Orthocentrus collaris, Humala, 2019

Humala, Andrei E., 2019, Mexican species of the genus Orthocentrus (Hymenoptera, Ichneumonidae: Orthocentrinae), Zootaxa 4709 (1), pp. 1-83 : 43-44

Orthocentrus collaris sp. nov.

( Figs 7 B , 12 B , 15 B , 18 B , 29 )

Material examined. Holotype ♀: México, Oaxaca, Santiago, Comaltepec , 2427 m, N 17.58424°, W 96.49428°; humid oak pine forest, MT, 12–20.VI.2007, leg. H. Clebsch ( UNAM).

Paratypes: 2 ♀ same data as for holotype ( UNAM and ZISP) .

Description. Female. Fore wing length 2.5–3.0 mm.

Face medially 1.0 × wider than high; face papillate-pustulate, eyes not setose, dorsal ridge of face inbetween antennal sockets without a median prominence; frons sparsely punctate; face profile almost straight, edge of clypeus slightly impressed, margin straight; antennal sockets on a shelf but shelf not particularly high (Hw/Fp = 5.4); subocular sulcus distinct, bent towards occiput; maxillary palp reaching to about epicnemial carina. In dorsal view, head posteriorly strongly concave, temples distinct, about 0.35 × eye width, posterior ocelli distant from eye by 1.2 × ocellar diameter, anterior ocellus separated from eye by 1.9 × ocellar diameter, ocellar-ocular grooves not developed. Minimum distance between antennal sockets about 0.3 × diameter of socket; antenna slender, with 26–29 (n=3) flagellomeres which not gradually shortening towards apex of antenna; basal flagellomere 0.9 × as long as wide and about 1/4 as scape; scape nearly parallel-sided.

Mesosoma smooth, polished; mesoscutum anteriorly with distinct notauli, propodeum with some microsculpture; in profile, scutellum not particularly high, metapleuron slightly convex; propodeum with carinae weak, posterior transverse carina present between lateral longitudinal carinae, median longitudinal carinae complete, subparallel; lateral longitudinal carinae present posterior to spiracles, spiracles small.

Legs moderately stout, hind leg massive; coxae and femora polished, tibiae and tarsi coriaceous-granulate; hind coxa 1.0 × as long as first tergite, hind femur 2.9 × as long as maximum depth, hind tibia 4.2 × as long as apical width; tibiae with scattered spine-like setae; spurs turned up inwards apically; hind claws enlarged.

Wings not particularly narrow; fore wing with areolet closed, wide, pentagonal, second recurrent vein (2m-cu) meeting areolet at apical 0.7; vein Rs bent upwards; hind wing with nervellus not intercepted.

First tergite slender, slightly widened apically, 2.3 × as long as apically wide; coriaceous, without distinct median longitudinal carinae, with transverse impressions originating at about apical third of tergite, sloping posteriorly, meeting centrally. Second tergite 1.2 × as long as apically wide; rugose, polished apically, with rounded posterior transverse groove, basal thyridia semicircular, contrastingly coloured, second thyridia present as raised, brown ovals in front of transverse groove. Third tergite coriaceous basally, sculpture towards posterior edge smoother, basal thyridia large, narrow, oval/rectangular, contrastingly coloured, second thyridia small circular. Remaining tergites smooth and polished. Ovipositor thin, straight, without subapical dorsal notch; ovipositor sheath bluntly pointed, with moderately long, backwards-directed setae.

Body largely setose except eyes, pronotum, mesopleuron, metapleuron, scattered on propodeum and posterior sides of coxae and femora.

Dark brown, except face, clypeus, malar space, base of antenna ventrally, propleuron, pronotum, subalar prominence, mesosternum posteriorly, mesepimeron, fore and mid legs except coxae and trochanters, hind trochanter and trochantellus, base of hind femur and basal band of hind tibia and hind basitarsus basally, basal thyridia yellowish; mouthparts, frontal orbital spots, tegula, fore and mid coxa, trochanter, trochantellus and sternites creamy.

Male. Unknown.

Biology. Hosts unknown.

Distribution. Mexico (Oaxaca).

Etymology. Named after the contrastingly coloured yellowish pronotum.

Comments. Compared with the other species that have completely papillate face, antennal sockets usually on a distinct but low shelf, glabrous eyes and areolet closed, basal flagellomere transverse, 0.9 × as long as wide, pronotum entirely yellowish, first tergite slender, 2.3 × as long as apically wide, unlike in O. asper , O. aztecus and O. winnertzii ; antenna slender, with 26–29 flagellomeres, unlike in O. podagricus and O. sannio .

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 29. Distribution map of Orthocentrus in Mexico. O. collaris, O. nicaraguensis, O. minor, O. oaxacae