Piasites lineatus, 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 lineatus sp. nov.

Figs 2C , 5 , 14B

Diagnosis.

Piasites lineatus sp. nov. can be distinguished from all other Piasites species by the combination of the following characters: mesoscutum evenly convex, with moderately dense punctures on a shallow granulate background (Fig. 5C, D ); mesopleuron densely and finely strigose punctate in dorsal part, ventrally finely and densely rugose punctate (Fig. 5C ); metapleuron transversely rugulose (Fig. 5C ); juxtacoxal carina strong and complete (Fig. 5C ); propodeum strongly and coarsely rugose (Fig. 2C ); hind coxa black and yellow cream with a fine longitudinal yellow cream stripe at base (Fig. 5E ).

Description.

Female. Fore wing length 6.0-6.5 mm.

Head. In dorsal view, strongly narrowed behind eyes, about 0.5 × as long as wide. Gena in dorsal view weakly rounded, slightly swollen. Posterior ocellus separated from eye 1.1-1.2 × its maximum diameter. Distance between posterior ocelli 1.0 × their diameter. Occipital carina complete, evenly curved dorsally. Face convex centrally, convexity delimited by two weak vertical depressions from antennal sockets to clypeal foveae, with relatively dense punctures. Clypeal suture complete. Clypeus 1.6-1.7 × as broad as medially long, moderately convex, with relatively long setae in the central part, prominent in lateral view, ventral margin slightly rounded without a median denticle. Malar space about 0.5 × as long as basal mandibular width. Mandible 1.50 × as long as basal width; dorsal tooth distinctly longer than ventral one. Antenna with 29-32 flagellomeres, strongly tapered towards apex; flagellomeres from f11 to apex conspicuously flattened ventrally; f1 7.6-7.75 × as long as its maximum width.

Mesosoma. Pronotum longitudinally strigose punctate, rugose punctate dorsally, becoming smooth ventrally; epomia very strong, straight, crossing the anterior depression of pronotum. Mesoscutum 1.10 × as long as wide, evenly convex, with moderately dense punctures on a shallow granulate background; middle part, beetwen posterior end of notauli, strongly rugose; notaulus deep, reaching about 0.7 of length of mesoscutum, without transverse keels. Scutellum coarsely rugose punctate, lateral carinae strong, reaching 0.6 of its anterior length. Mesopleuron densely and finely strigose punctate in dorsal part, ventrally finely and densely rugose punctate; sternaulus deep and wide, without transverse carinae; epicnemial carina very weak, reaching the subtegular ridge. Metapleuron transvesely strigose punctate; juxtacoxal and submetapleural carinae strong and complete. Propodeum strongly and coarsely rugose; anterior transverse carina complete, centrally angled towards anterior part; posterior transverse carina strong and complete evenly curved medially, forming low lateral crests. Hind leg with femur about 5.7 × as long as deep. Areolet pentagonal, 0.6-0.65 × as high as wide, relatively small, about 0.5 × as high as abscissa of vein 2m-cu above bulla. Hind wing with vein cu-a about 0.5 × length of first abscissa of CU.

Metasoma. T1 2.7-2.85 × as long as posteriorly broad, granulate, weakly curved dorsally in lateral view, dorso-lateral carina weak, present anteriorly and posteriorly. T2 0.75-0.8 × as long as posteriorly broad, finely granulate as the following tergites. Ovipositor sheath about 0.5 × as long as hind tibia.

Colour. Body mostly orange. Head brownish black with facial orbits, frons (except periphery of antennal sockets), outer ocular orbits, malar space, clypeus, labrum, mandible except teeth, and palpi, yellow cream; scape, pedicel and f1-3 orange, following flagellomeres dark brown, f5-9 white dorsally. Mesosoma with a yellow cream spot on ventral corner of pronotum; subtegular ridge and hind corner of metapleuron, propleuron, anterior part of pronotum and ventral part of mesothorax, black. Legs with anterior and mid coxae and trochanters yellow cream, hind coxa black with inner part and apex, and a longitudinal dorsal narrow stripe at base, trochanter and base of trochantellus, yellow cream; distal part of trochantellus black; all tarsi infuscate. T2 dark orange anteriorly, brownish black posteriorly; T3, anterior part of T4 and T5 black, posterior part of T4, T5 and following tergites yellow cream. Wings hyaline, slightly yellowish, pterostigma brown.

Male. Unknown.

Etymology.

From the Latin linea, meaning “line”, in reference to the whitish longitudinal stripe on the hind coxa.

Material examined.

2 ♀♀. Holotype: Madagascar • ♀; Ambositra; Museum Paris; XI-36; A. Seyrig; MNHN . Paratypes: Madagascar • 1♀; Fianarantsoa, Plateau Central; XI-36; A. Seyrig; MNHN .

Figures

Figure 2. Propodeum of Piasites, dorsal view, females (II): A P. nigricollis sp. nov. (holotype) B P. orbitalis sp. nov. (holotype) C P. lineatus sp. nov. (paratype) D P. seyrigi sp. nov. (paratype). Scale bars: 0.3 mm.

Figure 5. Piasites lineatus sp. nov., female: A habitus, lateral view (holotype) B head, front view (holotype) C head and mesosoma, lateral view (holotype) D head and mesoscutum, dorsal view (holotype) E metasoma, dorsal view, arrow shows yellow cream dorsal stripe on hind coxa (paratype) F front wing, areolet and vein 2 m-cu (paratype). Scale bars: 1 mm (A, E); 0.5 mm (C); 0.3 mm (B, D, F).

Figure 14. Diagrams showing distribution records for species of Piasites A P. carinatus B P. lineatus sp. nov. C P. nigricollis sp. nov. D P. orbitalis sp. nov.