Lab Exam 3 Flashcards
Domain Eukarya
4 Kingdoms: Protista, Plantae, Fungi, Animalia
Kingdom Animalia
- Phylum Porifera – sponges 2. Phylum Cnidaria – jellyfish, hydra, sea anemones, corals a) Class Hydrozoa b) Class Scyphozoa c) Class Anthozoa
Phylum Porifera (osculum and ostia)
osculum and ostia
Relate flow of water
Water enters through the ostia, passes through the spongocoel, and exits through the osteum.
Choanocytes line the inside of the sponge and surround flagella which together pass the water through the spongocoel
Silica, Spongin sponges
Silica are long white ones and all the brown ones that look like loofahs are spongin
Cross-Section of Sponge: know following structures and know their functions: osculum, spongocoel, ostia.
Phylum Cnidaria (Anatomy)
Cnidaria: Polyp vs. Medussa forms
Polyps are stationary (tethered to a stem); medussa is the cap and free-floating (like a jellyfish)
Both are 2n; both have tentacles
Cnidaria Tentacles
used for movement, feeding and protection against by predators due to their stinging cells
Describe live Hyrdra (Class Hydrazoa)
Hydra can move by floating or by using its tentacles to pop/cartwheel
Cnidaria: Hydra Structures and Function
gastrovascular cavity: water flows in through the mouth into the cavity and digestion occurs
tentacles: locomotion and stinging
mouth: water goes in
cnidocytes: Sting (the bumps on the tentacles)
Obelia Life Cycle
Feeding vs. Reproductive Polyps
Obelia: Free-Living Medusa
Class Sychophoza
True Jellyfish
Class Anthozoa
corals & sea anemones
Know structures
Composition: corals form a hard skeleton made of calcium carbonate
Common Features of Cnidaria, Sponges
All eukaryotic,
All Multicellular
All Chemo-heterotrophic
Sexual Reproduction (except polyps which are asexual)
Mostly exhibit body symmetry (radial/bilateral)
Some but not all have “true tissue”
locomotion from cilia (larvae) and tentacles
Filter Feeders
Many armed with stinging cells and tentacles allow for locomotion as well as some are able to do jet repulsion
