Oxyrrhis marina, a widely distributed marine protist, is used to model heterotrophic flagellate responses in microbial food webs. Although clonal variability occurs in protists, assessments of intraspecific diversity are rare; such assessments are critical, particularly where species are used as models in ecological studies. To address the extent of intraspecific variation within O. marina, we ...

The Iguazu river is a tributary of the left margin of the Paraná river, isolated from this basin about 22 million years ago with the appearance of the Iguazu Falls. The Iguazu river is characterized by high endemism due to two factors: its rugged topography and the old isolation caused by formation of the Iguazu Falls. This study analyzed cytogenetically a population of Glanidium ribeiroi colle...

Diatoms have been classified historically as either centric or pennate based on a number of features, cell outline foremost among them. The consensus among nearly every estimate of the diatom phylogeny is that the traditional pennate diatoms (Pennales) constitute a well-supported clade, whereas centric diatoms do not. The problem with the centric–pennate classification was highlighted by some r...

Agave Linnaeus, 1753 is endemic of America and is considered one of the most important crops in Mexico due to its key role in the country's economy. Cytogenetic analysis was carried out in Agave tequilana Weber, 1902 'Azul', Agave cupreata Trelease et Berger, 1915 and Agave angustifolia Haworth, 1812. The analysis showed that in all species the diploid chromosome number was 2n = 60, with bimoda...

Prototheca richardsi is a protist of uncertain taxonomy which mediates growth inhibition in anuran larvae. Cells of P. richardsi were isolated from tadpole faeces and DNA was purified by Qiagen chromatography. Nuclear small-subunit (18S) rDNA (ssu-rDNA) was amplified by PCR using universal primers, cloned, and six clones (two from each of three separate isolates) were sequenced. All clones yiel...

Bathynellacea including the parabathynellid genus Allobathynella Morimoto & Miura, 1957 is commonly found across subterranean environment. The most species-rich known in Korea, and it now contains 23 species one subspecies from South Korea Japan. In this paper, we described a new of Danyang, Korea. danyangensis sp. nov. can be distinguished its congeners by presence five simple setae on ant...

Abstract Crangonyx apalachee n. sp. Cannizzaro & Sawicki in Cannizzaro, Sisco Sawicki, is described from Lake Jackson Leon County, Florida, USA, a prairie lake that periodically drains through karst sinkholes during times of low rainfall. The new species occurs tall grass along the lake’s shoreline. Molecular analyses nuclear 18S rDNA and 28S with mitochondrial 16S rDNA, combined morphologi...

A myxozoan parasite belonging to the genus Thelohanellus Kudo, 1933 (Cnidaria, Myxosporea, Bivalvulida) was isolated from the fins of Labeo dero inhabiting Ranjit Sagar Wetland, Punjab, India. The plasmodium was 0.5-0.7 mm in diameter each containing 80- 100 number of myxospores. Myxospores were egg shaped to ovoidal in valvular view having bluntly pointed anterior and broad rounded posterior e...