Takiya et al. 2016 : 170 Taxonomic study of the genus Oxyethira Eaton 1873 (Trichoptera: Hydroptilidae) from Northeast Brazil: Eleven new species and distributional records De Souza, Wagner Rafael M. Santos, Allan Paulo Moreira Zootaxa 2017 4236 3 484 506  Takiya et al. 2016 : 170 [151,621,695,721] Insecta Hydroptilidae Oxyethira Animalia Trichoptera 14 498 Arthropoda species septentrionalis sp. nov. Tanytrichia     Oxyethirasp. 1  Takiya et al.2016: 170  Description. Holotype.Length 2.0 mm. General color pale brown (in alcohol). General pattern of Neotropical  Oxyethira. Sternum VII with small posterior mesoventral process ( Figs. 9A, 9C). Male genitalia: Segment VIII annular, covered with setae; sternum VIII with U-shaped posteromesal incision ( Fig. 9A); tergum VIII excavated medially, excavation partially enclosed with two mesolateral lobes with long setae ( Fig. 9B). Segment IX retracted in segment VIII, sternum IX produced anteriorly into anterior area of segment VI, with anterior margin rounded, nearly truncate ( Figs. 9A, 9B); in lateral view, produced dorsad near posterior end. Inferior appendages short and square, with darkened apices; fused to sternum IX and to each other basally ( Fig. 9A); in lateral view, hidden by segment VIII. Subgenital plate inconspicuous; in ventral, dorsal, and lateral views covered by segment VIII ( Figs. 9A, 9B, 9C); in lateral view curved posterodorsad, slender, shorter than inferior appendages ( Fig. 9C). Bilobed process with short processes, each with small apical seta ( Figs. 9A, 9C). Tergum X membranous. Phallus divided into basal and distal portions; basal portion tubular, longer than distal portion; distal portion sclerotized on right side, sclerotization subtriangular, with elongate spine-like process arising at mid-length of left side; ejaculatory duct not protruding ( Fig. 9D).   Remarks.This species is placed in the subgenus Tanytrichiadue to segment IX reaching segment IV. However, the short, fused inferior appendages and the general aspect of the segment IX is more similar to the Loxotrichiaspecies.  Oxyethira septentrionalis  sp. nov.is most similar to  O. sencilla Holzenthal & Harris 1992, both having tergum VIII excavated and forming two mesolateral lobes, short inferior appendages, and the subgenital plate inconspicuous and covered by segment VIII. The new species can be distinguished by the phallus being divided into basal and distal portions, with the distal portion having a long spine-like curved process at midlength.   Etymology.The specific name is a reference to the type-locality, one of the most northern region of Brazil. The word  septentrionalisis a Latin adjective meaning “northern”.     Materialexamined. Holotype. BRAZIL: Piauí: Piracuruca,  Parque Nacional de Sete Cidades, alojamento, 4°05'57''S, 41°42'34''W,  193 m,  20.vi.2012, DM Takiyacol., light trap, 1 ♂( CZMA). Paratypes.Same data as holotype, 1 ♂, (CZMA).  Samedata as holotypeexcept by,  Poço da Bananeira, 4°05'56''S, 41°40'34''W,  189 m,  19.iv.2012, 1 ♂( DZRJ).  Samedata as holotypeexcept cachoeira do Riachão, 4°06'58''S, 41°40'13''W,  171 m,  18.iv.2012, 13 ♂( DZRJ). 1437078920 2012-06-20 CZMA Parque Nacional de Sete Cidades & DM Takiya Brazil Material 193 -4.099167 Parque Nacional de Sete Cidades 21 -41.709446 Piracuruca 14 498 1 1 Piaui holotype 1437078933 2012-04-19 DZRJ Poco da Bananeira Brazil 189 -4.098889 Poco da Bananeira 21 -41.676113 Same 14 498 1 1 Piaui holotype 1437078944 2012-04-18 DZRJ Brazil 171 -4.116111 Riachao 21 -41.67028 Same 14 498 13 13 Piaui holotype