Cristatella mucedo is a in the family Cristatellidae, and the only species of the genus Cristatella. Cristatella mucedo They are noted for their elongated shape and colorless, transparent bodies.
Populations in Europe are genetically relatively homogeneous, perhaps reflecting postglacial colonization representing a single lineage. In contrast, North American populations are highly diverse. There is some evidence of two different major lineages, perhaps representing cryptic species or subspecies, with hybridization that have boosted genetic diversity. Some colonies have shown capabilities in sexual reproduction in brief instances.
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