Lab 10: Chordata Flashcards
Why are adult tunicate’s called “sea squirts”?
they squirt water out of their excurrent siphon when disturbed
What phylum are chordata most closely related to?
Echinodermata
What kind of symmetry do chordates have?
bilateral
Do chordates have a coelom?
yes
What are the four characteristics that all chordates share at some point in their life?
-Notochord
-Dorsal, hallow nerve cord
-Pharyngeal slits
-Postanal tail
What are the two subphylum of invertebrate chordates?
-Urochordata
-Cephalochordata
A transitional fossil is:
a fossil that has some ancestral characteristics and some newly derived characteristics.
Which of the following is a tetrapod but not an amniote? Choices: Frog, snake, bird, badger
frog
The pattern in the limbs of tetrapods described by Neil Shubin in the video (one bone, two bones, lots of little bones, digits) is evidence that:
the limbs of a bird, lizard, frog, human are homologous.
Which of the following is chordates closest relative? Choices: sea star, squid, horseshoe crab
Sea star
Which of the following is an invertebrate chordate? Choices: tunicate(sea squirt), hagfish, lamprey, shark
tunicate (sea squirt)
An agnathan is:
a chordate without jaws
What does this description match:
The chordate hallmark that is a a flexible rod supporting the bodies of chordate embryos and is retained or modified in some adult chordates.
notochord
Mammal clade that gives birth to young that are nourished for a very short time by the placenta and then finish development in a pouch.
Marsupial
Which mammal clade lays eggs?
Monotreme
Which mammal clade gives birth fo fully developed young that were nourished through development by the placenta.
Eutherian
What kind of heart does a frog have?
Three chambered
What kind of heart does a horse have?
Four chambered
What kind of heart does a chicken have?
Four chambered