Orthocentrus aztecus, Humala, 2019

Humala, Andrei E., 2019, Mexican species of the genus Orthocentrus (Hymenoptera, Ichneumonidae: Orthocentrinae), Zootaxa 4709 (1), pp. 1-83 : 42-43

Orthocentrus aztecus sp. nov.

( Figs 7 A , 12 A , 15 A , 18 A , 28 )

Material examined. Holotype ♀: México, Tlaxcala, Nanacamilpa, San Felipe Hidalgo, Ejido Los Búfalos , N 19°28′, W 98°35′, bosque Pino-Encino , 2830–2900 m, 1–26.VIII.2016, leg. Y. Marquez & A. Contreras ( UNAM).

Paratype: 1 ♀ Oaxaca, Santiago, Comaltepec , 2427 m, N 17.58424°, W 96.49428°; humid oak pine forest, MT, 12–20.VI.2007, leg. H. Clebsch ( ZISP) .

Description. Female. Body length 3.4 mm; fore wing length 3.2 mm.

Face medially 0.9 × wider than high; face protuberant, densely punctate, eyes not setose, dorsal ridge of face inbetween antennal sockets without a median prominence, inner orbits divergent ventrally; face profile slightly rounded, edge of clypeus nearly straight, antennal sockets on a shelf (Hw/Fp = 6.3); subocular sulcus sharp, bent towards occiput; maxillary palp reaching slightly beyond fore coxa. In dorsal view, head posteriorly deeply concave, temples distinct, 0.45 × eye width, posterior ocelli distant from eye by 1.2 × ocellar diameter, anterior ocellus separated from eye by 2.1 × ocellar diameter, ocellar-ocular grooves not developed. Minimum distance between antennal sockets about 0.4 × diameter of socket; antenna thick, with 27–28 similar-sized flagellomeres which not gradually shortening towards apex; basal flagellomere 1.2 × as long as wide and about 0.3 × length of scape; scape nearly parallel-sided.

Mesosoma smooth and punctured, pronotum with short striations postero-ventrally, some microsculpture on mesoscutum and propodeum; mesoscutum with notauli anteriorly; in profile, scutellum not particularly high, metapleuron slightly convex; propodeum with posterior transverse carina clearly present between lateral longitudinal carinae; median longitudinal carinae complete and subparallel, lateral longitudinal carinae clear posteriorly, spiracles small.

Legs all slightly flattened, broad; coxae polished, femora, tibiae and tarsi coriaceous-granulate; hind coxa as long as first tergite, hind femur 3.1 × as long as high, hind tibia 4.2 × as long as apically wide; tibiae with scattered, spine-like setae.

Wings not particularly narrow; fore wing with areolet closed, slightly wider than high, second recurrent vein (2m-cu) meeting areolet at apical 0.7, vein Rs straight, nervulus postfurcal; hind wing with nervellus not intercepted.

First tergite 1.2–1.3 × as long as apically wide; rugose-coriaceous, without median longitudinal carinae, with shallow transverse impressions originating at about middle of tergite, sloping posteriorly, not meeting centrally. Second tergite as long as apically wide; rugose-coriaceous, posterior margin polished, without transverse impressions; basal thyridia of second tergite oval/elongate, contrastingly coloured. Third tergite coriaceous basally, polished apically. Remaining tergites smooth, polished. Ovipositor straight, thin, without dorsal notch; ovipositor sheath pointed, with sparse setae longer than sheath width and backwards pointing.

Body largely setose except eyes, pronotum, mesopleuron and metapleuron; setae scattered on propodeum, basal tergites, and posterior sides of coxae.

Dark brown except large frontal orbital marks, upper face, clypeus and malar space, propleuron, posterodorsal corner of pronotum, tegula, subtegular ridge, fore and mid legs, hind trochanter, trochantellus and coxa apically yellow; antenna ventrally, second tergite with basal thyridia and narrow apical band orangey brown; hind femur infuscate medially, hind tibia and basitarsus except for basal third fuscous; mouthparts and sternites creamy.

Male. Unknown.

Biology. Hosts unknown.

Distribution. Mexico (Tlaxcala, Oaxaca).

Etymology. Named after the ‘Aztecs’—a Mesoamerican culture that flourished in central Mexico from the 14th to the 16th centuries.

Comments. Compared with the other species that have completely papillate face, antennal sockets on a distinct but low shelf, glabrous eyes and areolet closed, pronotum mostly fuscous, unlike in O. collaris ; frontal orbits with yellow spots and areolet slightly wider than high, unlike in O. winnertzii ; second tergite longer than apically wide and hind femur 3.1 × as long as high, mostly dark brown, unlike in O. asper .

Figures

FIGURE 7. Lateral views: Orthocentrus wahlbergi species-group (in part).A: aztecus, B: collaris, C: contrerasi, D: mexicanus, E: minor, F: oaxacae. Scale 1.0 mm.

FIGURE 12. Faces: Orthocentrus wahlbergi and O. insularis species-groups. A: aztecus, B: collaris, C: contrerasi, D: mexicanus, E: minor, F: oaxacae, G: pictus, H: podagricus, I: scabrosus, J: tamaulipecus, K: veracruzus, L: ruizi. Scale 0.2 mm.

FIGURE 15. Heads in dorsal view: Orthocentrus wahlbergi and O. insularis species-groups. A: aztecus, B: collaris, C: contrerasi, D: mexicanus, E: minor, F: oaxacae, G: pictus, H: podagricus, I: scabrosus, J: tamaulipecus, K: veracruzus, L: ruizi. Scale 0.2 mm.

FIGURE 18. Basal tergites: Orthocentrus wahlbergi and O. insularis species-groups. A: aztecus, B: collaris, C: contrerasi, D: mexicanus, E: minor, F: oaxacae, G: pictus, H: podagricus, I: scabrosus, J: tamaulipecus, K: veracruzus, L: ruizi. Scale 0.2 mm. Metasoma dorso-lateral view: M: Orthocentrus tergalis. Scale 0.5 mm.

FIGURE 28. Distribution map of Orthocentrus in Mexico. O. asper, O. aztecus, O. contrerasi, O. mexicanus