Tanytarsus insolens Dantas et Giłka, 2017

Dantas, Galileu P. S., Hamada, Neusa & Giłka, Wojciech, 2023, Tanytarsus van der Wulp (Chironomidae, Diptera): new species from the western Amazon region in Peru and Brazil, new records from the Neotropics, and remarks on the taxonomy of the genus, Zootaxa 5271 (1), pp. 115-139 : 132

Tanytarsus insolens Dantas et Giłka, 2017

Tanytarsus insolens Dantas et Giłka, 2017: 287 (adult male; Brazil, Amazonas, Manaus).

Tanytarsus pollicis Reis, Lin et Ferreira-Keppler, 2022: 427 (adult male; Brazil, Amazonas, Manaus), syn. nov.

Material examined. Holotype,adult ♁: BRAZIL. Amazonas: Puraquequara near Manaus , 02°43′02″S, 59°54′04″W, 07.vii.2015, Malaise trap, leg. G.P.S. Dantas ( INPA); paratypes: 4 ♁♁ (1 INPA, 3 LSZ DIZP), same data as for holotype except for date: 19.vi.2015. New material examined. BRAZIL. Pará: Belterra , igarapé na saída da FLONA, BR 163 , Km 85, 16-23.x.2019, 03°03′02′′S, 54°55′30′′W, Malaise trap, legs. J.O. Silva, G.J. Melo, R. B. Pinhedo, S.E. Santos, L.A. Oliveira, 1 ♁ ( INPA). Distrito Federal: Brasília, Reserva ecológica do IBGE, Roncador stream, 03.v.2018, 15°56′15′′S, 47°53′08′′W, 1064m a.s.l., Malaise trap, legs. G. R. Desidério, C.A. Campos, 1♁ ( INPA). Bahia: Barreiras, Rio de Janeiro river, 02.vi.2013, 11°53′53′′, 45°36′39′′, 735m. a.s.l., Leg. N. Hamada, 1 ♁, INPA.

Remarks. Complex structures can mislead. An example of a misunderstood structure of the hypopygium is the recently described Tanytarsus pollicis Reis, Lin et Ferreira-Keppler, 2022 , diagnosed on the basis of the superior volsella and the digitus ( Reis et al. 2022). The name (derived from Latin pollex =thumb) was referred to a “posterior projection of superior volsella”, unfortunately confused with the digitus, while a digitus sensu Reis et al. (2022) was misidentified with the anteroventral projection of the superior volsella, particularly well-developed in the kiche group (cf. Dantas & Giłka 2017, fig. 3). A “digitus with setae at apex”, that in fact is the anteroventral projection (homologous with anteroventral setal tubercle/tubercles present in the majority of Tanytarsus ), was incorrectly defined by Reis et al. (2022) as a unique feature in Tanytarsus . As a consequence, a new nomenclatural act was published (see the discussion therein). The material examined here, coming from several sites in Brazil, indicates that all the characters given in the original description of T. pollicis are identical or fall within the variability of Tanytarsus insolens Dantas et Giłka, 2017 (loci typici for the two names situated less than 25 km from each other). Consequently, both names are treated as synonyms.

Tanytarsus insolens was originally described on the basis of materials collected in the central Amazon ( Dantas & Giłka 2017). Here, we supplement the knowledge on the geographic range of this species to other areas of the Amazon, and also to the Cerrado biome.