Ulmeritoides amajari, Boldrini & Lima, 2017

Boldrini, R. & Lima, L. R. C., 2017, New species and stages description of Ulmeritoides Traver, 1959 (Ephemeroptera: Leptophlebiidae) from Roraima State, Northern Brazil, Zootaxa 4282 (2), pp. 385-394 : 386-390

Ulmeritoides amajari sp. nov.

( Figs. 1–13 )

Diagnoses. Ulmeritoides amajari sp. nov. can be separated from the other species of the genus by the following combination of characters. In the imago: 1) forewings hyaline, base brown and without dark spots in bullae in Sc and R1 ( Fig. 4 ); 2) one cross-veins basal to bulla in forewings ( Fig. 4 ); 3) abdominal color pattern as in Fig. 1 ; 4) penis lobe ending in an rounded apical projection ( Fig. 7 ). In the female: forewings hyaline, base brown and without dark spots in bullae in Sc and R1; 2) one cross-veins basal to bulla in forewings; 3) abdominal color pattern as in Fig. 2 . In the nymph: 1) medial denticle on anteromedian emargination of labrum much larger than others ( Figs. 8, 8 a); 2) tusk on inner margin of maxillae well developed ( Figs. 10, 10 a); 3) dorsum of fore femur with numerous, acute spines ( Fig. 11 ); 4) lines of pectinate setae on ventral surface of tibia III forming one main line ( Fig. 13 ).

Male Imago. Length: body: 5.5–6.2 mm; forewings: 5.7–6.5 mm; hind wings: 1.0– 1.1 mm.

General coloration brown ( Fig. 1 ).

Head: flagellum light brown; ocelli white, reddish brown basally; upper portion of eyes reddish, lower portion blackish.

Thorax: pro-, meso- and metanotum brown; pro-, meso-, and metasternum reddish brown. Wings ( Figs. 4, 5, 5 a): membrane of forewings ( Fig. 4 ) hyaline, wing base light brown; main longitudinal and intercalaries veins light brown, cross-veins hyaline; one cross-vein basal to bulla. Membrane of hind wings ( Figs. 5, 5 a) hyaline; longitudinal and cross-veins hyaline.

Legs ( Fig. 1 ): Yellowish; middle region of all femora with short blackish mark. Leg I: femur washed with reddish brown; tibia washed with light brown, subapical portion of tibia with a black band; tarsi II and III washed with light brown. Tibia II and III with a reddish brown band apically.

Abdomen ( Fig. 1 ): Terga reddish brown. Terga I, II and III darker. Terga I–VIII with lateral light reddish brown spots. Sterna light reddish brown.

Genitalia ( Fig. 6 ): penis yellowish, washed with reddish brown basally, apex yellowish. Forceps yellowish, segment I and II washed with light brown. Apex of penis lobe ending in a inner rounded apical projection ( Fig. 7 ), and with a lateral pointed projection (7a). [Caudal filaments broken off and lost].

Female imago. Length: body: 5.7–6.3 mm; forewings: 5.1–7.1 mm; hind wings: 1.1 mm.

General color light brown ( Fig. 2 ).

Head: pedicel brown; ocelli white, blackish basally; area between lateral ocelli and eyes brown.

Thorax: Lateral margins of pronotum and pleura blackish. Wings. Wings membrane hyaline. Similar to male imago.

Legs ( Fig. 2 ): light brown; middle region of all femora with short blackish marks; Leg I: femur washed with brown; tibia washed with light brown, subapical portion of tibia with a black band. Subbasal region of hind femur with a longitudinal blackish stripe. Tarsi II and III washed with black.

Abdomen ( Fig. 2 ): Terga I, II and III darker; terga I–VIII with lateral light brown spots, and terga IV–VIII with a medial light brown spots. Sterna I–III darker. [Caudal filaments broken off and lost].

Nymph. Length: body: 6.3–7.1 mm. Nymphal exuviae: Tibia I: 1.2 mm; Tibia II: 1.1 mm; Tibia III: 1.3 mm.

General coloration: light brown to brown.

Labrum ( Figs. 8, 8 a): Subrectangular, broader than long; with one middle larger and apically rounded denticle and four inconspicuous denticles.

Mandibles: Apical 1/2 of right mandible with inner and outer margin with fine long setae; inner and outer incisors with two and three denticles respectively. Apical 1/2 of left mandible ( Fig. 9 ) with outer margin with fine long setae; inner and outer incisors with three denticles.

Maxilla ( Figs. 10, 10 a): Small tusk on inner apical margin present; one robust and twelve subapical pectinate setae.

Labium: Segment I with fine, simple setae scattered on inner margin; outer margin with a row of setae increasing in length toward apex, long pectinate setae near apex. Segment II with fine, simple setae scattered on inner and outer margin; dorsally with a diagonal row of seven simple setae. Segment III with fine, simple setae scattered on inner and outer margin.

Thorax ( Fig. 3 ): nota light brown.

Leg I ( Fig. 11 ): Brown; subapical region of tibia dark brown. Femur outer margin with long, pectinate setae; dorsal surface with long, pectinate setae near outer margin, inner margin with spine-like pectinate setae and with spine-like setae on midline. Tibia inner margin with a row of long, pectinate setae; dorsal and ventral surface with fine, long, simple setae near outer margin, and with spine-like setae near inner margin. Tarsi inner margin with a row of spine-like setae, and outer margin with fine, long simple setae. Claws with six denticles increasing in length toward apex.

Leg II ( Fig. 12 ): Femur similar to leg I.

Leg III ( Fig. 13 ): Subapical region of tibia and tarsi dark brown. Femur outer margin with simple setae; inner margin with a row of spine-like setae. Tibia ventral surface with a row of long, pectinate setae; dorsal surface with a row of spine-like setae near inner margin; apex with five long, pectinate setae.

Abdomen ( Fig 3 ): terga brown. Posterolateral projections lighter, present on abdominal segments II-IX. Sterna light brown. Gills gray. [Caudal filaments broken off and lost].

Distribution. Brazil: Roraima: Amajari municipality.

Material examined. Holotype. Male imago (reared), Brazil, Roraima, Amajari , Rio Amajari , below the bridge, 3°39’51.6’’N / 61°21’32.46’’W, 30.iii.2016, Boldrini, R. coll ( INPA) . Paratypes: Three female imago, Brazil, Roraima, Amajari , Rio Amajari , below the bridge, 3°39’51.6’’N / 61°21’32.46’’W, 16.ii.2016, Boldrini, R., Lima, L.R.C. coll ( UFRR) . Two female and one male imagos (all reared), Brazil, Roraima, Amajari , Rio Amajari , below the bridge, 3°39’51.6’’N / 61°21’32.46’’W, 16.ii.2016, Boldrini, R., Lima, L.R.C. colls ( CZNC) . Two female and three male imagos, Brazil, Roraima, Amajari , Rio Amajari , below the bridge, 3°39’51.6’’N / 61°21’32.46’’W, 30.iii.2016, Boldrini, R. coll ( UFRR) . Three imature nymphs, Brazil, Roraima, Amajari , Rio Amajari , below the bridge, 3°39’51.6’’N / 61°21’32.46’’W, 30.iii.2016, Boldrini, R. coll ( UFRR) .

Etymology. Amajari , name of the river where the material was collected.

Comments. The male imago of Ulmeritoides amajari sp. nov. have a forewing coloration and penis shape similar to that of the widespread species U. uruguayensis . Ulmeritoides amajari sp. nov. is distinguished from U. uruguayensis by apex of penis lobe; U. amajari sp. nov. has the apex of penis lobe ending in a inner rounded apical projection, while U. uruguayensis has the apex of penis lobe ending in a inner pointed apical projection. The nymphs of both species can be distinguished by lines of pectinate setae on ventral surface of tibia III ( U. amajari has one main line, while U. uruguayensis , has two lines).

Figures

FIGURES 1 – 3. Ulmeritoides amajari sp. nov. 1, male imago (lateral view); 2, female imago (dorsolateral view); 3, nymph (dorsal view).

FIGURES 4 – 7. Ulmeritoides amajari sp. nov., male imago. 4, forewing; 5, hind wing; 5 a, hind wing (enlarged); 6, genitalia; 7, detail of penis (dorsal view); 7 a, detail of penis (ventro-lateral view).

FIGURES 8 – 13. Ulmeritoides amajari sp. nov., nymph. 8, labrum; 8 a, detail of anterior margin of labrum; 9, left mandible; 10, maxilla; 10 a, detail of maxillary tusk; 11, foreleg; 12, mid leg; 13, hind leg.