Seticornuta rufa, Alvarado, 2022

Alvarado, Mabel, 2022, Darwin wasps of the genus Seticornuta Morley, 1913 (Ichneumonidae: Metopiinae) in the Neotropical region, with a key to species, European Journal of Taxonomy 839, pp. 149-175 : 170-173

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Seticornuta rufa

sp. nov.

Seticornuta rufa sp. nov.

Figs 9 View Fig , 10G View Fig , 11B View Fig


This species can be recognized by this combination of features: pronotum ventrally black and dorsally tawny, mesoscutum tawny with three black vittae, and metapleuron three-sided with the dorsal margin evenly down-curved.


The specific epithet ‘ rufa ’ means ‘red’ in Latin, in reference to the mesosoma color of this species.

Material examined


BRAZIL • ♀; “S.J. [São José do] Barreiro, Serra da Bocaina Braz. [Brazil] 1650m XI-68 Alvarenga & Seabra ”; USUC.



MEASUREMENTS. Body length 8.8 mm. Fore wing length 6.2 mm.

HEAD. Face+clypeus 1.0 × as wide as long; labrum not exposed when mandibles closed; malar space 0.6 × as long as basal mandibular width; lateral ocellus separated from compound eye by 0.9 × ocellar diameter, distance between ocelli 1.5 × maximum ocellar diameter; head posteriorly behind ocellar triangle flat; gena, on lateral view 1.0 × as long as compound eyes; occipital carina absent ventrally; antenna with 34 flagellomeres, ratio of length from second to fourth flagellomeres: 1.2:1.1:1.1, subapical flagellomere 1.3 × as long as centrally wide.

MESOSOMA. Epicnemial carina complete; metapleuron with dorsal margin evenly declivous, polished with isolated setae; submetapleural carina smooth, anteriorly expanded into a conspicuous lobular lobe. Propodeum with lateromedian longitudinal carina strong, slightly closer subbasally; lateral longitudinal carina weak but discernible, absent anterior to spiracle; posterior transverse carina complete. Fore wing with Cu1a between Cu1b and 2m-cu 1.7 × as long as Cu1 between Rs&M and 1m-cu. Hind wing with distal abscissa of Cu1 weakly sclerotized.

METASOMA. Metasoma with tergite I 1.3 × as long as posteriorly wide, lateromedian carinae extending 0.3 × length of tergite; tergite II 0.8 × as long as posteriorly wide; laterotergite II 0.4 × as long as wide, subrectangular; laterotergite III 0.5 × as long as wide, subrectangular.

COLOR. Head extensively black except palpi and face+clypeous yellow and tawny orbits from posterior ocelli to gena. Mesosoma predominantly black except propodeum dorsally, mesoscutum (except three brownish black vittae) and scutellum reddish tawny (except anteriorly brownish); tegula yellowish; prolegs brownish black except trochanter distally, femur basally and distally, tibia, and, tibial spur yellowish, and tarsomeres (except, distal third of basitarsomere, and tarsomeres 2–4 yellowish brown) yellowish; mesoleg brownish black except trochanter distally, femur basally and distally, and tibia dorsally yellow; mesotibia ventrally and mesotarsomeres brownish yellow; metaleg brownish black except reddish tawny spot posteriorly in coxa, femur basally and distally, and tibia dorsally yellow; meso- and metatibial spur whitish; and, ovipositor valvae testaceous; wings slightly infuscate; metasoma brownish black with tergites grading posteriorly and laterally to reddish brown.




This species was collected in the Brazilian state of São Paulo ( Fig. 11B View Fig ), at the same locality and date as S. carinata sp. nov.