lab 9: Deutorostomes and chordates Flashcards
1
Q
Potostomes
A
- Spiral clevage
- Blastopore becomes the mouth
- Schizocoelous coelom
2
Q
Potostomes
Major phyla
A
- Mollusca, Annelida and Arthopoda
3
Q
Deuterostomes
A
- Radial Cleavage
- Blastopore becomes the anus
- Enterocoelous coelom
4
Q
Deuterostomes
Major Phyla
A
- Echinodermata and chordata
5
Q
In this week’s lab, we will examine
A
- Phylum: Echinodermata
- Class: Asteroida, Echinoidea
- Representative: Sea star, Sea urchin
6
Q
Deuterostome
A
- Coelom originates from gut outpouching
- Anus develops from the blastopore
7
Q
Phylum Echinodermata
Ancetsral Characters
A
- Bilateral symmetry
- Triplobastic
- Coelomates
- Blastopore becomes the anus
8
Q
Phylum Echinodermata
Derived characters
A
- Secondarily pentamerous radial symmetry
- Tube feet (water vascular system) no centralized nervous system
9
Q
Phylum Echinodermata
Five classes
A
- Asteroida, Crinoidea, Ophiuroidea, Echinoidea, Holothuroidea
10
Q
Asteroidea:
A
Startfish
11
Q
Ophiuroidea:
A
Brittle stars
12
Q
Crinoidea:
A
Feather stars
13
Q
Echinoidea
A
sea urchins
14
Q
Holothuria:
A
Sea cucumbers
15
Q
Phylum Echinodermata
class Asteroidea(sea stars)
A
Usually 5 arms, tube feet w/suckers, madreporite on aboral surface
16
Q
Phylum Echinodermata
Class Echinoidea
Sea urchins and sand dollars
A
Lack arms, tube feet attached directly to body, madreporite on aboral surface
17
Q
Chordates
A
- Subphylum Urochordata (tunicates)
- Many species have all four chordate characteristics in mobile larval form
- Sessile as adult
18
Q
Chordates
A
- Subphylum Cephalochordata
- All chordata characteristics are retained as adult
- paedomorphis
- Lancelet or Amphioxus
- Cephalochardate- similar to juvenile tunicate
19
Q
Hox
A
Genes that control the body plan of an embryo along the cranio (head-tail) axis are conserved
