Orthocentrus pictus, Humala, 2019

Humala, Andrei E., 2019, Mexican species of the genus Orthocentrus (Hymenoptera, Ichneumonidae: Orthocentrinae), Zootaxa 4709 (1), pp. 1-83 : 50-52

Orthocentrus pictus sp. nov.

( Figs 8 A , 12 G , 15 G , 18 G , 30 )

Material examined. Holotype ♀: México, Tamaulipas, Gómez Farias 5 km W, 800 m; 27.II.1999, leg. D. Kasparyan ( UAT).

Paratypes: 39 ♀ and 2 ♂: Tamaulipas, Gómez Farias, Los Cedros 24.I.1999,leg. D. Kasparyan; MT 16–26.XII.1998, 19–26.XII.1998, 26.XII.1998 – 7.I.1999, 16–23.I.1999, 23–30.I.1999, 27.II–20.III.1999, leg. S. Hernández & C. Covarrubias; Tamaulipas , 44 km S Cd. Victoria , MT, mator, 28.X–4.XI.2000, 18–25.XI.2000, leg. D. Kasparyan ; 40 km S Cd. Victoria, tropico de Cancer, 28.X–4.XI.2000, 9–16.XII.2000, leg. D. Kasparyan; Cd . Victoria, Corton Nouillo, B. pina-enano , 850 m, 3.II.1988, leg. J. de León; Tamaulipas, Hidalgo, Ej. El Chorrito, Galeria L. Negra , 11.III.1995, leg. S. Hernández Aguilar; Tamaulipas, rancho Sta. Elena , 15 km SW Cd. Victoria , 964 m, MT, 18–25.III (1f), 14–23.IV (3f), 23–30.IV.2010, leg. A. E. Humala & E. Ruíz C.; Tamaulipas, Ocampo, Ej. El Bejuco. B. Quercus , 900 m, MT, 28.V–11.VI.2016, leg. E. Ruíz C., M. & R. Ruíz C.; Tamaulipas, Palmillas, 23.16806° N, 99.561569° W, Ejido Llano de Azúa Juniperus y mat. espinoso , 1620 m, MT2, 10–29.X.2016, leg. E. Ruíz Cancino & J.M. Coronado B. ( UAT, UNAM, ZISP, KRC); Yucatán, Sudzal Chico ( SMSP) , XI–1999, leg. Hugo Delfín ( ZISP) .

Description. Female. Fore wing length 2.3–2.5 mm.

Face medially as wide as high; face and head between eyes at ocelli pustulate-papillate, eyes densely setose, inner orbits divergent ventrally; frons polished; dorsal ridge of face inbetween antennal sockets without a median prominence; face in profile slightly rounded, dorsally impressed, edge of clypeus slightly impressed, antennal sockets on a moderately high shelf (Hw/Fp = 4.3); subocular sulcus weak, shallow, sometimes indistinct, bent towards occiput; maxillary palp reaching to about epicnemial carina. In dorsal view, head posteriorly only slightly concave, temples short but distinct, about 0.2 × eye width, posterior ocellus separated from eye by 1.4 × ocellar diameter, anterior ocellus separated from eye by 1.9 × ocellar diameter, lacking ocellar-ocular grooves. Minimum distance between antennal sockets about 0.2 × diameter of socket; antenna about as long as body, with 31–32 elongate flagellomeres, apical ones subquadrate, flagellomeres gradually shortening towards apex; basal flagellomere 1.3–1.5 × as long as wide and about 1/2 of the length of scape; scape nearly parallel-sided.

Mesosoma smooth and polished but dorsal side of propodeum with weak microsculpture; notaulus not developed; in profile, scutellum not particularly high, metapleuron only very slightly convex; sternaulus absent; propodeum with posterior transverse carina present between lateral longitudinal carinae, median longitudinal carinae complete, lateral longitudinal carinae reach at least spiracles, spiracles small. Legs stout; coxae polished, femora polished-coriaceous, tibiae and tarsi finely granulate; hind coxa 1.1 × as long as first tergite, hind femur 3.0 × as long as high, hind tibia 4.2 × as long as apically wide; tibiae without spine-like setae.

Wings not particularly narrow; as a rule areolet open, or vein 3rs-m partly depigmented; vein Rs almost straight, slightly upcurving; stigma narrow and strongly asymmetrical, Rs+2 r meeting stigma at apical 2/3; nervulus oblique, strongly postfurcal; nervellus intercepted at lower third.

First metasomal tergite elongate, apically widening, 1.3 × as long as apically wide, evenly coriaceous-rugose, with two posteriorly almost complete median longitudinal carinae, with transverse impressions originating at about middle of tergite, sloping posteriorly, meeting centrally. Second tergite 0.8 × as long as apically wide; coriaceous, with transverse impressions originating at about middle of tergite, sloping posteriorly below second thyridia, meeting centrally; basal thyridia rectangular/oval, yellow, second thyridia slightly raised rounded-oval areas; remaining tergites nearly polished, slightly depressed at apex; ovipositor short and straight, without dorsal notch; its sheath not exceed apex of metasoma.

Body setose except pronotum, mesopleuron and metapleuron; setae few and scattered on propodeum and posterior sides of coxae

Mostly yellow to dark yellow except mouthparts and inner orbits at ocelli creamy, sternites creamy, fore and mid coxae and sometimes fore and mid legs, light yellow; interocellar area, antennae, temples partly, occiput and propodeum except metapleuron fuscous. Mesoscutum with brownish patches (one anterior and two lateral; sometimes also posterior mesoscutum brown); sometimes metapleuron yellowish-brown. Tergites brown except basal thyridia on second tergite, second tergite posteriorly and third tergite yellowish-brown. Wings hyaline, stigma and veins light brown.

Male. Similar to female; antennae long, with 35 elongate flagellomeres, basal flagellomere 3.0 × as long as wide, mesoscutum entirely rufous.

Biology. Hosts unknown.

Distribution. Mexico (Tamaulipas, Yucatan).

Etymology. The name of the species from Latin ‘ pictus’ meaning well coloured.

Comments. Compared with the other species that have completely papillate face, antennal sockets usually on a distinct but low shelf, setose eyes and second tergite with a posterior transverse groove, subocular sulcus is strongly bent towards the occiput, unlike in Central American O. flavifrons ; metapleuron is yellow to orange and basal flagellomere 1.2–1.3 × as long as wide, unlike in O. wahlbergi and O. veracruzus ; pterostigma strongly asymmetrical, unlike in O. minor and O. nicaraguensis .

Figures

FIGURE 8. Lateral views: Orthocentrus wahlbergi (in part) and O. insularis species-groups. A: pictus, B: podagricus, C: scabrosus, D: tamaulipecus, E: veracruzus, F: ruizi. 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 30. Distribution map of Orthocentrus in Mexico. O. pictus, O. sannio, O. scabrosus, O. veracruzus