Ochrotrichia nessimiani Desidério, Alves, 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 : 5-7

Ochrotrichia nessimiani Desidério, Alves, Moreno & Hamada , sp. nov.

urn:lsid:zoobank.org:act:ABD4B0CC-91EE-4CF1-8AB9-AA49C7732FB7

( Figs 6A–E & 7A–I )

Differential diagnosis. Ochrotrichia nessimiani sp. nov. can be designated to the O. cruces group from Flint Junior (1972) by having triangular inferior appendages, in lateral view. It is most similar to O. vieja Bueno-Soria and Holzenthal, 1998 based on the rounded apically inferior appendages, in lateral view; with inner surface bearing numerous medium-sized, dark, peg-like setae grouped subapically. However, they can be easily distinguished by the shape of the X tergum, which in the new species is apically divided into two sclerotized processes, in dorsal view, bearing left process with pointed, downturned apex, in lateral view, while in O. vieja it is divided into more processes and the left process is sinuous with rounded apex, in lateral view.

Description. Adult male. Total body length 2.90–3.20 mm (mean = 3.04 mm, SD = 0.12, n = 5) ( Fig. 6A ); forewing length 2.70–3.00 mm (n = 5). General color brown (in alcohol) ( Fig. 6A ). Head with three ocelli; dorsally with two pairs of setal warts; ocellar pair closely appressed on midline, each subtriangular; posterolateral pair large, ellipsoid ( Fig. 6C ). Metascutellum subpentagonal ( Fig. 6B ). Forewing with forks I, II, III; discoidal cell absent; R 3 fused with basal 3/4 of R 4+5; M 1+2 partially fused with subapical portion of R 4+5; M 1 distinct from mid-length of R 5; M 2 distinct from R 4+5 immediately before origin of fork II; fork of M 1+2 and M 3+4 near origin of independent R 3; r and r-m crossveins absent ( Fig.6D ). Hind wing with forks II, III and V; C with row of short spines on proximal region; R 2+3 originating near level of apex of M 1+2; 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. 6E ). Tibial spur formula 0, 3, 4. Abdominal sternum VII with pointed mesoventral process ( Fig. 7C ).

Male genitalia. Segment IX,in lateral view, with upper anterolateral margin slightly concave, mesoventrally produced; upper posterolateral margin tapering dorsally ( Fig.7A, D ); in dorsal view, with U-shaped cleft posteriorly ( Fig. 7F ); in ventral view, subhexagonal ( Fig. 7H, I ). Tergum

X, in lateral view, subtriangular, long, almost reaching midlength of inferior appendages, apex of left process with a strong downturned curvature ( Fig. 7A–B, D ); in dorsal view, subpentagonal base, apically divided into two sclerotized processes; without basodorsal process or projection; apex strongly sclerotized, left process broad, with a constriction subbasally, subtriangular at midlength, with acute apex; right process triangular, tapering to subacute apex ( Fig. 7F ). Inferior appendage, in lateral view, subtriangular; 2X as long as wide, apically rounded ( Fig. 7A, D ); in dorsal view, surpassing tergum X, with inner surfaces bearing numerous medium-sized, dark, peg-like setae grouped subapically and on the mid-basal ridge ( Fig.7F ); in ventral view, with row of 2–3 medium-sized, slender mesal spines on inner margin ( Fig.7H, I ). Phallus simples, tubular, 2.7× longer than inferior appendages, thread-like, with triangular, subapicolateral process ( Fig. 7E, G ).

Holotype. Male. BRAZIL: Minas Gerais: Jaboticatubas, Parque Nacional da Serra do Cipó, Trilha para Cachoeira da Farofa , Córrego da Farofa , 19°23’02.6”S, 43°34’49.1”W, 812 m, 06−09.i.2019, A.A. Alves, J.L. Nessimian, L.Hoehne, A.L. Henriques-Oliveira legs., Malaise trap ( DZRJ) . Paratypes: Same data as for holotype, 2 males ( DZRJ); same collection data as for preceding, except 3 males ( INPA ) ; same collection data as for preceding, except 2 males ( MNRJ) .

Etymology. This new species is named in honor of Prof. Dr. Jorge Luiz Nessimian (Universidade Federal do Rio de Janeiro, Brazil) who helped collect the type specimens and in recognition of his contributions to the study of the Neotropical aquatic insects, especially caddisflies ( Trichoptera ).

Distribution. BRAZIL: Cerrado biome (Minas Gerais state) ( Fig. 1 ).

Figures

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

Figure 6 Ochrotrichia nessimiani sp. nov., holotype,♂ (DZRJ).A, dorsal habitus;B, head and thorax,dorsal view;C, head,dorsal view;D, forewing,right dorsal view;E, hind wing, right dorsal view. Scale bars: 0.5 mm (A, D, E); 0.2 mm (B); 0.1 mm (C).

Figure 7 Ochrotrichia nessimiani 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 = 0.1 mm.