conditions: (1) Body size not very large (WL <3.00 mm); (2) ocelli small, with the distance between compound eye and lateral ocellus in full face view somewhat more than two times longer than median or lateral ocellus width; (3) ocelli close to but not surpassing posterior head margin in full face view; (4) compound eyes not enlarged, with the distance between them about equal to one eye length in full-face view; (5) scape no more than two times pedicel length and about the same length as clypeal length; (6) mesoscutum about as long as broad; (7) mesoscutum largely smooth; (8) vein M+Cu-f1 reduced; (9) 2r-rs shorter than Rs-f4; (10) petiolar node without bulge anterad of posterodorsal corner; (11) abdominal sternites AIII–VIII (gastral I–VI) sparsely pilose, without appearance of dense shaggy pads. The “small” ocelli and compound eyes are the most conspicuous combination diagnosing this species (chars 2–4).

Male measurements

EL 0.61–0.68; OL 0.13–0.14; OES 0.24–0.25; CML 0.37–0.43; ML 0.38; SL 0.38–0.45; HL 1.03–1.18 HW 1.12–1.22; MeL 1.06–1.16; MeW 1.00–1.01; WL 2.33–2.62; PetW 0.43–0.55; PetH 0.81–0.90; PetL 0.65–0.75; OI 54.5–55.7; MI 31.1–33.9; SI 34.2–36.9; CI 103.4–108.7; DPI 66.7–73.3; LPI 120.0–123.8; (n = 2).

Head longer than wide in full face view, with width measured just posterad of compound eyes. Mandible slightly shorter than antennal scape, rounded apically, edentate, dorsal surface smooth and shining. Clypeus anterolateral margin straight with thin lamella, apex truncate. Frontal carina reduced.Scape not more than 2x pedicel length and about same length as clypeal length. Pedicel longer than wide.Compound eyes grossly enlarged; tracing a horizontal line at maximum eye width in full-face view, face (= “frons”) width is about 3 x the maximum width of eye.Ocelli equal in size, not protruding beyond posterior head border with head in full-face view; distance between compound eye and lateral ocellus greater than two lateral ocellar diameters. Sculpture: cuticle of head capsule weakly punctate.

Mesosoma with dorsal profile in lateral view broadly convex; pronotum in dorsal view punctate laterally and smooth medially. Mesoscutum in dorsal view slightly longer than wide, sparsely punctate. Notauli strongly impressed, scrobiculate, and meeting medially, thus Y-shaped.Parapsidal lines impressed about half of mesoscutal length. Mesoscutellar disc with longitudinal striae.Upper mesopleural region (= anepisternum) punctate with oblique striae. Longitudinal mesopleural sulcus scrobiculate.Lower mesopleural region (= katepisternum) punctate. Propodeum with dorsal profile in lateral view weakly convex, separated from declivity by blunt angle. Sculpture: propodeum and metapleural area (= metapleuron) rugulose, declivity shining and with few carinae.

Wings. Vein C in fore wing present. Abscissa R-f3 present, running toward distal wing margin and enclosing radial (= marginal cell) with Rs-f5. Abscissae Rs-f2-3 present, connecting with Rs+M and M-f2 proximally. Crossvein 2r-rs present and about the same length as Rs-f4, and differentiated from Rs-f4 by presence of Rs-f2-3. Abscissae Rs-f4-5 differentiated into Rs-f4 and Rs-f5 by the presence of 2rs-m. Abscissa M-f 2 in fore wing present. Abscissa M-f4 almost reaching wing margin. Crossvein 1m-cu present. Vein Cu in fore wing present, M+Cu-f1 reduced.Vein A with abscissae A-f2 and A-f2 present; crossvein 1cu-a slightly prefurcal, i.e., Cu+M splitting just distad the crossvein. Vein C in hind wing absent. Vein Sc+R, M+Cu, Cu in hind wing present. Abscissa Rs-f 1 in hind wing present, shorter than 1rs-m. Abscissa Rs-f 2 in hind wing present, sometimes almost reaching wing margin. Abscissa M-f1 and M-f 2 in hind wing present. Crossvein cu-a in hind wing present. Vein A in hind wing with abscissae A-f1 and A-f2 present.

Metasoma. Petiole subtriangular to trapezoid in lateral view, anterior profile straight merging with convex summit, node highest posteriorly, posterior margin abruptly vertical. Subpetiolar process rounded; in dorsal view, petiole longer than broad, lateral margins converging anteriorly; lateral surface mostly rugose, posterior face smooth.Cinctus well-marked, gaster mostly smooth with sparse punctulae.Abdominal sternum IX posteriorly rounded.

Setation. Head with long, erect hairs and fine decumbent hairs; clypeus with fine subdecumbent hairs; antenna with fine decumbent hairs and some stout short, suberect hairs. Mesosoma, petiole, and gaster covered with some long erect hairs.

Color. Body black to brown; clypeus, antenna, legs, and gaster ferruginous brownish; petiole ferruginous ventrally and dark brown dorsally.

Comments

The Leptogenys bohlsi male is associated with a worker; both ants were glued on their sides on the same cardstock. The male appears to have lost some or most of its pilosity. According to Borgmeier’s catalogue it was collected in 25.ii.33 [1933] Campinas, Goiás (Ulyssea, M. personal communication, July 2022). Although L. bohlsi workers can be similar to L. unistimulosa ( Lattke, 2011) , the males can be easily differentiated. Even though L. bohlsi males are also smaller in size than L. unistimulosa males, the compound eyes are more widely spaced in L. bohlsi and not as bulging as in L. unistimulosa ; the face (= frons) in L. bohlsi is at least three times wider than the eye maximum width in full-face view. The ocelli are smaller in L. bohlsi , with the distance between the lateral ocellus and eye greater than the maximum diameter of the median ocellus, but this varies among L. unistimulosa males. The scape in L. bohlsi is shorter than the clypeal length, while it is longer in L. unistimulosa .

Material studied

Brazil. Goiás: Campinas, Schwarzmaier, Nr 5512 Coll.Borgm., 1 worker and 1 male, [ MZSP] . Maranhão: Mirador, Geraldina, 05.xii.2009, Mata de Galeria , Ponto de M.10, 1 male DZUP 550887 , [ DZUP] . Mato Grosso: Poconé, Pantanal, Faz. São Sebastião de Borba , 16°15’24”S 56°37’22” W, X.2016, L. Pavão, col., antes do fogo, AL 10 T4 P40, 1 worker DZUP 550888 , [ DZUP] .

Figures

Figure 3. Leptogenys bohlsi male, 5512 Coll. Borgmeier:(A) full-face, (B) lateral, mesosoma in (C) profile and (D) dorsal views, (E) fore wing, and (F) hind wing.

Figure 11. Figure 11. Distribution maps. (A) L. bohlsi; (B) L. elzasoares; (C) L. parensis; (D) L. unistimulosa, Miranda et al. (2012), Salazar & Donoso (2013), Gomes et al. (2014), Miranda et al.(2017), Santos et al. (2017), Fernandes & Souza (2018), Prado et al. (2019), Nascimento et al.(2020). Red circles:type locality; White circles:material studied; Black circles: material studied by Lattke (2011), Black triangles: records not examined from literature after 2011.