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Topics related to "Cnidaria"

Cnidaria
Cnidaria or Coelenterata , phylum of invertebrate animals comprising the sea anemones , corals , jellyfish , and hydroids. Cnidarians are radially symmetrical (see symmetry, biological ). The mouth, located at the center of one end of the body, opens into a gastrovascular cavity, which is us... Read more
Coelenterata
Coelenterata , another name for the phylum Cnidaria . ... Read more
sea fan
sea fan colonial marine animal forming erect, flattened, branching colonies in tropical and subtropical waters. Colonies may be several feet high and are often colorful, with purples, reds, and yellows predominating. The individuals, or polyps (see polyp and medusa ), have eight feathery tentacles... Read more
hydra
hydra , common name for freshwater organisms in the phylum Cnidaria, which includes jellyfish, sea anemones, and corals. Hydras are widely distributed in lakes, ponds, and sluggish streams. They are small, cylindrical, solitary organisms, the largest reaching about 1 in. (2.5 cm) in length. They att... Read more
invertebrate
invertebrate , any animal lacking a backbone. The invertebrates include the tunicates and lancelets of phylum Chordata, as well as all animal phyla other than Chordata. The major invertebrate phyla include: the sponges ( Porifera ), coelenterates ( Cnidaria ), echinoderms ( Echinodermata ), flat... Read more
sea pen
sea pen long, slender colonial organism of the same phylum as the jellyfish. Sea pen colonies are formed by several genera of the order Pennatulacea. The colony consists of a stalk formed by an organism called a primary polyp (see polyp and medusa ) and short branches formed by secondary polyps. T... Read more
sea anemone
sea anemone , any of the relatively large, predominantly solitary polyps (see polyp and medusa ) of the class Anthozoa, phylum Cnidaria. Unlike the closely related corals, these organisms do not have a skeleton. Sea anemones occur everywhere in the oceans, at all depths, but are particularly abunda... Read more
ectoderm
ectoderm layer of cells that covers the surface of an animal embryo after the process of gastrulation has occurred. This outer layer, together with the endoderm , or inner layer, is present in all early embryos. In the development of animals of the phyla Porifera , Ctenophora , and Cnidaria , t... Read more
jellyfish
jellyfish common name for the free-swimming stage (see polyp and medusa ), of certain invertebrate animals of the phylum Cnidaria (the coelenterates). The body of a jellyfish is shaped like a bell or umbrella, with a clear, jellylike material filling most of the space between the upper and lower... Read more
Ctenophora
Ctenophora , a small phylum of exclusively marine, invertebrate animals, commonly known as sea walnuts or comb jellies. Because they are so delicate that specimens are difficult to collect, little was known about them until the advent of blue-water scuba and submersible collecting. Ctenophores are c... Read more

Encyclopedia entries related to "Cnidaria"

Cnidaria
Book article from: The Columbia Encyclopedia, Sixth Edition Cnidaria or Coelenterata , phylum of invertebrate...two lifestyles are characteristic of the Cnidaria (see polyp and medusa ). The sessile...Class Anthozoa Class Anthozoa includes Cnidaria that have no jellyfish stage. This is...
corals and related fossils
Book article from: The Oxford Companion to the Earth ...sea anemones, and hydroids are all members of the phylum Cnidaria, a group of fairly simple aquatic organisms of both solitary...classes are recognized. The Hydrozoa are marine and freshwater cnidaria in which the polyp stage dominates; however, they only rarely...
sea anemone
Book article from: The Columbia Encyclopedia, Sixth Edition ...see polyp and medusa ) of the class Anthozoa, phylum Cnidaria. Unlike the closely related corals, these organisms do...in length. Sea anemones are classified in the phylum Cnidaria , class Anthozoa, subclass Zoantharia.
sea whip
Book article from: The Columbia Encyclopedia, Sixth Edition sea whip erect colony of marine animals of the phylum Cnidaria, with whiplike branches. The skeleton consists of a horny...marine communities. Sea whips are classified in the phylum Cnidaria , class Anthozoa, order Gorgonacea.
jellyfish
Book article from: The Columbia Encyclopedia, Sixth Edition ...and medusa ), of certain invertebrate animals of the phylum Cnidaria (the coelenterates). The body of a jellyfish is shaped...be blue or purple. Jellyfish are classified in the phylum Cnidaria, classes Hydrozoa and Scyphozoa.
hydra
Book article from: The Columbia Encyclopedia, Sixth Edition hydra , common name for freshwater organisms in the phylum Cnidaria, which includes jellyfish, sea anemones, and corals. Hydras are...also occur in American waters. Hydras are classified in the phylum Cnidaria , class Hydrazoa.
Hydrozoa
Encyclopedia entry from: The Gale Encyclopedia of Science Hydrozoa Hydrozoa is a class within the phylum Cnidaria, which includes sea anemones, corals, and jellyfish. The vast majority are marine species, but freshwater hydrozoans are known...
Jellyfish
Encyclopedia entry from: The Gale Encyclopedia of Science ...Jellyfish Jellyfish, also called medusae, are free-swimming, marine invertebrates in the class Scyphozoa (phylum Cnidaria). They have a gelatinous, translucent, domeshaped body and occur most commonly in warm, tropical seas, although...
medusa
Book article from: The Columbia Encyclopedia, Sixth Edition medusa in zoology, scientific name for the jellyfish , i.e., the free-swimming stage of various animals in the phylum Cnidaria . See polyp and medusa .
sea pen
Book article from: The Columbia Encyclopedia, Sixth Edition ...Sea pens are marine organisms; they are found on Atlantic and Pacific coasts in shallow to moderately deep water. Some reach a length of 2 ft (61 cm) or more. They belong in the phylum Cnidaria , class Anthozoa, order Pennatulacea.

Dictionary entries related to "Cnidaria"

Cnidaria
Book article from: A Dictionary of Zoology Cnidaria A phylum that comprises the sea anemones, jellyfish, and corals, and which is known from the late Precambrian . Cnidarians are...
Chondrophora
Book article from: A Dictionary of Zoology Chondrophora ( Chondrophorina ; phylum Cnidaria , class Hydrozoa ) An order of Cnidaria whose members are characterized by having a single, large polyp possessing a chitinous, gas-filled float supporting the other zooids . They have free medusae .
Coelenterata
Book article from: A Dictionary of Earth Sciences Coelenterata Name formerly applied to a phylum comprising both Cnidaria and Ctenophora. Today, when these two groups are universally separated in different phyla, the term ‘Coelenterata’ is sometimes used as a synonym for Cnidaria alone.
Scyphozoa
Book article from: A Dictionary of Earth Sciences Scyphozoa ( jellyfish ; phylum Cnidaria ) Class of marine, mainly pelagic medusoids, usually with four-part radial symmetry , in which the polyp stage is reduced or...
Milleporina
Book article from: A Dictionary of Earth Sciences Milleporina ( millepores ; massive hydrocorals ; class Hydrozoa ) Order of reef -forming Cnidaria whose members build massive, calcareous exoskeletons which have pores through which the polyps protrude. Milleporina are known...
Hydrozoa
Book article from: A Dictionary of Zoology Hydrozoa ( hydroids ; phylum Cnidaria ) A class of multicellular, mainly marine animals in which the cells are derived from two layers, epidermis and gastrodermis...
gastrovascular cavity
Book article from: A Dictionary of Zoology gastrovascular cavity A body cavity that has elaborated into a highly branched canal system with digestive and circulatory functions (e.g. the coelenteron of Cnidaria and Turbellaria ).
Zoantharia
Book article from: A Dictionary of Zoology Zoantharia ( Hexacorallia ; phylum Cnidaria , class Anthozoa ) A subclass of solitary and colonial anthozoans, with or without a calcareous exoskeleton, that are characterized...
polyp
Book article from: A Dictionary of Zoology polyp The soft-bodied, usually sedentary form of Cnidaria , consisting of a cylindrical trunk which is fixed at one end, with the mouth surrounded by tentacles at the other end. In Siphonophora the polyp has been modified for a pelagic , colonial existence.
Calyptoblastina
Book article from: A Dictionary of Zoology Calyptoblastina ( Leptomedusae , Thecata ; class Hydrozoa , order Hydroida ) A suborder of Cnidaria in which the colony is covered by a chitinous perisarc with cup-like extensions, the hydrothecae and gonothecae, which protects...

Related newspaper, magazine, and trade journal articles from HighBeam Research

Homeoboxes in sea anemones (Cnidaria; Anthozoa): a PCR-based survey of Nematostella vectensis and Metridium senile. (Polymerase Chain Reaction)
Magazine article from: The Biological Bulletin; 8/1/1997; ; 700+ words ; ...vectensis. Sea anemones belong to the Cnidaria, a prylum of tentacle-bearing, radially...Substantial phylogenetic evidence places the Cnidaria near the base of the Eumetazoa, possibly...the sister group to the Bilateria. The Cnidaria share with bilaterian animals several...
Phylogenetic placement of the enigmatic parasite, Polypodium hydriforme , within the Phylum Cnidaria.(Research article)
Magazine article from: BMC Evolutionary Biology; 5/9/2008; ; 700+ words ; ...16]. The assignment of Polypodium to Cnidaria is based primarily on morphological evidence...also fell within this clade, rendering Cnidaria paraphyletic. The second hypothesis...evidence that Polypodium is nested within Cnidaria and does not group with myxozoans. Results...
A new deepwater species of Stauromedusae, Lucernaria janetae (Cnidaria, Staurozoa, Lucernariidae), and a preliminary investigation of stauromedusan phylogeny based on nuclear and mitochondrial rDNA data.
Magazine article from: The Biological Bulletin; 6/1/2005; ; 700+ words ; ...class Scyphozoa. However, recent phylogenetic analyses of Cnidaria based on morphology (Marques and Collins, 2004) and molecular...have largely focused on their relationship to other groups of Cnidaria (e.g., Uchida, 1929, 1972; Thiel, 1966) rather than...
Neurofilament-like immunoreactivity in the sea anemone Condylactis gigantea (Cnidaria: Anthozoa).
Magazine article from: The Biological Bulletin; 10/1/1994; ; 700+ words ; ...nervous system, such as the one found in members of the phylum Cnidaria, are not well-defined. We use immunocytochemical techniques...tissues of the subtropical sea anemone Condylactis gigantea (Cnidaria: Anthozoa). Our studies suggest that neurons of this anthozoan...
Identification of synaptophysin-like immunoreactivity in the sea anemone Condylactis gigantea (Cnidaria: Anthozoa).
Magazine article from: The Biological Bulletin; 12/1/1994; ; 700+ words ; ...metazoans known to possess a nervous system are those of the phylum Cnidaria whose members include the familiar hydra, jellyfish, sea...system in the subtropical sea anemone Condylactis gigantea (Cnidaria: Anthozoa). Results of our studies suggest that the tissues...
Evidence for intercellular coupling and connexin-like protein in the luminescent endoderm of Renilla koellikeri (Cnidaria, Anthozoa).
Magazine article from: The Biological Bulletin; 12/1/1996; ; 700+ words ; ...development - is reflected in the wide distribution of these channels among metazoan phyla (Revel, 1988). Within the phylum Cnidaria, however, gap junctions were reported to be abundant in the Hydrozoa, but absent in the Scyphozoa and the Anthozoa (Mackie...
Shallow-water sea anemones (Cnidaria: Anthozoa: Actiniaria) and tube anemones (Cnidaria: Anthozoa: Ceriantharia) of the Galapagos Islands (1,2).
Magazine article from: Pacific Science; 10/1/2007; ; 700+ words ; Abstract: We provide the first inventory of members of orders Actiniaria (sea anemones sensu stricto) and Ceriantharia (tube anemones) from the Galapagos Islands. Based on observations and collections at 48 localities throughout the archipelago that span nearly a decade, we report on eight species
The innate immune repertoire in Cnidaria - ancestral complexity and stochastic gene loss.(Research)
Magazine article from: Genome Biology (Online Edition); 4/16/2007; ; 700+ words ; Authors: David J Miller (equal contributor) [1]; Georg Hemmrich (equal contributor) [2]; Eldon E Ball [3]; David C Hayward [3]; Konstantin Khalturin [2]; Noriko Funayama [4]; Kiyokazu Agata [4]; Thomas CG Bosch (corresponding author) [2] Background The innate immune system is the first line of
A review of the Octocorallia (Cnidaria: Anthozoa) from Hawaii and adjacent seamounts: the genus Narella Gray, 1870 (1).
Magazine article from: Pacific Science; 1/1/2008; ; 700+ words ; Abstract: The nine Hawaiian species of Narella are revised, including the description of six new species. All species but one (N. ornata) are described and illustrated using SEM; all species are keyed and included in a detailed table of comparison. A brief history of octocoral taxonomic research in
Life cycle of Chrysaora fuscescens (Cnidaria: Scyphozoa) and a key to sympatric ephyrae (1).
Magazine article from: Pacific Science; 1/1/2008; ; 700+ words ; Abstract: The life cycle of the Northeast Pacific sea nettle, Chrysaora fuscescens Brandt, 1835, is described from gametes to the juvenile medusa stage. In vitro techniques were used to fertilize eggs from field-collected medusae. Ciliated planula larvae swam, settled, and metamorphosed into