Classification formerly 2 phylum names 1. Coelenterata – hollow gut 2. Cnidaria – nettle. Results FILUM CNIDARIA (COELENTERATA) Drive Core Phase 1. Filum Cnidaria dan Ctenophora termasuk kelompok hewan coelenterata. 2 body types. Diploblastic- two germ layers. Phylum Cnidaria. Mesoglea not true layer. 6. Filum Cnidaria: ubur-ubur, terumbu karang, hydroids, anemone laut.

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Once the cnidae have matured within the nudibranchthey can be used in its own defense.

They sequester the space that is therefore made unavailable to other organisms, thus having a profound impact on community structure. In scyphozoans, this takes the form of a diffuse nerve net, which has modulatory effects on the nervous system.


Most hydroid polyps secrete a horny, chitinous external skeleton that is essentially a tube around the polyp and the network of stolons that interconnect members of a colony. The major distinguishing feature of the cubozoans is that each polyp transforms entirely into filu, medusa.

Fundamentals of Aquatic Ecology. Respiration and excretion in cnidarians are carried on by individual cells that obtain their oxygen directly from water—either that in the coelenteron or that of the environment—and return metabolic wastes to it.


Cnidarians are generally thought to have no brains or even central nervous systems. Blue corals the order Helioporacea have skeletons of crystalline calcareous fibres fused into sheets, which are used for jewelry. Keep Exploring Britannica Bird. Invertebrate Zoology 7 ed. Recent phylogenetic analyses support monophyly of cnidarians, as well as the position of cnidarians as the sister group of bilaterians. Sea anemonescoralssea pens.

The nematocysts of cnidarians restrict potential predators to a limited array of specialists. Annual Review of Ecology, Evolution, and Systematics. There are species of sea anemones that live on gastropod shells inhabited by hermit crabsa type of crustacean that must change shells as it grows. Since the tissue layers are very thin, they provide too little power to swim against currents and just enough to control movement within currents.

Introduction to Cnidaria

Cnidarians are not immune from predation. Coral Acropora muricata Scleractiniapart of Hexacorallia.

These include gas-filled floats called pneumatophorespulsating, locomotory structures called nectophores, and flattened, protective individuals called bracts or phyllozooids. The layer that faces outwards, known as the ectoderm “outside skin”generally contains the following types of cells: While reef-forming corals are almost entirely restricted to warm and shallow marine waters, other cnidarians can be found at vnidaria depths, in polar regionsand in freshwater.

The Rattlesnake voyage anatomy and physiology circulatory systems In circulatory system: About project SlidePlayer Terms of Service. Some, such as colonial corals with minute polyps, feed on particulate material gathered in mucus impelled to the mouth by cilia microscopic hairlike projections of cells capable of beating or folum.


Introduction to Cnidaria

Most obtain the majority of their food from predation but some, including the corals Hetroxenia and Leptogorgiadepend almost completely on their endosymbionts and on absorbing dissolved nutrients. Cnidarian s have two main body forms: A few deep-sea anemones form the shells in which their crabs dwell. This enables corals to recover even after apparently being destroyed by predators.

History of Life 3 ed. Other hydrocorals have purplish skeletons.

Food is taken in and wastes are discharged through the mouth. Scyphomedusae can weigh more than a ton, whereas hydromedusae are, at most, a few centimetres across. Polyps of most hydroids, hydrocorals, and soft and hard coralshowever, proliferate asexually into colonies, which can attain much greater size and longevity than their component polyps.

Swimming is coordinated by the nervous system.