Quiz 9 Flashcards
How do we classify animals
- Type of body symmetry
- Different tissue types
- Body cavity (Coelom)
- Patterns of embryonic development
Types of Symmetry
Asymmetrical - without symmetry
Radial- Parts radiate from center
Bilateral- mirror image
Tissues
Parazoa
-Porifera (pore bearer sponges) Eumetazoa
Parazoa tissue
no specialized tissues or organs
Eutmetazoa
more than one type of tissue and organs
Germ Tissue Layers developed in Embryos
Endoderm
Mesoderm
Ectoderm
Endoderm
(yellow) layer of germ tissue that develops in embryo
innermost layers
becomes gut, liver, lungs
Mesoderm
(blue) layer of germ tissue that develops in embryos
middle layer
becomes skeleton, heart, kidney, muscle, blood
Ectoderm
(red) layer of germ tissue that develops in embryos
outermost layer
becomes skin nervous system
Classification based on Germ layers
Diploblastic
Triploblastic
Diploblastic
two layers
endoderm and ectoderm ONLY
Triploblastic
three layers, endoderm, mesoderm and ectoderm
Three types of Body Cavity (Coeloms)
Acoelomate
Pseudocoelomate
Coelomate
Acoelomate
-no true body cavity
Pseudocoelomate
False body cavity not completely lined with mesoderm
Coelomate
body cavity completely lined with mesodermal tissue