Term
|
Definition
| specialized cells used for defense, feedand and attachment. found in Cnidarians |
|
|
Term
|
Definition
| stinging cells within cnidocytes |
|
|
Term
|
Definition
|
|
Term
| Exhibit ____ with an oral and aboral end and gastrovscular cavity |
|
Definition
|
|
Term
| Have _____level of organization |
|
Definition
| Diploblastic (two tissue layers) gastrodermis and epidermis seperated by mesoglea |
|
|
Term
| Most cnidarians possess 2 body forms |
|
Definition
asexual sessile polyps which reproduce by budding. (budding forms more polyps or may produce swimming medusae.
Dioecious medusa are free swimming and release eggs and sperm. (fertilization results in planula which settles to the substrate and forms a polyp. |
|
|
Term
|
Definition
| gastrodermis lines gastrovascular cavity where digestion, exchange of respiratory gas and wastes, and dischare of gametes occurs. |
|
|
Term
|
Definition
| Material enter/exit through the oral end of the gastrovascular cavity. Food is captured by nematocysts on tentacles and brought to mouth. Gastrodermal cells phagocytize food. Wasted are ejected by peristaltic contractions of nutrive-muscular cells |
|
|
Term
|
Definition
| support from water around them-free floating in currents |
|
|
Term
|
Definition
| water filled gastrovascular cavity against which contractile elements (epitheliomuscular cells) of body wall act _pulsating movements of medusa. |
|
|
Term
|
Definition
| from base to tentacles or may move as an inchworm using base and tentacles =polyps. |
|
|
Term
| most primitive nerous elements in the animal kingdom. Located below epidermis, near mesolea and interconnect into a 2 dimensional nerve net. |
|
Definition
|
|
Term
| concucts impulses around the body in response to localized stimulus. |
|
Definition
|
|
Term
| difference between weak and strong stimulas spplied to tentale |
|
Definition
weak causes tentacle to contract.
strong causes entire polyp to contrace. |
|
|
Term
| Small, commom, most are marine, but some freshwater representatives. |
|
Definition
|
|
Term
| Many have colonial polyps specialized for feeding, producing medusae, or defense |
|
Definition
|
|
Term
nematocysts only in the epidermis.
Gametes are epidermal and released outside the body-not in gastrovasuclar cavity.
Acellular mesoglea |
|
Definition
| distinguished feature of hydrozoa |
|
|
Term
| Medusa stage predominates. Shallow marine waters |
|
Definition
| Class hydrozoa: gonionemus |
|
|
Term
| Margin of medusa projects inward forming shelf-leke velum+jet propulsion system |
|
Definition
| Class hydrozoa:gonionemus |
|
|
Term
| Mouth at end of tube like manubrium-gastrovascular cavity- to 4 radial canals- encircling ring cananl |
|
Definition
| Class hydrozoa:gonionemus |
|
|
Term
| concentration of nerve cells-nerve ring- encircles the margin of the medusa. coordinates swimming movements |
|
Definition
| Class hydrozoa: Gonionemus |
|
|
Term
| All members are marine, medusa is the dominant stage. True jellyfish |
|
Definition
|
|
Term
|
Definition
|
|
Term
| mesoglea contains amoeboid mesenchyme cells |
|
Definition
|
|
Term
| Cnidocytes found in both gastrodermis and epidermis |
|
Definition
|
|
Term
| Gametes are gastrodermal origin |
|
Definition
|
|
Term
| some line the stinging nettle have dangerous stings |
|
Definition
|
|
Term
|
Definition
|
|
Term
| Plankton feeder – sinks in water, microscopic organisms trapped in mucus. Cilia carry food to margin of medusa. Four oral lobes hang from manubrium, scrape food from margin which is carried to the mouth |
|
Definition
|
|
Term
| Have eight specialized sensory structures or rhopalia, each with two olfactory pits, a statocyst and photoreceptors (ocelli |
|
Definition
|
|
Term
| Dioecious, gametes exit mouth, eggs lodge in oral lobes, fertilization occurs, planula develops |
|
Definition
|
|
Term
| May be colonial or solitary |
|
Definition
| Class Anthozoa: Sea anemones & corals |
|
|
Term
Lack medusae.
Cnidocytes lack cnidocils. |
|
Definition
| Class Anthozoa: Sea anemones & corals |
|
|
Term
Polyps differ from Hydrozoan in that:
Mouth leads to a pharynx which leads to gastrovascular cavity.
Mesenteries, which bear cnidocytes & gonads on free edges, divide gastrovascular cavity into sections.
Mesoglea contains amoeboid mesenchyme cells |
|
Definition
| Class Anthozoa: Sea anemones & corals |
|
|
Term
| Limited locomotion – glide on pedal disks, crawl on sides, walk with tentacles. May float using a gas bubble. |
|
Definition
| Sea anemone life strategies |
|
|
Term
| Feed on invertebrates & fishes using tentacles to capture prey |
|
Definition
| Sea anemone life strategies |
|
|
Term
Sexual & asexual reproduction
Asexual = piece of pedal disk breaks away to form new polyp or fission may occur.
Sexual –if monoecious male gametes mature 1st so self fertilization does not occur |
|
Definition
| Sea anemone life strategies |
|
|
Term
| Stony corals are colonial polyps that secrete calcium carbonate exoskeleton for protection |
|
Definition
|
|
Term
| Many have developed symbiotic relationships with algae (zoozanthellae) that reside within the epidermis or gastrodermis. They photosynthesize producing organic carbon for the coral polyps. Metabolism by polyps provide algae with nitrogen & phosphorus |
|
Definition
|
|
Term
| Coral bleaching occurs when environmental disturbances kills zoozanthellae |
|
Definition
|
|
