Chapter 32: Intro to Animals Flashcards
1
Q
Kingdom Animalia
A
- Unifying characteristics:
- Heterotrophs by ingestion
- Multicellular
- Lack a cell wall
- Tissue Systems - Nervous, Muscle
- Sexual - Diploid dominant
2
Q
Early Development
A
3
Q
Body Plan
A
- is a set of morphological & developmental traits
- Features include -
- Symmetry
- Tissues
- Body cavities
- Development
4
Q
Symmetry
A
- Three forms
- Asymmetry
- Radial
- Bilateral
5
Q
Tissues
A
- arise from germ layers
- Three germ layers
- Ectoderm - outer covering
- Endoderm - lining of digestive tract
- Mesoderm - muscles, organs
- Animals can be diplo or triploblastic (most)
6
Q
Diploblastic vs. Triploblastic
A
-
Diploblastic
- Contains 2 germ layers
- Lack Mesoderm
- Sponges, Cnidarians
-
Triploblastic
- Contain 3 germ layers
- Have mesoderm
- all bilateral animals
7
Q
Body Cavity
A
- is a fluid filled space b/w digestive tract; body wall
- Three types:
- Coelom - “true”
- Pseudocoelom - “false”
- Acoelom - none
8
Q
examples of the body cavity
A
9
Q
Developmental Mode
A
- Can be described as
- Protostome
- Deuterostome
- Distinguished by cleavage, coelom formation and fate of blastopore
10
Q
History
A
- Common ancestor dating to 770 mya
- Spans four geologic eras
- Neoproterozoic
- Paleozoic
- Mesozoic
- Cenozoic
11
Q
Ediacaran Biota
A
12
Q
Cambrian Explosion
A
13
Q
Animal Origins
A
- closest living relatives are choanoflagellates
14
Q
Diversification of Animals
A
- All belong to a clade called Metazoa
- Other clades:
- Eumetazoa: have true tissue
- Bilateria: bilateral symmetry, 3 germ layers
15
Q
Clade Bilateria
A
- Contain 3 major clades
- Deuterostomia - chordates… you!
- Lophotrochozoa - “crown” of cilia
- Ecdysozoa - shed exoskeleton
