Pirhosigma sulcata Ferreira & Hermes

Ferreira, Wellington D., Grandinete, Yuri C., Lopes, Rogério B. & Hermes, Marcel G., 2015, A new contribution to the knowledge of Neotropical Eumeninae (Hymenoptera, Vespidae), Zootaxa 3981 (1), pp. 117-124 : 118-119

Pirhosigma sulcata Ferreira & Hermes , sp. nov.

( Figs 1–4 , 12–14 )

Diagnosis. Pirhosigma sulcata differs from congeners by the following combination of features: male antennae with a reduced, triangular apical flagellomere, directed backwards above F9–10; pronotal carina developed along its entire dorsal margin; T1 with basal petiole extending further half of the tergum length; T2 without a basal dorsal hump; metasomal S2 smoothly convex. The species runs to couplet four of Giordani Soika´s (1978) key, better fitting P. mearimense ( Zavattari, 1912) ( Fig. 5 ) but differing from it by: (i) the medially shorter dorsal pronotal surface (compare Figs 2 and 6 ); (ii) the thick and well developed lamellar posterior margin of the pronotum (compare Figs 2 and 6 ); (iii) the pointed apex of parategulae (rounded in P. m e a r i m e n s e) (compare Figs 2 and 6 ); (iv) the slightly more laterally prominent mesepisternum (compare Figs 3 and 7 ); (v) the conspicuous sulcus between scutellum and metanotum (compare Figs 4 and 8 ); and (vi) the denser and longer pilosity on the lower portion of the propodeum (compare Figs 4 and 8 ).

Description. Holotype male. Body ground color black, with somewhat sparse brownish and yellow markings. Antennae predominantly brownish to black, except by yellow inner face of pedicel and apical flagellomeres. Yellow markings as follows: two lateral stripes on clypeus; quadrangular inter-antennal mark; stripes on inner orbits of compound eyes; narrow stripes on upper outer orbit of compound eyes; apical band on T1, interrupted medially; T2–6 and S2–6 with apical bands. Parategulae pale-yellow. Mid-legs yellowish. Lateral marks on dorsal surface of pronotum and hind legs brownish. Wings dark-brownish, venation blackish.

Clypeus longer than wide, with apex emarginate; F11 triangular, directed backwards above F10; inter-antennal region smooth; inner margin of antennal sockets with slightly developed carinae; pronotal carina well developed all along, laterally slightly sinuous; dorsal pronotal surface small medially, with mesoscutum almost reaching pronotal carina; posterior margin of pronotum well developed, somewhat lamellar; mesepisternum laterally prominent; outer rim of tegulae with slight lamella more developed posteriorly; parategulae narrow, slender; scutellum in profile slightly more raised than mesoscutum; sulcus between scutellum and metanotum evident; T1 longer than wide, with petiole extending further half of the total length of the tergum; pre-apical fossa of T1 developed, oval; T1 with lateral longitudinal carina; T2 wider than long. Genitalia as in Figs. 12−14 .

Clypeus with large, shallow and sparse macropunctures, with distance among them larger than one puncture diameter, and evident micropunctures; frons with conspicuous, larger and denser punctation than the clypeus; pronotum, mesoscutum, scutellum, metanotum and propodeum coarsely punctate, and background micropunctation; upper mesepisternum coarsely punctate, with space between punctures becoming larger and micropunctures evident downwards; T1 with denser macropunctation towards apex, and background micropunctation; T2 with basal conspicuous macropunctation, denser than that of T1.

Pubescence conspicuous, with abundant whitish pilosity as follows: clypeus, frons, lower surface of mesepisternum near coxae, propodeum, T2–6 and S2–6. Sparse, shorter, erect and brownish pilosity on pronotum, mesoscutum, scutellum and metanotum. Sparse and thin pilosity on lateral base of T1, denser on apex. Denser, longer whitish pilosity on lower lateral propodeum and on metasomal terga and sterna.

Female unknown.

Type material. Holotype, ♂, Brazil: ‘KM31 AM-010/ CEPLAC AM-BR/ 18-VI-76 / Joselita M. Santos’ (handwriten label) [ INPA].

Distribution. Brazil (Amazonas).

Etymology. The specific epithet refers to one of the diagnostic features of this species: the conspicuous sulcus between the scutellum and the metanotum.

Additional examined material: Pirhosigma mearimense ( Zavattari, 1912) , Brazil, Mearim: holotype, ♂ ( MSNG), ‘Coll. Gribodo\ Miarim\ D’ (partially handwriten label) ‘ HOLOTYPUS \ Eumenes \ mearimensis\ Zavattari, 1912 ’ (partially handwritten label) ‘ Eumenes \ mearimensis\ ♂ Zav.\ E. Zavattari, det.’ (partially handwriten label) ‘Museo Civico\ di Genova’ ‘Typus’ (in the back of the label).

Figures

FIGURES 1 − 4. Pirhosigma sulcata, holotype, ♂. 1. Habitus; 2. Mesosoma, dorsal view; 3. Mesepisternum, oblique posterior view; 4. Mesosoma, posterior view. Scale bar 1 mm for Fig. 1 and 0,5 mm for Figs 2 − 4.

FIGURES 12 − 17. Male genitalia. 12 − 14. Pirhosigma sulcata. 12. Aedeagus, lateral view; 13. Aedeagus, ventral view; 14. Gonocoxite and volsella. 15 − 17. Pararhaphidoglossa gibbiventris. 15. Aedeagus, lateral view; 16. Aedeagus, ventral view; 17. Gonocoxite and volsella. Scale bar 0,5 mm.

FIGURES 5 − 8. Pirhosigma mearimense, holotype, ♂. 5. Habitus; 6. Mesosoma, dorsal view; 7. Mesepisternum, oblique posterior view; 8. Mesosoma, posterior view. Scale bar 2 mm for Fig. 1 and, 0,5 mm for Figs 2 − 4.