New Tanytarsus van der Wulp from the Brazilian Amazonia indicate clues to intrageneric relations (Diptera: Chironomidae)

Abstract

Three new distinctive species of the genus Tanytarsus van der Wulp, 1874 are described from the Amazon rainforest, Brazil, and their systematic position is analysed. As a result, three new species groups are proposed. Tanytarsus illustris sp. nov. (Roraima) couples with T. hirsutus Trivinho-Strixino, Wiedenbrug et da Silva, 2015, both species featuring an elongated hypopygial anal tergite point lacking crests and spinulae, a strongly shortened digitus and a median volsella bearing two peculiar lamellae (the Tanytarsus hirsutus species group). Tanytarsus insignis sp. nov. (Amazonas) keys with T. impar Trivinho-Strixino et Strixino, 2004 and T. magnus Trivinho-Strixino et Strixino, 2004, all the species distinct in having an elongate superior volsella and digitus, a strong club-shaped inferior volsella and anal point lacking crests and/or spinulae (the Tanytarsus impar species group). Tanytarsus insolens sp. nov. (Amazonas) displays an extraordinarily structured, bilobed superior volsella, the character treated as diagnostic for a group proposed for this species and T. kiche Vinogradova, Riss et Spies, 2009 (the Tanytarsus kiche species group).

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

“…5). Among the Neotropical Tanytarsus, a similar anal point is known in T. fastigatus Reiss, 1972 (but broader Paggi, 1992 (triangular at tip), T. sanseverinoi Dantas, Amat, Hamada et Giłka, 2022 (nearly identical with T. pinedoi), T. tuberculatus Reiss, 1972 (with vestigial crests or flap-like enlargements), and in species of the impar group (but shorter, broader or with narrow crest) (Reiss 1972, Paggi 1992, Trivinho-Strixino & Strixino 2004, Trivinho-Strixino & Sonoda 2006, Trivinho-Strixino et al 2015, Dantas & Giłka 2017, Dantas et al 2022. The simple (bare) and slender anal point, but with round apex, we also describe in other new species here (see T. kaxinawa).…”

“…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.…”

Molecular phylogeny and temporal diversification ofTanytarsusvan der Wulp (Diptera: Chironomidae) support generic synonymies, a new classification and centre of origin

“…Specimens were identified morphologically using relevant taxonomic revisions and species descriptions (e.g. Lindeberg, , ; Reiss & Fittkau, ; Glover, ; Sasa, ; Sasa & Kawai, ; Sublette & Sasa, ; Cranston, ; Ekrem, , ; Ekrem et al ., ; Sanseverino, ; Cranston, ; Vinogradova et al ., ; Trivinho‐Strixino, , Trivinho‐Strixino et al ., ; Dantas & Giłka, ).…”

“…(). The Neotropical fauna has also been described quite extensively (Sublette & Sasa, ; Ekrem & Reiss, ; Sanseverino & Wiedenbrug, ; Sanseverino et al ., ; Sanseverino, ; Sanseverino & Fittkau, ; Cranston, ; Trivinho‐Strixino & Strixino, ; Vinogradova et al ., ; Sanseverino & Trivinho‐Strixino, ; Giłka & Zakrzewska, ; Trivinho‐Strixino et al ., ; Dantas & Giłka, ; Trivinho‐Strixino & Shimabukuro, ), and Sanseverino et al . () suggested the synonymy of the New World genus Nimbocera Reiss with Tanytarsus .…”

Cladotanytarsus crassus, a new North American non-biting midge with a distinctive hypopygial digitus (Diptera: Chironomidae)

“…GIŁKA 2005, EKREM 2007, EKREM & STUR 2009 and the Tanytarsina (e.g. REISS & SÄWEDAL 1981, KYEREMATEN & SAETHER 2000, EKREM 2001, EKREM et al 2003, SANSEVERINO 2006, STUR & EKREM 2006, GIŁKA & PAASIVIRTA 2007, DANTAS & GIŁKA 2017, LIN et al 2017. The fourth hypopygial appendix is defined as the inner apical finger of the superior volsella, called the digitus (SAETHER 1980).…”