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Holozoa
Holozoa () is a clade of organisms that includes animals and their closest single-celled relatives, but excludes fungi and all other organisms. Together they amount to more than 1.5 million species of purely heterotrophic organisms, including around 300 unicellular species. It consists of various subgroups, namely Metazoa (or animals) and the protists Choanoflagellata, Filasterea, Pluriformea and Ichthyosporea. Along with fungi and some other groups, Holozoa is part of the Opisthokonta, a supergroup of eukaryotes. Choanofila was previously used as the name for a group similar in composition to Holozoa, but its usage is discouraged now because it excludes animals and is therefore paraphyletic. The holozoan protists play a crucial role in understanding the evolutionary steps leading to the emergence of multicellular animals from single-celled ancestors. Recent genomic studies have shed light on the evolutionary relationships between the various holozoan lineages, revealin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Syssomonas
''Syssomonas'' is a monotypic genus of unicellular flagellated protists containing the species ''Syssomonas multiformis''. It is a member of Pluriformea inside the lineage of Holozoa, a clade containing animals and their closest protistan relatives. It lives in freshwater habitats. It has a complex life cycle that includes unicellular amoeboid and flagellated phases, as well as multicellular aggregates, depending on the growth medium and nutritional state. Life stages ''Syssomonas multiformis'' is a species of unicellular protists with naked cells (lacking any Test (biology), shell or scales) that presents with a variety of life forms during their complex Biological life cycle, life cycle. These forms include: round flagellate cells (7–14 μm in diameter) with one posterior (anatomy), posterior flagellum, amoeboflagellate (i.e. with both flagella and pseudopodia) cells, amoeboid non-flagellar cells, and spherical microbial cyst, cysts. They can also form clusters of multiple ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
