Rivudiva Lugo-Ortiz & McCafferty, 1998

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, Zootaxa 4786 (1), pp. 37-52 : 38-39

publication ID	https://doi.org/ 10.11646/zootaxa.4786.1.3
publication LSID	lsid:zoobank.org:pub:625F197D-9D26-4B00-AF3E-3045586ECB07
DOI	https://doi.org/10.5281/zenodo.4328822
persistent identifier	https://treatment.plazi.org/id/038B87F6-A576-1F6A-0AED-B430BC80548A
treatment provided by	Felipe
scientific name	Rivudiva Lugo-Ortiz & McCafferty, 1998
status

Treatment

Rivudiva Lugo-Ortiz & McCafferty, 1998 View in CoL

Diagnosis

Nymph. 1) maxillary palp long and robust, segment I almost as long as length of galea-lacinia or even longer, and segment II with short pointed distal projection ( Figs 5 View FIGURES 1−6 , 15 View FIGURES 11−16 , 24 View FIGURES 22−29 ); 2) ventral canine of maxilla laterally expanded ( Figs 26–27 View FIGURES 22−29 ); 3) lingua sub-quadrangular, apex with tuft of setae ( Figs 4 View FIGURES 1−6 , 14 View FIGURES 11−16 ); 4) glossa oblong, with conspicuous stout setae on inner or distal margin ( Figs 6 View FIGURES 1−6 , 16 View FIGURES 11−16 ); 5) segment II of labial palp with rounded inner medial protuberance, segment III conical ( Figs 6 View FIGURES 1−6 , 16 View FIGURES 11−16 ); 6) femora with distinct robust, usually long setae on outer margin, inner margin, and on a longitudinal row on dorsal and ventral surface ( Figs 7 View FIGURES 7−10 , 17, 19 View FIGURES 17−21 , 30–33 View FIGURES 30−37 ); 7) tarsal claws with two rows of denticles ( Figs 8 View FIGURES 7−10 , 18 View FIGURES 17−21 , 34, 35 View FIGURES 30−37 ); 8) hind wing pads present or absent.

Imago. 1) marginal intercalaries of fore wing double; 2) hindwings present or absent, when present with two longitudinal veins and with costal projection pointed, placed in the basal fourth of anterior margin; 3) forceps with distal segment long, about 2× as long as wide; 4) fusion of first and second segment of forceps on basal third; 5) distal margin of subgenital plate with shallow emargination or with small pointed projection.

Distribution. Neotropical, until now restricted to South America in the following countries: Brazil, French Guiana, Paraguay, and Venezuela.

Key to the species in the nymphal stage

1. Abdominal sterna with robust, apically pointed setae ( Figs 36–37 View FIGURES 30−37 ); hind wing pads absent........................... 2

1’. Abdominal sterna with simple setae; hind wing pads present................................................... 3

2(1). Scape and pedicel with apically pointed setae ( Fig. 28 View FIGURES 22−29 ); fore tarsus without long setae..................... R. trichobasis View in CoL

2’. Scape and pedicel without apically pointed setae; fore tarsus with long setae.................... R. oonirikoperi , sp. nov.

3(1’). Setae on dorsum of fore femur long (as long as maximum width of femur) and apically pointed ( Fig. 32 View FIGURES 30−37 )..... R. minantenna View in CoL

3’. Setae on dorsum of fore femur short (at most ⅓ maximum width of femur) and apically blunt ( Figs 7 View FIGURES 7−10 , 30, 31 View FIGURES 30−37 ).................................................................................................... R. inma , sp. nov.