Abstract
The genus comprises 13 species, but only nymphs of six species have been described. In the present paper the nymph of Ulmeritoides uruguayensis is figured and described. The nymph of U. uruguayensis can be distinguished from its congeners by the following differential characters: 1) middle tibia with an apical black spot; 2) glossa with digitate bristles on apex; 3) segment I and base of segment II of maxillary palpi brown; 4) posterolateral projections on abdominal segments II–IX.
References
Ávila A., S. & Flowers, W.R. (2005) New species and records of Ulmeritoides (Ephemeroptera: Leptophlebiidae) from Costa Rica. Zootaxa, 1010, 1–14.
Domínguez, E. (1991) The status of the genus Ulmeritoides (Ephemeroptera Leptophlebiidae: Atalophlebiinae) and related taxa. In: Alba-Tercedor, J. & Sanchez-Ortega, A. (Eds.), Overview and Strategies of Ephemeroptera and Plecoptera. Sandhill, Gainesville, pp. 157–167.
Domínguez, E. (1995) Cladistic analysis of the Ulmeritoides group (Ephemeroptera: Leptophlebiidae), with descriptions of five new species of Ulmeritoides. Journal of the New York Entomological Society, 103, 15–38.
Domínguez, E., Molineri, C., Pescador, M.L., Hubbard, M.D. & Nieto, C. (2006) Aquatic Biodiversity of Latin America, Vol. 2: Ephemeroptera of South America. Pensoft Publisher, Bulgaria, 646 pp.
Lopes, M.J.N., Da-Silva, E.R. & Py-Daniel, V. (2003) A new species of Ulmeritoides from Brazil (Ephemeroptera: Leptophlebiidae). Revista de Biología Tropical, 51, 195–200.
Thew, T.B. (1960) Taxonomic studies on some Neotropical Leptophlebiid mayflies (Ephemeroptera: Leptophlebiidae). Pan-Pacific Entomology, 36, 119–132.
Traver, J.R. (1956) A new genus of Neotropical mayflies (Ephemeroptera: Leptophlebiidae). Proceedings of the Entomological Society of Washington, 58, 1–13.
Traver, J.R. (1959) Uruguayan mayflies. Family Leptophlebiidae: Part I. Revista de la Sociedad Uruguaya de Entomología, 3, 1–13.