Ulmeritoides nigribullae, Salles & Domínguez, 2012

Salles, F. F. & Domínguez, E., 2012, Systematics and Phylogeny of Ulmeritus-Ulmeritoides revisited (Ephemeroptera: Leptophlebiidae), Zootaxa 3571, pp. 49-65 : 56

Ulmeritoides nigribullae sp. nov.

Holotype Male Imago (in alcohol, one pair of wings and genitalia on slides). Length: body, 5.6–5.8 mm; fore wings, 6.3–6.6 mm; hind wings, 2.25 mm. General coloration orange-brownish, abdomen washed with black ( Figs. 3, 4). Head ( Figs. 3, 4): yellowish-brown, washed with black. Upper portion of eyes light brown, lower portion blackish. Ocelli white, surrounded with dark brown. Antennae brown. Thorax ( Figs. 3, 4): pronotum pale grey, tinged with white and dark brown medially, and with black on lateral margins; mesonotum pale yellowish, with whitish markings, margins and carinae brown; metanotum pale gray washed with brown; pleura orange-brown washed with black; sterna orange-brown. Wings ( Figs. 16, 17): membrane of fore wings ( Fig. 16) hyaline, wing base brown; longitudinal veins yellowish, cross-veins hyaline; 11 cross-veins basal to bulla, brownish spots on bullae of veins Sc and R 1. Membrane of hind wings ( Figs. 16b, 17) hyaline, base brown; longitudinal and crossveins hyaline. Legs: leg I brown except apex of tibia, whitish, and tarsi, lighter; femur of leg I with median black spot; legs II and III whitish, tarsi slightly tinged with brown; femur of leg II with median orange-brown spot and subapical orange-brown band; tibia of leg II with subapical brownish-black band; femur of leg III with basal and subapical orange-brown washed with black band; claws washed with brown. Abdomen ( Figs. 3, 4): terga orangebrown terga I–II completely washed with black; medial black line on terga I–IX, with anterolateral black marks on terga III–IX, as in Figs. 3, 4; sterna brown, washed with black. Genitalia ( Figs. 18, 19): styliger plate, penes, base and distolateral margin of forceps segment I light brown, remnants of forceps segment I and segments II and III yellowish. Apex of penis lobes straight, ending in rather acute apical and mesal projections. [Caudal filaments broken off and lost].

Mature nymph (in alcohol). Body length, 5.5 – 6.4 mm. General coloration: brown to dark orange-brown with black markings. Head: brown, slightly washed with black, with yellowish areas below median ocellus, whitish between lateral ocelli and compound eyes, vertex with yellowish irregular marks. Ocelli whitish with inner margins black. Eyes of male with upper portions dark orange-brown, lower portion blackish. Eyes of female blackish. Antennae: scape and pedicel light grayish-brown, flagellum translucent grayish-brown, paler toward apex. Mouthparts: labrum, mandibles, stipe, paraglossae, and first segment of maxillary and labial palpi brownish, remaining parts paler. Medial denticle on anteromedian emargination of labrum much larger than others ( Fig. 20a, b). Basal 2/3 of outer margin of mandibles with few long setae ( Fig. 21). Tusk on inner apical margin of maxillae large ( Figs. 22a, b). Labium as in Fig. 23. Thorax: nota pale yellowish-brown with blackish and yellowish markings. Pleura and sterna brownish washed with black. Legs ( Figs. 24–26). Leg I: femora brown, except base whitish and black median spot; tibia and tarsi dark brown, except apex of tibia and base and apex of tarsi whitish. Leg II: femora grayish, whitish at base with a median darker spot; tibia grayish, with subbasal and apical whitish bands, and subapical brownish marking; tarsi grayish, with subbasal brownish band. Leg III: femora brownishgray, with subbasal, subapical and median black markings; tibia and tarsi similar to leg II, except for lack of subapical blackish marking on apex of tibia. Dorsal surface of all femora with few short, pointed spines ( Figs. 25, 26). Lines of pectinate setae on ventral surface of tibia III forming one main line ( Fig. 28). Claws grayish, light brown toward apex. Abdomen: terga dark orange-brown, with blackish markings, posterolateral projections of segments VII and VIII lighter. Sterna brown washed with black. Gills gray, tracheae and fimbriae gray-violet. Caudal filaments yellowish-brown, alternating segment unions darker.

Material: HOLOTYPE: 1 male imago, BRAZIL, Minas Gerais, Parque Estadual do Rio Doce, Lagoa Carioca , 29/x/2005, F.F. Salles & C. N. Francischetti col. ( INPA) . PARATYPES: 3 male imagos, 3 nymphs, same data as holotype (1 male imago and 1 nymph at IFML, remaining in CZNC) .

Biology. Nymphs of the new species were found in packs of leaf litter in the bottom of Lagoa Carioca, a lake located in a well-preserved area of Atlantic Forest in Southeastern Brazil.

Etymology. nigribullae , after the black markings on the bullae.

Variations. In some nymphs the black bands on tibia I are more extended, covering almost all the segments, while in other the two bands are well defined.

Discussion. Ulmeritoides nigribullae sp. nov. can be separated from the other species of the genus by the following combination of characters. In the imago: 1) fore wings hyaline, base brown and with dark spots in bullae in Sc and R 1 ( Fig. 16a); 2) abdominal color pattern as in Figs. 3, 4; 3) 8–11 cross-veins basal to bulla in fore wings ( Fig. 16a); 4) penis as in Figs. 18, 19. In the nymph: 1) medial denticle on anteromedian emargination of labrum much larger than others ( Fig.20a, b); 2) tusk on inner margin of maxillae well developed ( Figs. 22a, b); 3) dorsum of femora II–III with few short, acute spines ( Figs. 25, 26); 4) femora II with medial darker spot ( Fig. 25); 5) lines of pectinate setae on ventral surface of tibia III forming one main line ( Fig. 28).