Lab 4 - Porifera and Cnidaria Flashcards
What organisms are in the phylum porifera?
sponges
What level of organization are porifera?
cellular
How many germ layers do porifera have?
none
What kind of body cavity do porifera have?
Acoelom
What type of symmetry do porifera have?
asymmetry
How do porifera get food?
filter feeding - phagocytosis
What kind of support system do porifera have?
no formal support system
Porifera - locomotion
sessile
What kind of circulation do porifera have?
none
What kind of sensory structures do porifera have?
none
How do porifera excrete?
diffusion
How do porifera reproduce?
sexual and asexual
What are the classes of porifera?
hexactinellida, demospongiae, and calcarea
Osculum
large opening on top where water exits the sponge
Ostia
pores where water enters the sponge
Spongocoel
internal cavity of the sponge
Choanocytes
flagellated cells that filter food from the water coming into the sponge
Amoebocytes
interior of the sponge - aid in digestion, secretes spicules, and aids in reproduction
Pinacytes
outer surface - maintain structure and size
What are the three types of sponges?
Asconoid, sysonoid, and leuconid
Asconoid
small and tube shaped
Syconoid
tube-like with a complex canal system
Leuconoid
largest and most complicated
Are porifera monoecious or dioecious ?
monoecious
What is the difference between monoecious and dioecious?
mono - one house (has both eggs and sperm)
dio - two houses (has either eggs or sperm
What organisms are in phylum cnidaria?
coral, jellyfish, and hydra
What level of organization are cnidaria?
tissue
How many germ layers do cnidaria have?
2 - diploblastic
What kind of body cavity do cnidaria have?
Acoelom
What kind of symmetry do cnidaria have?
radial
Cnidaria - digestion
gastrovascular cavity
What kind of support do cnidaria have?
hydrostatic skeleton
Cnidaria - locomotion
simple muscle contraction
What kind of circulation do cnidaria have?
none
What kind of sensory structures do cnidaria have?
simple nerve net
How do cnidaria excrete?
diffusion
How do cnidaria reproduce?
sexual or asexual
Where are cnidaria found?
aquatic
What are the classes of cnidaria?
Hydrozoa, cubozoa, scyphozoa, staurozoa, anthozoa
What are the two body forms of cnidaria?
polyp (anthozoa, hydrozoa) and medusa (scyphozoa)
Hydrozoa
hydra, fire corals
Are hydrozoa polyp or medusa dominant?
polyp
Scyphozoa
true jellyfish
Are syphozoa polyp or medusa dominant?
medusa
Anthozoa
corals, anemones
Are anthozoa polyp or medusa dominant?
they only have polyp stages
Cnidaria - mesoglea
noncellular, gelatin layer
Epidermis
outer germ layer with cnidocytes
Gastrodermis
inner cell lining of the gastrovascular cavity
How do cnidaria protect themselves?
with nematocysts within cnidocytes
Nematocysts
specialized stinging cells
cnidocytes
hold nematocysts
Are cnidaria monoecious or dioecious?
both
Where are the gonads formed in cnidaria?
gastrodermis
Cnidaria -What is the hair-like trigger for the nematocysts?
cnidocil
Planula
free swimming larvae
How does a planula polyp become a medusa?
By strobilation
How does water flow through porifera?
Through the ostia, out through the spongocoel, then out through the osculum