One member of this phylum, Habrotrocha angusticollis, is relatively unique because fossil records of it from a peat deposit in the Pleistocene era have been excavated.  
One member of this phylum, Habrotrocha angusticollis, is relatively unique because fossil records of it from a peat deposit in the Pleistocene era have been excavated.  Only two species of this phylum's primitive Seisonidea order are known to exist, and certain members of the Monogononta order of this phylum lack males, so they reproduce via parthenogenesis. Members of this phylum are sometimes placed into a Pseudo-coelomata group with the genetically similar acatho-cephalans.  Their trophi and mastax are used to ingest food that they bring in with the help of the corona of cilia surrounding their mouths, which also can propel them and whose shape provides their name.  FTP, identify this phylum of very small aquatic animals whose name derives from the Latin for "wheel bearer."
One member of this phylum, Habrotrocha angusticollis, is relatively unique because fossil records of it from a peat deposit in the Pleistocene era have been excavated.  
{Rotifera} [or {Rotifer}s]