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Cnidaria and Ctenophora
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Biology
10/09/2012

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Term
aboral
Definition
opposite to or away from the mouth.
Term
anthozoa
Definition
a class within the phylum Cnidaria. Unlike other cnidarians, anthozoans do not have a medusa stage in their development. Instead, they release sperm and eggs that form a planula, which attaches to some substrate on which the cnidarian grows.
Term
basal disc
Definition
The expanded basal portion of the stalk of certain sessile organisms, used for attachment to the substrate.
Term
budding
Definition
a prominence that develops into a new individual, sometimes permanently attached to the parent and sometimes becoming detached; gemma.
Term
cnidaria
Definition
an alternative name for the invertebrate phylum Coelenterata, giving emphasis to the stinging structures as characteristic of the phylum
Term
cnidocil
Definition
a hairlike sensory process projecting from the surface of a cnidoblast, believed to trigger the discharge of the nematocyst.
Term
cnidocyte
Definition
the explosive cell containing one giant secretory organelle or cnidae that define the phylum Cnidaria (corals, sea anemones, hydrae, jellyfish, etc.).
Term
collenchyme
Definition
a gelatinous layer of cells in the body wall of some coelenterates and ctenophores
Term
comb plates
Definition
a locomotor organ consisting of a row of strong cilia whose bases are fused
Term
comb rows
Definition
commonly known as comb jellies) are a phylum of animals that live in marine waters worldwide.
Term
ctenophora
Definition
the phylum comprising the comb jellies.
Term
cubozoa
Definition
Box jellyfish (class Cubozoa) are cnidarian invertebrates distinguished by their cube-shaped medusae.
Term
epitheliomuscular
Definition
of or pertaining to an epithelial cell of a coelenterate that contains contractile fibrils and acts as a muscle.
Term
gastrovascular cavity
Definition
functions in both digestion and the distribution of nutrients and particles to all parts of the body. Organisms belonging to two major phyla, the Coelenterata and the Platyhelminthes, possess gastrovascular cavities.
Term
gonopore
Definition
an opening through which eggs or sperm are released, especially in invertebrates.
Term
hydrostatic skeleton
Definition
a structure found in many cold-blooded organisms and soft-bodied animals consisting of a fluid-filled cavity, the coelom, surrounded by muscles.
Term
hydrozoa
Definition
coelenterates typically having alternation of generations; hydroid phase is usually colonial giving rise to the medusoid phase by budding: hydras and jellyfishes
Term
hypostome
Definition
any of several parts or organs of the mouth, as the labrum of a crustacean.
Term
interstitial cells
Definition
a segment, bone, cell, etc., resembling a handle.
Term
medusa
Definition
a saucer-shaped or dome-shaped, free-swimming jellyfish or hydra.
Term
nematocyst
Definition
an organ in coelenterates consisting of a minute capsule containing an ejectable thread that causes a sting.
Term
neuromuscular
Definition
pertaining to or affecting both nerves and muscles.
Term
oral
Definition
of, pertaining to, or involving the mouth
Term
oral arms
Definition
located around the mouth and hold the stinging cells, or cnidocysts, which are used to inject potential prey (or potential predators) with venom.
Term
polyp
Definition
a sedentary type of animal form characterized by a more or less fixed base, columnar body, and free end with mouth and tentacles, especially as applied to coelenterates.
Term
scyphozoa
Definition
coelenterates in which the polyp stage is absent or at least inconspicuous: jellyfishes
Term
strobilation
Definition
asexual reproduction by division into segments, as in tapeworms and jellyfishes
Term
tentacles
Definition
any of various slender, flexible processes or appendages in animals, especially invertebrates, that serve as organs of touch, prehension, etc.; feeler.
Term
zooxanthellae
Definition
Most reef-building corals contain photosynthetic algae, called zooxanthellae, that live in their tissues.