Phyla: Cnidarians + Ctenophora Flashcards

Cnidarians
Terms Definitions
What organisms are included in the phylum Cnideria
Hydras, True Jellyfish, Sea Anemonies and Coral
What level of organisation are the Cniderians
Tissue level
Are Cniderians Diploblastic or Triploblastic
Diploblastic
Cniderians have a (blank) type of gut
Two-way
what type of symmetry do cniderieans have
radial
what are the 3 layers that cnidarians arre composed of
Epidermis, Mesoglea, and Gastrodermis
What is Mesoglea
non living gel-like substance
the stinging organelles or cells are called
Nematocysts
nameocysts are produced by
Cnidocytes
the covering atop the nematocysts is called the
Operculum
The Operculum pops off when
the Cnidocil is touched
the Cnidocil is
a trigger on the Nematocysts
what is the main difference between the polyp for and medusae form of Cnidarians
polyps are not motile, medusae swim
how is the nervous sytem organized in cnidarians
it is a nerve net and it has no central nervous system
what occurs in the gastrovascular cavity
circulation gas exchange and excretion
What are the 4 Classes of Cnidarians
Hydrozoa, Scyphazoa, Anthezoans, Cubozoa
the Hydrazoans include
Hydras and Hydroid Jellyfish
what is another name for velum
Crespidote
what are the true Jellyfish
the Scyphazoa
in the Scyphazoans which stage is more dominant
the Medusa stage
The Medusa in Scyphazoa lack this
Velum (acrespidote)
Hydrazoans unlike Scyphazoa has big one of this
Manubrium
Explian life cycle of medusa
Diocious Medusa, gamete production, fertilization to zygote, ciliated larva (planula), planula settles and forms Scyphastoma (young polyp), matures to Strobila, and Medusae bud-off (ephyrae)
Anthezoans are known to be
Sessile. not much movement
Anthezoans are only in what form
Polyp form
Anthezoans include which animals
Sea Anemonies and Corals
Hexacoralea, and Octocoralea have how many body parts respectively
6, and 8
zooantheria and alcynaria are other names for
hexacoralea and octocoralea
sea pansies are part of the
octocorals
Cubozoans are the
Box Jellys
Another name for the Box Jelly Cubozoans is
Sea Wasps
What two characteristics set the cubozoans apart
Extremely Toxic Sting, and Box Shape
The Comb Jellys are also the
Ctenophora Phylum
Ctenophoras are at this level of organization
tissue level
what is between the diploblastic layers epidermis and gastrodermis
collenchyme
the Ctenophores are special in that their gut is
a One Way Gut!
What type of Symmetry do the Ctenophores exhibit
Radial
Ctenophores have an adhesive structures called
Colloblasts
The Ctenophores nervous system is the form of
Complex Nerve Net
like the Cnidarians the Ctenophorans have what going on in the GVC
circulation and gas exchange and excretion
they are called comb jellys because
they have eight combrows
the combrows in the ctenophores are comprised of
cilia
the Ctenophores have no
Sessile Stage (polyp stage)
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