Chordata Flashcards
(88 cards)
5 key features present at some point in development
Notochord
Dorsal hollow nerve cord
Pharyngeal gill slits/arches
Post-anal tail
Endostyle
Notochord is ___ derived
Mesoderm
Notochord is a flexible ___ structure found between the ___ and ___
rod-shaped, digestive tube, nerve cord
Notochord is present in ___ chordate embryos, some ___ chordates have it
All, adult
Dorsal hollow nerve cord is ___ derived
Ectoderm
Dorsal hollow nerve cord is a ___ found dorsal to the ___ and ___
Hollow tube, digestive tract, notochord
Dorsal hollow nerve cord develops into the ___ and ___
brain, spinal cord
Pahryngela gill slits are slits in the ___ that open to the ___
pharynx, environment
Pharyngeal gill slits allow ___ to exit during ___
water, feeding
Pharyngeal gill slits become gill ___ in fishes and components of the ___ and ___ in tetrapods
supports, ear, tonsils
Post-anal tail is the elongation of the body that extends beyond the ___
anus
Post-anal tail contains ___ and ___ for movement in aquatic species
Skeletal elements, muscles
Post-anal tail aids in ___ and ___ in terrestrial species
balance, locomotion
Post-anal tail is ___ in some species
reduced
(Chordate) 3 subphyla
Urochordata, Cephalochordata, Vertebrata
___ and ___ are considered protochordates
Urochordata, Cephalochordata
(Protochordates) Urochordata
Tunicates/sea squirts
(Urochordata) Covered in a cellulose-like material called the ___
tunic
(Urochordata) Adult form lacks the ___, ___, and ___, these are present in ___
notochord, dorsal hollow nerve cord, post-anal tail, larva
(Urochordata) Larvae are ___, adults of most species are ___
free-swimming, sessile
(Urochordata) ___ feeders
Suspension
(Urochordata) Most are ___
monoecious
Cephalochordata
lancelets
(Cephalochordata) Possess all characteristics as an ___
adult
