Traverella maranhensis Nascimento & Lima & Azevêdo 2019, sp. nov.
Creators: name: Nascimento, Stênio R. S.
name: Lima, Lucas R. C.
name: Azevêdo, Carlos A. S.
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Ephemeroptera
Leptophlebiidae
Traverella
Traverella maranhensis

description: Traverella maranhensis sp. nov.
(Figs. 2 A–E, 3A–E)
Diagnosis. The male imago can be separated from all other species by the following combination of characters: (1) vein ICu 1 of fore wings free basally (Fig. 3A); (2) subgenital plate forming two lateral, broad projections with two fine, long spines dorsally recurved (Figs. 2D, 3E); (3) penis lobe divided on distal ¾ (Figs. 2D, 3D); (4) penis lobe triangular and apically rounded, with a ventral and long spine slightly curved and directed to midline (Figs. 2D, 3D).
Description. Male imago. (In alcohol). Length: body, 5.8–6.5 mm; forewing, 6.5–6.6 mm; hind wing, 1.0– 1.1 mm.
Head. Dorsal region brown with dark brown marks (Fig. 2A); ventral region whitish. Upper portion of compound eye orangish brown, lower portion black (Fig. 2C); ocelli whitish, surrounded by dark brown (Fig. 2A). Antenna. Scape and pedicel light brown, flagellum yellowish (Fig. 2A).
Thorax. Pronotum light brown washed with black, with medial strip, submedial mark and lateral margin black; mesonotum brown, except for mediolongitudinal, medioparapsidal and lateroparapsidal sutures yellowish, scutoscutellar impression whitish (Fig. 2B); metanotum light brown; pleurae yellowish brown with sclerites dark brown (Fig. 2C); sterna brown, prosternal carina narrow. Wings (Figs. 3 A–C). Membrane hyaline, brown at base. Forewing with longitudinal veins yellowish and cross veins translucent, vein ICu1 of fore wing free basally (Fig. 3A); hind wing with membrane hyaline, except base brown, longitudinal and cross veins translucent, vein C brown in basal third (Figs. 3 B–C). Legs. Legs yellowish; coxae yellowish brown with apical dark brown band; Leg I-II femur and tibia light brown with apical dark brown band; Leg III femur with apical dark brown band.
Abdomen. Tergum I black; terga II–VI translucent, posterior margins of terga III–VI each with dark brown transversal band interrupted laterally; terga VII–IX brown, with terga VII washed with black; tergum X yellowish (Figs. 2 B–C). Sterna I–VI translucent; VII–IX brown. Genitalia (Figs. 2 D–E, 3D–E). Subgenital plate light brown, posteriorly with pair of lateral broad projections, each with fine and long spine dorsally recurved (Figs. 2D, 3E). Forceps. Forceps whitish, segment II 0.2 length of segment I and 1.2 length of segment III. Penis fused on basal ¼, each lobe laterally straight and apically rounded, with small ventral projection at apex; apical region with long triangular ventral spine, slightly curved, with base widened and abruptly tapering at apex (Figs. 3 D–E); penis lobe whitish; spine light brown. Caudal filaments whitish, apical region of each segment with dark brown band.
Female imago. Unknown
Nymph. Unknown
Etymology. The specific epithet is a reference to Maranhão, the name of the state where the species was found.
Material examined. HOLOTYPE: male imago, BRAZIL, Maranhão State, National Park Chapada das Mesas, Farinha River, Cachoeira da Prata Waterfall, S06°59’37.8”, W47°09’58.1”, 201m, 17.v.2018, Lima, LRC; Nascimento, SRS cols. (UFVB). PARATYPES: Male imago, BRAZIL, Maranhão State, Pé da Serra, Itapecuru River, S05°07’28.51”, W43°33’02.26”, 60m, 01.ii.2014, Nascimento, SRS; Gomes, GRD; Sousa, DC cols. (MZUESC); seven male imagoes, same data except, 19-20.xii.2017, Nascimento, SRS; Sousa, DC; Jesus, JIS; Almeida, MAG cols. 10 male imagoes, same data except, 21.xi.2018, Nascimento, SRS col. (UFVB).
Discussion. The new species seems to belong to the subgenus Zonda because it presents free basal vein ICu 1 in the forewing and styliger plate with a pair of lateral broad projections. Regarding the wings and abdominal terga color pattern, the new species is similar to T. (Z.) calingastensis Domínguez, 1995. However, it can be distinguished from it and the other species by differences in the male genitalia. The styliger plate shows two lateral broad projections posteriorly, with two fine, long spines dorsally recurved. Traverella albertana (McDunnough, 1931), T. longifrons Lugo-Ortiz & McCafferty, 1996 and T. presidiana (Traver, 1934) have similar spines, but they do not leave from a pair of broad projections as in the new species. Each lobe of the penis presents a small ventral projection at the apex, besides a long triangular ventral spine, slightly curved, with the base widened and abruptly tapering at the apex. This penis is unusual for the genus; others usually have thin, straight spines (as in T. calingastensis) or sinuous (as in T. insolita), and no small ventral projection at apex.
description: Published as part of Nascimento, Stênio R. S., Lima, Lucas R. C. & Azevêdo, Carlos A. S., 2019, A new species of Traverella Edmunds, 1948 (Ephemeroptera: Leptophlebiidae) from Brazil, pp. 195-199 in Zootaxa 4619 (1) on pages 196-197, DOI: 10.11646/zootaxa.4619.1.12, http://zenodo.org/record/3248425