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| Asterias |
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| ‹ Arthropods › |
| Arthropods are any invertebrate organisms with segmented bodies and jointed limbs. They have bilateral symmetry (as with most motile organisms) and an open circulatory system. They respire by means of gills, tracheae or spiracles, and they all have an exoskeleton composed largely of chitin. |
| Links: |
| http://www.sasionline.org/arthzoo/arthchar.htm |
| Cambarus |
Crayfish usually reside in streams and lakes, and often hide themselves under rocks or logs. They are most active at night and enjoy eating snails, algae, insect larvae, worms, tadpoles, and some eat vegetation (water plants). Crayfish also enjoy eating corn and salmon eggs. Most crayfish live short lives, sometimes less than two years. This means that rapid and high-volume reproduction must occur. Most reach their sexual maturity within a few months of life, but fertilization and egg laying usually occur the following spring. |
| Links: |
| http://www.mackers.com/crayfish/info.htm |
| Romalea |
| Grasshoppers, like other insects, have a very unique way of distributing oxygen to its tissues. The respiratory system consists of internal tubes that branch all throughout the body and delivery air directly to body cells. The oxygen diffuses across the moist membranes into the cells. This process not only delivers oxygen, but is also partly responsible for all insects’ small size. Since tiny tubes need to make contact with almost every single cell within the organism’s body, there has to be a small number of cells. Too many cells (meaning too large of an organism) would be impossible to oxygenate with such a system. |
| ‹ Echinoderms › |
| Echinoderms are extremely common on the beach; odds are you have seen a starfish or a sand dollar lying around somewhere (yes, sand dollars ARE alive!). These are very common examples of the radially symmetric echinoderms. All organisms belonging to this group have water vascular systems for the transportation of water throughout the body, and many have “tube feet”—suckers on the ventral side of the organism used to move or grip objects. |
| Links: |
| http://www.ucmp.berkeley.edu/echinodermata/echinodermata.html |
| Asterias |
| Not unlike humans, starfish enjoy clams and oysters too. However, they go about digesting in a very different way. First, the arms of the organism grab the closed bivalve by its tube feet. The starfish then turns its stomach inside out, though its mouth and into the narrow opening between the shells of the clam or starfish. The amazing digestive system of the starfish secrets juices that being digestion of the clam or oyster in its own shell. A little bit different than what Patrick does on the show Spongebob Squarepants, huh? |
| Need an easy way to remember the path of water flow? |
| Think of this easy sentence: |
| Mean
Sisters RIpped RAndy’s
Assignment Today
for: Madreporite; Stone canal; RIng canal; RAdial canal; Ampulla; Tube foot |
updated 3-12-06