• Richard C Brusca

Further information: The authors divide the bilaterians in three informal groups:. (phyla Platyhelminthes, Gastrotricha, Entoprocta, Gnathostomulida, Cycliophora).

Richard C Brusca

(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).

Online file sharing and storage. Welcome to Richard C. Brusca’s web site. Rick is an invertebrate zoologist. (Invertebrates, Sinauer Associates; available in four. Full-text (PDF) Invertebrates. By Richard C. Brusca; Gary J. Brusca See all › 1 Reference. Download citation. Download full-text PDF. Join for free.

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.