Orthocentrus lostuxtlasi, Humala, 2019

Humala, Andrei E., 2019, Mexican species of the genus Orthocentrus (Hymenoptera, Ichneumonidae: Orthocentrinae), Zootaxa 4709 (1), pp. 1-83 : 15-16

Orthocentrus lostuxtlasi sp. nov.

( Figs 2 E , 9 E , 13 E , 16 E , 20 )

Material examined. Holotype ♀: México, Veracruz, Est. Biol. Trop. Los Tuxtlas, San Andrés , MT-II, 155 m, N 18°35.07′, W 95°04.47′, BTP, Fte aula lab. 16.XI–16.XII.2013, leg. M. Madora ( UNAM).

Description. Female. Fore wing length 2.3 mm.

Face medially 1.1 × wider than high, nearly matt, finely striate; temples with fine coriaceous sculpture; eyes setose, inner orbits divergent ventrally; dorsal ridge of face inbetween antennal sockets without a median prominence; profile nearly straight, edge of clypeus slightly convex, antennal sockets on a high shelf (Hw/Fp = 6.7); subocular sulcus nearly straight; maxillary palp reaching slightly beyond fore coxa. In dorsal view, head posteriorly strongly concave, temples short, but distinct, about 0.2 × eye width, minimum distance between eyes 0.4 × of head width; posterior ocelli distant from eye by 0.6 × ocellar diameter; anterior ocellus distant from eye by 1.6 × ocellar diameter; ocellar-ocular groove present. Minimum distance between antennal sockets about 1/2 diameter of socket; antenna thick basally and narrowing apically, comparatively short, with 24 subquadrate flagellomeres which not gradually shortening apically; basal flagellomere 1.1 × as long as apically wide and about 1/3 of the length of scape; scape nearly parallel-sided. Mesosoma smooth and polished except pronotum striate postero-ventrally; mesoscutum without notauli; in profile, scutellum not high, metapleuron slightly convex; propodeum with posterior transverse carina not developed between lateral longitudinal carinae and pleural carina, median longitudinal carinae complete, lateral longitudinal carinae present posterior to spiracles, spiracles medium-sized.

Legs slightly flattened, broad; coxae polished, femora polished-coriaceous, tibiae and tarsi coriaceous-granulate; hind coxa 1.2 × as long as first tergite, hind femur 3.0 × as long as high, hind tibia 3.5 × as long as apically wide; tibiae with spine-like setae.

Wings not particularly narrow; fore wing with areolet open, vein Rs upcurved; nervulus inclivous and postfurcal; hind wing with nervellus intercepted at lower 0.4.

First metasomal tergite evenly widening apically, 1.4 × as long as apically wide, coriaceous-rugose, with two well developed, posteriorly almost complete median longitudinal carinae; with deep transverse impressions originating at about middle of tergite, sloping posteriorly, not meeting centrally. Second tergite 0.8 × as long as apically wide, coriaceous-rugose, stubs of median longitudinal carinae present anteriorly, posterior transverse impression originating at about middle of tergite shallow and not meeting centrally; basal thyridia oval, not well-defined, second thyridia inconspicuous. Third tergite slightly coriaceous basally, all remaining tergites subpolished. Ovipositor slightly upcurved, without subapical dorsal notch; ovipositor sheath pointed.

Body largely setose except propleuron, pronotum, mesopleuron and metapleuron; setae very scattered on propodeum, tergites and posterior coxae.

Dark brown except clypeus, malar space, propleuron partly, pronotum in upper hind corner and ventrally, subalar prominence, mesepimeron reddish-brown; face shelf near antennal sockets, basal half of antennae, hind femur except apex, hind tibia except base and hind tarsus yellowish brown. Fore and mid legs mostly yellow. Tegula, mouthparts, propleuron ventrally, frontal orbits near antennal sockets, fore and mid coxa, hind coxa in apical third and all trochanters and trochantelli and sternites yellowish-creamy.

Male. Unknown.

Biology. Hosts unknown.

Distribution. Mexico (Veracruz).

Etymology. Named after the type locality in Mexico, Los Tuxtlas (Veracruz).

Comments. Compared with the other species that have antennal sockets on a high protruding shelf, thick, curled antennae, whole body not laterally flattened, the fore wing with areolet open, unlike all other species in the group except O. kasparyani . From similar O. kasparyani differs in setose eyes and fewer flagellomeres in antenna.

Figures

FIGURE 2. Lateral views: Orthocentrus shieldsi species-group (in part). A: areolatus, B: dorsofuscus, C: fuscipes, D: kasparyani, E: lostuxtlasi, F: microphthalmus. Scale 1.0 mm.

FIGURE 9. Faces: Orthocentrus shieldsi and O. montanus (in part) species-groups. A: areolatus, B: dorsofuscus, C: fuscipes, D: kasparyani, E: lostuxtlasi, F: microphthalmus, G: ocampo, H: vulgaris, I: zaldivari, J: khalaimi, K: malaris, L: montanus. Scale 0.2 mm.

FIGURE 13. Heads in dorsal view: Orthocentrus shieldsi and O. montanus species-groups. A: areolatus, B: dorsofuscus, C: fuscipes, D: kasparyani, E: lostuxtlasi, F: microphthalmus, G: ocampo, H: vulgaris, I: zaldivari, J: khalaimi, K: malaris, L: montanus, M: montezuma, N: sierrae, O: tlaxcalensis. Scale 0.2 mm.

FIGURE 16. Basal tergites: Orthocentrus shieldsi and O. montanus species-groups. A: areolatus, B: dorsofuscus, C: fuscipes, D: kasparyani, E: lostuxtlasi, F: microphthalmus, G: ocampo, H: vulgaris, I: zaldivari, J: khalaimi, K: malaris, L: montanus, M: montezuma, N: sierrae, O: tlaxcalensis. Scale 0.2 mm.

FIGURE 20. Distribution map of Orthocentrus in Mexico. O. fuscipes, O. lostuxtlasi, O. microphthalmus, O. ocampo