Oecetis capixaba, Bonfá-Neto & Salles & Vilarino, 2024

Bonfá-Neto, Pedro, Salles, Frederico Falcão & Vilarino, Albane, 2024, New species of the long-horned caddisfly Oecetis McLachlan, 1877 (Trichoptera: Leptoceridae) from the Atlantic Forest, Brazil and their evolutionary relationship, Arthropod Systematics & amp; Phylogeny 82, pp. 551-566 : 551-566

Oecetis capixaba sp. nov.

Figure 3 A – F

Type material.

Holotype: BRAZIL • ♂; Espírito Santo, Santa Teresa, Augusto Ruschi biological reserve, Córrego Roda d’Água ; 19 ° 53 ′ 35.1 ″ S, 40 ° 32 ′ 39.7 ″ W; 810 m a. s. l.; 24 Aug. – 30 Sep. 2017; Malaise trap; FF Salles, V Costa, P Bonfá Nt leg.; UFVB TR 00336 .

Diagnosis.

This new species is similar to the other species of the falicia group with spine-like setae on the inner surface of the inferior appendage, being very similar to Oecetis achanthostema by both presenting a spiny process on the phalloteca. They can be differentiated by the dorsolateral process of segment IX in dorsal view being wide subapically in O. achanthostema , while it is tapered and overall narrow in the new species. The spine-like setae on the inferior appendage are conspicuously longer in the new species than in O. achanthostema . Additionally, the phallic apparatus of O. achanthostema has two digitate apical projections, which are absent in O. capixaba sp. nov.

Description.

Adult male: Forewing length 6.8 mm (n = 1). Head. Color pale light yellow (in alcohol). Antennae approximately 3 x forewing length; scape stout, elongate; pedicel enlarged in width, narrower than scape, shorter than first flagellomeres; first flagellomere narrow, with same length as scape, other flagellomeres shorter than first. Maxillary palps pale light yellow, 5 - segmented, segments subequal in length and width, densely covered with setae. Labial palps pale light yellow, apparently 4 - segmented, first segment very small. Thorax. Pterothorax yellowish brown; forewing pale light yellow; dark bands over cord absent (Fig. 3 A ); dark spots absent; forks I sessile and fork V rooted (Fig. 3 A ); sectoral crossvein (s) not aligned with r – m (Fig. 3 A ). Hind wing with forks I and V present (Fig. 3 B ); false vein near Cu 1 a (Fig. 3 B ). Legs pale yellow brown, mid leg with longitudinal row of spines on tibia and tarsal segments. Tibial spur formula 1, 2, 2, fore tibial spur small. Genitalia (Fig. 3 C – F ). Segment IX in lateral view annular, short, bearing pair of dorsolateral processes; processes slender, bent ventrad, cylindrical, tapering posteriorly, same length as phallic apparatus; two acrotergite present dorsolaterally (Fig. 3 C, D ). Preanal appendage short and narrow, digitate, setose (Fig. 3 C, D ). Tergum X, in lateral view, divided into dorsal and ventral lobes; dorsal lobe, single, cylindrical, digitate, slightly larger than the length of the ventral lobe, with short apical setae (Fig. 3 C, D ); ventral lobe divided mesally by V-shaped incision, forming two lobes, each broad basally, tapering to acuminate apex (Fig. 3 C, D ). Inferior appendage 1 - segmented, broad at base, setose; distal lobe long, narrow, tapering posteriorly, apex rounded, with short, stout spine-like setae present on inner surface (Fig. 3 D, E ); ventral lobe, in lateral view, quadrate (Fig. 3 C, E ); dorsal lobe reduced (Fig. 3 D ). Phallic apparatus bilaterally asymmetrical, bent ventrad, cylindrical, elongate, membranous apically, with posterolateral spine projection on right side (Fig. 3 F – H ); apex elongate, in caudal view (Fig. 3 H ); phallic spines absent (Fig. 3 F, G ); phallotremal sclerite absent (Fig. 3 G ).

Etymology.

The specific epithet “ capixaba ” is a name originating from the Tupi language, meaning “ farmland ”, “ a land clean for planting ”, and it is currently used to designate people born in the state of Espírito Santo. Species named in apposition.

Figures

Figure 3. Oecetis capixaba sp. nov., holotype, male (UFVB TR 00336). Venation: A forewing, B hind wing. Genitalia: C dorsal, D right lateral, E ventral. Phallus: F right lateral, G dorsal, H caudal.