-
Chordata
- "cord"
- pharyngeal slits
- notocord
- post anal muscular tail
- dorsal and hollow nerve tube
- endostyle
-
Chordate subphyllums
- Urochordata
- Cephelachordata
-
Post-anal muscular tail
continuation of the body beyond the anus
-
endostyle
- glandular organ in the ventral pharynx
- secretes mucus
- for feeding
-
-
cloaca
- "sewer"
- when rectum receives things from gut, gonoduct and excratory duct
-
system
- zooid orderings/ group formations
- separate oral opening and a common atrial opening
-
stigmata
- numerous ciliated slits in the pharynx
- allow water to move from pharynx to atrium
-
compound ascidians
zooids are completely embedded except for their openings in a tunic
-
Thaliacea
- "plenty"
- salp like tunicate
- jet propulsion, circular muscles
- includes classes: Salpidacea, Doliolidae, Pyrosomes
-
doliolids
- complete circular muscles
- multiple pharyngeal slits
- stolon produces buds
- blastozooid
-
Urochordata
- subphyllum: Tunicata
- "tail cord"
- invertebrate chordates
- filter feeding
- tunic forming
- monoecious
-
Urochordata classes
- Ascidiacea
- Thaliacea
- Appendicularia (larvacea)
-
Pharyngeal gill slits
- openings in pharynx
- excretion
- respiratory exchange
-
oral siphon
- buccal siphon
- water goes in
-
dorsal lamina
- ciliated ridge
- rolls mucus and traps food into string
- captured stuff is moved into esophagous
-
tunic
- external connective tissue covering epidermis
- thick but varies is consistency
-
atrium
sac like chamber that collects water
-
gill bar
exoskeleton in Pharynx which water passes through
-
Ascidians
- "little wine skin"
- sea squirts
- benthic tunicates
- tunic surrounds and supports body
- is toxic and with spicules
-
Larvacea
- "ghost"
- appendicularian
- tadpole larva morphology
- mucus house net
- seperate gonoducts for each gamete
-
pyrosomes
- "firebody"
- biolumenescent
- colonial
- cloaca
-
larvacean house
mucus net house for Larvaceas
-
Dorsal hollow nerve cord
- extends from anterior brain to tail
- nervous system
-
notochord
- flexible thin stiffened rod
- skeletal support structure
-
oral tentacles
- buccal tentacles
- prevent large items from getting into siphon openings
-
solitary ascidians
- simple zooids
- do not form colonies
- small in size
-
salps
- alt. generations
- mucus net
- stolon
-
spur
- tail like appendage
- holds blastozooids and oozoids
-
deploying points
groups separated blastozooid buds along the stolon
-
stolon
- attatchemnt appendage
- organ near heart
- blastozooids from on its side
-
luminescent organ
- appendage that lies on each side of the pharynx
- contains luminescent bacteria
- lights up when disturbed
-
-
Salpida lifecycle
- oozoid (asexual)
- blastozooid (first colonial zooids)
-
Doliolida lifecycle
- tadpole larva
- trophozooid (feeding)
- phorozooid (locomotion)
- gonozooid (reproductive)
- oozoid (asexual)
-
Pyrosomida life cycle
- zygote
- cythozooid (underdeveloped)
- blastozooid (colonial)
- oozoid (asexual)
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