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Cnideria
- Cnida = "nettle"
- have cnidocytes with nematocysts
- jellies, anemones, hydros, corrals
- diploblastic
- radial symmetry
- two-way gut
- two basic body plans : polyp and medusa
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Cnideria classes
- Hydrozoa
- Scyphozoa
- Anthozoa
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Hydrozoa
- "hydra animal"
- has polyp and medusa form
- mostly marine, few freshwater
- acellular mesoglea
- gastrodermis endoderm that lacks nematocysts
- eggs/sperm eject via ectoderm
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Medusozoa
- Cnidaria Subphylum
- "medusa animal"
- has medusa bp
- includes scyphozoa and hydrozoa
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oral vs aboral
- oral - orientation/area where mouth is located
- aboral - region opposite side of the mouth
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gastrovascular cavity
- all internal space of an organism
- modified to have specialized regions
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nematocyst
- "thread capsule"
- stinging tool
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exumbrella
aboral side of medusa
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ring canal
area between the tentacular and the radial canal
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hydranth
end of hydroid with tentacles
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manubrium
- aka hypostome
- an evasion at the oral side of the medusa that contains the mouth
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gastrozooids
feeding polyp for hydroids
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polymorphism
various forms of the same species due to specialization
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strobilation
- schyphozoans
- scyphistomae asexually produce young medusae
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complete septum
septa that span the coeleteron and join the pharynx
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oral disc
wide area on top of the column containing the mouth
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Scyphozoa
- "cup animal"
- meduas and jellies
- medusa stage dominate
- gastric fillaments
- nematocysts
- thick mesoglea
- no nerve rings but with nerve net
- simple and separate polyps
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polyp
- cnidarian bd
- trunk
- tentacles
- oral end at tentacles
- can be anchoring
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mesoglea
- "middle jelly"
- mostly water and protein to keep structure
- forms hydrostatic skeleton
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cnidoctyte
- cnidarians
- sensory effector cell
- for prey capture, defence and prey immobiliation
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sub-umbrella
oral surface of a medusa
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thecate
perisarc only goes around stalk
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hydrocaulus
- Hydrozoa
- hollow cavity in the middle of a polyp
- directly connects individuals of a colony
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gonozooids
- hydrozoa
- reproductive zooid
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incomplete septum
septa only partially attached to the pharynx
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column
stalk of the polyp
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periderm
chitonous exoskeleton excreted by pedal disc and column of polyp
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aquiferous system
internal water network
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Anthozoa
- "plant animal"
- corals and anemones
- lack a medusa stage (polyps only)
- large distinct complex polyps
- have pharynx
- subdivided gvc
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medusa
- jelly form
- big bulb
- lots of tentacles
- oral end near tentacles
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radial symmetry
circular symmetry
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gastric cavity
large sac that aids in digestion and nutrient distribution
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statocycst/statolith
gravity sensor for cniderians
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perisarc
- "around coat"
- goes around stolon and stalks
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athecate
when perisarc only covers stalk
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hydrotheca
area where perisarc covers tentacles
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dactylozooids
- defence zooids in hydroids
- have nematocysts
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rhopalium
- scyphozoa
- bundles of sensory and nervous tissues on top of medusa bell
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gastric filaments
- Scyphozoa
- endoderm that bears nematoysts
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basal disk
area where anthozoa attaches to a substrate
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acontial filaments
- Anthozoa
- filaments that hang free in gastrovascular cavity
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Scyphozoa larva cycle
- Planula
- budding scyphistoma
- polyp
- ephyra
- medusa
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