Abstract
Eight species of Caenis are reported from Argentina, and new records are given for Bolivia, Brazil and Uruguay. The nymphs of five of them are firstly described from reared material: Caenis burmeisteri, C. dominguezi, C. gonseri, C. tenella new combination, and C. ludicra. Female adult stage of all these species (except C. tenella) are also firstly described. The new combination Caenis tenella is proposed, and the name Caenis grimi is here treated as a junior synonym of it. Caenis uruzu new species is described from male imagos and nymphs. New distributional records from Argentina and Uruguay are given. Diagnosis and illustrations to distinguish all the treated species from other Caenis species are proposed. A key to adults and nymphs from Argentinean species of Caenis is provided.References
Alba-Tercedor, J. & W.L. Peters (1985) Types and additional specimens of Ephemeroptera studied by Longinos Navas in the Museo de Zoología del Ayuntamiento, Barcelona, Spain. Aquatic Insects, 7, 215–227.
Alba-Tercedor, J. & S. Mosquera (1999) Caenis chamie: a new species from Colombia (Ephemeroptera: Caenidae). Pan-Pacific Entomologist, 75, 61–67.
Domínguez, E. (1989) Tipos de Ephemeroptera de L. Navas depositados en las colecciones entomológicas de la Argentina. Revista de la Sociedad Entomológica Argentina, 45, 271–274.
Domínguez, E., Molineri, C., Pescador, M., Hubbard, M. D. & Nieto, C. (2006) Aquatic Biodiversity in Latin America, Vol. 1: Ephemeroptera of South America. Pensoft, Sofia-Moscow, 646 p.
Froehlich, C.G. (1969) Caenis cuniana sp. n., a parthenogenetic mayfly. Beiträge zur Neotropischen Fauna, 6, 103–108.
Hubbard, M.D. (1982) Catálogo abbreviado de Ephemeroptera da América do Sul. Papéis Avulsos de Zoologia, 34, 257–282.
Kluge, N. Ju. (2004) The Phylogenetic System of Ephemeroptera. Kluwer Academic Publishers, Boston, 442 pp.
Lestage, J.A. (1931) Contribution à l'étude des Ephéméroptères. VIII. Les Ephéméroptères du Chili. Bulletin et Annales de la Société Entomologique de Belgique, 71, 41–60.
Malzacher, P. (1986) Caenidae aus dem Amazonasgebiet (Insecta, Ephemeroptera). Spixiana, 9, 83–103.
Malzacher, P. (1990) Neue Arten der Eintagsfliegen-Familie Caenidae (Insecta, Ephemeroptera) aus Südamerika. Studies on Neotropical Fauna and Environment, 25, 31–39.
Malzacher, P. (1991) Genital-morphological features in the Caenidae. In: Alba–Tercedor, J. A. & Sánchez–Ortega, A. (eds.), Overview and Strategies of Ephemeroptera and Plecoptera. Sandhill Crane Press, Gainsville, Florida, pp. 73–85.
Malzacher, P. (1998) Remarks on the genus Brasilocaenis (Ephemeroptera: Caenidae), with the description of a new species: Brasilocaenis mendesi. Stuttgarter Beiträge zur Naturkunde Ser. A, 580, 1–6.
Malzacher, P. (2001) South and Central American Caenis species with rounded forceps tips (Insecta: Ephemeroptera: Caenidae). Stuttgarter Beiträge zur Naturkunde Ser. A, 626, 1–20.
Navas, L. (1915) Neurópteros sudamericanos. Segunda Serie. Broteria (Serie Zoologica), 13, 5–13.
Navas, L. (1920) Insectos Sudamericanos. Tercera serie. Anales de la Sociedad Científica Argentina, 90, 52–72.
Navas, L. (1922) Estudis sobre Nevròpters (Insectes). Arxivs d'Institvt de Ciencies (Barcelona), 7, 179–203.
Navas, L. (1924) Insectos de al Argentina y Chile. Estudios, 1922, 358–368.
Navas, L. (1930a) Insectos de la Argentina. Sexta Serie. Revista de la Sociedad Entomológica Argentina, 3, 125–132.
Navas, L. (1930b) Algunos insectos de Chile. Cuarta serie. Revista Chilena de Historia Natural, 34, 350–366.
Navas, L. (1931) Insectos de la Argentina. Séptima serie. Revista de la Sociedad Entomológica Argentina, 3, 317–324.
Navas, L. (1932) Insectos de la Argentina. Revista de la Academia de Ciencias de Zaragoza, 16, 87–120.
Pereira, S.M. & E.R. Da-Silva (1990) Nova espécie de Caenis Stephens, 1835 do sudeste do Brasil (Ephemeroptera, Caenidae). Boletim do Museu Nacional, Nova Série (Rio de Janeiro), Zoologia, 341, 1–8.
Puthz, V. (1975) Eine neue Caenidengattung aus dem Amazonasgebiet (Insecta: Ephemeroptera: Caenidae). Amazoniana, 5, 411–415.
Soldán, T. (1986) A revision of the Caenidae with ocellar tubercles in the nymphal stage (Ephemeroptera). Acta Universitatis Carolinae, Biologica (1982–1984), 289–362.
Thew, T.B. (1960) Revision of the genera of the family Caenidae (Ephemeroptera). Transactions of the American Entomological Society, 86, 187–205.