Cnidarians and Ctenophores

Card Set Information

Author:
Siobhan
ID:
120408
Filename:
Cnidarians and Ctenophores
Updated:
2011-12-04 19:14:07
Tags:
Cnidarians Ctenophores
Folders:

Description:
Cnidarians and Ctenophores
Show Answers:

Home > Flashcards > Print Preview

The flashcards below were created by user Siobhan on FreezingBlue Flashcards. What would you like to do?



  1. Characteristics of Cnidaria and Ctenophora
    • Radially symmetrical
    • Tissue level organization
    • Diploblastic
    • no mesoderm

  2. Characteristics
    of
    Cnidarians

    (jellyfish,
    hydroids, anemones, corals)
    • Stinging cells- nematocysts
    • Sessile or drifting/slow moving
    • Incomplete gut- gastrovascular cavity
    • Tentacles
    • Nerve net
    • All reproduce sexually
    • Colonial or polyp forms also reproduce asexually by budding
    • aquatic

  3. Cool
    Things about Cnidarians

    • Some animals eat or “wear” cnidarians and
    • use the nematocysts for their own defense
    • Some jellyfish are edible
    • Corals and jellyfish are important as
    • environmental indicators
    • Not all nematocysts inflict a painful
    • sting on humans
    • Jellyfish stings can be treated with meat
    • tenderizer

  4. Cnidarian
    Form and Function

    • Two morphologies
    • Polyp
    • (sessile) like corals or hydra
    • Medusa
    • (planktonic or swimming form)
    • like jellyfish
    • Solitary or Colonial
    • ex.
    • jellyfish vs
    • hydroids

  5. Cnidocytes
    • Cnidocytes are the stinging
    • cells
    • Cnidocil
    • Sensory
    • “hair-like” trigger
    • Nematocysts can contain toxins or secrete
    • a glue-like substance
    • Filament is “injected” into prey
    • Nematocysts can only fire once

  6. Corals
    • Coral animals only represent thin surface
    • of reef
    • Gastrovascular cavities
    • of individual polys connected
    • Base of polyp secretes CaCO3
    • Polyps can
    • retract into “skeleton”
    • Some have painful nematocysts (fire
    • coral)
  7. Ctenophores
    or “comb jellies”

    • All marine
    • Do not have nematocysts
    • Some
    • utilize the nematocysts of prey
    • Some bioluminescent
    • Poor swimmers, most planktonic
    • Swim with cilia
    • Nerve net
    • Tentacles make to trap prey
    • Most eat
    • zooplankton

What would you like to do?

Home > Flashcards > Print Preview