Ultrastructure of Aulacoseira brasiliensis sp. nov. (Coscinodiscophyceae) and comparison with related species.
- P. I. Tremarin, Thelma Ludwig Alvim Veiga, L. C. Torgan
- Biology
- 2012
Aulacoseira brasiliensis was found in lotic and lentic environments of tropical and subtropical regions from Brazil and is characterized by forming short chains linked by ovate-attenuate spines, rounded areolae occluded by vola, undeveloped ringleist and sessile rimoportulae arranged in two circumferential alternate rows.
Species of Luticola D.G. Mann (Bacillariophyceae) in the Atlantic Forest rivers from southern Brazil
- Arielli Straube, P. I. Tremarin, T. A. Ludwig
- Biology
- 2 October 2017
The morphology of 18 species of Luticola under optical and scanning electron microscopy, from 15 rheophilic environments of an Atlantic Forest in southern Brazil are illustrated and compared with morphologically similar species.
Ultrastructure and distribution of Aulacoseira gessneri
- P. I. Tremarin, S. Loverde‐Oliveira, T. A. Ludwig, L. C. Torgan
- Environmental Science
- 1 June 2011
The species reached high biomass both during the high and low water periods in Pantanal lakes, and its morphology compared with similar species, A. distans (Ehrenberg) Simonsen and A. muzzanensis (Meister) Krammer.
Taxonomic studies of centric diatoms (Diatomeae): unusual nanoplanktonic forms and new records for Brazil
- K. P. Cavalcante, P. I. Tremarin, T. A. Ludwig
- Environmental Science
- 1 June 2013
This is the first study focusing on centric diatoms in the flora of the state of Bahia, in northeastern Brazil, and presents a detailed light, transmission and scanning electron microscopy analysis of Skeletonema potamos, a diatom rarely found in the Brazilian literature.
Acanthoceras and Urosolenia species (Diatomeae) in subtropical reservoirs from South Brazil: Ultrastructure, distribution and autoecology
- P. I. Tremarin, E. G. Freire, V. M. Algarte, T. A. Ludwig
- Environmental Science
- 1 March 2015
Cellular densities differed among evaluated reservoirs showing strong correlations with inorganic nitrogen concentrations, N/P ratio and temperature and confirmed that species respond strongly to local environmental gradients.
Nupela (Bacillariophyceae) in littoral rivers from south Brazil, and description of six new species of the genus
- P. I. Tremarin, Arielli Straube, T. A. Ludwig
- Biology
- 22 April 2015
The goal of this article is to identify and describe the morphology of Nupela species, under light and electron microscopy, found in the rivers of the Atlantic Forest from southern Brazil.
THALASSIOSIRA RUDIS SP. NOV. (COSCINODISCOPHYCEAE): A NEW FRESHWATER SPECIES
- T. A. Ludwig, P. I. Tremarin, V. Becker, Lezilda C. Torga
- Biology
- 1 November 2008
The centric diatom Thalassiosira rudis sp. nov. has been described by morphological and ultrastructural analyses of the frustules using light and scanning electron microscopy. The species was found…
Four new Aulacoseira species (Coscinodiscophyceae) from Matogrossense Pantanal, Brazil
- P. I. Tremarin, T. A. Ludwig, L. C. Torgan
- Biology
- 14 February 2014
Examination of samples from two lakes in the Matogrossense Pantanal, midwest Brazil, revealed the presence of four new Aulacoseira species, A. pantanalensis Tremarin, Torgan & T. Ludwig, described and illustrated using light and scanning electron microscopy.
Aulacoseira calypsi sp. nov. (Coscinodiscophyceae) from an Amazonian lake, northern Brazil
- P. I. Tremarin, Rosildo Santos Paiva, T. A. Ludwig, L. C. Torgan
- Environmental Science
- 1 October 2013
A new diatom species is described from specimens in plankton samples from Água Preta lake, located in northern Brazil, which shares similarities as to frustule size, striation pattern, and narrowness of ringleist; but differs in the morphology of separation and linking spines, and the number and position of the rimoportulae.
Aulacoseira veraluciae sp. nov. (Coscinodiscophyceae, Aulacoseiraceae): a common freshwater diatom from Brazil
- P. I. Tremarin, T. A. Ludwig, L. C. Torgan
- Biology
- 7 November 2014
Examination of samples from different aquatic environments from Brazil revealed the presence of a new Aulacoseira species, characterized mainly by the straight pervalvar rows of areolae, morphology of the linking spines, shape and position of the rimoportulae on the valve mantle, deepness and thickness of the ringleiste.
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