Chapter 32: Intro to Animals Flashcards Preview

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Flashcards in Chapter 32: Intro to Animals Deck (15)
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1

Kingdom Animalia

  •  Unifying characteristics:
    • 1. Heterotrophs by ingestion
    • 2. Multicellular
    • 3. Lack a cell wall
    • 4. Tissue Systems - Nervous, Muscle
    • 5. Sexual - Diploid dominant

2

Early Development

3

​Body Plan

  • is a set of morphological & developmental traits
  • Features include -
    • 1. Symmetry
    • 2. Tissues
    • 3. Body cavities
    • 4. Development 

4

Symmetry

  •  Three forms
    • 1. Asymmetry
    • 2. Radial
    • 3. Bilateral

5

Tissues

  • arise from germ layers
  • Three germ layers
    • 1. Ectoderm - outer covering
    • 2. Endoderm - lining of digestive tract
    • 3. Mesoderm - muscles, organs
  • Animals can be diplo or triploblastic (most)

6

Diploblastic vs. Triploblastic

  • Diploblastic
    • Contains 2 germ layers
    • Lack Mesoderm
      • Sponges, Cnidarians
  • Triploblastic
    • Contain 3 germ layers
    • Have mesoderm
    • all bilateral animals

7

​Body Cavity

  • is a fluid filled space b/w digestive tract; body wall
  • Three types:
    • 1. Coelom - “true”
    • 2. Pseudocoelom - “false”
    • 3. Acoelom - none

8

examples of the body cavity

9

Developmental Mode

  • Can be described as
    • 1. Protostome
    • 2. Deuterostome
  • Distinguished by cleavage, coelom formation and fate of blastopore

10

History

  • Common ancestor dating to 770 mya
  • Spans four geologic eras
    • 1. Neoproterozoic
    • 2. Paleozoic
    • 3. Mesozoic
    • 4. Cenozoic

11

Ediacaran Biota

12

Cambrian Explosion

13

Animal Origins

  • closest living relatives are choanoflagellates

14

Diversification of Animals

  • All belong to a clade called Metazoa
  • Other clades:
    • Eumetazoa: have true tissue ​
    • Bilateria: bilateral symmetry, 3 germ layers

15

Clade Bilateria

  • Contain 3 major clades
    • 1. Deuterostomia - chordates… you!
    • 2. Lophotrochozoa - “crown” of cilia
    • 3. Ecdysozoa - shed exoskeleton