Tabanus ornativentris
Creators: name: Dutra, Maria Carolina Pimenta
name: Amorim, Dalton De Souza
name: Carmo, Daniel Dias Dornelas Do
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Tabanidae
Tabanus
Tabanus ornativentris

description: Tabanus ornativentris (Kröber)
(Figs 42 A–D, 43 A–D, 44)
Hybostraba ornativentris Kröber, 1929a: 182, pl. 2, figs. 10–11 (in the syn. of druyvesteijni Szilády, 1926); Fairchild, 1956: 25 (syn.), 1967b: 363 (list of species; as Tabanus (Lophotabanus).
Tabanus interpunctus Lutz 1918 in Lutz et al. 1918: 167 (Tabanus), nomen nudum; Fairchild, 1961a: 288 (list of species, as syn. of T. nebulosus spp. ornativentris).
Tabanus nebulosus ornativentris; Coscarón, 1967: 127 (list of species); Coscarón, 1979: 266, figs. 4F–T (list of species); Hack, 1970: 274, tables 6, 9–10, gaph 6 (period of activity); Moucha, 1969: 2 (Stuttgart Museum types); Fairchild, 1984: 28, map 3 (rev.); Chainey, 1990: 295 (cat.); Coscarón et al., 1998: 96, figs. 21–22 (larva), 23–28 (pupa); Barros et al., 2003: 10,11,13, table 1,2 (list of species); Miletti et al. 2011: 125, table 1 (seasonality); Coscarón & Papavero, 2014 (key imm.); Krolow & Henriques, 2017: 4 (list of species); Coscarón & Martínez, 2019: 45 (list of species); Guimarães & Aguiar, 2019: 18 (list of species); Koller et al., 2019: 1393–1395, table 1,2 (list of species).
Tabanus nebulosus var. ornativentris; Moucha, 1976: 120 (cat.).
Distribution: Brazil (Mato Grosso, Mato Grosso do Sul, Santa Catarina), Argentina (Tucumán, Formosa, Corrientes, Santa Fé, Chaco), Bolivia (Potrero), Paraguay, and Uruguay.
Type-locality: Argentina, Formosa; Bolivia, Portrero.
Diagnosis: Large specimens (15–19.1 mm). Frons narrow (FI: 4.16–5.63), convergent at base (DI: 1.25–1.66). Wing with strong dark clouds at crossveins and fork of vein R 4+5. Fore tibia bicolored, paler at base. Dorsal comb of black setae on hind tibia. Abdomen reddish-brown, last tergites may be darker, may present a dorsomedial black integumental stripe (tergite 1 to 7 or less), and may also present dorsomedial triangles and dorsolateral oblique spots of pale setulae when well-preserved.
Remarks: Kröber (1929a) redescribed Tabanus druyvesteijni Szilády, a junior synonym of T. nebulosus, mentioning that the specimens under his possession was originally recognized as Hybostraba ornativentris. Although he never formally described the species, Kröber (1929a) commented that H. ornativentris would be a junior synonym of T. druyvestreijni. Fairchild (1956) placed T. ornativentris as a subspecies of T. nebulosus, what was later followed by Coscarón (1979). In the material available to Fairchild (1956), there was no geographical overlap of T. ornativentris with T. nebulosus (Fairchild, 1984, map 3)—his records of T. ornativentris at that moment were for Argentina, Paraguay, and Bolivia, while the records for T. nebulosus were from Brazil (Pará, Mato Grosso), Venezuela, Belize, and Nicaragua. As more data became available, geographic overlap between both these nominal species have been observed in the states of Mato Grosso do Sul and Mato Grosso (Krolow & Henriques, 2017). In the Catalog of Neotropical Tabanidae (Coscarón & Papavero, 2009b), T. ornativentris was treated as a synonym of T. nebulosus, but without addressing the morphological differences to support the synonymy. More recently, in their catalog for the fauna of Tabanidae from Uruguay, Coscarón & Martinez (2019) treated T. ornativentris as a subspecies of T. nebulosus, again without a formal discussion. Recently, Krolow et al., (2024) proposed the revalidation of T. ornativentris as a valid species. We agree with their position and there are noticeable morphological differences between the two species, as already mentioned in the literature (e.g. Coscarón, 1979; Fairchild, 1984; Coscarón et al., 1998). T. ornativentris is easily separated from T. nebulosus (see T. nebulosus) due to the strong clouds present on the wing crossveins, reduced dorsolateral abdominal setulose pale triangles. An additional character is that T. nebulosus has a comb of golden setae along the hind tibia, while in T. ornativentris these setae are black. T. ornativentris also differs from T. nebulosus in larval morphology (Coscarón et al., 1998). The male is similar to the female, except for the reduced mouthparts, slender antenna, holoptic eyes with the facets well-demarcated, and the largest ones occupy the upper half of the eyes and are lighter than the smaller ones. The distribution of T. ornativentris is pretty much well delimited and perfectly fits the Northern Argentina and Southern Brazil pattern of Amorim & Pires (1996).
Examined material: SISBIOTA CNPq/FAPESP [on the lateral of the label], BRASIL, MT [Mato Grosso do Sul], Porto Murtinho, 21°40’59.7”S 57°46’42.5”W, Malaise 31, 26.xii.2011 – 10.i.2012, Lamas, Nihei & eq col. [1♀] [MZUSP]; BRASIL, Mato Grosso do Sul, Porto Murtinho, Ponto APA Cachoeira, 21°50’0.5”S 57º 34’742”W, Malaise 1, 21–29.i.2008, Esteves et al col. [1♀] [MZUSP]; BRASIL, MS [Mato Grosso do Sul], Porto Murtinho (norte), Estrada para Pirizal—Km18, 21°33’0.5”S 57º45’35”W, 19–31.i.2008, Nihei S, Figueiredo [2♀] [MZUSP]; BRASIL, Mato Grosso do Sul, Porto Murtinho, Fazenda São Fernando—Km 12, 21°36’30”S 57º49’02”W, 19– 31.i.2008, Nihei S, Figueiredo R & Almeida J (col.) [1♀] [MZUSP]; SISBIOTA CNPq/ FAPESP [on the lateral of the label], BRASIL, Mato Grosso do Sul, Corumbá, Passo do Lontra —BEP, 19°34’20.09”S 57º00’57.9”W, Malaise 2, 06–18.ix.2011, Lamas, Nihei & eq. col. [1♀] [MZUSP]; 06.x.47 [on the lateral of the label], PARAGUAY, Vila Rica [Guairá], Schade col. [One female photographed] [1♀, 2♂] [MZUSP]; xi.47 [on the lateral of the label], PARAGUAY, Vila Rica [Guairá], Schade col. [One male photographed] [1♀, 1♂] [MZUSP]; 22.xii.49 [on the lateral of the label], PARAGUAY, Vila Rica [Guairá], Schade col. [1♂] [MZUSP]; xi.50 [on the lateral of the label], PARAGUAY, Vila Rica [Guairá], Col. Duvet [on the back of the label] [1♀] [MZUSP]; Sacupay, PARAGUAY [Paraguarí], 23/24.xi.71 [1♀] [MZUSP]; 28.ii.47 [on the lateral of the label], PARAGUAY, Serra Pelada, Schade col. [1♀] [MZUSP]; General Pedro (N), PARAGUAY, 1972 [1♀] [MZUSP]; 9.xii.45 [on the lateral of the label], ARGENTINA, Saltá, Sta. Victoria, Col. Duret [1♀] [MZUSP]; i.1947 [on the lateral of the label], ARGENTINA, Chaco, Resistencia, Coll Duret, Baero Leg. [on the lateral of the label] [1♀] [MZUSP]; i.1947 [on the lateral of the label], ARGENTINA, Chaco, Resistencia, Coll Duret, Baero Leg. [on the lateral of the label] / Compared homo- [handwritten] with type ♀ Tabanus ornativentris C.B. Philip 56, Krb. Agrees closely [1♀] [MZUSP]; 18.xii.49, [on the lateral of the label] Chaco [ARGENTINA], La Verde, Col. Duret [1♀] [MZUSP]; 2.xii.49 [on the lateral of the label] ARGENTINA, Chaco, Laguna Limpia, Col. Duret [1♀] [MZUSP]; 18.xi.49 [on the lateral of the label], Chaco [ARGENTINA], Las Palmas, Rio de Oro, Col. Duret [1♀] [MZUSP]; 11.xii.50 [on the lateral of the label], Chaco [ARGENTINA], Pto. Bermejo, Col. Duret [1♀] [MZUSP]; I– II-1953 [on the lateral of the label], Rep. Argt. [ARGENTINA], Terr. Formosa, Gran Guardia, Col. J. Foerster [1♀] [MZUSP]; 26.i.48 [on the lateral of the label], ARGENTINA, Jujuy, St. Barbara, Col. Duret [1♀] [MZUSP].
description: Published as part of Dutra, Maria Carolina Pimenta, Amorim, Dalton De Souza & Carmo, Daniel Dias Dornelas Do, 2025, Taxonomic revision of the Tabanus nebulosus species group (Diptera: Tabanidae), pp. 1-48 in Zootaxa 5588 (1) on pages 28-30, DOI: 10.11646/zootaxa.5588.1.1, http://zenodo.org/record/14895899