Cnidarians are classified into four main groups: the almost wholly sessile Anthozoa ( sea anemones, corals, sea pens ); swimming Scyphozoa ( jellyfish ); Cubozoa ( box jellies ); and Hydrozoa, a diverse group that includes all the freshwater cnidarians as well as many marine forms, and has both sessile members such as Hydra and colonial swimmers such as the Portuguese Man o ' War.

Cnidarians are distinguished from all other animals by having cnidocytes that fire like harpoons and are used mainly to capture prey but also as anchors in some species.

The majority of animals more complex than jellyfish and other Cnidarians are split into two groups, the protostomes and deuterostomes.

Cnidarians, which include among others the jellyfishes, are another phylum with many tentacled specimens.

Cubozoan ocelli are the most complex of Cnidarians, and resemble the image-forming eyes of squid, octopuses, and vertebrates.

Cnidarians are members of the phylum Cnidaria.

One of the most recognizable types of holoplankton are Cnidarians ; also known as jellyfish.

Some insects, amphibians, molluscs, crustaceans, Cnidarians, echinoderms and tunicates undergo metamorphosis, which is usually accompanied by a change of habitat or behavior.

simple: Category: Cnidarians

Cnidarians were for a long time grouped with Ctenophores in the phylum Coelenterata, but increasing awareness of their differences caused them to be placed in separate phyla.

Cnidarians form an animal phylum that is more complex than sponges, about as complex as ctenophores ( comb jellies ), and less complex than bilaterians, which include almost all other animals.

Cnidarians such as Hydra and the sea anemone Nematostella vectensis have become attractive model organisms to study the evolution of immunity and certain developmental processes.

Cnidarians ( jellyfish and corals ), echinoderms and polychaetes were spread across the other orders.

Since fossils of rather modern-looking Cnidarians have been found in the Doushantuo lagerstätte, the Cnidarian and bilaterian lineages would have diverged well over.

Cnidarians often have huge numbers of cnidocytes on their tentacles.

* It has been used as a term to describe the reproductive methods of some forms of Mollusks, Cnidarians, Sponges and Ctenophores.

Within 2 to 3 weeks, the tertiary colonizers-the macrofoulers have attached including tunicates, mollusks and sessile Cnidarians.

Those three other great activities of the Persians, the bath, the teahouse, and the zur khaneh ( the latter a kind of club in which a leader and a group of men in an octagonal pit move through a rite of calisthenics, dance, chanted poetry, and music ), do not take place in buildings to which entrance tickets are sold, but some of them occupy splendid examples of Persian domestic architecture: long, domed, chalk-white rooms with daises of turquoise tile, their end walls cut through to the orchards and the sky by open arches.

But more important, and the thing which the casual traveler and the blind sojourner often do not see, is that these places and activities are often the settings in which Persians exercise their extraordinary aesthetic sensibilities.

His other activities are not so easily recovered.

In still others which are barely on the threshold of the transition into modernity, the decade can bring significant progress in launching the slow process of developing their human resources and their basic services to the point where an expanded range of developmental activities is possible.

More importantly, several of the more advanced of the less developed countries have found through experience that they must plan their own complex investment programs for at least 5 years forward and tentatively for considerably more than that if they are to be sure that the various interdependent activities involved are all to take place in the proper sequence.

In this, as in so many aspects of our development assistance activities, the incentive effects of the posture we take are the most important ones.

If they feel that we are taking a long-term view of their problems and are prepared to enter into reasonably long-term association with them in their development activities, they will be much more likely to undertake the difficult tasks required.

The activities of the Planning Division are defined in considerable detail in the enabling act of the Development Council, which assigns to the agency both broad responsibilities and specific duties in the field of planning.

These objectives are stated here because of their importance in understanding the current activities of the Planning Division.

Proceeds realized from these pageants are used by the Jaycees to help support their various youth, health, welfare and community betterment activities throughout the state.

Research and development activities undertaken by the Secretary shall be coordinated or conducted jointly with the Department of Defense to the end that developments under this Act which are primarily of a civil nature will contribute to the defense of the Nation and that developments which are primarily of a military nature will, to the greatest practicable extent compatible with military and security requirements, be available to advance the purposes of this Act and to strengthen the civil economy of the Nation.

and ( C ) to finance, for not more than three years beyond the end of said period, such activities as are required to correlate, coordinate, and round out the results of studies and research undertaken pursuant to this Act: Provided, That funds available in any one year for research and development may, subject to the approval of the Secretary of State to assure that such activities are consistent with the foreign policy objectives of the United States, be expended in cooperation with public or private agencies in foreign countries in the development of processes useful to the program in the United States: And provided further, That every such contract or agreement made with any public or private agency in a foreign country shall contain provisions effective to insure that the results or information developed in connection therewith shall be available without cost to the United States for the use of the United States throughout the world and for the use of the general public within the United States.

In addition to the basic programs in wavelength standards, spectroscopy, solid state physics, interactions of the free electron and atomic constants which are necessary to provide the foundation for technological progress, the Bureau has strengthened its activities in laboratory astrophysics.

These extra-curricular activities are conducted under supervision of the Director of the Student Workshop.

Week-end activities for the entire campus are planned by the Co-op Board.

Because agricultural activities are seasonal and the areas of production and harvest of many foods are widely scattered geographically, and because of the high cost of transporting bulk food items any substantial distance to a central processing location, the use of large central processing stations, where low-cost radiation facilities approaching the megawatt range might be utilized, is inherently impracticable.

All of these activities are geared to a top-priority communication system, and practice tests have been held to assure that everything will work smoothly.

The proclamation of the churches is almost totally confined to pastoral contacts by the clergy ( 17.3 per cent of new members ) and friendly contacts by members ( over two thirds if organizational activities are included ).

The boule coordinated the activities of the various boards and magistrates that carried out the administrative functions of Athens and provided from its own membership randomly selected boards of ten responsible for areas ranging from naval affairs to religious observances.

A central committee in San Felipe de Austin coordinated their activities.

* Trade-Offs in Logistical Activities: The above activities must be well coordinated in order to achieve the lowest total logistics cost.

UNCCD activities are coordinated with the secretariats of other relevant international bodies and conventions, like those of the UN Framework Convention on Climate Change ( UNFCCC ) and the Convention on Biological Diversity ( CBD ).

Immediately on arrival, she coordinated the activities of the local Maquis ( led by Jacques Dufour ) in sabotaging communication lines during German attempts to stem the Normandy landings.

As Chairman of the National Defense Research Committee ( NDRC ), and later Director of the Office of Scientific Research and Development ( OSRD ), Bush coordinated the activities of some six thousand leading American scientists in the application of science to warfare.

A central committee in San Felipe de Austin coordinated their activities.

The regional forester has broad responsibility for coordinating activities among the various forests within the region, for providing overall leadership for regional natural resource and social programs, and for coordinated regional land use planning.

Some of the activities coordinated by The Graduate School Staff:

From 1996 to 2000, he represented CSA astronauts and coordinated their activities as the Chief Astronaut for the CSA.

In the history of ideas the Carolingian Renaissance stands out as a period of intellectual and cultural revival in Europe occurring from the late eighth century, in the generation of Alcuin, to the 9th century, and the generation of Heiric of Auxerre, with the peak of the activities coordinated during the reigns of the Carolingian rulers Charlemagne and Louis the Pious.

In New Guinea, logistics and construction activities were coordinated by task force engineer staffs.

* Supply chain, coordinated system of organizations, people, activities, information and resources involved in moving a product or service from supplier to customer

Agudath Israel's federal activities are coordinated by Rabbi Abba Cohen, the Director and Counsel of the organization's Washington Office.

* 2007: Teradata announces partnership with SAS involving further technical integration of their respective products and coordinated marketing, sales, and services activities.

In January 2008 there was established an International Barents Secretariat which is to provide technical support for the multilateral coordinated activities within the framework of the Barents Euro-Arctic Council and the Barents Regional Council.

In 1994, Hanssen expressed interest in a transfer to the new National Counterintelligence Center, which coordinated counter-intelligence activities.

A sociologist who examined the memberships of such neoconservative organizations ultimately concluded that “ the activities of fourteen organizations were coordinated by individuals who comprised a web of interlocking memberships .”

A Combined Operations Center under Colonel Bouathong Phontivongsa coordinated air activities with the Army General Staff.

Although their activities were coordinated by central authorities, each state corporation was supposed to retain a measure of autonomy within its own sphere.

* Anti-Capitalist Convergence, organizations which coordinated activities by the social justice, anarchist and environmentalist anti-capitalists

Sometimes his conversations are intercut with scenes of the Sandbaggers operating in the field ; other times the audience sees more of the buzzing " Ops Room ," where missions are coordinated and controlled, than of the Sandbaggers ' actual field activities.

Most of those involved shared the view only that Washington was a less than perfect commander in chief, and very few of their activities were coordinated.