Physotarsus mishanensis Reshchikov and Sääksjärvi, 2015

Reshchikov, Alexey & Sääksjärvi, Ilari Eerikki, 2015, Seven new species of the genus Physotarsus Townes 1966 (Hymenoptera, Ichneumonidae) from South America, Zootaxa 3972 (1) : -

Physotarsus mishanensis Reshchikov and Sääksjärvi sp. nov.

Figs 4–8 .

Diagnosis. Physotarsus mishanensis Reshchikov and Sääksjärvi sp. n. can be distinguished from all other described species of Physotarsus by the combination of the following characters: 1) face and propodeum entirely yellow ( Figs 5, 8 ), 2) fore wing hyaline at base ( Fig. 4 ), 3) epicnemial carina parallel to anterior margin of mesopleuron, 4) ventral clypeal margin with a prominent angulate central lobe ( Fig. 5 ).

This species is most similar to P. claviger and P. bonillai in body sculpture, form of the clypeal margin, and coloration of fore wing. The head and body of P. mishanensis have dark marks ( Fig. 6 ) whereas P. bonillai has no dark markings on the head and P. claviger has extensive dark markings on propodeum.

Description. Female. Body length 4 mm. Antennae with 22–26 flagellomeres each. Scape 0.6 times as broad as long ( Fig. 5 ). Head narrowed behind eyes ( Fig. 6 ), shining. Maximum length of temple 0.65 transverse eye diameter; minimum length of temple 0.65 times transverse eye diameter. Face width equal of longitudinal eye diameter. Face convex, with bulge, smooth and shining ( Fig. 5 ). Interantennal area moderately convex. Interantennal distance greater than distance between lateral ocelli. Lateral ocelli separated by 1 times their widest diameter from each other and 1.4 times their widest diameter from eye margin. Area between lateral ocelli moderately flat, area behind ocelli sharply declivitous and convex. Clypeus separated from face by impression; clypeal margin widely subtruncate laterally, with thick, rounded central lobe. Clypeus about 5 times as broad as long, not divided medially by transverse depression. Face covered with white setae. Clypeal foveae small with outgoing grooves till eyes margins. Malar space as wide as basal mandible width. Occipital carina present laterally. Lower mandible teeth little longer than upper.

Mesosoma smooth, shining, without punctures. Lateral groove of pronotum distinct. Pronotum smooth, impunctate, shiny. Mesoscutum shiny, impunctate and smooth. Notaulus not impressed. Epicnemial carina reach anterior margin of mesopleuron. Mesopleuron impunctate, shiny. Lower part of mesopleuron and metapleuron pubescent. Tarsal claws elongate, not pectinate. Hind tarsi slightly thick, its length to hind tibiae length ratio 1.13; each article of hind tarsi length ratio 30:10:8:5:7. Fore wing stigma about 3.5x longer than wide. Radius intercepted stigma before its middle. Second recurrent vein with a single bulla. Nervellus intercepted below middle. Nervulus strongly prefurcal (intersticial in male). Propodeum without carinae ( Fig. 8 ).

Metasoma slightly compressed, shining, with rare hairs. First metasomal tergite 0.68 as broad as long; without shallow median longitudinal impression and longitudinal carinae. Spiracles not or protruding in profile Second metasomal tergite transverse. Subgenital plate slightly enlarged, in male notched. Parameres fused, broad basally, shorter than aedeagus ( Fig. 7 ). Aedeagus with very wide tip ( Fig. 7 ).

Color. Female. Body yellow ( Figs 4–8 ). Head yellow with introcellar area and vertex behind black ( Fig. 6 ). Antennae infuscate dorsally. Only hind tarsi infuscate, femora and tibiae yellow. Mesonotum with dark bands; tip of wing very slightly infuscate. First metasomal tergite pale yellow at base. Male with head mostly yellow, otherwise as in female.

Material. Holotype female, Peru, Department of Loreto, Iquitos area, Mishana, MT, 16.x–1.xi.1998, varillal, leg. Sääksjärvi I.E. et al., UNSM; Paratypes: female, the same locality as in holotype; male, Ecuador, Orellana, Onkone Gare, 00°39’25.7’’S, 76°27’10.8’’W, 216.3 m., canopy fogging, 9.x.1994, leg. T.L.Erwin, USNM.

Distribution. Peru.

Etymology. The species epithet refers to the village of Mishana (River Nanay, National Reserve of Allpahuayo- Mishana) which is located close to the type locality.

Figures

FIGURES 4 – 8. Paratype male Physotarsus mishanensis Reshchikov and Sääksjärvi sp. nov. 4) habitus; 5) face; 6) head, dorsal view; 7) male genitalia; 8) propodeum.