Oxyethira (Dactylotrichia) guariba, 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 : 490

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

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Oxyethira (Dactylotrichia) guariba

sp. nov.

Oxyethira (Dactylotrichia) guariba sp. nov.

Fig. 4A–4 View FIGURE 4 D

Description. Holotype. Length: 2.3 mm. General color pale brown (in alcohol). General pattern of Neotropical Oxyethira . Sternum VII with posterior mesoventral process ( Fig. 4A View FIGURE 4 ).

Male genitalia: Segment VIII annular, covered with setae; sternum with deep and wide posteromesal incision truncate anteriorly ( Fig. 4A View FIGURE 4 ); tergum subrectangular, posterior margin with shallow V-shaped posteromesal incision ( Fig. 4 View FIGURE 4 B). Segment IX retracted in segment VIII; sternum IX produced anteriorly and reaching into posterior area of segment VI, with anterior margin slightly concave, with two pair of acute posterolateral processes ( Fig. 4 View FIGURE 4 B), in lateral view, dorsal pair abruptly curved near anterior margin of segment VIII and extending posterad beyond posterior margin if segment VIII, ventral one straight, acute, and extending posterad beyond posterior margin of segment VIII ( Figs. 4 View FIGURE 4 B, 4C); tergum reduced. Inferior appendages elongate, darkened apically ( Fig. 4A View FIGURE 4 ); in ventral view fused basally to sternum IX, straight, and digitiform ( Fig. 4A View FIGURE 4 ); in lateral view subrectangular, with nearly same width throughout, blunt apically ( Fig. 4 View FIGURE 4 C). Subgenital plate conspicuous; in ventral and dorsal views with two lateral arms directed obliquely anterolaterad and connected posteriorly with transverse band, bulbous medially ( Figs. 4A, 4 View FIGURE 4 B); in lateral view convex dorsally and shorter than inferior appendages ( Fig. 4 View FIGURE 4 C). Bilobed process with lateral lobes slender, curved caudomesad in ventral and dorsal views, and each with small apical seta ( Figs. 4A, 4 View FIGURE 4 B). Tergum X membranous. Phallus broad basally, truncate apically, with slender, curved process arising on the right apicolateral corner and transversely crossing phallus subapicodorsally from right to left; ejaculatory duct indistinguishable ( Fig. 4 View FIGURE 4 D).

Remarks. This species is placed in the subgenus Dactylotrichia due to segment IX reaching segment VI internally, with two pairs of acute posterolateral processes and the inferior appendages elongate. Oxyethira guariba sp. nov. shares with O. arctodactyla Kelley 1983 the presence of two pair of lateral processes on segment IX, but in the new species the most ventral process is elongate, reaching the posterior margin of the segment VIII. The new species can be also separated from other Oxyethira species by the phallus broad being basally, and apically bearing a slender apicolateral process crossing the phallus subapicodorsally.

Etymology. The specific name is an allusion to the type-locality of this new species. “ Guariba ” is also the popular name of the monkey Alouatta belzebul ( Linnaeus 1766) which is a common species in that region.

Material examined. Holotype. BRAZIL: Paraíba: Mamanguape, Reserva Biológica Guaribas , rio Barro Branco , casa da cabeça de boi, 6°43'7''S, 35°10'55''W, 25.vi.2014, APM Santos, DM Takiya, AC Domahovski & WRM Souza cols., light trap, 1 ♂ ( DZRJ). GoogleMaps


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