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Chordates
Principles II Final
30
Biology
Undergraduate 1
12/10/2009

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Term
bilateral
Definition
chordates are known for this kind of symmetry
Term
chordates
Definition
animals with in Bilateria that belong to the clade Deuterostomia are generally known as_______
Term
lancelets and tunicates
Definition
chordates include which 2 subphyla?
Term

 

  1. notochord
  2. dorsal, hollow nerve cord
  3. pharyngeal slits/clefts
  4. muscular post-anal tail

 

Definition
what are the 4 key characteristics or chordates?
Term
notochord
Definition
this skeletal structure is a longitudinal, flexible rod located between the digestive tube and nerve sord
Term
in the gelatinous discs in between vertebrae
Definition
notochords in human are located where?
Term
notochord
Definition
this structure is composed of fluid-filled cells encased in fibrous tissue and provides skeletal support
Term
dorsal, hollow nerve cord
Definition
this structure of chordates develops into brain and spinal cord. 
Term

solid

ventrally located

Definition
nerve cords of other animals (excluding chordates) are__________ and ______
Term
pharyngeal clefts
Definition
grooves along the sides of the pharynx that develop into slits that open to the outside of the body
Term
pharyngeal slits
Definition
structures that allow water entering the mouth to exit the body without padding through the entire digestive tract
Term
suspension feeding devices
Definition
pharyngeal slits in invertebrates develop into
Term
gill slits
Definition
pharyngeal slits in vertebrates develop into
Term
parts of ear and other structures on head/neck
Definition
pharyngeal slits in tetrapods develop the________
Term
muscular, post anal tail
Definition
this characteristic of chordates is reduced in the embryo of most chordates
Term
swimming in aquatic species
Definition
the muscular post-anal tail contains skeletal elements and muscles aiding_________
Term
somites
Definition
these are blocks of mesoderm that develop the muscles found along each side of the notochord in lancelets
Term
cephalochordata
Definition
lancelets belong to this subphylum of chordates
Term
lancelets
Definition
these invertebrates have a blade like shape and are rare on earth but common in tampa bay
Term
swim up then sink down trapping plankton in pharyngeal slits
Definition
how do lancelets feed?
Term
cilia
Definition
lancelets have_____ that takes in water, trapping food particles in slits
Term
anterior
Definition
adult lancelets bury themselves in sand with just the  ________ end sticking up outta the sand
Term
urochordata
Definition
tunicates belong to this subphylum of chordates
Term
tunicates
Definition
________ is closer related to other chordates than lancelets
Term
tunicates
Definition
these organisms settle of a substrate and undergo radial metamorphosis
Term

  1. tail and notochord resorbed
  2. nervous system degenerates
  3. organs rotate 90o

Definition
__________ happens during radial metamorphosis (3 pats)
Term
incurrent siphon
Definition
in tunicates the _________ draws water through pharyngeal slits and out through the excurrent siphon
Term
"sea squirts"
Definition
tunicates are commonly referred as _______?
Term
9
Definition
how many hox genes to tunicates have?
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