17 Aug Question: 1. Within The Metazoan Group Are Several Branches: PARAZOA: Include Animals With Very Basal Structure. These Animals (belonging To Phyla Porifera And Placozoa)are Made Up Of Only A Few Types Of Cells, And Do Not Have True Tissues. MESOZOA: Include A Single Phylum (mesozoa) Of Minute, Parasitic, Marine Animals. Structure Involves A Single, Outer …
1. Within the metazoan group are several branches:
- PARAZOA: include animals with very basal structure. These animals (belonging to phyla Porifera and Placozoa)are
made up of only a few types of cells, and do not have true tissues.
- MESOZOA: include a single phylum (mesozoa) of minute, parasitic, marine animals. Structure involves a single, outer
layer of cells and an inner, reproductive layer of cells.
- EUMETAZOA: Includes the remaining animal phyla, all having true tissues.
.
Draw a basic phylogeny of choanoflagellates, porifera and cnidaria. Map the following features on the tree:
- Metazoa
- Parazoa
- Eumetazoa
- Radial symmetry
2. Why might it be easier to describe the directionality of bilaterally symmetrical animals?
3. There are many worm phyla, though we will only look at three this quarter. How can you tell these three phyla apart? What basic feature(s) differentiate these worm phyla?
PLATYHELMINTHES
NEMATODA: ANNELIDA:
4. The Mollusca are an incredibly diverse phylum. Name some (common name) examples of diverse molluscans:
What three features do all these mollusca have in common, no matter how diverse?
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