Flashcards in Sponges and Cnidaria and Cnetophora Deck (48)
What Phylum are sponges a part of?
Porifera meaning "pore bearers"
Do sponges have true tissues?
No. They have no nervous system or muscles. They have a loose aggregation of cells.
What environments do sponges live in?
Mostly marine and all aquatic
How do Sponges feed?
Filter feed through many pores and canals
What cells pump water in sponges?
Collar Cells (Choanocytes) pump water
What is the sponge made of?
Skeleton made of spicules and spongin
Do sponges move?
No. They are sessile but have motile larvae.
How has the sponge body plan evolved over time?
To enhance filtration efficiency with a high internal surface area with lots of canals and chambers.
What is the name of the opening where water flows in through on the sponge?
What feature defines the Phylum Porifera?
Collar Cells (Choanocytes)
-They pump water and allow for particle feeding
How do Choanocytes work?
Flagellum in choanocyte beats back and forth causing pressure gradient
-water is sucked in through collar of microvilli
-particles are caught and eaten as they pass through the collar
What are Archaeocytes?
Ameoboid cells that live in the mesohyl
-They ingest, digest food caught by choanocyte collars (intracellular digestion)
-They are totipotent (can change into any sponge cell)
What is the mesohyl in the sponge?
Gelatinous extracellular matrix made of jelly like collagen
What is the major structural protein in Metazoa (including sponges)?
How do sponges reproduce?
-Releasing sperm and creating eggs (hermaphroditic)
-Budding and/or Fragmentation
What else live in the cells or mesohyl of the sponge?
Symbiotic microbes that help produce unique organic compounds
What can the unique organic compounds produced by sponges/microbes be used for?
new sources of medicines
How do sponges accomplish Excretion/Respiration?
Do Sponges have germ layers, symmetry or are they protostomes or Deuterostomes?
No Germ Layers
Not a protostome or deuterostome
What is the group Radiata and what Phyla are included in this group?
Radiata are the two phyla with radial symmetry
-Includes Phyla Cnidaria and Cnetophora
What kinds of tissues do Radiata have?
2 Germ Layers
-Endoderm and Ectoderm
No Mesoderm or organ systems
Do Radiata have a stomach?
No. They have a Gastrovascular Cavity (gut)
What environments do Radiata live?
Mostly Marine all aquatic. Some freshwater.
What species are included in Phylum Cnidaria?
Jellyfish, Anemones, and Corals
What is the defining characteristic of Phylum Cnidaria?
Presence of Cnidocytes
Do Phylum Cnidaria species move?
Some are Sessile (Corals) and some are Moblie (Jellyfish)
-The ones that are mobile don't swim, they drift
Are Cnidaria diploblastic or triploblastic?
Diploblastic b/c they have 2 germ layers
How do Cnidaria reproduce?
Sexually and Asexually
What are the two bodyplans of Cnidaria?
Polyps and Medusae