Oxyethira (Dactylotrichia) iannuzzae sp. nov.

Fig 2A–2 D

Description. Holotype. Length: 2.4 mm. General color pale brown (in alcohol). General pattern of Neotropical Oxyethira . Sternum VII with posterior mesoventral process (Figs. 2A, 2 C).

Male genitalia: Segment VIII annular, covered with setae; sternum with deep, U-shaped posteromesal incision (Fig. 2A); tergum subrectangular with posterior margin slightly concave (Fig. 2 B). Segment IX retracted in segment VIII; anterior margin truncate and reaching anterior area of segment VI (Figs. 2A, 2 B); with pair of small midlateral processes projecting posterodorsad (Fig. 2 B), tergum reduced. Inferior appendages elongate; in ventral view, curved posterolaterad, with apices diverging, truncate, and darkened (Fig. 2A); in lateral view, curved upward (Fig. 2 C). Subgenital plate conspicuous; in ventral and dorsal views, as two lateral arms projecting obliquely anterolaterad and connected posteriorly with transverse band (Figs. 2A, 2 B); in lateral view lobate, with posterior apex curved downwards. Bilobed process with arms elongate and curved slightly mesad, each with small apical seta (Figs. 2A, 2 B). Tergum X membranous. Phallus simple, subapically with elongate, sinuous, and acute process; apex with small hook (Fig. 2 D); ejaculatory duct indistinguishable.

Remarks. This new species is tentatively placed in Dactylotrichia due to the shape of the segment IX with its anterior margin truncate and reaching the segment VI. However, this new species has apically truncate inferior appendages, whereas they are digitiform in other Dactylotrichia species. Oxyethira iannuzzae sp. nov. and O. costaricensis Kelley 1983 show a similar process in the posterior region of the phallus, but in the new species this process is subapical and the phallic apex is slightly hooked. In addition, the new species can be distinguished by sternum VIII having a wide and U–shaped posteromesal notch, and by the inferior appendages diverging with truncate apices.

Etymology. The new species is named in honor of Dra. Luciana Iannuzzi, curator of Coleção Entomológia da UFPE who provided many microcaddiflies species for this study.

Material examined. Holotype. BRAZIL: Alagoas: Quebrangulo, Reserva Biológica de Pedra Talhada, Rio Caranguejo, 2 km acima do alojamento, 9°15'03''S, 36°25'56''W, 814 m, 20.vi.2014, APM Santos, DM Takiya, AC Domahovski & WRM Souza cols., light trap, 1 ♂ (DZRJ) . Paratype. Same data as holotype, 1 ♂ (DZRJ) . Bahia: Una, Reserva Biológica de Una, riacho de 1ª ordem após a fazenda Piedade, 15°09'36''S, 39°10'31''W, 14.vi.2014, APM Santos, DM Takiya, AC Domahovski, AP Pinto & WRM Souza cols., light trap, 2 ♂ (DZRJ), 2 ♂ (CE- UFPE) .