The tardigrade was chosen as a model system in part because embryos and animals are optically clear at all stages, facilitating the viewing and filming of internal processes. Multiplane video recordings under differential interference contrast (DIC) microscopy have allowed early embryonic cell lineages to be reconstructed through seven rounds of division and have revealed invariant patterns of asymmetric cell divisions, nuclear migrations, and cell migrations. Here, we present a protocol for filming embryonic development of by DIC microscopy.
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