Ochrotrichia froehlichi Desidério, Moreno & Hamada, 2023

Desidério, Gleison Robson, Moreno, Lucas, Carvalho, Bruna Laise, Alves, André Almeida, Pes, Ana Maria & Hamada, Neusa, 2023, Filling distribution gaps and honoring great taxonomist mentors: three new species of the microcaddisfly Ochrotrichia Mosely, 1934 (Trichoptera: Hydroptilidae) from the Brazilian Cerrado and a checklist from Brazil, Revista Brasileira de Entomologia (e 20230069) 67, pp. 1-10 : 3

Ochrotrichia froehlichi Desidério, Moreno & Hamada , sp. nov.

urn:lsid:zoobank.org:act:0A4BB65B-61CE-4DBF-B25C-319BEAA7E7D0

( Figs 2A–E & 3A–I )

Differential diagnosis. This new species is clearly a member of the O. aldama group by having elongated inferior appendages, with black peg-like setae mostly at the apex, and a simple divided tergum X. Ochrotrichia froehlichi sp. nov. is most similar to O. priapo Souza, Santos and Takiya, 2014 by tergum X, elongated and apically divided into two processes, the left one chelated and the right one almost straight; and by the presence of one small, subtriangular subapicolateral process on the phallus.However, in the new species the segment IX, in ventral view, is long, about 1/2 the length of inferior appendage, while in O. priapo it is very short, about 1/4 the length of this structure. Additionally, in O. froehlichi sp. nov. the inferior appendage, in lateral view, has an almost straight dorsal margin and a rounded apex, whereas in O. priapo it has an undulated dorsal margin and a slightly truncated apex. Finally, O. froehlichi sp. nov. can be distinguished from all other congeners by the tergum X with sinuous, ribbon-shaped apodeme along its entire length and inferior appendages bearing two clusters of medium-sized spines on the inner margin (one thicker at 1/3 basal and another basally).

Description. Adult male. Total body length 2.80 mm (n = 1) ( Fig.2A ); forewing length 2.36 mm (n = 1). General color yellowish brown (in alcohol) ( Fig. 2A ). Head with three ocelli; dorsally with two pairs of setal warts; ocellar pair appressed on midline, each subtriangular; posterolateral pair large, ellipsoid ( Fig.2C ). Metascutellum subpentagonal ( Fig. 2B ). Forewing with forks I, II, III; discoidal cell absent; R 3 fused with basal ¾ of R 4+5; M 1+2 partially fused with subapical portion of R 4+5; M 1 partially fused with basal 1/3 of R 5, ending on wing margin almost at level of end of R 5; M 2, completely independent of R 4+5, ending on wing margin almost at level of end of R 4; fork of M 1+2 and M 3+4 near origin of independent R 3; r and r-m crossveins present ( Fig. 2D ). Hind wing with forks II and V; C with row of short spines on proximal region; R 2+3 originating midway between origins of R 1 and R 4+5; base of M 1+2 not fused to R, branching from M 3+4 near middle of wing; and Cu1 subdivided apically into 2 branches ( Fig.2E ). Tibial spur formula 0, 3, 4. Abdominal sternum VII with oblique mesoventral process ( Fig. 3C ).

Male genitalia. Segment IX, in lateral view,with upper anterolateral margin slightly concave, mesoventrally produced; upper posterolateral margin slightly produced posterad ( Fig.3A, D ); in dorsal view, with deep subquadrangular cleft posteriorly ( Fig.3F ); in ventral view, subrectangular ( Fig. 3H, I ). Tergum X, in lateral view, triangular, 2/3 as long as inferior appendages,apically bearing two strong acute processes:left one directed dorsad and right one claw-shaped directed ventrad ( Fig. 3A–B, D ); in dorsal view, narrow, with long, slightly sclerotized, subpentagonal base, bearing sinuous, ribbon-shaped apodeme along its entire length, apically divided into two sclerotized processes; without basodorsal process or projection; apex with deep U-shaped cleft mesally and lateral, pointed lobes ( Fig.3F ). Inferior appendage, in lateral view, oblong; 3.5X as long as wide, apically rounded ( Fig. 3A, D ); in dorsal view, surpassing tergum X, with inner surfaces bearing numerous short, dark, peg-like setae grouped subapically and on the mid-basal ridge ( Fig. 3F ); in ventral view, with two clusters of medium-sized spines on inner margin: (i) row of mesal, thick spines at 1/3 basal; (ii) cluster of thin spines basally ( Fig. 3H, I ). Phallus simples, tubular, 3× longer than inferior appendages, thread-like, subapicolaterally with a pair of large semimembranosus flaps and another pair of small triangular process ( Fig. 3E, G ).

Holotype. Male. BRAZIL: Federal District: Brasília, Fazenda Água Limpa ( FAL), Córrego Gama (#03- DF), 15°57’17.7”S, 47°57’46.0”W, 1071 m, 17−19.vi.2017, N. Hamada, G. R. Desidério, G. Amora legs., Pennsylvania trap ( INPA ) . Paratype: Same data as for holotype, 1 male ( MNRJ) .

Etymology. The new species is named in honor of Prof.Dr.Claudio Gilberto Froehlich (Universidade de São Paulo, Brazil) in recognition of his contributions to the study of the Neotropical aquatic insects, especially stoneflies (Plecoptera).

Distribution. BRAZIL: Cerrado biome (Federal District) ( Fig. 1 ).

Figures

Figure 1 Geographical distribution map of the new species of Ochrotrichia with their respective states and hydrographic basins in Brazil.

Figure 2 Ochrotrichia froehlichi sp. nov., holotype, ♂ (INPA).A, lateral habitus;B, head and thorax, dorsal view; C, head, dorsal view;D, forewing,right dorsal view; E, hind wing, right dorsal view. Cephalic setal warts abbreviations: Lateral ocellus = l. oc.; median ocellus = m. oc.; occipital setal wart = occ. wt.; vertexal ocellar setal wart = v. oc. wt. Scale bars: 0.5 mm (A); 0.2 mm (B, C, D, E).

Figure 3 Ochrotrichia froehlichi sp. nov. A, genitalia, left lateral; B, tergum X, left lateral; C, mesoventral process of segment VII,left lateral;D, genitalia, left lateral (photograph); E, phallus, left lateral; F, genitalia, dorsal; G, apex of phallus, ventral; H, genitalia, ventral; I, genitalia, ventral (photograph).Scale bars = 0.2 mm.