- Radiata
- Bilateria
- Protostomia
- Acoelomorpha
- Platyhelminthes - Flatworms
- Nemertina - Ribbon worms
- Gastrotricha
- Gnathostomulida - Jawed worms
- Micrognathozoa
- Rotifera - Rotifers
- AcanthocephalaAcanthocephala is a group of cylindrical, thorny-headed parasitic worms that are found in many species of fishes, amphibians, birds, and mammals. About 500 modern species are known. There are several morphological characteristics that distinguish acanthoc
- PriapulidaPriapulida priapulid worms or penis worms are a phylum of marine worms with an extensible spiny proboscis. Priapulid fossils are known at least as far back as the Middle Cambrian. There nearest relatives are probably Kinorhyncha and Loricifera with which
- KinorhynchaCyclorhagida Homalorhagida Kinorhyncha (Gr. kinema motion + rhyncho snout) is a phylum of small (1 mm or less) marine pseudocoelomate invertebrates that are widespread in mud or sand at all depths as part of the meiobenthos. They are sometimes called mud
- LoriciferaLoricifera is a small phylum of marine sediment-dwelling animals with about a dozen known species. The phylum was discovered in 1983 by Reinhardt Kristensen. The animals have a head, mouth and digestive system as well as a set of specialized umbrella skel
- EntoproctaBarentsiidae (Urnatellidae) Loxokalypodidae Loxosomatidae Pedicellinidae Entoprocta (Gr. entos inside + proktos anus) is a phylum of small aquatic animals, ranging in size from 0. They have a lophophore, and as their name suggests, are distinguished from
- Nematoda - Roundworms
- NematomorphaNematomorpha (commonly known as horsehair worms are a phylum of parasitic animals morphologically and ecologically similar to nematodes. Animals. - Horsehair worms
- Cycliophora
- Mollusca - Mollusks
- Sipuncula - Peanut worms
- Annelida - Segmented worms
- Tardigrada - Water bears
- Onychophora - Velvet worms
- Arthropoda - Insects, etc.
- Phoronida
- Ectoprocta - Moss animals
- Brachiopoda
- Deuterostomia
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