Further information: The authors divide the bilaterians in three informal groups: • (phyla Platyhelminthes, Gastrotricha, Entoprocta, Gnathostomulida, Cycliophora) • (or pseducoelomate, phyla Rotifera, Kinorhyncha, Nematoda, Nematomorpha, Acanthocephala, Loricifera) • (or eucoelomates, phyla Nemertea, Priapula, Annelida, Sipuncula, Echiura, Onychophora, Tardigrada, Arthropoda, Mollusca, Phoronida, Ectoprocta, Brachiopoda, Echinodermata, Chaetognatha, Hemichordata, Chordata). Several groups traditionally viewed as having a blastocoelomate condition are viewed here as acoelomates (e.g.,,, ).
Some of the coelomates groups (e.g.,, ) have greatly reduced celomic spaces; often the main body cavity is a bloodfilled space called a hemocoel, and is associated with an open circulatory system. The, and are viewed as.
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Brusca; Gary J. Brusca Article (PDF Available) in Systematic Zoology 40(2):245-247 January 1991 with 13,522 Reads.