Debilos petiolatum Scherrer & Aguiar 2012, sp. nov.
Creators: name: Scherrer, Marcus V.
name: Aguiar, Alexandre P.
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Ichneumonidae
Debilos
Debilos petiolatum

description: Debilos petiolatum Scherrer, sp. nov.   
(Figs 61, 118, 123, 139)  
 Description. Female. Fore wing 4.2 mm. Head: Antenna with 25–29 flagellomeres. Clypeus very sparsely punctate, markedly convex, most prominent ventrally, CWH 1.71; MWC 0.52, MLW 2.09, MWW 0.45; malar space long, MSM 1.45; supra-antennal area with almost indistinct, median, longitudinal carina; minimum distance from eye margin to occipital carina laterally distinctly longer than mandible base.   
 Mesosoma (Fig. 118). Pronotum lateral portion next to collar sub-laterally inconspicuously strigate-rugose, next to mesopleuron inconspicuously corrugated, epomia faint; notaulus moderately impressed, inconspicuously, minutely corrugated, especially anteriorly, reaching about middle of mesoscutum; mesopleuron dorsal margin medially inconspicuously strigulate, epicnemial carina restricted to ventral 0.6 of mesopleuron, posteriorly inconspicuously, densely corrugated; mesopleural groove moderately corrugated; sternaulus anterior half faintly corrugated; postpectal carina medially straight to slightly arched posteriorly; metapleuron, subapical fovea shallow, subcircular; pleural carina moderately stout, or inconspicuous; propodeum anterior area very long, PLL 1.30, anterior transverse carina distinct, complete, slightly, uniformly curved, sometimes medially slightly pointed forwards, posterior area without distinct ridges or rugae, uniformly colliculate with anterior area, spiracle subrounded, SWL 1.20, propodeal apophyses of regular height, thorn-shaped, AHD 2.64. Legs (Fig. 61): Hind t4 posterior lobe about 0.38 × as long as anterior lobe. Fore wing vein (Rs+M)b perfectly straight, limit with crossvein 1m-cu distinct, ramellus absent; vein Rs&1M uniformly slightly curved; crossvein 1cu-a uniformly slightly convex or straight, arising distinctly apicad vein Rs&1M, by about 0.2–0.3 × 1cu-a length, angle with vein M+Cu distinctly obtuse; vein 2Cua moderately shorter than crossvein 2cu-a, FWC 0.77; areolet moderately large, APH 1.17; vein 2Ma approximately as long as vein 2Mb, or a little shorter; vein 2Mb absent; crossvein 2m-cu with bulla short, about 0.2 × as long as vein length or shorter; vein 2Rsb slightly sinuous. Hind wing vein 2-1A moderately long, reaching about 0.6 × the distance to wing margin, HWC 2.22.   
 Metasoma (Fig. 118). T1 finely coriarious, spiracle at about basal 0.6, prominent, T1LW 3.04, T1WW 2.43, T1GL 0.29; T2 moderately short, apically robust, T2T1L 0.64, thyridium subcircular, T2LW 0.86, T2WW 2.14. Ovipositor approximately straight, OST 0.62, dorsal valve with nodus absent, notch absent; ventral valve tip without distinct serrations.   
 Color. Head and mesosoma black, legs orangish brown (153, 104, 026), metasoma mostly dark brown (084, 063, 033). Head: Scape ventrally and pedicel lightest; flagellomere 4 apical parts and 5–11 mostly or entirely white; mouth parts whitish (218, 216, 195), except mandible apex blackish. Mesosoma: Collar dorsally and propodeal apophyses white; mesoscutum lateral lobes and scutellum centrally occasionally brownish. Legs: Fore and mid coxae and trochanters light brownish (161, 139, 040) to whitish, fore one often white; femora basal margin, fore and mid tibiae anteriorly and posteriorly slightly whitish; hind tibia basal 0.1, t1 apically and t2–4 white (Fig. 61). Fore wing with two distinct dark spots, on apical half of cell 3M and 1+2R1, and cell 1Cu apical parts, and respective surrounding areas. Metasoma: T1 orangish brown; T1 apical 0.2 and T2 apical 0.3–0.4 with white stripe, T2 stripe about central 0.5 anteriorly slightly concave; T3 and T4 apical margin, and sternites medially lightest; T6 apical margin, and T7 and T8 dorsally white; ovipositor sheath dark brown, except basal 0.75–0.85 ventrally whitish; ovipositor light brown (187, 144, 084).   
 Male. Fig. 123. Antenna with 26–28 flagellomeres. General morphology and color similar to female, except for slightly smaller body size (fore wing about 3.80–4.82 mm); generally more pilose; flagellum without white band; propodeal apophyses absent, only vestigial and uniformly black with propodeum; fore wing without dark spots; legs generally lightest, yellowish brown; fore coxa entirely and mid coxa apical 0.3 white, except fore coxa apical margin dorsally brownish; hind femur distinct darkish apically; fourth tarsomeres not bilobed; T1 more slender, darkest, with spiracle prominent; T2 white stripe concavity reaching apical margin; T6–8 entirely brown, without lightest or white marks.   
 Variability. Color: Flagellomere 11 sometimes without white mark; fore wing sometimes with dark spots very faint, almost indistinct; extension and brightness of lightest marks on legs variable.   
 Comments. Included in the D. trochanteratum species group (see item Species Delimitation). Females of D. petiolatum are more likely to be mistaken for females of D. trochanteratum and D. labeculatum because of their similar color patterns and body size, but can be instantly isolated from those by having the mesopleuron dorsal margin medially inconspicuously strigulate (vs. without distinct ridges or rugae), fore wing vein 2Cua moderately shorter than crossvein 2cu-a, FWC 0.77 (vs. about same size of crossvein 2cu-a, D. labeculatum with FWC 0.91 and D. trochanteratum with FWC 0.90), hind t1 apically and t2–4 white (vs. t1 apical half and t2 basal half to entirely white), and T1 orangish brown, lighter than T2 (vs. dark brown, as darker as T2). Examined females of D. petiolatum are also somewhat similar to D. nivatum but can be separated from it by the white marks at mesosoma. Debilos petiolatum has the dorsal portion of collar and apophyses white, whereas D. nivatum has collar entirely, subalar ridge, scutellum apical 0.6 and apophyses white.   
 Males of D. petiolatum can be separated from males of D. trochanteratum by having the hind t1 apically and t2–4 white (vs. hind tarsus entirely dark brown), T2 with apical white stripe (vs. without white stripe), and T3 and T4 entirely dark brown (vs. T3 apical half and T4 basal half dark yellowish).   
 Etymology. From the word petiole, in reference to the tergite 1 of metasoma with lighter color than the other tergites in this species.   
 Distribution. Brazil. Recorded from one locality of Pará: Melgaço, Floresta Nacional de Caxiuanã (02°04’54”S 51°51’05”W) (Fig. 139).   
 Material Examined. 36 ♀, 25 ♂♂. Holotype ♀ from BRAZIL, Pará, Melgaço, Floresta Nacional de Caxiuanã, Trilha Igarapé Curua, 14–17.XI.2003, yellow pans, APAguiar & JDias, P05022 (UFES). In good shape, mounted on triangle point. Paratypes: BRAZIL: 2 ♂♂ from Pará, Melgaço, Floresta Nacional de Caixuanã, Trilha Igarapé Ararua, 15–18.IX.2003, APAguiar & JDias (UFES); 5 ♂♂, same data except 18–21.IX.2003 (UFES); 2 ♀, same data except 21–24.IX.2003 (UFES); 1 ♂, same data except 24–27.IX.2003 (UFES); 1 ♂, same data except Malaise trap, 18–24.IX.2003 (UFES); 1 ♀, 4 ♂♂, same data except, yellow pans, Trilha Igarapé Tijucaquara 15–18.XI.2003 (UFES); 1 ♀, same data except 18–21.XI.2003 (UFES); 2 ♀, 2 ♂♂, same data except 24–27.XI.2003 (UFES); 1 ♂, same data except Trilha Igarapé Curua, 14–17.XI.2003 (UFES); 1 ♀, same data except 17–20.IX.2003 (UFES); 1 ♀, same data except 20–23.IX.2003 (UFES); 1 ♀, 1 ♂, same data except 23– 26.XI.2003 (UFES); 9 ♀, 4 ♂♂, same data except Estação Científica Ferreira Pena, 13–16.XI.2003 (UFES); 5 ♀, 1♂ same data except 16–19.XI.2003 (UFES); 7 ♀, 3 ♂♂, same data except 19–22.IX.2003; 5 ♀, same data except 22–25.XI.2003 (UFES).
description: Published as part of Scherrer, Marcus V. & Aguiar, Alexandre P., 2012, 3469, pp. 1-76 in Zootaxa 3469 on pages 37-38