Bilateria + Ecdysozoa Flashcards
(12 cards)
1
Q
What are the 3 layers of cells in Bilateria
A
- ectoderm = epidermis + nerves
- endoderm = digestive tract
- mesoderm = muscle + connective tissue
2
Q
What does protostomia mean in terms of mouth position
A
Mouth first - blastopore becomes the mouth
3
Q
What does Deuterostomia mean in terms of mouth position
A
Mouth second - blastopore becomes anus
4
Q
What 4 groups come under Bilateria
A
- Deuterostomia
- protostomia
- Ecdysozoa
- spiralia
5
Q
What 2 groups come under protostomes
A
Ecdysozoa
Spiralia
6
Q
What organisms come under Ecdysozoa
A
Arthropods + allies
Nematodes + allies
7
Q
What organisms come under spiralia
A
Rotifers + allies, arrow worms
Flatworms + allies, molluscs, annelids +allies
8
Q
Describe features of Ecdysozoa
A
- grow by ecdysis (moulting exoskeleton)
- lack locomotory cilia
- amoeboid sperm
- ring of spines around mouth
9
Q
What are spiralia named after
A
The spiral cleavage of the embryo
10
Q
Describe features of a deuterostomes
A
- radial cleavage
- blastopore becomes anus
- entercoelom
- gill slits in pharynx
11
Q
What falls under panarthropoda
A
Onychophora
Tardigrade
Anthropoda
12
Q
Describe the general features of panarthropoda
A
- legs + claws
- ventral nervous system
- segmented body
- tactopoda
