Lecture 9.2 Introducing the Deuterostomes Flashcards
1
Q
Deuterosomes?
A
Mouth second
2
Q
What taxa are part of the Deuterosomes?
A
- Lophophorata
- Echinodermata
- Chordata
3
Q
What is Deuterosomes sister-taxon?
A
Protosomes
4
Q
Deuterosomes common ancestor had?
A
- bilateral symmetrical body
- segmentation
- pharynx with slits
5
Q
Hemichordates?
A
Worm like marine animals
has three sections (Trunk, collar, proboscis)
Have pharyngeal slits: water goes in threw the mouth and exits via the slits
6
Q
Echinoderms?
A
- Pentaradial symmetry
- water vascular system
- tube feet, spine
- Endoskeleton of CaCO3
- As Larvae they are bilaterally symmetrical
7
Q
madreporite?
A
Sea star has a madreporite that lets water come into its vascular system
8
Q
Echinodermata Examples?
A
- Brittle Stars (Ophiuroids)
- Sea Stars (Asteroids)
- Sea Urchins (Echinoids)
- Sea cucumbers (Holothuroids)
- Feather star (Crinoids)
9
Q
Chordates?
A
- Bilaterally symmetrical
- coalomate
- segmented
Includes Vertebrates and 2 Invertebrates
10
Q
Four key traits of Chordates?
A
- Notochord
- skeletal-like structure composed of large, fluid-filled cells
- Dorsal, hollow nerve cord
- Pharygeal slits
- Muscular, post-anal tail
11
Q
Invertebrates?
A
- Cephalochordates
- transperent fish
- Urochordates
- sessile
- tadpole larval stage
12
Q
Vertebrae?
A
the synapamorphy of vertebrates
