Orthocentrus flavoorbitalis, Humala, 2019

Humala, Andrei E., 2019, Mexican species of the genus Orthocentrus (Hymenoptera, Ichneumonidae: Orthocentrinae), Zootaxa 4709 (1), pp. 1-83 : 69-70

Orthocentrus flavoorbitalis sp. nov.

( Figs 6 B , 11 B , 14 K , 17 K , 24 )

Material examined. Holotype ♀: México, Nayarit: Tepic, V. [Venustiano] Carranza , 28 m, 20.I.2016, leg. A. Robles B. ( UNAM).

Paratype: 1♀, same data as for holotype ( ZISP) .

Description. Female. Fore wing length 3.0 mm.

Face medially 1.1. × wider than high; face and head between eyes at ocelli papillate, eyes glabrous, dorsal ridge of face inbetween antennal sockets without a median prominence; face in profile slightly convex, edge of clypeus impressed, antennal sockets not on a distinct shelf (Hw/Fp = 8.1); subocular sulcus distinct, straight; maxillary palp long, reaching to mid coxa. In dorsal view, head posteriorly concave, temples about 0.2 × eye width, posterior ocellus separated from eye by 1.1 × ocellar diameter, anterior ocellus separated from eye by 1.9 × ocellar diameter, without ocellar-ocular grooves. Minimum distance between antennal sockets about diameter of socket; antenna about as long as body, thin, slender, with 29–31 (n=2) elongate flagellomeres which gradually shortening towards apex; basal flagellomere 4.5 × as long as wide and nearly as long as scape; scape in frontal view slightly concave on lateral surface, convex on inner surface.

Mesosoma smooth and polished; mesoscutum lacking notauli; in profile, scutellum moderately high, metapleuron slightly convex; propodeum with posterior transverse carina present between lateral longitudinal carinae, median longitudinal carinae complete, and lateral longitudinal carinae reach up to the level of spiracles or slightly below, spiracles small.

Legs moderately broad; coxae polished, femora polished, coriaceous on posterior surface, tibiae and tarsi coriaceous granulate; hind coxa 1.1 × as long as first tergite, hind femur 3.3 × as long as high, hind tibia 4.0 × as long as apical width; tibiae with spine-like setae; hind claws enlarged.

Wings not particularly narrow; fore wing with areolet, but 3rs-m faint and depigmented, slightly longer than 2rs-m; Rs+2 r meeting stigma at apical 0.7; second recurrent vein (2m-cu) meeting areolet at apical 0.6, vein Rs straight; nervulus oblique, slightly postfurcal; stigma asymmetrical, hind wing with nervellus not intercepted.

First tergite elongate, apically slightly widening, 1.7–1.9 × as long as apically wide; coriaceous, with two posteriorly almost complete subparallel median longitudinal carinae, with transverse impressions originating at about middle of tergite, sloping posteriorly, not meeting centrally. Second tergite 1.1–1.3 × as long as apically wide; longitudinally rugose-strigose, with central area bounded by well defined posterior roundish transverse groove and anterolateral diagonal impressions; basal thyridia oval/rectangular, second thyridia small raised roundish areas. Remaining tergites slightly compressed, smooth and polished. Third tergite with anterior edge and corners slightly impressed. Ovipositor slightly upcurved, narrowed in apical third, without dorsal notch; ovipositor sheaths with distinct backward-pointing setae.

Body largely setose except eyes, pronotum, mesopleuron and metapleuron; setae few and scattered on propodeum and lateral sides of coxae and hind femora.

Yellow except mouthparts, sternites and fore and middle coxae, trochanters and trochantelli, creamy to light yellow. Yellow except antenna apically; pronotum and mesopleuron dorsally, mesoscutum with a patch posteriorly, scutellum, metasoma from tergite 3, apical marks on hind coxae, apical hind femur and tibia yellowish brown to brown; dorsal head at interocellar area and temples partly; narrow basal band on hind tibia, metapleuron and propodeum, tergites 1–2 dark brown.

Male. Unknown.

Biology. Hosts unknown.

Distribution. Mexico (Nayarit).

Etymology. Named after the yellow orbits.

Comments. Compared with the other species that have completely papillate face, antennal sockets on a distinct but low shelf, and glabrous eyes, antenna long and slender, areolet closed and head posteriorly strongly concave, unlike in O. rhombifer ; frontal orbits yellow up to occiput, unlike in O. elongatus and O. longiventris ; basal flagellomere 4.5 × as long as wide, unlike in O. hidalgoensis and O. ungularis .

Figures

FIGURE 6. Lateral views: Orthocentrus ungularis species-group. A: elongatus, B: flavoorbitalis, C: hidalgoensis, D: longiventris, E: rhombifer, F: ungularis. Scale 1.0 mm.

FIGURE 11. Faces: Orthocentrus ungularis species-group.A: elongatus, B: flavoorbitalis, C: hidalgoensis, D: longiventris, E: rhombifer, F: ungularis. Scale 0.2 mm.

FIGURE 14. Heads in dorsal view: Orthocentrus maculae and O. ungularis species-groups. A: brevicornis, B: coronadoae, C: latus, D: lopezi, E: rufipleuris, F: scutellatus, G: similis, H: tergalis, I: varicolor, J: elongatus, K: flavoorbitalis, L: hidalgoensis, M: longiventris, N: rhombifer, O: ungularis. Scale 0.2 mm.

FIGURE 17. Basal tergites: Orthocentrus maculae and O. ungularis species-groups. A: brevicornis, B: coronadoae, C: latus, D: lopezi, E: rufipleuris, F: scutellatus, G: similis, H: tergalis, I: varicolor, J: elongatus, K: flavoorbitalis, L: hidalgoensis, M: longiventris, N: rhombifer, O: ungularis. Scale 0.2 mm.

FIGURE 24. Distribution map of Orthocentrus in Mexico. O. elongatus, O. flavoorbitalis, O. longiventris, O. rhombifer