Ch. 33 Flashcards
What are animals that lack a backbone?
Invertebrates; account for more than 95% of known animal species
Filter feeder,
Mass feeder,
Deposit feeder,
Fluid feeder
are examples of what?
Feeding strategies
Subkingdom Parazoa - Phylum Porifera (what animal & four characteristics)
- Sponges
- Lack tissues
- Multicellular with several types of cells
- No apparent symmetry
- Adults sessile (don’t move), larvae free-swimming
Sponges are ______, capturing food particles suspended in the water that passes through their body
filter feeders
In sponges water is drawn through pores ____ a cavity called the _________ and ____ through an opening called the ________.
into, spongocoel, out, osculum
What is an opening into a vessel or body cavity?
ostium
_______ - main opening at the aboral end
Osculum
The cells that create the opening in the sponge are called?
porocytes
Coelom means?
body cavity
Osculum means
mouth
What are the cell types of sponges?
Choanocytes and Amoebocytes
What has flagellated collar cells,
generates a water current through the sponge
ingest suspended food
choanocytes
What type of cells are totipotent found in the mesohyl that play roles in digestion
manufacture of skeletal fibers - (absorb food from this cell, digest it, and carry it to other cells)
amoebocytes
Choano means
funnel
Spicules means
structural support; meohyle
Sponges reproduce sexually, most _________ produce _____ and _______
hermaphrodites, egg, sperm
In sponges where do the gametes come from?
amoebocytes or choanocytes
Where does fertilization happen in a sponge?
In the mesohyle
When sponges produce asexually it is?
Fragmentation, small fragment or bud may deetach and form a new sponge
Most sponges exhibit ________ ___________, where they function first as one sex and then as the other?
sequential hermaphroditism
Subkingdom Eumetazoa, Phylum Cnidaria has what kind of symmetry and how many germ layers?
Radial symmetry and are diploblastic (two germ layers which are ectoderm and endoderm)
What is the gastrovascular cavity in phylum cnidaria?
Extracellular digestion; incomplete gut
How many openings function as mouth and anus in gastrovascular cavity?
A single opening
In phylum cnidaria how are true nerve cells arranged?
In a nerve net
