Orthocentrus montezuma, Humala, 2019

Humala, Andrei E., 2019, Mexican species of the genus Orthocentrus (Hymenoptera, Ichneumonidae: Orthocentrinae), Zootaxa 4709 (1), pp. 1-83 : 39-40

Orthocentrus montezuma sp. nov.

( Figs 4 A , 10 A , 13 M , 16 M , 22 )

Material examined. Holotype ♀: México, Hidalgo, Huasca de Ocampo , rancho Sta. Elena, MT, 2460 m, 25.I– 23.II.2006, leg. Meléndez ( UNAM).

Paratypes: 1 ♀, the same place, but MT3, 25.XI–26.XII.2005, leg. Contreras et al. ( ZISP) ; 1 ♀, the same place, but 12.VII–17.VIII.2010, leg. A. Contreras et al. ( UAT) ; the same place, no date ( ZISP); Hidalgo, Tlanchinol, La cabaña, arroyo lento, N 21°01′19.5″, W 98°38′45.1″, 1520 m, MT, 17–30.VI.2005, leg. A. Contreras et al. ( UNAM) .

Description. Female. Fore wing length 3.1–3.2 mm.

Face medially 1.1–1.2 × as wide as high; face, polished, pustulate with some horizontal striae; eyes not setose, dorsal ridge of face inbetween antennal sockets without a median prominence; face profile slightly rounded, edge of clypeus straight, antennal sockets not on a high shelf (Hw/Fp = 8.3–8.7); subocular sulcus distinct, bent towards occiput; maxillary palp reaching slightly beyond fore coxa. In dorsal view, head posteriorly moderately concave, temples distinct, about 0.3 × eye width, posterior ocellus separated from eye by 0.8–1.2 × ocellar diameter, anterior ocellus separated from eye by 1.7–1.8 × ocellar diameter, lacking ocellar-ocular grooves. Minimum distance between antennal sockets about 1/2 diameter of socket; antenna with 26–27 flagellomeres (n=4) which gradually shortening towards apex; basal flagellomere 1.8–2.3 × as long as wide and about 2/3 of length of scape; scape in frontal view a little concave on lateral surface, convex on inner surface.

Mesosoma smooth and polished except for few striae postero-ventrally on pronotum, sometimes with weak microsculpture on propodeum; mesoscutum anteriorly with short notauli; in profile, scutellum moderately not particularly high, metapleuron slightly convex; propodeum with posterior transverse carina incomplete, median longitudinal carinae weak and sometimes obsolete anteriorly, lateral longitudinal carinae present as a short stubs posterior to spiracles, spiracles medium-sized.

Legs moderately stout; coxae and femora polished, femora with coriaceous microsculpture especially on pos- terior side, tibiae and tarsi coriaceous-granulate; hind coxa as long as first tergite, hind femur 3.0–3.1 × as long as high, hind tibia 4.2–4.4 × as long as apically wide; tibiae with spine-like setae, hind claws enlarged.

Wings not particularly narrow; fore wing with areolet narrowly sessile (almost petiolate), vein Rs slightly upcurved; hind wing with nervellus intercepted at lower third.

First tergite slightly widening apically, 1.8–2.0 × as long as apically wide, coriaceous, without median longitudinal carinae, with irregular logitudinal striae and transverse impressions originating at about middle of tergite, sloping posteriorly, not meeting centrally. Second tergite 1.1 × as long as apically wide; coriaceous, with irregular logitudinal striae; spiracles somewhat protruding; basal corners impressed and transverse groove near apical margin forming a uplifted area medially; basal thyridia nearly circular, contrastingly coloured, second thryridia small, oval contrastingly coloured. Remainder of metasoma unsculptured, polished, lacking thyridia; third tergite with coriaceous microsculpture basally. Ovipositor thin, straight, without dorsal notch; ovipositor sheath with sparse, long backwards-directed setae.

Body setose except eyes, pronotum, mesopleuron and metapleuron, setae very scattered on metasoma and posterior sides of coxae.

Dark brown to reddish-brown; mesoscutum reddish-brown with yellowish blurred lines along notauli; face and clypeus yellowish-brown; mouthparts, malar area posterior to subocular sulcus and up to level of ventral edge of eye, inner orbits broadly yellow from antennal sockets to level of posterior ocelli, base of antenna ventrally, fore and mid coxae, propleuron, pronotum dorsally and ventrally, subalar prominence, tegula, all trochanters and trochantelli light yellow; remainder of fore and mid legs yellow, hind legs brown except coxa apically, trochanters and trochantelli, femur, tibia and tarsus basally yellow; mesosternum and mesepimeron orange to light brown; posterior margin of first tergite and apical corners of second tergite yellow to orange; third tergite light brown, basal and apical margins yellowish.

Male. Unknown.

Biology. Hosts unknown. Collected on high altitude in state Hidalgo.

Distribution. Mexico (Hidalgo).

Etymology. Named after Montezuma—the last Aztec emperor, killed during the Spanish conquest of Mexico.

Comments. Compared with the other species that have a complete posterior transverse carina, short notauli, and closed areolet, head slightly transverse, frontal orbits entirely yellow up to occiput and apical bands on tergites 1–3 light brown, unlike in O. malaris and O. tlaxcalensis ; head posteriorly deeply concave and mesoscutum reddish brown with blurred notaular lines, unlike in O. khalaimi and O. montanus ; antenna with 26–27 flagellomeres, basal flagellomere 2.1–2.3 × as long as wide, face horizontally strigose, unlike in O. sierrae .

Figures

FIGURE 4. Lateral views: Orthocentrus montanus (in part) and O. maculae (in part) species-groups.A: montezuma, B: sierrae, C: tlaxcalensis, D: brevicornis, E: coronadoae, F: latus. Scale 1.0 mm.

FIGURE 10. Faces: Orthocentrus montanus (in part) and O. maculae species-groups. A: montezuma, B: sierrae, C: tlaxcalensis, D: brevicornis, E: coronadoae, F: latus, G: lopezi, H: rufipleuris, I: scutellatus, J: similis, K: tergalis, L: varicolor. 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 22. Distribution map of Orthocentrus in Mexico. O. khalaimi, O. montanus, O. montezuma, O. sierrae