Tapajos, Trivinho-Strixino & Silva & Oliveira, 2013

Trivinho-Strixino, Susana, Silva, Fabio Laurindo Da & Oliveira, Caroline Silva Neubern De, 2013, Tapajos cristinae gen. n., sp. n. (Diptera: Chironomidae: Chironominae) from the Neotropical region, Zootaxa 3710 (4), pp. 395-399 : 396

Tapajos gen. n.

Type species. Tapajos cristinae sp. n., by present designation and monotypy.

Etymology. The genus is dedicated to a native Indian group, the Tapajós , which formerly lived in north Brazil. The gender of the genus name for the purposes of nomenclature is masculine.

Generic diagnosis. The genus can be separated from other Chironomini by the following combination of characters: eye bare; antenna with 11 flagellomeres; antepronotal lobes fused medially; fore tibia with inner scale low and rounded; superior volsella with a long sickle shaped, bare part arising from the distal lateral corner of a globose, densely trichiose base; inferior volsella sub-cylindrical, surpassing the anal point, distally setose and slightly expanded.

Generic description. Adult male. Head. Antenna with 11 flagellomeres, antennal ratio 2.06–2.50. Eye bare, dorsomedial extension containing 4–5 facets. Frontal tubercle small. Temporal setae 18–20, biserial. Clypeus quadrangular. Palp well developed.

Thorax. Antepronotal lobes fused medially, without notch. Scutum over-reaching antepronotum, tubercle absent. Acrostichals biserial, beginning near antepronotum. Dorsocentrals irregularly uniserial. Prealars uniserial. Scutellars biserial. Anepisternals, preepisternals and postnotals absent.

Wing. Membrane translucent, without setae. Costa not produced beyond R 4+5, ending very slightly beyond tip of M 3+4. R 2+3 running near R1. R 4+5 ending slightly proximal to wing apex, distal to end of M 3+4. RM angled obliquely to R 4+5. FCu distal to RM. Anal lobe weakly developed. Squama setose.

Legs ( Figs 1–2 ). Apex of fore tibia with inner scale broad and rounded, without spur. Mid and hind tibiae with separate combs, each comb with one short spur. Tarsal claws on all legs hook-like. Pulvilli well developed; empodium present.

Hypopygium. Tergite IX nearly quadrangular in dorsal view, with moderately pigmented, separate tergal bands of V-type. Anal point arising as a conical projection of tergite IX, distally parallel-sided. Gonocoxite stout. Superior volsella with a long sickle shaped, bare hook arising from the distal lateral corner of a globose, densely trichiose base; median volsella absent; inferior volsella sub-cylindrical, surpassing the anal point, distally setose and slightly expanded. Gonostylus with large median expansion on inner margin.

Female and immature stages. Unknown.

Figures

FIGURES 1–5. Tapajos cristinae sp. n., adult male. 1. Apices of fore, mid and hind tibiae. 2. Tarsal claws, pulvilli and empodium 3. Hypopygium; left: dorsal aspect, right: ventral/internal view. 4. Inferior volsella, lateral view. 5. Superior volsella.