Term
|
Definition
Phylum with true tissues but no specialized organs
Name derived from the unique stinging cells called cnidocytes present on the body and tentacles of the members of this group |
|
|
Term
|
Definition
arranged into two tissue layers aka diploblastic arrangement
tissue layers consist of an outer epidermis and inner gastrodermis
Between those layers, is an inert gelatinous layer known as mesoglea
The gastreodermis lines the central digestive cavity aka gastrovascular cavity which has only one opening, the mouth, and is used both to ingest food and expel undigested waste |
|
|
Term
| cnidarians have what symmetry? |
|
Definition
|
|
Term
|
Definition
| connects the uniformly distributed sensory cells and motor neurons to provide for a limited number of coordinated movements and behaviors |
|
|
Term
|
Definition
| form represented by a cylindrical organism that remains attached to the substance by a short stalk and has a mouth that faces away from the substrate (upward) |
|
|
Term
|
Definition
form more circular, umbrella-shaped with a mouthon the underside
generally free floating w/ tentacles that hang downward |
|
|
Term
|
Definition
| viscocity of gelatinous mesoglea and regulation of fluid in the gastrovascular cavity |
|
|
Term
|
Definition
Hydrozoa
Scyphozoa
Anthozoa |
|
|
Term
|
Definition
Hydra
Obelia
Portuguese man-of-war
alternation of polyp and medusa stages in most species, medusa has velum, mostly marine with a few freshwater species, colonial or solitary |
|
|
Term
|
Definition
Jellyfish (Aurelia)
Solitary, free-floating medusa most prominent form, medusa w/o velum, mostly marine, mesogleal layer generally thick |
|
|
Term
|
Definition
Sea anemones (Metridium)
Corals
Sea fans
No medusa stage-polyp stage predominates life cycles, entirely marine, may be colonial or solitary, gastrovascular cavity divided by septa into chambers to increase digestive surface area |
|
|
Term
|
Definition
| most members undergo a regular alternation of generations between body forms that utilize asexual reproduction in the polyp form, and sexual reproduction in the medusa form |
|
|
Term
|
Definition
|
|
Term
|
Definition
| Elevated mound of tissue that expands or contracts to regulate size of mouth opening |
|
|
Term
|
Definition
| specialized region for attachment to the substrate |
|
|
Term
|
Definition
organs for sexual reproduction
Hydra are dioecious, meaning that an organism has either testes or overies, but not both |
|
|
Term
|
Definition
| ingestion of food and elimination of indigestible particles (egestion) |
|
|
Term
|
Definition
| Specialized stinging cells located in the epidermal layer of the tentacles and body wall |
|
|
Term
|
Definition
chamber within which extracellular digestion of prey occurs
only opening is through the mouth |
|
|
Term
|
Definition
outer tissue layer
specialized for protection |
|
|
Term
|
Definition
inner tissue layer
specialized for digestion |
|
|
Term
|
Definition
| inert, acellular, jellylike substance that aids in supporting the body |
|
|
Term
|
Definition
| having both testes and ovaries |
|
|
Term
|
Definition
| having seperate male and female sexes |
|
|
Term
|
Definition
|
|
Term
|
Definition
defining characteristic of cnidarians
used for capturing prey and as a deterrent to predators |
|
|
Term
|
Definition
| stinging capsule within cnidocytes |
|
|
Term
|
Definition
| Colonial hydrozoans connected by branches of a common gastrovascular cavity making them all part of a larger functioning body |
|
|
Term
|
Definition
| consists of a colony composed of both feeding polyps and reproductive polyps |
|
|
Term
|
Definition
- short lived stage devoted to reproduction
- free-swimming male & female medusae bud off from the reproductive polyps and release haploid sperm & eggs that fuse to form a diploid zygote
- zygote develops into a ciliated, swimming planula larva, which settles to the bottom of the ocean floor, attaches itself to the substrate, and begins to form a new generation of polyps through asexual budding
|
|
|
Term
|
Definition
| polyp specialized for feeding |
|
|
Term
|
Definition
|
|
Term
|
Definition
| elevated mound of tissue that expands or contracts to regulate size of mouth opening |
|
|
Term
|
Definition
| polyp specialized for reproduction |
|
|
Term
|
Definition
| product of asexual reproduction |
|
|
Term
|
Definition
common chamber within which extracellular digestion occurs
nutrients are distributed throughout organism |
|
|
Term
|
Definition
translucent outer covering of organism
serves protective function |
|
|
Term
|
Definition
stalk of fleshy tissue that supports the mouth
medusa |
|
|
Term
|
Definition
ingestion of food and egestion of indigestible particles
medusa |
|
|
