Orthocentrus montanus, Humala, 2019

Humala, Andrei E., 2019, Mexican species of the genus Orthocentrus (Hymenoptera, Ichneumonidae: Orthocentrinae), Zootaxa 4709 (1), pp. 1-83 : 38-39

Orthocentrus montanus sp. nov.

( Figs 3 F , 9 L , 13 L , 16 L , 22 )

Material examined. Holotype ♀: México, Oaxaca, Santiago, Comaltepec , 3168 m, subalpine dwarf forest, N 17.56664°, W 96.49900°; YPT, 18–20.VI.2007, leg. H. Clebsch ( UNAM).

Paratypes: 3 ♀ Oaxaca, Santiago, Comaltepec , 3104 m, subalpine dwarf forest, N 17.56533°, W 96.49557° ; YPT, 18–20.VI.2007; 2938 m, N 17.57916°, W 96.50719°; 12–14.VI.2007 ; MT, 2427 m, N 17.58424°, W 96.49428°; humid oak pine forest, 12–20.VI.2007, leg. H. Clebsch ( UNAM & ZISP) ; 1 ♀ and 7 ♂ Tlaxcala, 15 km SSE Apizaco,

N slope of La Malinche volcano; N 19.27°, W 98.07°, 2550–3050 m, 1–2.X.2016, leg. A.E. Humala & A.I. Khalaim ( ZISP, KRC); 2 ♀ and 14 ♂ State of Mexico, Nevado de Toluca volcano, N 19.136°, W 99.790°, 3750–3830 m, 29.IX.2016, leg. A.E. Humala ( ZISP) ; 1 ♀ Tlaxcala, Nanacamilpa; San Felipe Hidalgo, Ejido Los Búfalos , N 19°28′, W 98°35′, 2830–2900 m, Bosque Pino-Encino , MT1, 4.IV–3.V.2016, leg. Y. Marquez A. & A. Contreras ( UNAM) ; 1 ♀ Hidalgo, Huasca de Ocampo, rancho Sta. Elena , MT, 2460 m, 29.XI–26.XII.2005, leg. Melendoz & Hdz. ( UNAM) ; 1 ♀ Tamaulipas, Gómez Farias, Alta Cima , 900 m, MT, 4–11.XI.2000, leg. D.R. Kasparyan ( UAT) .

Description. Female. Fore wing length 2.5–2.8 mm.

Face medially 1.1 × as wide as high; face smooth, polished, finely punctate; eyes not setose, dorsal ridge of face inbetween antennal sockets sometimes with a median blunt low prominence; face profile straight except dorsally very slightly impressed, edge of clypeus straight, antennal sockets not on a distinct high shelf (Hw/Fp = 6.1); subocular sulcus distinct, sharp, strongly bent towards occiput; maxillary palp reaching slightly beyond fore coxa. In dorsal view, head posteriorly moderately concave, temples short but distinct, about 1/3 of eye width, posterior ocellus separated from eye by 1.1 × ocellar diameter, anterior ocellus separated from eye by 2.2 × ocellar diameter, lacking ocellar-ocular grooves. Minimum distance between antennal sockets about 2/3 diameter of socket; antenna with 22–25 flagellomeres (n=) which gradually shortening towards apex of antenna; basal flagellomere 1.8 × as long as wide and about half of length of scape; scape nearly parallel-sided.

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 not particularly high, metapleuron slightly convex; propodeum with posterior transverse carina complete, strong and raised between lateral longitudinal carinae, weak laterally to lateromedian carinae, median longitudinal carinae weak but complete, lateral longitudinal carinae present posterior to spiracles or more or less complete, spiracles medium-sized.

Legs moderately stout; coxae and femora polished, femora with coriaceous microsculpture especially on posterior side, tibiae and tarsi coriaceous-granulate; hind coxa 1.0 × as long as first tergite, hind femur 3.1 × as long as high, hind tibia 3.8 × as long as apically wide; tibiae with spine-like setae.

Wings not particularly narrow; fore wing with areolet almost petiolate, vein Rs nearly straight; hind wing with nervellus intercepted at lower third.

First tergite slightly widening apically, 1.8 × as long as apically wide, in dorsal view, slightly wider at spiracles; coriaceous, with two indistinct median longitudinal carinae, with transverse impressions originating at about middle of tergite, sloping posteriorly, not meeting centrally. Second tergite 1.1 × as long as apically wide; coriaceous, basal corners impressed and transverse groove near apical margin bending anteriorly near lateral margins, forming a somewhat oval uplifted area medially; basal thyridia nearly oval, contrastingly coloured, second thryridia usually visible, round/oval, contrastingly coloured. Remainder of metasoma unsculptured, polished, lacking thyridia; third tergite with coriaceous microsculpture basally. Ovipositor thin, slightly upcurved, without distinct 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 to blackish brown; face and clypeus yellow, a little darker centrally, inner orbits broadly creamy to light yellow from antennal sockets to level of hind ocelli, antenna proximally, ventrally yellow; malar area abruptly creamy white posterior to subocular sulcus and up to level of ventral edge of eye; mouthparts except for fuscous apical palpomeres, fore and mid coxae, all trochanters and trochantelli creamy, remainder of fore and mid legs orange, hind coxa dark brown except apex orange, femur, tibia and tarsus orange with apex of femur and tibia dark brown; apical margin of second tergite yellow to orange.

Male. flagellum with 23–24 segments, basal flagellomere about 3.0 × as long as wide and slightly shorter than scape; face frontal orbits and scape ventrally matt and creamy; metasoma slenderer. Otherwise as female.

Biology. Hosts unknown. Collected on high altitudes 2400–3800 m.

Distribution. Mexico (Hidalgo, Oaxaca, State of Mexico, Tamaulipas, Tlaxcala).

Etymology. Named after the mountain habitats, where this species was collected.

Comments. Compared with the other species that have a complete posterior transverse carina, short notauli, and closed areolet, head slightly transverse (Hw/Fp = 6.1), frontal orbits entirely yellow up to occiput and apical bands on tergites 1–3 light brown, unlike in O. malaris and O. tlaxcalensis ; mesoscutum fuscous, unlike in O. montezuma and O. sierrae ; malar space and dorsal stripe along its upper side of pronotum yellowish, unlike in O. khalaimi .

Figures

FIGURE 3. Lateral views: Orthocentrus shieldsi (in part) and O. montanus (in part) species-groups.A: ocampo, B: vulgaris, C: zaldivari, D: khalaimi, E: malaris, F: montanus, 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 22. Distribution map of Orthocentrus in Mexico. O. khalaimi, O. montanus, O. montezuma, O. sierrae