Phylum Cnidaria Flashcards
previous phylum name of Phylum Cnidaria
Phylum Coelenterata
Phylum Ctenophora are?
comb jellies (no stinging cells)
meaning of Coelenterata
hollow cavity
sticky cells
colloblasts
meaning of Cnidarian
stinging creature
habitat of jellyfish
mostly marine, some freshwater
habit of jellyfish
solitary or colonial
habit form of jellyfish
medusa and polyp
sessile form of jellyfish where tentacles are at the top (asexual stage)
polyp
free swimming form of jellyfish where tentacles are at the bottom (sexual stage)
medusa
body parts/ structure of a jellyfish
bell, mouth, velarium, tentacles
germ layers of a jellyfish
ectoderm (cnidocytes), endoderm (digestive cells) , mesoglea (water content)
primary organ of digestion and circulation
gastrovascular cavity (GVC) or coelenteron
specialized cells of jellyfish
nematocyst and cnidocyte
an organelle consisting of a coiled, thread-like stinger
Nematocyst
stinging cells
Cnidocyte
purpose of stinging cells
defense mechanism
respiration and excretion
simple diffusion
nervous system
nerve nets
reproduction
sexual (fertilization) and asexual (budding)
stages of growth of a Medusa
- gametes
- planula
- scyphistoma
- young strobila
- strobila
- ephyra (young medusa)
- adult medusa
secrete sperm and egg to form larva which then emerges and find a substrate to reproduce
gonads
jellyfish with thin tentacles are?
venomous
classes under Phylum Cnidaria
Cubozoa, Scyphozoa, Anthozoa, Hydrozoa
box jellyfish
Class Cubozoa
true jellyfish in medusa form
Class Scyphozoa
corals and sea anemones
have a symbiotic relationship with algae
Class Anthozoa
medusoid (“fake” medusa) polyp
Class Hydrozoa
