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.

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.

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

Cnidarians ' activities are coordinated by a decentralized nerve net and simple receptors.

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 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.

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

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

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.

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

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.

Notable examples of such releases include the albums Golden Country Origins by Grassroots Records of Australia and Hillbilly Haley by the British label, Rollercoaster, as well as the aforementioned German release by Hydra Records.

Nineteenth-century biologists reported that the Hydra was such a simple animal that it was possible to force one through gauze to separate it into individual cells ; if the cells were then left to themselves, they would regroup to form a hydra again.

Usually depicted as a lion, with the head of a goat arising from its back, and a tail that ended in a snakes's head, the Chimera was one of the offspring of Typhon and Echidna and a sibling of such monsters as Cerberus and the Lernaean Hydra.

The Shadow also battles collectives of criminals, such as The Silent Seven, The Hand, The Salamanders, and The Hydra.

There are many other Tyranid hive fleets that have been destroyed or are still emerging, such as Hive Fleets Jormungand, Colossus, Tiamet, Scarabus, Ouroboris, Nemesis, Reatherus and Splinter Fleet Hydra among many others.

While at the University of Chicago, Hyman also wrote significant taxonomic papers on such invertebrates as the Turbellaria ( flatworms ) and North American species of the freshwater cnidarian Hydra.

In a few simple species, such as Hydra, senescence is negligible and cannot be detected.

Due to economic developments taking place both within and outside the Ottoman empire, the 18th century witnessed the ascent of two merchant groups to prosperity: Albanian sailors of several Aegean islands, such as Hydra and Andros, became affluent maritime merchants and Rumeli muleteers of Slav, Greek and predominantly Vlach origins changed from muleteers and peddlers to independent merchants and bankers after the treaty of Passarowitz.

Hydra eat small crustaceans ( such as brine shrimp ), insect larvae, and annelid worms.

RAF fighters also supported the strategic bombing of Operation Crossbow, such as with long-range intruder operations that attacked German airfields and aircraft ( e. g., at take-off / landing ) at the time the Luftwaffe fighters would be scrambled against RAF Bomber Command ( see Operation Hydra ).

The quiet Amyclaeans were struck by the cursed and numerous forces of the swamp, unstoppable beings such as the monstrous serpent with nine heads, the Lernaean Hydra, which attacked from the swamps with poisonous venom, and whose heads would re-grow as quickly as Hercules could slice them off with his sword.

* Viper ( Madame Hydra ), one such character

He lured Captain America into a rematch, in which he insisted Hydra not intervene, and again lost ; however, when Hydra agents prepared to kill both Cap and himself, Batroc, incensed at such " men wizout honair ," switched sides to help Cap against Hydra.

Broadrick has also maintained a parallel career as a producer, producing records and remixes for groups such as Pantera, Isis, and Hydra Head labelmates Pelican.

He later gains varieties of " Bao Zakeruga " such as which conjures a giant claw which conjures a serpentine " Bao Zakeruga " which attacks by shooting its scales, and, a manifestation of electricity in the form of a giant Lernaean Hydra.

In the Marvel Comics Universe all subsequent iterations of Set ( such as the Egyptian Set and Greek Learnean Hydra mentioned above ) are said to be legends largely inspired by the original ancient serpent god Set.

In contrast to this Stoic-patristic view, Utopia implies that the nature of man is such that to rely on individual conscience to supply the deficiencies of municipal law is to embark on the bottomless sea of human sinfulness in a sieve.

Progress in predicting water conditions is encouraging, but little guidance is available to the man at sea on the use of such information.

Various international treaties attempt to reduce pollution caused by environmental threats such as oil spills, marine debris, and the incineration of toxic wastes at sea.

It is now used to refer to any island group or, sometimes, to a sea containing a large number of scattered islands such as the Aegean Sea.

In The Plague, a key description of Oran occurs early, when it is explained that the town is built in such a way that it " turns its back on the bay, with the result that it's impossible to see the sea, you always have to go to look for it.

Another passage from Proclus ' commentary on the Timaeus gives a description of the geography of Atlantis: That an island of such nature and size once existed is evident from what is said by certain authors who investigated the things around the outer sea.

In some cases, the term admiralty is used in a wider sense, as meaning sea power or rule over the seas, rather than in strict reference to the institution exercising such power.

The brain is the center of the nervous system in all vertebrate and most invertebrate animals — only a few invertebrates such as sponges, jellyfish, adult sea squirts and starfish do not have one, even if diffuse neural tissue is present.

Most of such organobromine compounds in the sea are made via the action of a unique algal enzyme, vanadium bromoperoxidase.

During the late 2nd century, the main ethnic change in the northern Black sea region was the immigration, from the Vistula valley in the North, of the Goths and accompanying Germanic tribes such as the Taifali and the Hasdingi, a branch of the Vandal people.

:" Birka is the main Geatish town ( oppidum Gothorum ), situated in the middle of Sweden ( Suevoniae ), not far ( non longe ) from the temple called Uppsala ( Ubsola ) which the Swedes ( Sueones ) held in the highest esteem when it comes to the worship of the gods ; here forms an inlet of the Baltic or the Barbaric Sea a port facing north which welcomes all the wild peoples all around this sea but which is risky for those who are careless or ignorant of such places ... they have therefore blocked this inlet of the troubled sea with hidden masses of rocks along more than 100 stadions ( 18 km ).

* Peninsulas of land jutting out into the sea, such as ' Portland Bill '

Appear mostly occupying favorable areas named geographically Umbrias, this is north hillsides or slopes of the mountainous areas that are oriented behind the sun, be cause the islands are in the northern hemisphere, between 600 and 1500 meters, thus benefiting from the humidity provided by the trade winds to form such a sea of clouds.

Among the fossils it contains are sea urchins, belemnites, ammonites and sea reptiles such as Mosasaurus.

Globotruncanid Foraminifera and echinoderms such as sea urchins and starfish ( sea stars ) thrived.

In some cases such as the Suez Canal the canal is simply open to the sea.

The word " cave " can also refer to much smaller openings such as sea caves, rock shelters, and ghettos.

However, even Walter Alvarez has acknowledged that there were other major changes on Earth even before the impact, such as a drop in sea level and massive volcanic eruptions that produced the Indian Deccan Traps, and these may have contributed to the extinctions.