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 [151,579,339,365] Insecta Hydroptilidae Oxyethira Animalia Trichoptera 11 495 Arthropoda species gracilianoi sp. nov. Loxotrichia   Description. Holotype.Length 2.2 mm. General color pale brown (in alcohol). General pattern of Neotropical  Oxyethira. Sternum VII with small posterior mesoventral process ( Figs. 7A, 7C). Male genitalia: Segment VIII annular, covered with setae; sternum completely divided longitudinally ( Fig. 7A); tergum with posterior margin with deep V-shaped notch ( Fig. 7B). Segment IX retracted in segment VIII, sternum IX produced anteriorly, reaching into posterior area of segment VII, narrowing anteriorly ( Figs. 7A, 7C); in lateral view with small projection directed dorsally ( Fig. 7C); tergum reduced. Inferior appendages short; fused to sternum IX basally, apices darkened and digitiform ( Fig. 7A); in lateral view narrowing at apex, curved slightly dorsad ( Fig. 7C). Subgenital plate conspicuous, broad; with pair of elongate processes directed anterolaterad, recurved posteromesad and crisscrossing posteromesally, protruding beyond posterior margins of segment VIII, eachprocess bearing subapicomesal spine directed anteromesad ( Fig. 7B). Bilobed process with short lobes fused to each other basally, each with small apical seta ( Fig. 7B). Tergum X membranous. Phallus simple, tubular, somewhat enlarged basally, with apex divided into two small acute lateral processes above membranous apical lobe offset to right; ejaculatory duct protruding between lateral processes ( Fig. 7D).   Remarks.This species is assigned to the subgenus Loxotrichiadue to the short inferior appendages with digitiform apices.  Oxyethira gracilianoi  sp. nov.is most similar to  Oxyethira singularis  sp. nov.due to the presence of a pair of processes on the subgenital plate. However, the new species is easily distinguished from  O. singularisand all other  Oxyethiraspecies by this pair of elongate processes, which crisscross posteriorly, and each bearing a subapicomesal spine directed anteromesad.   Etymology.The new species is named in memory of Graciliano Ramos ( 1852–1953). Graciliano was author of such Brazilian classic literature as “Caetés” (1933) and “Vidas Secas” (1938). Graciliano was born in the city of Quebrangulo, typelocality of this new species.     Materialexamined. Holotype. BRAZIL: Alagoas: Quebrangulo,  Reserva Biológica de Pedra Talhada, rio Caranguejoacima do alojamento, 9°15'26''S, 36°25'07''W,  21-28.vi.2014, APM Santos, DMTakiya, AC Domahovski& WRM Souzacols., Malaise, 1 ♂( DZRJ).   Paratypes. Samedata as holotypeexcept afluente do rio Caranguejo, 9°13'57''S, 36°26'52''W,  20.vi.2014, light trap, 1 ♂( DZRJ);   Bahia: Una,  Reserva Biológica de Unariacho de 1ª ordem após a fazenda Piedade, 15°09'36''S, 39°10'31''W,  14.vi.2014, APM Santos, DMTakiya, AC Domahovski, APPinto & WRM Souzacols., light trap, 1 ♂( DZRJ). 1437078963 2014-06-21 2014-06-28 2014-06-21 APM, DZRJ Reserva Biologica de Pedra Talhada & Santos, DM & AC Domahovski & Souza & Malaise Brazil Material -9.257222 Reserva Biologica de Pedra Talhada 21 -36.418613 Quebrangulo 11 495 1 1 Alagoas holotype 1437078981 2014-06-20 DZRJ Brazil -9.232499 rio Caranguejo 21 -36.44778 Same 11 495 1 1 Alagoas paratype 1437079002 2014-06-14 APM, DZRJ Reserva Biologica de Una & Santos, DM & AC Domahovski, AP & Souza Brazil Una -15.16 Piedade 21 -39.175278 Reserva Biologica de Una 11 495 1 1 Bahia paratype