Brachycyrtus oculatus Cushman, 1936

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 : 38-41

publication ID	https://doi.org/ 10.11646/zootaxa.5430.1.1
publication LSID	lsid:zoobank.org:pub:5D688E51-9C95-40E5-B4A5-1B626541E0F7
persistent identifier	https://treatment.plazi.org/id/03B4D46B-FFA3-E335-32CC-AA72FBA7F864
treatment provided by	Plazi
scientific name	Brachycyrtus oculatus Cushman, 1936
status

Treatment

Brachycyrtus oculatus Cushman, 1936 View in CoL

( Figs. 42 View FIGURE 42 , 43 View FIGURE 43 )

Brachycyrtus oculatus Cushman, 1936: 22 View in CoL . Holotype female, Panama (USNM) [ National Museum of Natural History , Smithsonian Institution].

Habryllia oculatus (Cushman) ; Walkley 1956: 318.

Brachycyrtus oculatus Cushman View in CoL ; Wahl 1993: 104.

Material examined. 4 ♀ ♀. Holotype ♀ (scanned image) ( Fig. 42 View FIGURE 42 ). PANAMA, Cano Saddle / Gatun L. [Lake] Pan / R C Shannon / v. 8. 23// Type No. 50625/ U.S.N.M. [National Museum of Natural History, Smithsonian Institution]// Brachycyrtus / oculatus / type. Cush.// USNMENT 01520404 (http://n 2t.net/ark:/65665/33cc5f6ec-e830-437c-ad0d- 2b357d0ac710) (1 ♀, USNM). BRAZIL, RO [Rondônia]: Ouro Preto do Oeste / Reserva INPA, 06-12.vii.1995 / Arm. [armadilha] Malaise ; / J.A. Rafael e J. Vidal col. [collectors] (1 ♀, INPA). AM [Amazonas]: Manaus Res. [Reserve] Ducke / Platô leste/oeste/ Malaise , 09-20. x.2006 / J.F. Vidal, R. Ale-Rocha, / G. Freitas leg. [collector] // Brachycyrtus oculatus, D. R. R. Fernandes det. [determinant] 2019 (1 ♀, INPA). same, except Rio Preto da Eva / Santa Terezinha / 2°40’16.53” S- 59°39’20.50” W / Suspensa – 60 Mata / 13.xi.2013 / B. G. Oliveira leg. [collector] (1 ♀, INPA). GoogleMaps

Diagnosis. Brachycyrtus oculatus can be differentiated from other Neotropical Brachycyrtus by the combination of the following characters: propodeum granulate with sparse setae with area anterolateral black, area superomedia confluent with area petiolaris, anterior transverse carina complete to pleural carina, area dentipara not delineated, area posteroexterna closed, area coxalis not anteriorly delineated, lateral longitudinal carina delineated only posteriorly ( Figs. 43D, 43G View FIGURE 43 ).

Male. Unknown.

Variation (N=3). Body length 5.93–7.28 mm. Antenna length 5.72–6.91 mm; 33–34 flagellomeres. Ocellus diameter 0.28–0.31 mm; distance between the posterior ocellus 0.12–0.14 mm. Front view, eye height 0.85–0.93 mm. Frons width 0.41 mm – 0.55 mm. Malar space 0.05–0.06 mm. Pronotum with epomia, smooth, polished. Fore wing length 4.55–5.11 mm. Hind wing length 2.90–3.16 mm. Length tergite 1 1.07–1.18 mm; basal width tergite 1 0.24 mm; apical width tergite 1 0.32–0.38 mm. Length tergite 2 0.86–0.91 mm; apical width tergite 2 0.69 mm. Length tergite 3 0.65–0.78 mm; basal width tergite 3 0.65–0.80 mm; apical width tergite 3 0.75–0.88 mm. Length ovipositor 1.66–1.85 mm. Coloration of the spots scattered on the epicnemium can be reddish-yellow. Metapleuron can be reddish-yellow. Metasoma can be black with tergites 1–6 with yellow band posteriorly.

Geographical records. Brazil (Pará, São Paulo, Amazonas* and Rondônia *), Costa Rica, Panama, and Venezuela ( Cushman 1936; Walkley 1956; Onody et al. 2009; Yu et al. 2016; Fernandes et al. 2023) ( Fig. 44 View FIGURE 44 ).

Biological note. The host of this species is so far unknown. According to Gauld & Ward (2000), Brachycyrtus oculatus has been commonly collected in lowland habitats (below 300 meters altitude), in wet habitats and occasionally in dry areas in Costa Rica.

Discussion. Brachycyrtus oculatus is morphologically similar to B. obelix mainly in the set of carinae of the propodeum, area externa and area spiracularis confluent, area basalis septate and not delineated laterally, area superomedia confluent with area petiolaris, anterior transverse carina complete to pleural carina, lateral longitudinal carina delineated only posteriorly, area dentipara not laterally delineated, area posteroexterna closed, posterior transverse carina present lateromedially, area coxalis not anteriorly delineated. In B. obelix propodeum entirely yellowish-brown, polished with coarse punctures and sparse setae anterolaterally ( Figs. 38D, 38G View FIGURE 38 ). In contrast, in B. oculatus propodeum granulate with sparse setae with area anterolateral black ( Figs. 43D, 43G View FIGURE 43 ).

Remarks: The additional characters of the material examined from the states of Amazonas and Rondônia ( Brazil) (n=3) (♀) are the following: Head. Dorsal view ( Fig. 43C View FIGURE 43 ), ocelli forming a triangle. Distance between the anterior and posterior ocellus 0.05 mm; shortest distance between the posterior ocellus and the compound eye 0.07 mm. Front view ( Fig. 43B View FIGURE 43 ), frons polished, sparse setae short, convex. Face width 0.47 mm, punctate with sparse setae short, polished, convex. Basal mandible width 0.16 mm; bidentate. Mesosoma. Dorsal view ( Fig. 43E View FIGURE 43 ), mesoscutum with notaulus absent. Scutellum polished, punctate with sparse fine setae, as wide as it is long, moderately convex. Lateral view ( Fig. 43A View FIGURE 43 ), propleuron polished, punctate with sparse fine setae. Mesopleuron polished, punctate with sparse fine setae; epicnemial carina ascending about middle from the anterior margin of the mesopleuron and ventrally approaching the posterior carina of the sternum; sternaulus absent. Metapleuron smooth, polished. Wings. Fore, 2m-cu with two bullae. Hind, abscissa CU spectral. Metasoma. Basal width tergite 2 0.38 mm. Apex of ovipositor lanceolate, without teeth and without nodus ( Fig. 43F View FIGURE 43 ).