Cnidaria Flashcards
what are cnidaria?
sea anemone, jellies, hydra
basic features?
radial symmetry medusa and polyp diploblastic body - ecto/endo tentacles around mouth nematocycts gastrovascular cavity with singular opening - mouth/anus nerve net - nervous system not centralised planula larva no coelomic cavity
ecology?
aquatic - marine habitats
sessile
free floating/swimming
predators but also predated
ecosystem impacts?
diverse habitats - nurseries and refugees, fisheries, tourism
coastal protection
jelly bloom - damaging to fisheries - harms tourism
coral bleeching - great barrier reef
what is the symmetry?
radial
moon jellies - tetramerous
function of nematocysts?
touch sensitive hair like projection
contains a harpoon which fires like a buller
thread keeps it contained
function of the nerve net?
not centralised synapses release neurotransmitters from both sides lack myelin sheaths can have concentrations exhibit regionalisation and coordination
features of hydrozoa?
portugese man o war - tentacles all individual polyps some colonial medusa phase for reproduction firecorals - large calcareous skeleton
features of cubozoa?
box jelly/ sea wasp
bell almost square
some have eyes
features of staurozoa?
mix between jelly and polyp
features of scyphozoa?
lions mane
radial canals
sense organs
grow from planula to medusa
features of anthozoa?
sea anemone/coral
biradial symmetry
