Tanytarsus angelae, Trivinho-Strixino, Susana & Shimabukuro, Erika Mayumi, 2017

Trivinho-Strixino, Susana & Shimabukuro, Erika Mayumi, 2017, Tanytarsini (Diptera: Chironomidae) from madicolous habitat in Southeast Brazil: new species and new records, Zootaxa 4269 (3), pp. 427-437 : 428-429

Tanytarsus angelae sp. n.

Type material. Holotype male, Brazil, Minas Gerais State, Pedra da Mina Mountain , 22˚24'697''S/44˚50'930'' W 2,218 m a.s.l., small pool, leg E.M. Shimabukuro, G. Perbiche-Neves. 8.viii.2013 (A3-42, LEIA-UFSCar) . Paratype male, Brazil, Rio de Janeiro State, Teresópolis, Sino Mountain , 22°27'605'S/43°01'689'' W 2,126 m a.s.l. small rock under a fountain, leg E.M. Shimabukuro, G. Perbiche-Neves. 29.vii.2014 (A3-43, LEIA-UFSCar).

Additional material. 1 male, Brazil, Rio de Janeiro State, Teresópolis, Sino Mountain , 22°26'848'S/ 43°00'798''W 1444 m a.s.l. collected in marginal rock of a stream, leg E.M. Shimabukuro, G. Perbiche-Neves. 29.vii.2014 (A3-44, LEIA-UFSCar).

Etymology. Named in honour of Dr. Angela Sanseverino, a friend and great researcher of Brazilian Tanytarsini .

Diagnostic characters. Tanytarsus angelae can be separated from other Tanytarsus species by the combination of the following characters: anal point thin, without crests and with four long setae on each side. Superior volsella almost squared with rounded posterior projection; digitus finger-like, extending beyond median margin of superior volsella.

Description. Adult male (n = 2). Small, total length 2.50 mm. Wing length 1.77–1.95 mm.

Coloration: Head, flagellum and maxillary palp yellowish. Thorax, abdomen and legs yellow.

Head: AR 0.63. Total length of antenna 906 µm. Eyes with large dorsal extension; temporals 11; clypeus with 9 setae. Palpomeres 2–5 lengths: 31, 112, 137, 225 µm.

Thorax: Length 0.87 mm. Scutal tubercle absent; acrostichals 16–17, biserial, beginning near antepronotum; dorsocentrals 8–9; prealar 1; scutellars 5.

Wing: Width 0.51 mm; VR 1.24. Brachiolum with 1 seta, Sc bare, all wing veins and cells setose.

Legs: Fore leg tibia bearing single spur, 21µm (1) long. Mid leg tibia bearing two pectinate spurs, 27(1) and 34 (1) µm long and two separated combs. Hind leg tibia bearing two pectinate spurs, 37 (1) and 41 (1) µm long and two separated combs. Lengths and proportions of legs as in Table 1.

Hypopygium ( Fig. 1 ): Tergite IX without apical and median setae. Anal tergal bands separated (V-type). Anal point 40–48 µm long, with 4 long lateral setae on each side; anal crests absent. Superior volsella semi quadrate with rounded posterior projection, 6 setae on dorsal surface and 1 ventral seta on anterior margin. Digitus finger-like, extending slightly beyond median margin of superior volsella. Median volsella short, 16 µm long with several simple setae. Inferior volsella 93 µm long, straight. Gonocoxite 769–774 µm long; gonostylus 106–111 µm long; hypopygium ratio (HR) 0.64–0.68.

Pupa and larva. Unknown.

Remarks. T. angelae sp. n. is related to some Neotropical species reviewed by Sanseverino (2006) thanks to the absence of anal crests. It resembles T. fastigatus Reiss, 1972 by the possession of lateral setae on anal point, but differs by the anal tergal bands, which is not of V-type but join in the middle of tergite in T. fastigatus . T. angelae is also related to T. jatai Trivinho-Strixino et al. 2015 by the presence of lateral setae on anal point, but it is separated by the absence of a small triangular subapical lateral projection at apex of the anal point, which is otherwise present in T. jatai . The shape of superior volsella are sufficient to differentiate these three species.

The type materials were collected with Shimabukuro´s trap (on a rock constantly wet by a fountain and on small rocky pool) at approximately 2,000 meters a.s.l.

Figures

FIGURE 1. Tanytarsus angelae sp. n. Hypopygium, left dorsal view, right dorsal view, tergite IX removed.