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37 Cards in this Set
- Front
- Back
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Class Hydrozoa |
colonial hydroids and small jellyfish O. Hydroida O. Siphonophora O. Chondrophora |
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Class Anthozoa |
anemones, corals and sea pens, no medusa stage Subclass Hexacorallia -Order Actiniaria- anemones -Order Scleractinia- corals Subclass Octocorallia- soft corals, sea pens |
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Class Scyphozoa |
Large medusa phase, small polyp phase -asexually reproduce with strobilation of scyphistoma |
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Class Cubozoa |
Box jellies, sea wasps -no strobilation of scyphistoma |
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cnidocyte |
cell containing the nematocyst, usually touch- or chemosensitive |
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nematocyst |
capsule inside cnidocyte containing a barb on a coiled thread that can be quickly ejected at prey or threats |
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epidermis |
external tissue composed of a sheet of cells that has an apical side and a basal side as well as intracellular junctions |
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mesoglea |
jelly-like collagen mixture that composes body of cnidarians |
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gastrodermis |
tissue layer specialized for absorbing nutrients from food |
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polymorphic hydroid |
a type of colonial hydroid that has differentiation between gastrozooids and gonozooids |
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zooid |
tentacular part of a colonial hydroid |
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gastrozooid |
zooid specialized for feeding |
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gonozooid |
zooid that buds medusae asexually |
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perisarc |
outer covering made of chitin of the base of a zooid on colonial hydroids |
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hydrotheca |
chitinous collar slightly extending up from the perisarc |
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Order Hydroida |
life cycle dominated by polyp form, colonial, benthic |
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Order Siphonophora |
colonial, pelagic polyp |
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Order Chondrophora |
colonial, pelagic polyp |
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manubrium |
stalk in the center of a medusa where the oral arms attach that leads to the mouth |
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siphonoglyph |
ciliated grooves running from the mouth to the inside of the pharynx in anemones |
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myoepithelial cells |
cells that act as muscle but are derived from epidermis |
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hydrostatic skeleton |
internal support system made of noncompressible fluid in tubes |
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zooxanthellae |
modified dinoflagellates that are symbiotic with some anemones and coral |
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acontia |
threadlike tentacles ejected from the base of an anemone for feeding and defense |
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corallites |
cups on the surface of scleractinian corals |
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hermatypic coral |
reef-building corals |
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gastric pouches |
pouches in scyphozoans where extracellular digestion takes place |
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ring canal |
canal running around perimeter of medusa's bell, used for distributing nutrition |
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radial canals |
16 canals extending from the mouth to the ring canal |
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mesoglea |
jelly-like chitinous mass between epidermis and gastrodermis |
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marginal tentacles |
tentacles on margin of the bell that bear cnidocytes |
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rhopalia |
sensory structures in scyphozoans and cubozoans |
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statoliths |
crystalline ball precipitated by scyphozoans and cubozoans to maintain orientation relative to gravity |
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planula larva |
larva of scyphozoans and cubozoans |
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scyphistoma |
polyp stage of scyphozoan and cubozoan life cycle |
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strobilation |
process of dividing scyphistoma into multiple tiny medusae, only occurs in Scyphozoa |
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ephyra |
immature medusa produced by strobilation |
