Syndermata has a very low representation in the fossil record. This is due mainly to the fact that they are small, usually microscopic, soft-bodied animals. Until recently, fossils could only be found dated to the Holocene era, which only goes as far back as 8000 years.
In 1991, Bdelloid rotifers have been identified within fossilized amber taken from a Dominican mine. The amber from this mine is estimated to be 30 to 40 million years old.
For a more indepth read on the subject, check out the article:
G. O. Poinar Jr and C. Ricci. 1992. Bdelloid rotifers in Dominican amber: Evidence for parthenogenetic continuity. Experientia 48 : 408 -410
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