LEHMKUHL, E.A., TREMARIN, P.I., MOREIRA-FILHO, H. & LUDWIG, T.A.V. Thalassiosirales (Diatomeae) from Guaratuba bay, Paraná state, Brazil. Biota Neotrop. 10(2): http://www.biotaneotropica.org.br/v10n2/en/ abstract?inventory+bn03310022010.Abstract: A survey of the Thalassiosirales from three different regions of Guaratuba bay resulted in the identification of 28 infrageneric taxa. The samples were collected every three months from April 2007 to January 2008. The taxa were described and illustrated by optical. Some of them were illustrated by scanning electron micrographs. Taxonomic comments were added when relevant. Thalassiosira cedarkeyensis was first recorded to Brazil and two Thalassiosira ferelineata and T. minuscula were new citations to Parana state. Comparing the occurrence of Thalassiosirales representatives from 1961's previous work 23 species were added to the flora. Based on literature informations, only four species were considered from freshwater habitat, Discostella stelligera, Cyclotella meneghiniana, Cyclostephanos invisitatus and Thalassiosira rudis, the others were marine or estuarine.

In the present study, two new species of Nitzschia Hassall, Nitzschia pusilluhasta sp. nov. and Nitzschia australodesertorum sp. nov. are described from reservoirs in the state of São Paulo southeast Brazil. The morphology of the new species was analysed using light and electron microscopy. Nitzschia pusilluhasta is distinguished from morphologically related species by its valve outline, the shape of apices and fibulae, the absence of a gap between central fibulae, and the density of striae and areolae. Nitzschia australodesertorum differs from morphologically similar species in its valve outline, the shape of apices and fibulae, the presence of a gap between the central fibulae, and the density of fibulae and striae. The morphology and ecology of the new species are discussed and compared with morphologically related taxa. Information on the co-occurrence of other diatom species in the samples is also provided.

O ensaio objetiva refletir de que maneira as microalgas podem ser teoricamente concebidas e metodologicamente utilizadas como instrumento biotecnológico de sensoriamento responsável por aumentar capacidade de percepção/ação/cognição e comunicação acerca das dinâmicas antrópicas da natureza – considerando, em termos epistemológicos, que a razão científica se afasta do senso comum na medida em que gera experiências instrumentalizadas entre sujeito-objeto do conhecimento. Também ampliam e corrigem as experiências fenomenológicas limitadas às capacidades humanas circunscritas a regras neurofisiológicas e neuropsicológicas do corpo humano, ou às lógicas técnico-científicas de outras áreas do saber ligadas à política. Elas funcionam como biotecnologias capazes de fazer crescer e de corrigir a inteligência e a sensibilidade de sistemas teórico-metodológicos aplicados em planos de diagnóstico, monitoramento e ajustes ambientais. Enquanto biotecnologias, as microalgas funcionam como prolongamentos e potencializadores dos corpos e dos cérebros dos cientistas ou das comunidades acadêmicas reunidas no interior das Ciências do Ambiente. Por fim, considera alguns obstáculos epistemológicos que impedem a participação dos bioindicadores na esfera das políticas voltadas à gestão ambiental.

RESUMO Foi realizado um levantamento florístico de Epithemia (Bacillariophyceae) na área do Parque Estadual das Fontes do Ipiranga (PEFI), São Paulo, SP, Brasil, com o objetivo de conhecer a diversidade taxonômica e a variabilidade morfológica do gênero. Ao total, 31 lâminas de diatomáceas foram examinadas das quais cinco foram usadas no presente estudo. Cinco espécies foram identificadas: E. proboscidea Kützing, E. gibba (Ehrenberg) Kützing, E. gibberula (Ehrenberg) Kützing, E. operculata (C. Agardh) Ruck & Nakov e Epithemia sp., com dominância de espécies perifíticas. Um táxon foi registrado pela primeira vez para o Brasil (E. proboscidea Kützing) e dois táxons para a área do PEFI (E. gibba (Ehrenberg) Kützing e E. operculata (C. Agardh) Ruck & Nakov).

A bstract: The actual status of the progress and the main aspects of diatom studies in Brazil remain unknown. This paper describes a survey of published studies addressing material of Brazilian origin in non-marine aquatic environments. Our objectives are to (1) summarize and categorize diatom research topics, (2) to describe how related studies evolved and developed over time, as well as respective journals, (3) to identify the most studied regions and environments, and (4) to indicate the main institutions and works addressing diatom research and related interactions. We conducted a systematic review selecting 478 studies. Since the early studies, the approach on diatom fl oristic exclusively was the most frequent, even though, ecological studies have been increasing since the 2000s. However, these concentrate in the southern and southeastern. It was only in the last decades that other Brazilian regions became the setting of more extensive samplings, thus refl ecting on the interactions between authors and institutions from the collection sites. However, the actual biodiversity scenario of diatoms in Brazil still seems to be underestimated, which may infl uence further conservation measures. Finally, we indicate some suggestions aimed at fi lling the sampling gaps presented/highlighted in this study.