I n the past 25 years, theories to explain the prevalence of sexual reproduction have
proliferated; according to one classification, 20 hypotheses have been put forward' …

The claim that eukaryotic micro-organisms have global geographic ranges, constituting a
significant departure from the situation with macro-organisms, has been supported by …

Background The duplication of genes can occur through various mechanisms and is thought
to make a major contribution to the evolutionary diversification of organisms. There is …

The Class Bdelloidea of the Phylum Rotifera is the largest metazoan taxon in which males,
hermaphrodites, and meiosis are unknown. We conducted a molecular genetic test of this …

Asexuals are an important test case for theories of why species exist. If asexual clades
displayed the same pattern of discrete variation as sexual clades, this would challenge the …

Rotifers of class Bdelloidea are common invertebrate animals with highly unusual
characteristics, including apparently obligate asexuality, the ability to resume reproduction …

Publisher Summary This chapter introduces general biology, ecology, and classification of
Rotifera. Phylum Rotifera comprises approximately 2000 species of unsegmented …

Bdelloid rotifers are microinvertebrates with unique characteristics: they have survived tens
of millions of years without sexual reproduction; they withstand extreme desiccation by …

In 1702, Van Leeuwenhoek was the first to describe the phenomenon of anhydrobiosis in a
species of bdelloid rotifer, Philodina roseola. It is the purpose of this review to examine what …

All freshwater eventually passes through or over sedimentary habitats on the way to oceanic
or atmospheric do-mains. These zones of freshwater sediments Contain an enormous …