-(Eunotiaceae (Eunotiales, Bacillariophyta) in lacustrine environments in the Coastal Plain from South of Brazil). The Eunotiaceae study in several environments (lakes, swamps and dams) in the Costal Plain of Rio Grande do Sul State was carried out in the autumn and the spring of 2003. Twenty six specific and infra-specific taxa were identified, one belonging to Actinella and twenty five to Eunotia. The highest richness of Eunotia species was reported in the swamps where we found a lush marginal vegetation and more acid water (pH 4,3 and 5,4). Eunotia bilunaris (Ehr.) Souza, E. tridentula Ehr. var. tridentula, E. vumbae Choln., E. yberai Freng. and E. zygodon Ehr. are new records for the Coastal Plain of Southern Brazil. The species are described, commented, and illustrated in light microscope (LM) and/or in scanning electron microscope (SEM).
O trabalho tem como objetivo apresentar as características morfológicas, e/ou estruturais e métricas de 12 espécies de Eunotia (E. batavica A. Berg, E. deficiens Metz., Lange-Bert & García-Rodr., E. genuflexa Nörpel-Sch., E. hepaticola Lang-Bert. & Wydrz., E. herzogii Krasske, E. mucophila (Lange-Bert., Nörpel-Sch. & Alles) Lange-Bert., E. pileus Ehr., E. pirla Carter & Flower, E. schwabei Krasske, E. subarcuatoides Alles, Nörpel-Sch. & Lange-Bert., E. transfuga Metz. & Lange-Bert. e E. yanomami Metz. & Lange-Bert.) encontradas nas áreas da Lagoa do Casamento e dos Butiazais de Tapes, entre as coordenadas 30º10'-30º40'S e 50º30'-51º30'W, na Planície Costeira do Rio Grande do Sul. São incluídos comentários sobre a distribuição e os ambientes onde os táxons foram encontrados.
-(Diatoms on Limnoperna fortunei (Dunker), an introduced mollusk in Guaíba Lake, southern Brazil). The taxonomic composition of diatoms present on the mollusk Limnoperna fortunei (golden mussel), introduced into Guaíba Lake through ballast water, from ships coming from Argentina, was analyzed with the intention of identifying and evaluating the occurrence of the species in relation to habitat and origin. Mollusks were obtained from a floating wooden platform and on floats situated in the northern region of Guaíba Lake, during the period of August to November 2005. The diatoms were scraped from the shells, analysed under microscope and were oxidized for identification. Results have shown that the molluskan shell may be a favorable habitat for diatom, considering the species richness. Diatom association did not demonstrate to be restricted this habitat, since the most frequent species: Cocconeis fluviatilis Wall., C. placentula Ehr. var. lineata (Ehr.) Heurck, Encyonema silesiacum (Bleisch) Mann, Eunotia pseudosudetica Metz., Lange-Bert. & Garcia-Rodr., Gomphonema parvulum (Kütz.) Kütz., Hydrosera whampoensis (Schw.) Deby, Luticola goeppertiana (Bleisch) Mann, Melosira varians Ag., Navicula symmetrica Patr., Nitzschia palea (Kütz.) Smith, Pinnularia acrosphaeria Smith, Planothidium frequentissimum (Lange-Bert.) Round & Bukh., Pleurosira laevis (Her.) Comp. and Ulnaria ulna (Nitzsch) Comp. were found on rocky substrata and in the plankton of the Guaíba Lake hydrographic basin. Therefore, Eunotia pseudosudetica, Luticola dapalis (Freng.) Mann and Gomphonema mexicanum Grun. are taxa only reported, until now, for the Rio de la Plata, Argentina and their occurrences in Guaíba Lake support the hypothesis of a recent introduction of these species through ballast water as L. fortunei. Key-words -diatoms epizoic, introduced species, taxonomyRESUMO -(Diatomáceas sobre Limnoperna fortunei (Dunker), molusco introduzido no Lago Guaíba, Sul do Brasil). A composição taxonômica de diatomáceas presentes sobre o molusco Limnoperna fortunei (mexilhão dourado), introduzido no Lago Guaíba através da água de lastro de navios oriundos da Argentina, foi analisada com o objetivo de identificar e avaliar a ocorrência das espécies quanto ao habitat e origem. Os moluscos foram retirados de plataforma flutuante de madeira e de bóias situadas na região norte do Lago Guaíba, no período de agosto a novembro de 2005. As diatomáceas presentes sobre as conchas dos moluscos foram raspadas, analisadas sob microscópio e posteriormente oxidadas para identificação. Os resultados demonstraram que a concha do molusco pode ser considerada um habitat favorável às diatomáceas, tendo em vista a riqueza de espécies. A associação de diatomáceas não demonstrou estar restrita a este habitat, pois as espécies mais frequentes Cocconeis fluviatilis Wall., C. placentula Ehr. var. lineata (Ehr.) Heurck, Encyonema silesiacum (Bleisch) Mann, Eunotia pseudosudetica Metz., Lange-Bert. & Garcia-Rodr., Gomphonema parvulum (Kütz.) Kütz., Hydrosera whampoensis (Schw....
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