The big bag-like Asplanchna (top left) is a predator. Ptychura builds a tube-like house from its own excrement. The needle-like body of Kellicottia longispina is a free swimming species. Top right is a stretched Rotaria sp. that walks instead of using its crown of cilia to propel itself. The rotund body of Synchaeta (left center), is a predatory rotifer.

Below center shows one of the commonest rotifers, Brachionus sp. (prob. B. calyciflorus) Below right: Keratella quadrata

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