Oxyethira (Loxotrichia) gracilianoi, De Souza, Wagner Rafael M. & Santos, Allan Paulo Moreira, 2017

De Souza, Wagner Rafael M. & Santos, Allan Paulo Moreira, 2017, Taxonomic study of the genus Oxyethira Eaton 1873 (Trichoptera: Hydroptilidae) from Northeast Brazil: Eleven new species and distributional records, Zootaxa 4236 (3), pp. 484-506 : 495

Oxyethira (Loxotrichia) gracilianoi sp. nov.

Fig. 7A–7 D

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, 7 C).

Male genitalia: Segment VIII annular, covered with setae; sternum completely divided longitudinally ( Fig. 7A ); tergum with posterior margin with deep V-shaped notch ( Fig. 7 B). Segment IX retracted in segment VIII, sternum IX produced anteriorly, reaching into posterior area of segment VII, narrowing anteriorly ( Figs. 7A, 7 C); in lateral view with small projection directed dorsally ( Fig. 7 C); 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. 7 C). 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. 7 B). Bilobed process with short lobes fused to each other basally, each with small apical seta ( Fig. 7 B). 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. 7 D).

Remarks. This species is assigned to the subgenus Loxotrichia due 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. singularis and all other Oxyethira species 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, type locality of this new species.

Material examined. Holotype. BRAZIL: Alagoas: Quebrangulo, Reserva Biológica de Pedra Talhada , rio Caranguejo acima do alojamento, 9°15'26''S, 36°25'07''W, 21-28.vi.2014, APM Santos, DM Takiya, AC Domahovski & WRM Souza cols., Malaise, 1 ♂ ( DZRJ) . Paratypes. Same data as holotype except afluente do rio Caranguejo , 9°13'57''S, 36°26'52''W, 20.vi.2014, light trap, 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, 1 ♂ ( DZRJ) .

Figures

FIGURE 7 A – 7 D. Oxyethira gracilianoi sp. nov. Male genitalia: 7 A, ventral; 7 B, dorsal; 7 C, left lateral; 7 D, phallus, dorsal.