Plumarius angulatus Diez & Roig-Alsina

Diez, Patricia A. & Roig-Alsina, Arturo, 2016, Revision of Plumarius Philippi 1873 (Hymenoptera: Chrysidoidea, Plumariidae) from Argentina north of Patagonia, with description of eighteen new species, Zootaxa 4098 (3), pp. 442-470 : 450-451

Plumarius angulatus Diez & Roig-Alsina , sp. nov.

( Figs 5 A–D)

Diagnosis. This species, together with P. globulosus sp. nov., are the only two Plumarius species with a longitudinal, median carina on T7. It is easily distinguished from P. globulosus by the flat clypeus.

Description. Holotype, ♂. Body length 7.9 mm (paratypes 8.9–9.8 mm). Color. Brown, with head (except clypeus) and stigma darker.

Head. 1.1 × wider than high in frontal view; wider in dorsal view than width of scutum between tegulae (5.8:5.5). OOD 1.0 × diameter of lateral ocellus; POD 1.4 × OOD. Antennocular distance 0.6 × diameter of torulus; interantennal distance 3.1 × antennocular distance. Vertex reticulated, without striae but densely punctate between lateral ocelli (punctures separated by 0.5 × puncture diameter). Torulus closer to lateral ocellus than to clypeus (1.2:2.0). Lateral ocelli in frontal view below upper margin of head. Median ocellus crossed by supra-torular line ( Fig. 5 A). Genal carina absent. Length of area between preoccipital carina and suboral swelling subequal to suboral swelling (1.0:0.9); this area without a median longitudinal carina; lower area of genal bridge close to mandibular articulation without carinae or punctures ( Fig. 5 B). Malar area shorter than apical width of F1 (0.6:1.1), striate anteriorly. Supraclypeal area with lateral striae; in lateral view with protuberant ( Fig. 5 C). Epistomal suture evident. Clypeus 1.3 × wider than high, with weak striae; weakly rounded in lateral view; apex not truncate. Proportion of lengths of segments of maxillary palp, from base to apex: 11:6.0:14:18:14:16. Scape without swelling or projection. F1 4.3 × as long as its apical width, shorter then scape and pedicel combined (4.4:4.8).

Mesosoma . Area anterior to pronotal lobe smooth; pronotal lateral carina distinct, forming weak lower pocket. Notaulus weakly marked, as long as admedian line. Anterior surface of scutum densely punctate. Propleuron and mesopleuron densely punctate. Metapostnotum with longitudinal striae, reaching to posterior margin. Propodeum transverse, swollen behind spiracle; with carina anterior to spiracle. Fore wing: marginal cell with anterior margin 2.8 × as long as posterior margin; vein Rs3 shorter than length of Rs4 (2.5:3.0); vein M separated from vein cu-a by 0.4 × length of cu-a; discal cell rectangular. Hind wing: veins M and cu-a interstitial. Protarsomere 1 with five outer lateral spines. Length of mesotarsomere 1 shorter than metatarsomere 1 (5.8:8.8); inner metatibial spur 1.4 × as long as outer spur.

Metasoma. T7 with median, longitudinal carina. Genitalia as in Fig. 5 D.

Examined material. Holotype, ♂: ARGENTINA, Mendoza, Lavalle, Telteca, 26.III–2.V.1996, col Flores, Roig (IADIZA). Paratypes: 1 ♂, Ñacuñán, 7.X.1996, col Roig S. ( IFML); 2 ♂, Santa Rosa, Ñacuñán, I–II.1997, col Debandi ( MACN).

Distribution. Argentina (Mendoza).

Etymology. The specific epithet, the Latin adjective angulatus , refers to the median, longitudinal carina, on T7.

Figures

FIGURE 5. Plumarius angulatus sp. nov., ♂. A, Head, frontal view; B, Head, ventral view; C, Head, lateral view; D, Genital capsule, ventral view. Scale bars = 0.5 mm.