Descrição da ninfa e redescrição dos adultos de Callibaetis radiatus Navás (Insecta: Ephemeroptera: Baetidae)

Abstract

The nymph of Callibaetis radiatus Navás (Insecta: Ephemeroptera: Baetidae) is described for the first time based on reared specimens. The following characteristics distinguish the species in the nymphal stage: labium slightly excavated medially; lingua of hypopharynx with three apical lobes; left prostheca robust, apically bifurcate, outer branch robust and with setae on inner margin inner branch slender; femur pale white, with dark gray punctuations anteriorly; tarsal claws with two rows of slender denticles; and arrangement of posterior spines on terga and paraprocts. Male and female adults are redescribed and are distinguished from other adults of Callibaetis by the following combination of characteristics: forewing costal and subcostal area strongly pigmented in females and without pigmentation in males; marginal intercalary veins of forewing mostly single; hindwing transparent, relatively narrow, with apex of costal process truncate and cross veins thicker than longitudinal veins; abdominal color pattern; and first segment of male genital forceps with acute internal process and third segment truncate. The species is reported for the first time from Brazil, thus expanding considerably its known range to the north.
 Keywords: Ephemeroptera, Baetidae, Callibaetis radiatus, Nymph, Adults, New record, Brasil.

The larvae of some species ofCallibaetisEaton (Ephemeroptera: Baetidae)

“…There are 14 valid species of Callibaetis known from adults in South America: C. camposi Nava´s (1930a), C. dominguezi Gillies (1990), C. fasciatus (Pictet 1843), C. gonzalezi (Nava´s 1934), C. gregarius Nava´s (1930b), C. guttatus Nava´s (1915a), C. jocosus Nava´s (1912), C. nigrivenosus Banks (1918), C. pollens Needham and Murphy (1924), C. radiatus Nava´s (1920b), C. sellacki (Weyenbergh 1883), C. viviparus Needham and Murphy (1924), C. willineri Nava´s (1932a), C. zonalis Nava´s (1915b). Only C. guttatus, C. radiatus and C. willineri are also known from larvae (Traver 1944;Da-Silva 1991;Salles et al 2003). The species only known from larvae are discussed here.…”

“…Although the species are very conspicuous, sometimes they are difficult to identify. In South America there are 14 valid species known from adults, with only three of them also known from larvae: C. guttatus, C. radiatus and C. willineri (Traver 1944;Da-Silva 1991;Salles, Da-Silva and Lugo-Ortiz 2003).…”

Efemeropterofauna (Insecta: Ephemeroptera) do trecho ritral inferior do Rio Campo Belo, Itatiaia, RJ: composição e mesodistribuição

“…Tal fato está, provavelmente, relacionado a uma identificação mais precisa dos táxons, diretamente ligada aos recentes avanços nos estudos de cunho taxonômico acerca da ordem Ephemeroptera no país e na América do Sul (e.g. Pereira & Da-Silva, 1990;Pescador & Peters, 1990;Peters & Pescador, 1991;Da-Silva, 1991, 1993, 1997Da-Silva & Pereira, 1992;Lugo-Ortiz & McCafferty, 1994, 1996a,b,c,d, 1997, 1999aDominguez et al, 1996;McCafferty, 2000;Da-Silva & Lopes, 2002;Lugo-Ortiz et al, 2002;Salles & Lugo-Ortiz 2002 a, b;Salles et al, 2003). Com tais avanços, a família Baetidae, por exemplo, sofreu expressivas modificações em sua taxonomia, com descrições de novos gêneros e espécies.…”