Brachycyrtus ocellicarinatus, Nascimento & Fernandes, 2024

Nascimento, Alexsandra C. & Fernandes, Daniell R. R., 2024, Synopsis of Brachycyrtus Kriechbaumer, 1880 (Hymenoptera: Ichneumonidae: Brachycyrtinae) from Brazil, with description of two new species, Zootaxa 5430 (1), pp. 1-62 : 35-38

Brachycyrtus ocellicarinatus sp. n.

( Fig. 40 )

Type material. 2 ♀ ♀. Holotype ♀. BRAZIL,AM [Amazonas]: Rio Preto da Eva / Aprisco Pasárgada / 2°40’18.15” S-59 °39’21.80”W / Suspensa – 60 Plantio / 28.iii.2014 / B. G. Oliveira leg. [collector] (1 ♀, INPA) ; Paratype ♀. AM [Amazonas]: Aripuanã / Reserva Soka / Malaise, 17-25.viii.1999 / J. F. Vidal & A. L. Henrique / leg. [collectors] (1 ♀, INPA) .

Diagnosis. Brachycyrtus ocellicarinatus sp. n. can be differentiated from other Neotropical Brachycyrtus by the combination of the following characters: ocellar carina connecting the posterior margins of the left and right lateral ocellar fovea ( Fig. 40C ); flagellum basally reddish-yellow, centrally yellow and apically dark brown ( Fig. 40A ); Propodeum granulate, punctate with sparse setae anterolaterally and posterolaterally, without punctures centrally, area superomedia and area petiolaris confluent, area basalis septate and not delineated anterolaterally, area externa and area spiracularis confluent, anterior transverse carina incomplete, posterior transverse carina not delineated centrally, area dentipara not delineated anterolaterally, area posteroexterna and area coxalis closed, lateral longitudinal carina anteriorly incomplete extending forward from the area posteroexterna ( Figs. 40D, 40G ).

Description. Holotype female ( Fig. 40 ). Body length 7.18 mm. Head. Antenna length 4.90 mm; 31 flagellomeres slender, with short and dense setae. Head polished; Occipital carina extending directly to the base of the mandible. Dorsal view ( Fig. 40C ), oblique temple weakly convex; ocelli forming an equilateral triangle; ocellar carina connecting the posterior margins of the left and right lateral ocellar fovea; ocellus diameter 0.31 mm; distance between the anterior and posterior ocellus 0.07 mm; shortest distance between the posterior ocellus and the compound eye 0.11 mm; distance between the posterior ocellus 0.20 mm. Front view ( Fig. 40B ), eye height 0.95 mm; eye with a shallow impression opposite antennal insertion. Frons width 0.67 mm, smooth, polished and convex. Face width 0.63 mm, polished, Punctate with fine setae and short. Malar space 0.11 mm. Clypeus 2 times as wide as it is long, truncated apically. Basal mandible width 0.13 mm, bidentate; slender with upper tooth wider than lower, slightly apically molded. Mesosoma. Dorsal view ( Fig. 40E ), mesoscutum punctate with fine setae; notaulus absents; scuto-scutellar groove broad and shallow, smooth and not anteriorly delineated by a carina. Scutellum punctate with setae. Propodeum granulate, punctate with sparse setae anterolaterally and posterolaterally, and without punctures centrally; area superomedia and area petiolaris confluent; area basalis septate and not delineated anterolaterally; area externa and area spiracularis confluent; anterior transverse carina incomplete; posterior transverse carina not delineated centrally; area dentipara not delineated anterolaterally; area posteroexterna and area coxalis closed; lateral longitudinal carina anteriorly incomplete extending forward from the area posteroexterna ( Figs. 40D, 40G ). Lateral view ( Fig. 40A ), propleuron smooth with sparse fine setae. Pronotum laterally smooth with sparse fine setae; epomia present. Mesopleuron weaklypunctate with sparse fine setae; epicnemial carina extending to the posterior part of the mesopleuron; sternaulus short. Metapleuron polished and punctate with dense setae. Mesosternal region short. Fore, mid and hind coxae with sparse setae and polished; trochanters with sparse setae and polished; trochantelli with sparse setae and polished; femurs with dense setae and polished; tibias with dense setae, denticles and apical fringe; tarsi with dense setae and denticles; simple tarsal claws. Fore leg with an apical tibial spur. Mid leg with two asymmetrical apical tibial spurs. Hind leg with two symmetrical apical tibial spurs. Wings. Fore wing length 4.87 mm; pubescent; region 1cu-a distal to base of M& RS; 2m-cu with two bullae. Hind wing length 3.24 mm, abscissa CU spectral. Metasoma. Polished, smooth, and pubescent. Tergite 1 punctate; length 1.10 mm; basal width tergite 1 0.27 mm; apical width 0.41 mm. Length tergite 2 0.94 mm; basal width 0.46 mm; apical width 0.85 mm. Length tergite 3 0.77 mm; basal width 0.88 mm; apical width 0.91 mm. Length ovipositor 2.03 mm; apex of ovipositor with five small teeth and with nodus ( Fig. 40F ).

Coloration. Head. Yellow with black triangular area interocellar and posteriorly separated with black occipital spot; flagellum basally reddish-yellow, centrally yellow and apically with 15 flagellomeres dark brown. Mesosoma. Predominantly yellowish with mesoscutum containing three longitudinal black bands and posteriorly with black scuto-scutellar groove; yellow scutellum with later brown spot, yellow and anteriorly black metanotum; tegula dark-brown; mesopleuron with a central diagonal black spot, black spot on the epicnemium and yellow sternal region; propodeum yellowish, anterolateral brown spots near the spiracles; metapleuron yellow. Fore and mid legs yellow, hind legs yellow with light-brown spots on coxa, trochanter, femur, and tibia basally and apically and tarsus yellow; tibial spurs entirely yellow. Wings. Iridescent hyalines; pterostigma yellowish-brown. Metasoma. Yellow with light-brown band anteriorly.

Male. Unknown.

Variation (n=1). Body length 7.99 mm. Antenna length 5.40 mm, 33 flagellomeres with short and dense setae, apically with 16 flagellomeres dark-brown. Basal mandible width 0.20 mm. Ocellus diameter 0.37 mm; shortest distance between the posterior ocellus and the compound eye 0.12 mm. Frons width 0.71 mm. Face width 0.70 mm. Eye height 0.98 mm. Malar space 0.08 mm. Fore wing length 5.79 mm; Hind wing length 3.79 mm. Length tergite 1 1.31 mm; basal width tergite 1 0.34 mm; apical width tergite 1 0.48 mm. Length tergite 2 1.20 mm; basal width tergite 2 0.64 mm; apical width tergite 2 1.26 mm. Length tergite 3 0.88 mm; basal width tergite 3 1.28 mm; apical width tergite 3 1.31 mm. Length ovipositor 1.53 mm.

Geographical records. Brazil (Amazonas) ( Fig. 41 ).

Biological note. The host of this species is so far unknown.

Etymology. The specific epithet ocellicarinatus alludes to the ocellar carina that connects the posterior margins of the left and right lateral ocellar fovea observed in this species. From Latin ocelli = "ocellus" + carina = "carina".

Holotype condition. Specimen transfixed with entomological pin in mesoscutum. Without the right fore wing.

Discussion. Brachycyrtus ocellicarinatus sp. n. is morphologically similar to B. veriatrix , for having the ocelli forming an isosceles triangle, yellow with black triangular area interocellar and posteriorly separated with black occipital spot, and mainly in the set of carinae of the propodeum, propodeum granulate, area externa and area spiracularis confluent, area superomedia confluent with area petiolaris, area posteroexterna and area coxalis closed, posterior transverse carina not delineated centrally, area dentipara not delineated anterolaterally, lateral longitudinal carina anteriorly incomplete extending forward from the area posteroexterna. In B. veriatrix propodeum punctate with sparse setae fine, area basalis septate and not delineated laterally, anterior transverse carina present only medially ( Figs. 48D, 48G ). In contrast, in B. ocellicarinatus sp. n. propodeum punctate with sparse setae anterolaterally and posterolaterally, without punctures centrally, anterior transverse carina incomplete, anterior transverse carina incomplete, lateromedially and centrally present, and area basalis is septate and not delineated anterolaterally ( Figs. 40D, 40G ).

Figures

FIGURE 40A–G. Brachycyrtus ocellicarinatus sp. n., holotype female. (A) Lateral habitus. (B) Head, Frontal view. (C) Head, dorsal view. (D) Propodeum, dorsal view. (E) Body, dorsal view. (F) Ovipositor, lateral view. (G) SEM of propodeum, dorsal view.

FIGURE 41. Map of geographical records of Brachycyrtus ocellicarinatus sp. n. (Legend: the Brazilian state of Amazonas where the species occurs is highlighted in gray. Blue circle for record and yellow star for type locality).

FIGURE 48A–G. Brachycyrtus veriatrix Gauld & Ward, 2000, female. (A) Lateral habitus. (B) Head, Frontal view. (C) Head, dorsal view.(D) Propodeum, dorsal view.(E) Body, dorsal view.(F) Ovipositor, lateral view.(G) SEM of propodeum, dorsal view.