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How are amphiblastula larva formed?
they are formed from a round thing of cells the cells grow some flagella and then the round thing of cells inverst so that the flagella face outwards instead of inwards
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sponges are looked at the level of cell what level do we consider cnidarians?
the tissue grade
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What significant feature on earth are cnidarians responsible for
the construction of coral reefs
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About 9,000-10,000 extant species of _______, ________, __________ and their relatives are described.
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define dipoblasty
Diploblasty is a condition of the ovum in which there are two primary germ layers: the ectoderm and endoderm. Diploblastic organisms are organisms which develop from such an
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what do the ectoderm and endoderm become in the adult
epidermus and gastrodermis
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What are these two layers epidermus and gastrodermis seperated by
these two layers are seperated by an ectodermally derived acellular mesoglea
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what kind of symetry do cnidarians show
radial symetry
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define oral-aboral
and is termed the oral, or anterior, end, and the other of which, called the aboral, or posterior, end, forms the rear end of the animal and may bear the anus. The main axis is hence termed the oral-aboral, or anteroposterior, axis. Except in animals having an odd number of parts arranged in circular fashion (as in the five-armed
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Possess unique stinging or adhesive organelles called _______; each cnidais produced in a cell, the ________. The most common cnidaeare ________.
- cnidae
- cnidocyte
- nematocysts
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What does the gastrovascular cavity serve as
Both the mouth and anus
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A diffuse _______ system structured as simple nerve nets, comprised of _______ and largely non-polar ______.
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What do cnidarians show think AoG but the fancy term for it
Metagensis -The phenomenon in which one generation of certain plants and animals reproduces asexually, followed by a sexually reproducing generation. Also known as alternation of generations.
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Typically have ________ larvae (ciliated, motile, gastrula larvae).
planula
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Fig 6.4 and 6.5 described
- 6.4 is a of a hydra which looks lke a bowling pin with tentacles at the top
- 6.5 is a medussa which looks like a jellyfish with extremly stubby stinger tentacles
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SUBKINGDOM –EUMETAZOA PHYLUM –CNIDARIA
SUBPHYLUM –MEDUSOZOA
Class-Scyphozoa, Cubozoa, Hydrozoa,
SUBPHYLUM – Class Anthozoa Class Myxozoa(unranked)
Just saying
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What is our approach to cnideria?
discusss on a class-by-class basis
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Are there any colonial species in hydrozoa?
Yes many colonial species in hydrozoa
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Oblea (species) just saying
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Obeliahas both well developed _____ and _____ phases.
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Polyps are _______ with _________ polymorphism
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Polyps grow as bushy (________) colonies on marine algae and drift wood
thecate
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Colonies consist of root-like __________ and stem-like ____________.
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Obeliasp. hydrocaulus Made up of living tissue (_______ and ______ ) that secrete a chitinous ________ (hydrotheca, gonothecaand perisarc)
- polyps
- coenosarc
- exoskeleton
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Body hollow cylinder – ___________ _________
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In hydrozoans the gastrovasculardoes not extend into tentacles but ______________ do
gastrodermal cells
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What is the Outer tissue layer called
Epidermis
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Middle jelly-like layer –
–mesoglea
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Inner tissue layer is the ______________
–gastrodermis
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Refering to Hydraactinia a colony that looks like plant with a stem and bulbs at the top. They are known as what (related to body or lack of)
Athecate colony meaning no-body
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What is a gonozooid
Gonozooid - A sexual zooid, or medusoid bud of a hydroid; a gonophore.
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What is a gastrozooid
Gastrozooid A nutritive polyp of colonial coelenterates, characterized by having tentacles and a mouth.
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What are dactoylzooids
- Some colonies possess
- dactylozooids, tentacleless polyps heavily armed with nematocysts that
- seem primarily concerned with defense.
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Millepora, a hydrocoral just saying
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What are millepora also known as?
Fire corals
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__________ secretes a CaCO3(aragonite) skeleton
Coenosarc
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What two -zooids does millepora share with hydractinia in common? doesnt acutally "share" but ahs the same thing
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What does obelia medusa "look" like?
looks like a shallow umbrella fringed with tentcles
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Convex outer surface – ____________
exumbrella
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Concave inner surface – ______________
subumbrella
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Define vellum in relation to obelia
Velum - the circular membrane around the cap of a sea jelly or medusa, which helps with propulsion
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Obeliahas a craspedotemedusa because of the _______
Velum
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Mouth opens at end of ____________
manubrium
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Manubriumcontains the _____________
gastrovascular cavity
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The cavity extends through the umbrella as ___________ that are connected together at the ___________ as the ring canal.
- four radial canals
- margin of the bell
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Four gonads lie in the ___________ epidermis beneath the ________.
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Where does the medusa come from?
Froma hydroid colony (the thing with a gastrodermis, the medusa release fertilized eggs which become the planula which becoems a young hydroid colony which becomes a mature hydroid colony which becomes a mature hydroid colony
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