Tricorythopsis yusuaia, Belmont, Enide Luciana L., Cruz, Paulo Vilela & Hamada, Neusa, 2015

Belmont, Enide Luciana L., Cruz, Paulo Vilela & Hamada, Neusa, 2015, A new species of Tricorythopsis Traver, 1958 (Leptohyphidae) and occurrence of Pannota (Insecta: Ephemeroptera) species in Amapá state, Brazil, Zootaxa 4007 (1), pp. 104-112 : 108

Tricorythopsis yusuaia sp. nov.

( Figs. 7–11 )

Diagnosis: This species can be distinguished from other species in the genus by following combination of characteristics: 1) abdomen with black and reddish marks ( Figs. 7 and 8 ); 2) presence of strongly sclerotized spine on base of median filament ( Fig. 9 ); 3) base and lateral margins of penes sclerotized ( Fig. 11 ).

Description. Male imago: Length: body 1.5—1.8 mm; wing 1.8—2.1 mm (n = 10). General coloration, yellowish with black markings ( Fig. 12 ).

Head: Yellowish, with black markings on posterior margin ( Fig. 7 ). Ocelli grayish, surrounded by black. Scape, pedicel and flagellum yellowish.

Thorax: Pronotum whitish with black markings; two yellowish marks in posterolateral margin; Mesonotum yellowish with black and reddish marks on posterior region. Metanotum yellowish.

Wings: Membrane hyaline, longitudinal and cross veins grayish ( Fig. 10 ).

Legs: Coxae and trochanters of fore legs whitish; coxae of mid and hind legs with black marks and trochanters whitish. Femora whitish with reddish markings on distal portion; tibiae and tarsal segments of fore legs grayish; tibiae and tarsal segments of mid and hind legs whitish.

Abdomen: Terga translucent, with medial black mark on all segments, terga I to VII with reddish marks; sterna translucent, sterna I to VI with two black spots on anterolateral margins, sterna V to IX with medial black mark on all segments. Caudal filaments grayish, spine strongly sclerotized on base of median filament ( Fig. 9 ).

Genitalia: Yellowish; forceps two-segmented, with projected posterolateral margins of styliger plate forming slender base for each with distal segment conical, shorter than basal segment and directed outwardly; penes lobes slender, divided on apical 1/4; lateral margins of penes sclerotized ( Fig. 11 ).

Discussion: Tricorythopsis yusuaia sp. nov. is similar to Tricorythopsis artigas Traver, 1958 by presenting body with reddish and blackish marks; penes divided at apical 1/4 and posterolateral projections of styliger plate similar in length to forceps segment I. However, it can be separated by the strongly sclerotized spine on the base of the median filament and by the sclerotized lateral margins of the penis.

Etymology: The specific epithet is a free union of two words in Tupí-Guarani language, a Brazilian indigenous language (yu—thorn; suaia—tail); this word is a reference to the large spine present on the median filament.

Type material: Holotype—adult ♂ (alcohol), Brazil, Amapá, Amapá municipality, Amapá River Grande, Cachoeira Grande, (N 02°09'43.1" / W 050°55'17.3"), 07.viii.2011, Cruz, P.V. col. (INPA). Paratypes— 10 adults ♂ (alcohol), same data (INPA). Additional specimens: 1 male imago, Amapá, bridge over the Ranof River, Oiapoque road, (N 02°40'47.4" / W 51°21'09.1"), 10.viii.2013, Nascimento, J. M. C., Hamada, N., Silva, J. O. col. (INPA); 3 male imago, Amapá, Tartarugalzinho River, (N 01°45'55.7" / W 50°52'40.2"), 11.viii.2013, Nascimento, J. M. C., Hamada, N., Silva, J. O. col. (INPA); 4 male imago, Amapá, Amapá Grande River (waterfall), (N 02°09'43.7" / W 51°40'43.2"), 07.viii.2013, Nascimento, J. M. C., Hamada, N., Silva, J. O. col. (INPA).

Figures

FIGURES 7 — 11. Tricorythopsis yusuaia sp. nov., male adult. 7. dorsal view; 8. lateral view; 9. detail of spine on base of median filament (black arrow), lateral view; 10. forewing; 11. genitalia, ventral view.

FIGURES 12 — 16. Tricorythopsis yucupe, male adult. 12. dorsal view; 13. forewing; 14. genitalia, lateral view; 15 and 16. genitalia, ventral view.