Americabaetis alphus Lugo-Ortiz & McCafferty, 1996: 163 Francischetti et al ., 2003: 69 Salles et al ., 2004: 2 Domínguez et al ., 2006: 69 Salles et al ., 2010: 302 The genus Americabaetis Kluge (Ephemeroptera: Baetidae) in Brazil: new species, stage description, and key to nymphs Salles, F. F. Raimundi, E. A. Boldrini, R. Souza-Franco, G. M. Zootaxa 2010 2010-08-06 2560 1 16 28  Salles et al ., 2010: 302  CR5H Lugo-Ortiz & McCafferty, 1996 Lugo-Ortiz & McCafferty 1996 [151,818,674,700] Insecta Baetidae Americabaetis Animalia Ephemeroptera 6 22 Arthropoda species alphus  ( Figs. 1b, 20, 23, 24, 28)      Americabaetis alphus Lugo-Ortiz & McCafferty, 1996: 163;  Francischetti et al., 2003: 69;  Salles et al., 2004: 2;  Domínguez et al., 2006: 69;  Salles et al., 2010: 302.  Diagnoses.Nymphs: 1) frontal keel present; 2) lingua pointed apically; 3) glossa 0.8x length of paraglossa; 4) apex of paraglossa with rows of simple setae; 5) segment II of labial palp with a strong distomedial projection; 6) posterior margin of abdominal terga with pointed spines.  Male imago: 1) turbinate eyes uniformly and widely separated from each other, upper surface ellipsoidal; 2) forceps with first segment not constricted medioapically; 3) posterior margin of subgenital plate without a small rounded projection; 4) length of body relatively small (less than 5.0 mm).   Distribution. ARGENTINA, BOLIVIA, CHILE, PARAGUAY, BRAZIL: Rio Grande do Sul, Santa Catarina, Paraná, Minas Gerais, São Paulo, Rio de Janeiro, Espírito Santo, Mato Grosso, Bahia. NEW RECORDS: Pernambuco, Sergipe, Goiás, Amazonas( Fig. 1a).   Comments.  Americabaetis alphusis probably the species of Ephemeropterawith the widest distributional range in South America, as well as one of the most abundant, at least in Brazil. Their nymphs are found in several biomes and on small streams to large rivers, often associated with marginal vegetation and leaf litter in areas with slow to moderate current ( Fig. 28). The altitudinal range of this species is also highly variable, specimens were found from the sea level to 1900 m.a.s.l. They were also encountered in pristine to moderately impacted streams, demonstrating that the species is somewhat tolerant, what, in turn, would explain its wide distribution.   Material examined.  ALAGOAS, Rio Largo, Afluente do Rio Mandaú, "Lajeiro", S 09°28.496'/ W 35°52.303', Vegetaçãomarginal,  15/iii/2004, CNFCOL. ( UFVB);  SERGIPE, Japaratuba, Rio da Prata, S 10°37.764'/ W 36° 55.451', Vegetaçãomarginal,  18/iii/2004, muitos, CNFCOL. ( UFVB);  GOIÁS, Corumbáde  Goiás. Corredeira da Igreja Presbiteriana, acima da calheira, S 15°49’37.1’’/ W 48°46’34.8’’,  26/vi/2003, NH COL. ( INPA);  BAHIA, Correntina. Rio do Mucambo, S 13°16’45.4’’/ W 44°33’52.0’’, pedras roladas em correnteza,  03/viii/2003, NH & FFS COL. ( DZRJ);  AMAZONAS, Presidente Figueiredo, Ig.  Santa Cruz, hidrófitas submersas em correnteza, 08/x/03, FFS ( CEUNES);  AMAZONAS, Presidente Figueiredo, Ig. do Km20, vegetação marginal em correnteza fraca, 07/x/03, F.F.Salles( CEUNES);  ESPÍRITO SANTO, Santa Teresa, Nova Lombardia, Sítio Capitel de Santo Antônio, S 19°52’16.0”/ W 40°31’43.3”,   718 m.a.s.l.,  19/i/ 2008, FFS col. ( CEUNES);  ESPÍRITO SANTO, Santa Teresa, Nova Lombardia, Sítio Capitel de Santo Antônio, Córrego Grande, S 19°52’31.0”/ W 40°31’49.1”,   768 m.a.s.l.,  20/i/2008, vegetação marginal, FFS col. ( CEUNES);  ESPÍRITO SANTO, Caparaó, córrego na estrada, S 20°24’05,5’’/ W 41°453.45,9’’,  1015 m.a.s.l.,  21/iv/2008, vegetação marginal, FFS col. ( CEUNES). 2004-03-15 CNF, UFVB Vegetacao -9.474934 Afluente do Rio Mandau 1 -35.871716 Rio Largo 6 22 1 Alagoas 2004-03-18 CNF, UFVB Vegetacao -10.6294 Rio da Prata 1 -36.924183 Japaratuba 6 22 1 Sergipe Corumba GOIAS 6 22 1 Goias 2003-06-26 INPA -15.826972 Corredeira da Igreja Presbiteriana 1 -48.776333 6 22 1 Goias 2003-08-03 DZRJ -13.279278 Correntina. Rio do Mucambo 1 -44.564445 6 22 1 Bahia [785,1280,1669,1695] Presidente Figueiredo & Ig AMAZONAS 6 22 1 Amazonas CEUNES Santa Cruz 6 22 1 Santa Cruz CEUNES F. F. Salles Ig. do Km Presidente Figueiredo 6 22 1 Amazonas 2008-01-19 CEUNES Santa Teresa 718 -19.87111 Sitio Capitel de Santo Antonio 1 -40.528694 Nova Lombardia 6 22 718 Espirito Santo 2008-01-20 CEUNES Corrego Grande Santa Teresa 768 -19.875278 Sitio Capitel de Santo Antonio 1 -40.530304 Nova Lombardia 6 22 768 Espirito Santo 2008-04-21 CEUNES 1015 -20.401527 Caparao 0 -41.0 6 22 1 Espirito Santo