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