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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Oxyethira (Dactylotrichia) guariba

sp. nov.

Oxyethira (Dactylotrichia) guariba  sp. nov.

Fig. 4A –4View 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. 4AView FIGURE 4).

Male genitalia: Segment VIII annular, covered with setae; sternum with deep and wide posteromesal incision truncate anteriorly ( Fig. 4AView FIGURE 4); tergum subrectangular, posterior margin with shallow V-shaped posteromesal incision ( Fig. 4View 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. 4View 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. 4View FIGURE 4 B, 4C); tergum reduced. Inferior appendages elongate, darkened apically ( Fig. 4AView FIGURE 4); in ventral view fused basally to sternum IX, straight, and digitiform ( Fig. 4AView FIGURE 4); in lateral view subrectangular, with nearly same width throughout, blunt apically ( Fig. 4View 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, 4View FIGURE 4 B); in lateral view convex dorsally and shorter than inferior appendages ( Fig. 4View FIGURE 4 C). Bilobed process with lateral lobes slender, curved caudomesad in ventral and dorsal views, and each with small apical seta ( Figs. 4A, 4View 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. 4View 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 


Algonquin Provincial Park