Tanytarsus giovannii Sanseverino et Trivinho-Strixino, 2010

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 : 136-137

Tanytarsus giovannii Sanseverino et Trivinho-Strixino, 2010

( Fig. 10A–E )

Tanytarsus giovannii Sanseverino et Trivinho-Strixino, 2010: 71 (adult male, pupa, larva; Brazil, S„o Paulo State, S„o Carlos); Trivinho-Strixino et al. (2015): 100 ( Brazil, Mato Grosso do Sul, Corumbá); Lin et al. (2018): 6, 9, 10, 13, 16 (molecular systematics).

Material examined: BRAZIL. São Paulo: São Carlos, Ecological Park of São Carlos , 21°59′10″S, 47°52′51′′W, manual collection in freshwater sponge, 01.iii.2006, leg. L.M. Fusari, 1 ♁ with pupal and larval exuviae ( INPA) .

Remarks. To the recently established curvicristatus group we here include one more species, Tanytarsus giovannii , the adult male of which fits well into the group diagnosis ( Dantas et al. 2022). The hypopygial anal point crests are short and broad, rounded, flake-shaped, the anterior (smaller) bar is present, the posterior (larger) bar is branched and anteriorly directed and turned up, spinulae are absent, and the superior volsella has the well-developed posteromedian corner (cf. Fig. 10 and Sanseverino & Trivinho-Strixino 2010, fig. 11–14). The group diagnosis should be amended with one character—the length of the digitus that in T. giovannii is relatively long and extends beyond the concave median margin of the superior volsella ( Fig. 10D ). In the curvicristatus group, the anterior bar of the anal point can take a variety of interesting shapes, from a pine cone or grub to a form of a spine bunch.

Interestingly, Tanytarsus giovannii , along with two morphologically undefined Tanytarsus , has been postulated as a separate giovannii group based on molecular data, though T. giovannii has been reported as morphologically similar to T. curvicristatus and T. pseudocurvicristatus , and a cluster of T. giovannii + the two unnamed species has been presented as sister to T. curvircistatus ( Lin et al. 2018) . In light of the recent definition of the curvicristatus group ( Dantas et al. 2022) and the supplementation presented here, we see no reason to sustain the giovannii group based on two morphologically undefined and unnamed species. In the aftermath, the curvicristatus group is consisted of five Neotropical species: Tanytarsus curvicristatus Contreras-Lichtenberg, 1988 , T. germani Dantas, Amat, Hamada et Giłka, 2022 , T. giovannii Sanseverino et Trivinho-Strixino, 2010 , T. gnomon Dantas, Amat, Hamada et Giłka, 2022 , and T. pseudocurvicristatus Trivinho-Strixino, Wiedenbrug et da Silva, 2015 .

Figures

FIGURE 10. Tanytarsus giovannii Sanseverino et Trivinho-Strixino, 2010, male. A, B: hypopygium in dorsal (A) and ventral aspect (B); C: anal point; D: superior volsella and digitus; E: median volsella; C–E magnified × 2–3 relative to A and B.