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

publication ID

https://doi.org/10.11646/zootaxa.4236.3.4

publication LSID

lsid:zoobank.org:pub:C034B77B-BCC0-46FA-9541-12229A053852

persistent identifier

http://treatment.plazi.org/id/4B1B3448-FFAD-AC44-E7E8-0141FC3048D5

treatment provided by

Plazi

scientific name

Oxyethira (Loxotrichia) gracilianoi
status

sp. nov.

Oxyethira (Loxotrichia) gracilianoi  sp. nov.

Fig. 7A–7View FIGURE 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, 7View FIGURE 7 C).

Male genitalia: Segment VIII annular, covered with setae; sternum completely divided longitudinally ( Fig. 7AView FIGURE 7); tergum with posterior margin with deep V-shaped notch ( Fig. 7View FIGURE 7 B). Segment IX retracted in segment VIII, sternum IX produced anteriorly, reaching into posterior area of segment VII, narrowing anteriorly ( Figs. 7A, 7View FIGURE 7 C); in lateral view with small projection directed dorsally ( Fig. 7View FIGURE 7 C); tergum reduced. Inferior appendages short; fused to sternum IX basally, apices darkened and digitiform ( Fig. 7AView FIGURE 7); in lateral view narrowing at apex, curved slightly dorsad ( Fig. 7View FIGURE 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. 7View FIGURE 7 B). Bilobed process with short lobes fused to each other basally, each with small apical seta ( Fig. 7View FIGURE 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. 7View FIGURE 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, APMAbout APM Santos, DM Takiya, AC Domahovski & WRM Souza cols., Malaise, 1 ♂ ( DZRJ)GoogleMaps  . 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)GoogleMaps  ; 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, APMAbout APM Santos, DM Takiya, AC Domahovski, AP Pinto & WRM Souza cols., light trap, 1 ♂ ( DZRJ)GoogleMaps  .

APM

Algonquin Provincial Park