1 Phylum Chordata Subphylum Urochordata (Tunicata) Subphylum Cephalochordata “Craniata” group Subphylum Vertebrata Superclass Agnatha Superclass Gnathostomata Class Placodermi Class Chondrichthyes Class Acanthodii Class Osteichthyes Class Amphibia Class Reptilia Class Mammalia Class Aves Urochordata Sessile filter feeder – cilia move water and food, filtering in pharyngeal ‘pouch’ (pharynx) Urochordata Water + Food In Gets filtered Water Out
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Phylum Chordata
Subphylum Urochordata (Tunicata)
Subphylum Cephalochordata
“Craniata” group
Subphylum Vertebrata
Superclass Agnatha
Superclass GnathostomataClass Placodermi
Class Chondrichthyes
Class Acanthodii
Class Osteichthyes
Class Amphibia
Class Reptilia
Class Mammalia
Class Aves
Urochordata
Sessile filter feeder – cilia move water and food, filtering in pharyngeal ‘pouch’ (pharynx)
Urochordata
Water + Food
In
Gets
filtered
Water
Out
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Endostyle – ciliated groove within pharynx
secretes mucous for food capture
metabolizes iodine - homologous to thyroid
Endostyle
UrochordataMonoecious (hermaphroditic) - each individual produces male and female gametes. Gametes
released
Urochordata
Tunic – polysacchrides w/tunicinsecreted by mantle
Adult lacks most chordate synapomorphies
Urochordata
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Urochordata larvae
Eyespot (ocellus) andstatocyst
Phylum Chordata
Subphylum Urochordata (Tunicata)
Subphylum Cephalochordata
“Craniata” group
Subphylum Vertebrata
-Superclass Agnatha
Superclass GnathostomataClass Placodermi
Class Chondrichthyes
Class Acanthodii
Class Osteichthyes
Class Amphibia
Class Reptilia
Class Mammalia
Class Aves
Motile filterfeeders
Ciliated wheel organ and pharynx
Notochord – “hydroskeleton”
Stiffness of notochord under neural control
Cephalochordata
amphioxus
Notochord extends
into anterior end
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Amphioxus
Tail musculature and associated nerves & vessels are segmented.