Urceolus
''Urceolus'' (, 'pitcher') is a genus of heterotrophic flagellates belonging to the Euglenozoa, a phylum of single-celled eukaryotes or protists. Described by Russian biologist Konstantin Mereschkowsky in 1877, its type species is ''Urceolus alenizini''. Species of this genus are characterized by deformable flask-shaped cells that exhibit at least one flagellum that is active at the tip, arising from a neck-like structure that also hosts the feeding apparatus. They are found in a variety of water body sediments across the globe. According to molecular phylogenetics, evolutionary studies, ''Urceolus'' belongs to a group of Euglenozoa known as peranemids, closely related to the euglenophyte algae. Description ''Urceolus'' species are single-celled eukaryotes or protists. Their cell (biology), cells are sack-shaped, narrow at the anterior (anatomy), anterior end and expanded at the posterior (anatomy), posterior end. The cells exhibit flexibility and squirming movements, more vig ...
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