Lomachaeta vianai Casal, 1969

Williams, Kevin A., Cambra, Roberto A., Bartholomay, Pedro R., Luz, David R., Quintero, Diomedes & Pitts, James P., 2019, Review of the genus Lomachaeta Mickel, 1936 (Hymenoptera: Mutillidae) with new species and sex associations, Zootaxa 4564 (1), pp. 101-136 : 131

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Lomachaeta vianai Casal, 1969


Lomachaeta vianai Casal, 1969

( Figs 13, 14 View FIGURES 9–14 , 19, 20 View FIGURES 15–20 , 55 View FIGURES 53–56 )

Lomachaeta vianai Casal, 1969: 34 . Holotype, ♀, Argentina, Misiones, Dep. Concep. (AMNH, examined). Lomachaeta megomicron Williams & Pitts, 2009: 235 . Holotype, ♂, Argentina, Salta, 8km N La Viña (EMUS, examined), syn. nov.

Diagnosis. MALE. The following combination of characters is diagnostic for L. vianai : the body is black, except the pale yellow T1 apex; the mandible lacks a ventral tooth basally; the gena is weakly carinate; the head and pronotum are areolate; the forewing has its veins encompassing the basal 0.7 × of the wing; the T1 shape is disciform; the T2 disc has dense small punctures; the T2 fringe is composed of thick bristles; and the paramere is virtually straight and has an weak apical setal tuft. Body length 4–6 mm.

FEMALE. The following characters are diagnostic: the head and mesosoma are dark reddish, the metasoma is blackish; the pronotal and propodeal spiracles are scarcely swollen; the head is 1.2 × wider than the mesosoma; the lateral propodeal face has a few complete areolations; the mesosoma is elongate, with the thoracic dorsum nearly as long as wide; the mesosomal dorsum is tightly areolate without subparallel thickened setae; the T1 shape is subdisciform; T2 has dense oblique punctures, mostly subappressed pale yellow setae, and mostly smooth intervals; and the S6 lateral carina is low angular. Body length 2.5–4.5 mm.

Material examined. Type material. Holotype of Lomachaeta vianai , ♀, ARGENTINA, Misiones , Dep. Concepcion, Santa María, X.1956, M.J. Viana ( AMNH, Figs 13 View FIGURES 9–14 , 19 View FIGURES 15–20 ) ; Holotype of Lomachaeta megamicron , ♂, ARGENTINA, Salta, 8 km N La Viña, 26.X–13.XI.2003, M.E. Irwin & F.D. Parker coll. ( EMUS). Other material. ARGENTINA: Salta: 8 km N La Viña, 26.X–13.XI.2003, M.E. Irwin & F.D. Parker (1♂, EMUS, Fig. 55 View FIGURES 53–56 ); Chaco Occidental, Los Colorados , 100 km NE Joaquin V. Gonzales, 14.III.1992, B. Bestelmeyer (1♀, MIUP); Pocitos , XI.1978, Fritz (1♂, MIUP). BRAZIL, Goiás, Parque Nacional Chapada dos Veadeiros, A.P. Aguiar and B.F. dos Santos, Yellow Pan Trap: Ponto 1, 13–15.IX.2005 (1♂, UFES); Ponto 3, 19-21.IX.2005 (2♂, UFES); Ponto 6, 9–11.IX.2005 (1♂, UFES); Ponto 10, 9–11.IX.2005 (2♂, UFES); Ponto 15, IX.2005 (1♂, UFES). PARAGUAY: Boquerón, Mariscal Estigarribia , Escuela Agricola , 174m, 21 o 59’45”S 60 o 38’31”W, 5–7.X.2003, B. Garcette, Malaise (1♂, MIUP); Presidente Hayes, Los Pioneros, 22.69014 o S 59.77186 o W, 9–11.X.2003, M. LePonce, Pit Fall Trap (1♀, MIUP, Figs 14 View FIGURES 9–14 , 20 View FIGURES 15–20 ) GoogleMaps .

Distribution. Argentina (Catamarca, Misiones, and Salta Provinces), Brazil (Goiás), and Paraguay (Boquerón and Presidente Hayes Departments).

Remarks. Previously known from the unique type only, this species is now recognized as a widely distributed species in South America. Although this species is widespread, it is known from only seven localities. The sex association is based on a male and female collected in similar habitats (Chaco Boreal) in Paraguay.


American Museum of Natural History


Universidade Federal do Espirito Santo














Lomachaeta vianai Casal, 1969

Williams, Kevin A., Cambra, Roberto A., Bartholomay, Pedro R., Luz, David R., Quintero, Diomedes & Pitts, James P. 2019

Lomachaeta megomicron

Williams & Pitts 2009: 235

Lomachaeta vianai

Casal 1969: 34