Ulmeritoides aurantifrons, Neto, Jaime De Liege Gama & Passos, Mahedy Araujo Bastos, 2016

Neto, Jaime De Liege Gama & Passos, Mahedy Araujo Bastos, 2016, Leptophlebiidae (Ephemeroptera) from Roraima State, Brazil: description of two new species of Ulmeritoides Domínguez, 1991, Zootaxa 4178 (2), pp. 295-300 : 296

Ulmeritoides aurantifrons sp. nov.

( Figs. 1–2 ; 5–9)

Diagnosis. Ulmeritoides aurantifrons sp. nov. can be separated from all congeners by the following combination of characters: 1) forewing and hind wing with membrane hyaline, dark brown at base ( Fig. 5–7 ); costal and subcostal areas opaque, bulla of Sc surrounded with black ( Fig. 5 ); 2) mesoscutal suture with a yellow spot in the apical and medial region ( Fig. 2 ); 3) area between apex of medioscutum and posterior scutal protuberances with a yellowish spot ( Fig. 2 ); 4) scutellum dark brown with base and apex yellow ( Fig. 1–2 ); 5) penis white translucent; penis lobes with a ventral groove and apically rounded ( Fig. 9 ).

Maximum length: body 6.2–7.1mm (n=10); forewings: 6.4–7.6mm (n=10); hind wings 0.9–1.0mm (n=10).

Head ( Figs. 1–2 ): brown; front orange. Upper portion of compound eyes light orange-brown; lower portion blackish. Ocelli white surrounded with black. Antennae brown.

Thorax ( Figs. 1–2 ): pro-, meso- and metanotum light brown. Mesoscutal suture with a yellow spot in both apical and medial region and a yellowish spot between the apex of the medioscutum and the posterior scutal protuberance; scutellum dark brown with base and apex yellow; base of posterior scutal protuberance yellow in lateral view. Pleura and sterna brown.

Wings ( Figs. 5–7 ): membrane hyaline, base tinged with dark brown; veins whitish. Distal half of costal area opaque; longitudinal and cross veins hyaline, except basal half of veins C and Sc, darker; blackish spot on bullae of vein Sc; 2 cross veins basal to bulla. Hind wings with longitudinal and cross veins translucents, except basal half of veins C and Sc, darker.

Legs: leg I brown, except apex of tibia whitish; tarsal segment I white tinged with brown; tarsal segments II and III brown with apex white; tarsal segment IV white, dorsally tinged with brown. Legs II and III white, femora with brown spot in basal and middle region, tibiae with a small light brown spot at apex; tarsi white, slightly tinged with brown.

Abdomen: ( Figs. 1–2 ): Terga I–V brown with posterior margins blackish; terga VI–IX orange-brown. Sterna translucent brown.

Genitalia ( Figs. 8–9 ): styliger plate brown; penes and forceps translucent white. Segment I of forceps tinged with black on outer margin. Apex of penis lobes rounded, each lobe with a longitudinal ventral groove. Caudal filaments white, each segment with a black ring at base.

Female imago and nymph. Unknown.

Material. HOLOTYPE: 1 male imago, BRAZIL, Roraima State, Mucajaí municipality, stream in Tamandaré vicinity (2°28’50.53’’"N/ 60°55'29.52"W), 30.x. 2015 to 3.xi.2015, Cruz, J.A., coll. (INPA—EPH 000014) . PARATYPES: 9 male imagos, same data as holotype (5 INPA—EPH 0 0 0 0 15 and 4 CZNC—EP 7006).

Etymology. The epithet " aurantifrons " is a reference to the orange coloration of the front of this species (auranti = orange colored + frons= front).

Remarks. This species keys out as U. passorum in the key proposed by Salles & Domínguez (2012) and modified by Souto et al. (2016). However, the new species can be easily distinguished by the coloration of mesonotum and bulla and penis morphology. Ulmeritoides passorum possess a yellowish transversal line at the apex of the posterior scutal protuberance, bulla unpigmented and penis lobes cylindrical and without ventral grove, whereas in U. aurantifrons sp. nov. the yellowish transversal line is absent, bulla is surrounded with black, and penis lobes have a ventral groove.

Figures

FIGURES 1 – 4. Male imagos of Ulmeritoides species: 1 – 2. Ulmeritoides aurantifrons sp. nov. in lateral (1) and dorsal (2) views; 3 – 4. Ulmeritoides mirr sp. nov. in lateral (3) and dorsal (4) views.

FIGURES 5 – 9. Ulmeritoides aurantifrons sp. nov., (5) Forewing; (6) Hind wing; (7) Hind wing enlarged; (8). Genitalia (ventral view); (9) Lobes of penis enlarged (ventral view).