Phyla/Classes
, PHYLA
Porifera
Metazoa (animal)
- Aquatic
- Sessile (can’t self-locomote)
o Flagella to create a water current within the spongocoel
o Collar to catch food within the spongocoel
- Multicellular, asymmetric body plan, diploblastic
- Aggregation of cell types, only little integration of functions (no tissues)
o Amoebocyte Mobile cell that plays a role in defense & food uptake
o Choanocyte Cells that line the interior of sponge cells, they generate a water current
o Porocyte Tubular cells that make up the pores of the sponge
o Pinacocyte Flat cells found on the outermost layer of the sponge
- Body with pores, canals and chambers
o Spongocoel
- “Skeletal structure” of collagen, spongin and spicules
- No true tissue
- 3 different types of sponges: Asconoid type – Leucosolenia
Syconoid type – Grantia
Leuconoid type – Halichondria panacea
, Cnidaria
Metazoa (animal) Eumetazoa (with true tissue) Radiata (radially symmetrical)
- Most species are marine
o Free-living medusa (or jellyfish)
o Sessile polyp
- Radially symmetrical
- Eumetozoan, diploblastic (epidermis and gastrodermis, separated by mesoglea)
- Distinctive cell type cnidocyte
o In cnidocytes, nematocysts can be triggered to shoot a organelle that contains toxin
- Carnivorous
o Tentacles used to catch prey
- Thecata
o Disk-shaped when medusa
o Often forms colonies
Hydranth feeding polyp
Gonangium reproductive polyp
- Athecata
o Bell-shaped when medusa
- Extracellular digestion in gastrovascular cavity
, PHYLA
Porifera
Metazoa (animal)
- Aquatic
- Sessile (can’t self-locomote)
o Flagella to create a water current within the spongocoel
o Collar to catch food within the spongocoel
- Multicellular, asymmetric body plan, diploblastic
- Aggregation of cell types, only little integration of functions (no tissues)
o Amoebocyte Mobile cell that plays a role in defense & food uptake
o Choanocyte Cells that line the interior of sponge cells, they generate a water current
o Porocyte Tubular cells that make up the pores of the sponge
o Pinacocyte Flat cells found on the outermost layer of the sponge
- Body with pores, canals and chambers
o Spongocoel
- “Skeletal structure” of collagen, spongin and spicules
- No true tissue
- 3 different types of sponges: Asconoid type – Leucosolenia
Syconoid type – Grantia
Leuconoid type – Halichondria panacea
, Cnidaria
Metazoa (animal) Eumetazoa (with true tissue) Radiata (radially symmetrical)
- Most species are marine
o Free-living medusa (or jellyfish)
o Sessile polyp
- Radially symmetrical
- Eumetozoan, diploblastic (epidermis and gastrodermis, separated by mesoglea)
- Distinctive cell type cnidocyte
o In cnidocytes, nematocysts can be triggered to shoot a organelle that contains toxin
- Carnivorous
o Tentacles used to catch prey
- Thecata
o Disk-shaped when medusa
o Often forms colonies
Hydranth feeding polyp
Gonangium reproductive polyp
- Athecata
o Bell-shaped when medusa
- Extracellular digestion in gastrovascular cavity
