The Deuterostomia Flashcards
1
Q
What are the main phyla within the deuterostomes?
A
Echinoderms
Hemichordates
Chordates
2
Q
What are the commonalities of the Deutersotomes?
A
- second hole in embryo forms mouth
- radial cleavage
3
Q
What are the taxa within the Echinoderms?
A
- Asteroids (starfish)
- Ophiuroids (brittle stars)
- Echinoids (sea urchins)
- Holothurians (sea cucumbers)
- Crinoids (sea lilies)
4
Q
What is the basic anatomy of echinoderms?
A
- pentaradial symmetry
(imperfect due to medrapolite) - Oral end on bottom
aboral end on top - water vascular system
- endoskeleton (made of calcium carbonate ossicles)
5
Q
How do Ophiuroids differ from asteroids?
A
- movable arms
- dirtirus feeders
- no anus
6
Q
How do Echnoids differ from asteroids?
A
- spieks
- Pedicellariea (small pincers)
- inside dominated by aristotles lantern
(ossicular and muscular feeding structure)
7
Q
How do Holothurians differ from asteroids?
A
- Defensive Cuvier tubes
8
Q
What are the two defining classes of Hemichordates?
A
- Euteropneusts
- Pterobrachs
9
Q
What is the general structure of Chordates
A
- Pharyngeal slits
- Dorsal hollow nerve cord
- Notochord
- Endostyle
- postanal tail
- lateral muscles
10
Q
What is a notochord?
A
Stiffened rod that runs underneath the nerve cord
11
Q
How are chordates seperated?
A
Vertebrates
Invertebrates
12
Q
What are the two main taxa of invertebrate chordates?
A
Tunicates
Ceohalochodates
