There are four classes of cnidarians. Syphozoans, Hydrozoans, Cubozoans, and Anthozoans. Anthozoans don't have a medusa stage of life, so they don't get credit for being a jellyfish because they are never free swimming medusae. Syphozoans are considered by scientists to be a 'jellyfish', but the other two classes are considered jellies also (with reservations) because even though they have two layers of epithelial tissue with mesoglea (non-living gelatinous secretion) between the exodermal and the endodermal layers of 'skin', they are not radially symmetric. Other invertebrates of the gelatinous marine environment include the ctenophores and scalps.
Scyphozoans are characterized by their radially symmetric, umbrella shaped bodies.
Hydrozoans are characterized by their colony of polyps, which are not radially symmetric.
Cubozoans are characterized by their four sided, roughly cubical shaped bodies. They are also characterized by their 24 eyes, ability to perceive their environment, and actively both evade predators and pursue prey. These guys are not drifters, like most of the members of the 'jellyfish' distinction.
Main classes are Syphozoa, Staurozoa, Cubozoa, Hyrdozoa and Anthozoa .
cnidarians move from place to place. sponges dont.
Jellyfish and Coral and sea anemones
Cnidarians aretypeof animals.They are heterotrophic. They feed on other animals
Most cnidarians have tentacles with stinging cells surrounding their mouth. The mouth is the only body opening. All cnidarianshave radial symmetry.
ffere
from other animals they get it
no way
Online college classes are not very different from classes in regular colleges. They both offer classes in English, history, sciences, psychology and other fields.
no Not exactly as in depth as other students that may be come doctors but they take classes that are similar.
Nearly all corals and some other cnidarians are attached and are called sessile .
One is a fish, the other is a mammal
There are nine (9) hazard classes in the hazard classification system used by the US Department of Transportation and other transportation agencies around the world. There may be a different number of classes in other processes.