Abstract
Ulmeritoides acosa new species (type locality: La Palma, Costa Rica) and Ulmeritoides chavarriae new species (type locality: Santa Elena, Parque Nacional Santa Rosa, Costa Rica) (Ephemeroptera: Leptophlebiidae) are described from imagos and nymphs. Both species occur along the west coast of Costa Rica, and both are adapted to living in temporary streams. Additional localities are given for Ulmeritoides guanacaste Domínguez and Ulmeritoides tifferae Domínguez, and a key is given for adults and nymphs of the four Costa Rican species of Ulmeritoides.References
Bewket, W. & Sterk, G. 2005. Dynamics in land cover and its effect on stream flow in the Chemoga watershed, Blue Nile basin, Ethiopia. Hydrological Processes, 19, 445–458.
Domínguez, E. (1991) The status of the genus Ulmeritus (Ephemeroptera: Leptophlebiidae: Atalophlebiinae) and related taxa. In: Alba-Tercedor, J. & Sanchez-Ortega, A. (Eds.), Overview and Strategies of Ephemeroptera and Plecoptera. Sandhill Crane Press, Gainesville, Florida, pp. 157–178.
Domínguez, E. (1995) Cladistic analysis of the Ulmeritus–Ulmeritoides group (Ephemeroptera, Leptophlebiidae), with descriptions of five new species of Ulmeritoides. Journal of the New York Entomological Society, 103, 15–38.
Domínguez, E. & Zuñiga, M.C. (2003) First generic record and description of a new species of Ulmeritoides (Ephemeroptera: Leptophlebiidae) from Colombia. In: Gaino, E. (Ed), Research update on Ephemeroptera & Plecoptera. Università di Perugia. Perugia, Italy, pp. 123–125
Edmunds, G.F., Jr., Jensen, S.L. & Berner, L. (1976) The Mayflies of North and Central America. University of Minnesota Press, Minneapolis, 330+xi pp.
Traver, J.R. (1959) Uruguayan mayflies. Family Leptophlebiidae: Part I. Revista de la Sociedad Uruguyensis de Entomología, 3, 1–13.
Viramontes, D. & Descroix, L. (2003) Changes in the surface water hydrologic characteristics of an endoreic basin of northern Mexico from 1970 to 1998. Hydrological Processes, 17, 1291–1306.