CHART II: ANIMAL KINGDOM
Divisions
Estimated
Number
of Species
d
Taxonomic Classifications
Protozoa
15,000
(acellular animals)
Mesozoa
—
Porifera
5,000
(sponges)
Coelenterata
10,000
(coelenterates)
Ctenophora
100
(comb jellies)
Platyhelminthes
6,000*)
(flat worms)
Nemertinea
500 \
(nemertine worms)
Aschelminthes
a
Acanthocephala
a
Entoprocta
b
Ectoprocta
b
(moss animals)]
Phoronida
Brachiopoda
(lamp shells)
Mollusca
(mollusks)
Sipunculoidea
Annelida
c
(segmented worms)
Arthropoda
(arthropods)
Chaetognatha
(arrow worms)
Echinodermata
(echinoderms)
Hemichordata
Chordata
(including
)>
60,000
vertebrates)
}
Radiata
15
120
►Acoelomates
7,ΟΟθ|
/•Pseudocoelomates
3,000
HProtostomia/
70,000 i
►Schizocoela
»Bilateria
6,500 >Eucoelomates\
750,000
30
1
5,000
^•Enterocoel a > Deuteros tomia I
a Includes Rotifera, Gastrotricha, Kinorhyncha,
loidea. Formerly called Nemathelminthes.
b Formerly in Bryozoa.
c Includes Echiuroidea.
d Taken from "Handbook of Biological Data" (4),
Nematoda, Nematomorpha, Priapup. 533.
XXIV