Piasites perinetensis, Bordera & Santos, 2022

Bordera, Santiago & Santos, Bernardo F., 2022, A review of Piasites Seyrig (Hymenoptera, Ichneumonidae, Cryptinae), with description of seven new species, Journal of Hymenoptera Research 90, pp. 23-57 : 23

Piasites perinetensis sp. nov.

Figs 1D , 8 , 12D , 13E, G , 15A

Diagnosis.

Piasites perinetensis sp. nov. can be distinguished from all other Piasites species by the combination of the following characters: pronotum mostly smooth and shiny, longitudinally strigose punctate at the dorsal lateral part (Figs 8D , 13E ); mesoscutum evenly convex, mostly smooth and shiny (Figs 8C, D , 13E ); metapleuron finely transversally striate (Figs 8D , 13G ); propodeum strongly rugose, posterior transverse carina very weak without forming lateral crests, merging in the central part with the strong rugosities of the propodeum (Fig. 1D ); outer ocular orbit extensively black (Fig. 8D , 13E ); propleuron, pronotum, mesoscutum, coxae and T1-3 orange (Figs 8A, D , 13D, E ). Additionally, female and male have areolet about 0.60 × (Fig. 8E ) and 0.45 × as high as abscissa of vein 2m-cu above bulla, respectively.

Description.

Female. Fore wing length about 5.7 mm.

Head. In dorsal view, moderately narrowed behind eyes and about 0.58 × as long as wide. Gena in dorsal view rounded, strongly swollen. Posterior ocellus separated from eye about 1.6 × its maximum diameter. Distance between posterior ocelli 1.2 × their diameter. Occipital carina complete, evenly curved dorsally. Face smooth and shiny, slightly convex in the central part with very fine setiferous punctures. Clypeal suture present, deeper laterally. Clypeus about 1.9 × as broad as medially long, very convex with relatively long setae in the central part, prominent in lateral view, ventral margin slightly rounded with a median denticle. Malar space about 0.65 × as long as basal mandibular width. Mandible 1.50 × as long as basal width; dorsal tooth distinctly longer than ventral one. Antenna with 27 flagellomeres, strongly tapered towards apex; flagellomeres from f11 to apex conspicuously flattened ventrally; f1 about 7.6 × as long as its maximum width.

Mesosoma. Pronotum predominantly smooth and shiny, with very weak longitudinal striae at the dorsal lateral part, dorsal margin punctate; epomia moderately strong and short, not crossing the anterior depression of pronotum. Mesoscutum 1.20 × as long as wide, evenly convex, predominantly smooth and shiny, with very fine and dense setiferous punctures on median lobe, lateral parts smooth; notaulus deep, reaching about 0.5 length of mesoscutum, without transverse keels. Scutellum with very fine setiferours punctures anteriorly, slightly rugulose punctate posteriorly, lateral carinae strong, reaching 0.7 its anterior length. Mesopleuron predominantly smooth and shiny, with very weak and inconspicuous longitudinal striae dorsally; sternaulus deep, with very small transverse carinae; epicnemial carina weak, reaching the anterior margin of mesopleuron at mid length of pronotum. Metapleuron with weak transverse striation, stronger posteriorly, evanescent anteriorly, finely punctate; juxtacoxal and submetapleural carinae strong and complete. Propodeum strongly rugose; anterior transverse carinae complete, centrally angled towards anterior part; posterior transverse carina very weak without forming conspicuous lateral crests, merging in the central part with the strong rugosities of the propodeum. Hind leg with femur about 6.0 × as long as high. Areolet pentagonal, about 0.80 × as high as wide, relatively small, 0.60 × as high as abscissa of vein 2m-cu above bulla. Hind wing with vein cu-a about 0.35 × length of first abscissa of CU.

Metasoma. T1 about 2.3 × as long as posteriorly broad, granulate, weakly curved dorsally in lateral view, dorso-lateral carina mostly absent, only present at posterior part of postpetiole. T2 about 0.97 × as long as posteriorly broad, finely granulate as the following tergites. Ovipositor sheath about 0.55 × as long as hind tibia.

Colour. Body mostly orange. Head black with face and frons except periphery of antenal sockets, a spot at dorsal part of outer ocular orbit, clypeus, labrum and palpi yellow cream; mandible dark brown; scape, pedicel and f1-3 orange, following flagellomeres dark brown, distal part of f4 to f12, white, f10-12 only dorsally. Mesosoma and legs orange. T1-3 and anterior part of T4 orange, posterior part of T4 and base of T5 brownish black, posterior part of T5 and T6-7 completely white. Wings hyaline, slightly yellowish, pterostigma yellow.

Male. Fore wing length about 6.0 mm. Head. Posterior ocellus separated from eye about 1.2 × its maximum diameter. Distance between hind ocelli 1.2 × maximum diameter of posterior ocellus. Clypeus about 1.85 × as broad as medially long. Malar space about 0.5 × as long as basal mandibular width. Antenna broken, missing from f13; f1 about 5.5 × long as its maximum width. Mesosoma. Pronotum predominantly smooth and shiny, longitudinally strigose punctate at the dorsal lateral part. Areolet about 0.67 × as high as wide, 0.45 × as high as abscissa of vein 2m-cu above bulla. Hind wing with vein cu-a 0.46 × as long as first abscissa of CU. Metasoma. T1 about 3.2 × as long as posteriorly broad. T2 about 1.1 × as long as posteriorly broad. Colour. As female, but white band of antenna beginning on apex of f7. Metasoma with T5 black with posterior white marks. Other features as in female.

Etymology.

The species name refers to the type locality, the Andasibe-Mantadia National Park, previously called Perinet Park.

Material examined.

1 ♀ 1 ♂. Holotype: Madagascar • ♀; Perinet, Forèt Cote Est; Museum Paris; II-39; A Seyrig; MNHN . Paratype: Madagascar • 1♂; Rogez, Foret Cote Est; Museum Paris; IV-38; A Seyrig; MNHN .

Figures

Figure 1. Propodeum of Piasites, dorsal view, females (I): A P. carinatus Seyrig B P. quasimodus sp. nov. (paratype) C P. politus sp. nov. (paratype) D P. perinetensis sp. nov. (holotype). Scale bars: 0.3 mm.

Figure 8. Piasites perinetensis sp. nov., female (holotype): A habitus, lateral view B head, front view C head and mesoscutum, dorsal view D head and mesosoma, lateral view E front wing, areolet and vein 2 m-cu. Scale bars: 1 mm (A); 0.5 mm (C, D); 0.3 mm (B); 0.2 mm (E).

Figure 12. Piasites species, habitus of males, lateral view: A P. carinatus B P. quasimodus sp. nov. (paratype) C P. seyrigi sp. nov. (paratype) D P. perinetensis sp. nov. (paratype) E P. nigricollis sp. nov. (paratype). Scale bars: 1 mm.

Figure 13. Piasites species, males A-E head and mesosoma, lateral view: A P. carinatus B P. quasimodus sp. nov. (paratype) C P. seyrigi sp. nov. (paratype) D P. nigricollis sp. nov. (paratype) E P. perinetensis sp. nov. (paratype) F-G metapleuron: F P. nigricollis sp. nov. (paratype) G P. perinetensis sp. nov. (paratype). Scale bars: 0.5 mm (A-E); 0.2 mm (F, G).

Figure 15. Diagrams showing distribution records for species of Piasites A P. perinetensis sp. nov. B P. politus sp. nov. C P. quasimodus sp. nov. D P. seyrigi sp. nov.