Simple animals Flashcards
What are three defining traits for Animals?
Multicellular, heterotrophs, and move under their own power
how many Porifera are there, and what are they?
7,000 sponges
How many Cnidaria are there?
10,000 species, they include jellyfish, corals, anemones, hydroids, and seafans
How many Platyhelminthes are there?
20,000 species and they are flatworms
How many Annelidia are there?
16,500 segmented worms
How many Mollusca are there?
94,000 includes Molluscs like clams, snails, and octopuses
How many Ectoprocta are there?
4,500 species
How many Nematodas are there?
25,000 different roundworm species
How many different species of arthropods are there?
1,100,000 species of arthropods
How many Echinodermata are there?
7000 Echinoderms, they are deuterostomes and include sea stars, sea urchins, and sea cucumbers
How many Chordata are there?
50,000 lancelets, mammals ect.
What are the four features that define an animal’s body plan?
- Number of embryonic tissue layers
- type of body symmetry and degree of cephalization
- presence of absence of a fluid-filled body cavity
- how earliest events of embryonic development proceed
What are diploblasts?
embryos have two types of tissue
- ectoderm (outside skin)
- endoderm (inside skin)
What are Triploblasts?
Embryos have three types of tissues
- ectoderm (outside skin)
- endoderm (inside skin)
- mesodurn (middle skin)
What did the development of bilateral symmetry allow for?
the development of cephalization
