The taxonomy of invertebrates as proposed by Richard C. Brusca and Gary J. Brusca in 2003 is a system of classification with emphasis on the invertebrates, in other words, a way to classify animals, primarily those which have no backbone.
Kingdom Eubacteria (Bacteria)
Kingdom Archaea (Archaebacteria)
Kingdom Fungi
Kingdom Plantae (= Metaphyta)
Kingdom Protista
Phylum Porifera
Phylum Porifera
Phylum Placozoa
Phylum Placozoa
Phylum Monoblastozoa
Phylum Monoblastozoa
Phylum Rhombozoa
Phylum Rhombozoa
Phylum Orthonectida
Phylum Orthonectida
Radiata
Phylum Cnidaria
Phylum Cnidaria
Phylum Ctenophora
Phylum Ctenophora
Bilateria
The authors divide the bilaterians in three informal groups:
acoelomates (phyla Platyhelminthes, Gastrotricha, Entoprocta, Gnathostomulida, Cycliophora)
blastocoelomate (or pseducoelomate, phyla Rotifera, Kinorhyncha, Nematoda, Nematomorpha, Acanthocephala, Loricifera)
coelomates (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., Gastrotricha, Entoprocta, Gnathostomulida).
Some of the coelomates groups (e.g., Arthropoda, Mollusca) 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 Brachiopoda, Ectoprocta and Phoronida are viewed as lophophorates.
In a phylogeny, the bilaterians are divided in:
Protostomia
Deuterostomia
Phylum Platyhelminthes
Phylum Platyhelminthes
Phylum Nemertea
Phylum Nemertea
Phylum Rotifera
Phylum Rotifera
Phylum Gastrotricha
Phylum Gastrotricha
Phylum Kinorhyncha
Phylum Kinorhyncha
Phylum Nematoda (= Nemata)
Phylum Nematoda (= Nemata)
Phylum Nematomorpha
Phylum Nematomorpha
Phylum Priapula
Phylum Priapula
Phylum Acanthocephala
Phylum Acanthocephala
Phylum Entoprocta (= Kamptozoa)
Phylum Entoprocta (= Kamptozoa)
Phylum Gnathostomulida
Phylum Gnathostomulida
Phylum Loricifera
Phylum Loricifera
Phylum Cycliophora
Phylum Cycliophora
Phylum Annelida
Phylum Annelida
Phylum Sipuncula
Phylum Sipuncula
Phylum Echiura
Phylum Echiura
Phylum Onychophora
Phylum Onychophora
Phylum Tardigrada
Phylum Tardigrada
Phylum Arthropoda
Phylum Arthropoda
Phylum Mollusca
Phylum Mollusca
Phylum Phoronida
Phylum Phoronida
Phylum Ectoprocta (= Bryozoa)
Phylum Ectoprocta (= Bryozoa)
Phylum Brachiopoda
Phylum Brachiopoda
Phylum Echinodermata
Phylum Echinodermata
Phylum Chaetognatha
Phylum Chaetognatha
Phylum Hemichordata
Phylum Hemichordata
Phylum Chordata
Phylum Chordata
