Kuwanikwa kweCastorocauda lutrasimilis chiratidzo chekutanga chekuti hama yepedyo yezvipembenene yakashandiswa mumvura dinosaurs vasati varasikirwa nehutongi makore 66 mamiriyoni apfuura, vachisundira kumashure zuva rinofungidzirwa rehama dzemhuka dzakajairika kune mararamiro e-aquatic ne 110 mamiriyoni emakore. Zvichibva pane fossils anozivikanwa iye zvino, mutsetse wemhuka haungaone imwe semi-aquatic fomu inoshanduka kusvikira kuEocene. Nemhaka yokuti zvishoma zvisaririra zvakasara zvakawanikwa, zvaimbofungidzirwa kuti, kusvikira kuCretaceous <unk> Paleogene muganhu (K<unk>Pg muganhu), mhuka dzose dzaiva duku, dzinogara pasi kana kuti dzinogara mumiti, mhuka dzeusiku dzakafanana ne shrews, hedgehouses, treeshrews, kana tenrecs.
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