Oxyethira (Tanytrichia)

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: 500-503

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-FFB6-AC5C-E7E8-04BCFDD94C7C

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scientific name

Oxyethira (Tanytrichia)
status

 

Oxyethira (Tanytrichia)  una

Fig. 11A–11View FIGURE 11 D

Description. Holotype. Length 2.0 mm. General color pale brown (in alcohol). General pattern of Neotropical Oxyethira  . Sternum VII with posterior mesoventral process ( Fig. 11AView FIGURE 11).

Male genitalia: Segment VIII annular, covered with setae; sternum VIII completely divided longitudinally, posterolateral margins widely separated and narrowing to apices ( Fig. 11AView FIGURE 11); tergum VIII with deep median incision, wide and divergent posteriorly, narrow anteriorly, almost reaching anterior margin of segment ( Fig. 11View FIGURE 11 B). Segment IX retracted in segment VIII, sternum IX produced anteriorly into middle area of segment IV, with anterior margin truncate ( Figs. 11A, 11View FIGURE 11 B); in lateral view, produced into dorsal process inside segments VII and VIII, abruptly angled about 90° subapically, directed posterad ( Fig. 11View FIGURE 11 C); tergum reduced. Inferior appendages short, apices darkened ( Fig. 11AView FIGURE 11); fused to the segment IX basally and to each other, straight, digitiform apically ( Fig. 11AView FIGURE 11); in lateral view, narrowing to apex ( Fig. 11View FIGURE 11 C). Subgenital plate conspicuous, produced into elongate, tapered medial process dorsally, about as long as inferior appendages; in ventral view, with two round anterolateral lobes basally; in dorsal view, medial process covering anterolateral lobes. Bilobed process with pair of elongate, slender processes, each with small apical seta ( Fig. 11View FIGURE 11 B). Tergum X membranous. Phallus simple, slender, and sinuous, without spines or processes; ejaculatory duct indistinguishable ( Fig. 11View FIGURE 11 D).

Remarks. Although most similar to other Tanytrichia species due to the elongate sternum IX, reaching into segment IV, the new species lacks the lateral processes of the phallus. Oxyethira  una sp. nov. has the phallus simple, sinuous, without spines or processes. Among the species in this subgenus, the new species is most similar to O. paritentaculata Kelley 1983  and O. colombiensis Kelley 1983  in that these species also have segment IX projecting dorsad and abruptly bent caudad in lateral view. Oxyethira  una sp. nov. can be identified by the subgenital plate bearing an elongate process with a digitiform apex and by the simple structure of the phallus.

Etymology. The specific name is given in reference to the type-locality.

Material examined. Holotype. BRAZIL: 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