Rivudiva trichobasis Lugo-Ortiz & McCafferty 1998
Creators: name: Salles, F. F.
name: Nieto, C.
name: Cruz, P. V.
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Ephemeroptera
Baetidae
Rivudiva
Rivudiva trichobasis

description: Rivudiva trichobasis Lugo-Ortiz & McCafferty, 1998
Rivudiva trichobasis Lugo-Ortiz and McCafferty (1998: 64); Domínguez et al. (2006: 176); Falcão et al. (2011: 539); Cruz et al. (2011: 60); Boldrini et al. (2012: 93); Boldrini & Cruz (2014: 5).
Material examined. 1 nymph, Paratype (slide #270 IBN): BRAZIL, Rio Grande do Sul state, Arroio dos Vargas, S 30 o 50’ W 53 o 10’, 120 m. a.s.l., xi.1964, F Plaumann col. 7 nymphs, BRAZIL, Espírito Santo state, Linhares, Rio São José, S 19°07’33.1 W 40°14’26.1”, 24 m. a.s.l., 26.viii.2011, FF Salles leg. (4 UFVB, 3 IBN, 1 used for SEM images). 1 nymph, BRAZIL, Espírito Santo state, Afonso Cláudio, Cachoeira do Funil, S 20°08’35.1”, W 41°09’02.0’’, 440 m. a.s.l., 02.iii.2014, FC Massariol col. (UFVB). 19°07’33.1”S/ 40°14’261”W. 1 nymph, BRA- ZIL, Espírito Santo state, Cariacica Reserva Biológica Duas Bocas, S 20°15’28.5”, W 40°29’38.3”, 210 m. a.s.l., 02.x.2013, FC Massariol col. (UFVB).
Diagnosis
Nymph. 1) antenna with robust, apically pointed setae on scape and pedicel (Fig. 28); 2) distal margin of labrum with deep, wide, medial emargination (Fig. 23); 3) dorsal surface of labrum with irregular rows of setae (Fig. 23); 4) outer margin of mandibular incisors with spine-like processes (Fig. 29); 5) tuft on apex of lingua formed by short simple setae (as in Fig. 14); 6) maxillary palp segment I of intermediate length, reaching ⅔ of apex of galea-lacinia; 7) glossa with base not expanded, apex rounded and with dorsal thick setae mostly restricted to distal margin (as in Fig. 16); 8) hind wing pads absent; 9) trochanter with robust, long apically pointed setae; 10) outer dorsal row, medial dorsal row and inner dorsal row robust of femora with long and apically pointed setae, those of outer row almost as long as maximum width of femur (Fig. 33); 11) abdominal sterna with robust, apically pointed setae (Figs 36–37); 12) paraproct with robust, apically pointed setae and 8-10 marginal spines.
Imago (according to Cruz et al. 2011). 1) dorsal portion of turbinate eyes with inner margins not parallel, divergent anteriorly (figs 1, 2 in Cruz et al. 2011); 2) length of forewing about 3.7× width (fig. 3 in Cruz et al. 2011); 3) hind wings absent; 4) segment III of abdomen with one large medially red mark near anterior margin (figs 4, 5 in Cruz et al. 2011); 5) forceps segment III oval, 2× as long as wide (fig. 6 in Cruz et al. 2011); 6) posterior margin of subgenital plate with apex concave (fig. 6 in Cruz et al. 2011).
Distribution. Paraguay and Brazil (Rio Grande do Sul, Espírito Santo, Amazonas and Roraima) (Fig. 41).
description: Published as part of Salles, F. F., Nieto, C. & Cruz, P. V., 2020, New species of Rivudiva Lugo-Ortiz & McCafferty (Ephemeroptera: Baetidae) with comments on R. minantenna Lugo-Ortiz & McCafferty and R. trichobasis Lugo-Ortiz & McCafferty, pp. 37-52 in Zootaxa 4786 (1) on page 49, DOI: 10.11646/zootaxa.4786.1.3, http://zenodo.org/record/3990784