Phylum Hemichordata Subphylum Urochordata Subphylum Cephalochordata

PHYLUM CHORDATA

I. Subphylum Urochordata
A. Class Ascidiacea
B. Class Larvacea
C. Class Thaliacea
II. Subphylum Cephalochordata
III. Subphylum Vertebrata

SUBPHYLUM UROCHORDATA

all species are marine
specialists at feeding on suspended matter
Urochordates literally means "tail backstring"
"tunicates"
I. Subphylum Urochordata
A. Class Ascidiacea
B. Class Larvacea
C. Class Thaliacea

Class Ascidiacea	Class Larvacea
Class Thaliacea	Sea Squirts

I. Integument: tunic
II. Digestive
- incurrent siphon, tentacles, branchial basket, stigmata, endostyle, esophagus, stomach, intestine, atrium, anus, excurrent siphon
III. Reproductive
- gonads
IV. Nervous
- cerebral ganglion, subneural gland
V. Circulatory
- heart, blood vessels, blood
VI. Excretory
- excurrent siphon

Sea Squirts

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