Ulmeritoides angelus, Souto, Paula Malaquias, Da-Silva, Elidiomar Ribeiro, Nessimian, Jorge Luiz & Gonçalves, Inês Corrêa, 2016

Souto, Paula Malaquias, Da-Silva, Elidiomar Ribeiro, Nessimian, Jorge Luiz & Gonçalves, Inês Corrêa, 2016, Two new species of Ulmeritoides Traver (Ephemeroptera: Leptophlebiidae) from Southeastern Brazil, Zootaxa 4078 (1), pp. 127-136 : 130-132

Ulmeritoides angelus sp. nov.

( Figures. 1–2 , 5–9 , 15–18 , 20, 21 )

Material examined. HOLOTYPE: BRAZIL, Minas Gerais, Conceição do Mato Dentro, Serra do Intendente, Rio Peixe Tolo, 19°00’14.40”S, 43°36’45.00” W, 700 m a.s.l., 08–09.IX.2012, Salles, F.F., Rocha, I. & Braga, A. leg., 1 male imago ( DZRJ 2402). 13 PARATYPES: same data as holotype but, 1 male imago reared from subimago ( DZRJ 2403) and 4 female imagos ( DZRJ 2404); 4 female imagos ( DZRJ 2405); same data as holotype, 1 female imago ( CZNC Ep-6428); Jaboticatubas, Parque Nacional da Serra do Cipó, Córrego das Pedras, 19o22’16.7”S, 43o36’02.8”W, 766 m a.s.l., 0 2.III.2013, Oliveira, A.L.H. leg., 1 male imago reared from subimago ( DZRJ 2406); Santana do Riacho, Parque Nacional da Serra do Cipó, Córrego Bocaina, 19°20’45.50”S, 43°35’26.30”W, 796 m a.s.l., 0 3.III.2013, Oliveira, A.L.H. leg., 1 female subimago ( DZRJ 2407); same data, 1 male imago ( CZNC Ep- 6429).

Holotype Male Imago (in alcohol, wings on slide). Length of body 9.0 mm; forewings: 11.0 mm; hindwings 2.0 mm; General color light brown. Forewings with veins whitish except vein R1 light brown.

Head ( Figs 1–2 ): light brown, shaded with dark brown around base of antennae; anterior margin of head whitish with black tinge. Upper portion of eyes orange brown, lower portion black. Ocelli white surrounded with black. Scape and pedicel light brown, flagella whitish brown. Ventrally, head tinged with black with points of insertion of mouthparts whitish.

Thorax ( Figs 1–2 ): pronotum light brown shaded with black, lateral margins black. Meso and metanotum light brown; mesoscutellar impression yellowish. Sterna light brown tinged with dark brown; sutures dark brown. Pleura beige with strong purplish shade.

Wings ( Figs 5–7 ): membrane hyaline, base tinged with dark brown and purplish; veins whitish. Forewings with vein R1 light brown; membrane with distal half between C and R1 whitish; 10 cross veins basal to bullae; dark brown spots on bullae of veins Sc and R2.

Legs: leg I with coxae and trochanters light brown heavily shaded with dark brown, pleura between both segments beige with strong purplish shade; femora light brown with dark brown maculae, outer surface of femora more heavily shaded with dark brown than inner margin; tibiae light brown shaded with dark brown, particularly on apical half, apex whitish, presence of a median yellowish white maculae; tarsi whitish, tarsi III–V shaded with brown on basal 2/3; tarsal claws whitish tinged with brown. Legs II and III with coxae and trochanters yellowish brown heavily shaded with dark brown, pleura between both segments beige with purplish shade; femora, tibiae, tarsi and tarsal claws yellowish-brown; femora of both legs with dark brown maculae, two on outer and three on inner surface; leg II with dark brown subapical mark on tibiae.

Abdomen ( Figs 1–2 ): terga I–IX beige shaded with black, terga I–III more heavily shaded; tergum X yellowish brown; medial line well marked, dark brown on terga I–III, light brown on remaining terga. Sterna I–VIII beige heavily shaded with dark brown; sternum IX yellowish-brown. Caudal filaments with short simple setae, filaments whitish with alternate dark brown annulations.

Genitalia ( Figs 8–9 ): styliger plate and penes yellowish brown, forceps whitish. Base of forceps with crenulations on inner margin. Apex of penis lobes somewhat rounded, without ventral keel, each lobe with one central spine frontally directed.

Variations in paratypes. One male with 11 crossveins basal to bullae on forewings, other with 8 crossveins on one of the wings. Several color variations: fore femora sometimes lighter in color, maculae on fore femora sometimes not very distinguishable on outer surface, femora of legs II and III sometimes without all of the described maculae.

Male subimago. All specimens collected in this stage molted to imago, subimagos were, however, observed and photographed in the field ( Fig. 15 ). Wings dark grey.

Female Imago. Length of body 8.5 – 9.0 mm; forewings: 11.0 – 11.6 mm; hindwings 2.4 mm; General color light brown and beige. Forewings with veins whitish.

Head: similar to male imago.

Thorax: similar to male imago.

Wings: hyaline, base tinged with dark brown and purplish. Forewings with longitudinal veins light brown, crossveins whitish; membrane with distal half between C and R1 whitish; dark brown spots on bullae of veins Sc and R2; 8–10 crossveins basal to bullae. Hindwings with veins whitish.

Legs: legs similar to male imago. Leg I with same color pattern only darker and shorter.

Abdomen: when without eggs, same color pattern as male imago except somewhat translucent; when bearing eggs, color pattern altered due to egg color, yellowish. Sternum IX broadly cleft apically. Caudal filaments lost.

Egg ( Figs. 20, 21 ): yellow. Egg mass spherical, eggs elliptical in shape. Attachment structures as sucker-like discs or plates and fiber-coil; chorion punctate and with tubercles.

Female subimago. similar to imago, except the wings, which have dark grey membrane, even darker in the living specimen.

Nymph. Unknown.

Biology. Unknown.

Etymology. angelus specific name after the entomologist colleague Angelo B. M. Machado on the occasion of his 80th birthday. Name in apposition, nominative singular from classical form.

Remarks. Ulmeritoides angelus sp. nov. can be separated from other species of the genus according to the following combination of characters: (1) forewings hyaline, base dark brown and purplish; (2) veins R1 light brown; (3) dark brown spots on bullae of veins Sc and R2 ( Fig. 5 ); (4) abdominal color pattern as on Figures 1–2 ; (5) apex of penis lobes somewhat rounded, each with one central spine ( Figs 8–9 ).

The new specie resembles U. flavopedes especially because of the abdomen color pattern and black markings on the bullae. However, U. angelus sp. nov. can be separated from it by the presence of dark brown spots on bullae of veins Sc and R2 and the penis morphology. Ulmeritoides flavopedes possess spots on bullae of vein Sc and the apex of penis lobes rounded, each with a lateral groove, whereas the new species possess the apex of penis lobes somewhat rounded, each with one central spine.

Figures

FIGURES 1 – 4. Male imagos of Ulmeritoides species. 1 – 2. U. angelus sp. nov. in dorsal (1) and lateral (2) views; 3 – 4. U. tamoio sp. nov. in dorsal (3) and lateral (4) views.

FIGURES 5 – 9. Ulmeritoides angelus sp. nov., male imago. 5. fore wing; 6. hind wing; 7. hind wing (enlarged); 8. genitalia (ventral view); 9. penis lobe (ventral view).

FIGURES 15 – 18. Ulmeritoides angelus sp. nov., imago and subimago. 15. male subimago; 16. male imago; 17. female subimago; 18. female imago. Photos by Frederico F. Salles.

FIGURES 19 – 21. SEM photographs of eggs of Ulmeritoides species. 19. U. angelus sp. nov., general aspect; 20 – 21. U. angelus sp. nov., attachments structures (20) and chorionic sculpturing showing punctation and tubercules (21).