Ochrotrichia machadoi Desidério, Moreno, Carvalho & 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 : 3-5

Ochrotrichia machadoi Desidério, Moreno, Carvalho & Hamada , sp. nov.

urn:lsid:zoobank.org:act:538B87A6-5D74-4D14-989F-8B17869C00BC ( Figs 4A–E & 5A–I )

Differential diagnosis. Ochrotrichia machadoi sp. nov. belongs to the O. xena group by having elongated, simple, tergum X. It is most similar to O. belodes Moreno, Desidério, Pes and Hamada, 2021 by the shape of the inferior appendage in lateral view, oblong, long (3.5X as long as wide) and apex rounded with inner surfaces bearing numerous slender, dark, peg-like setae grouped subapically. However, in O. belodes the tergum X has a pair of sclerotized claw-like basodorsal process, which is absent in O. machadoi sp. nov. Although both species present the tergum X subsagittate to sagittate in dorsal view, the apex is pointed directed on left side, whereas it is pointed directed posterad in O. belodes . Furthermore, O. machadoi sp. nov. can be recognized by having only two clusters of spines on the inner surfaces of the inferior appendages, while O. belodes has three clusters.

Description. Adult male. Total body length 2.16 mm (n = 1) ( Fig. 4A ); forewing length 1.85 mm (n = 1). General color yellowish brown (in alcohol) ( Fig. 4A ). Head with three ocelli; dorsally with two pairs of setal warts; ocellar pair closely appressed on midline, each subtriangular; posterolateral pair large, ellipsoid ( Fig.4C ). Metascutellum subpentagonal ( Fig. 4B ). Forewing with forks I, II, III present; 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 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 branching from each other near origin of independent R 3; r and r-m crossveins present ( Fig. 4D ). Hind wings 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 Cu 1 subdivided apically into 2 branches ( Fig.4E ). Tibial spur formula 0, 3, 4. Abdominal sternum VII with pointed mesoventral process ( Fig. 5C ).

Male genitalia. Segment IX,in lateral view, with upper anterolateral margin slightly concave, mesoventrally produced; upper posterolateral margin slightly produced posterad ( Fig. 5A, D ); in dorsal view, with U-shaped cleft posteriorly ( Fig. 5F ); in ventral view, subquadrangular ( Fig. 5H, I ). Tergum X, in lateral view, subtriangular, 2/3 as long as inferior appendages, bearing one subapical acute process on the left side directed posteroventrad, apically with shallow cleft and subacute process directed lateroventrad ( Fig. 5A–B, D ); in dorsal view, narrow, not divided, subsagittate, with slightly sclerotized base bearing ventral, stick-shaped apodeme at midlength; without basodorsal process or projection; apex strongly sclerotized, pointed directed on left side ( Fig.5F ). Inferior appendage, in lateral view, oblong; 3.5X as long as wide, apically rounded ( Fig. 5A, D ); in dorsal view, surpassing tergum X, with inner surfaces bearing numerous slender, dark, peg-like setae grouped subapically ( Fig. 5F ); in ventral view, with row of 5–9 medium-sized, thick spines at 1/3 basal on inner margin ( Fig. 5H, I ). Phallus simple, tubular, 3.2x longer than inferior appendages, thread-like ( Fig. 5E, G ). Holotype. Male. BRAZIL: Tocantins: Palmas , Parque Estadual do Lajeado , Igarapé da Onça (#01-TO), 10°06′44.50″S, 48°15′31.10″W, 596 m, 28.xii.2017, J. O. Silva, G. Amora legs., Malaise trap ( INPA ). Paratypes: Same data as for holotype, 1 male ( MNRJ), 1 male ( DZRJ); same collection data as for preceding, except 30.i.2018, 1 male ( INPA ), 1 male ( UFBA). Etymology. This new species is named in memory of the late Prof. Dr.Angelo Barbosa Monteiro Machado (1934-2020) (Universidade Federal de Minas Gerais, Brazil) in recognition of his contributions to the study of the Neotropical aquatic insects, especially dragonflies (Odonata) .

Distribution. BRAZIL: Cerrado biome (Tocantins 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 4 Ochrotrichia machadoi 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. Scale bars: 0.5 mm (A); 0.2 mm (B, C, D, E).

Figure 5 Ochrotrichia machadoi 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 (A, B, D, E, F, G, H, I); 0.05 mm (C).