I have found these in my microarthropod samples in Alaska. I couldn't id them but someone suggested it was a rotifer.
Yes, it seems like a Brachionus plicatilis, but I'm not 100% sure.
If you want you can sign up in Inaturalist. In this website you can search the common and the scientific names of this and other forms of life.
https://www.inaturalist.org/
Hi Robin, an interesting record, and indeed a rotifer, of subclass Bdelloidea! It is one of the rare cases of bdelloids that can be recognized in contracted stage, by its bizarre and diagnostic appendages: Macrotrachela multispinosa Thompson, 1892, a highly variable species. Your variant comes closest to ssp. crassispinosa, but deviates in some points. Compare, http://rotifera.hausdernatur.at/Species/Index/2587 . Can you provide some info on ecology, i.e. in which habitat was it sampled?
It was collected in the floodplain of the Tanana River. I believe that came from an individual collected in a high gradient extracted 5cm X 5cm soil sample possibly in a white spruce stand. I found one very similar in a white spruce stand recently but I am not 100 percent certain of the origins of that particular photo beyond it was floodplain collected (it taken some time ago).
It is definitely Macrotrachela multispinosa as it was told by Christian D. Jersabek.
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