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  1. Copilot Answer
    DomainEukaryota
    KingdomAnimalia
    ClassCatenulida
    Description

    The anatomy of catenulids is simple and lacks hard parts. The mouth is located anteriorly and connects to a simple pharynx and a simple intestine that forms a ciliated sac. They possess two pairs of nerve cords and often a … See more

    Ecology

    All catenulids are aquatic, benthic animals. Most of them live in freshwater, being usually very abundant in mires, ponds, streams and moist terrestrial habitats. A small number of species are known to live in the sea. … See more

    Phylogeny

    The monophyly of Catenulida is supported by molecular studies and by at least three synapomorphies: the unpaired protonephridium, the unpaired and anterodorsally located testis and the nonmobile … See more