CnidariaCnidaria ( ) is a phylum of animals containing over 11,000 species of aquaticinvertebrates found both in freshwater and marine environments (predominantly the latter), including jellyfish, hydroids, sea anemones, corals and some of the smallest marine parasites.
JellyfishSoft-bodied, aquatic invertebratesSpotted jellies swimming in a Tokyo aquariumJellyfish, also known as sea jellies or simply jellies, are the medusa-phase of certain gelatinous members of the subphylumMedusozoa, which is a major part of the phylumCnidaria. Jellyfish are mainly free-swimming marine animals, although a few are anchored to the seabed by stalks rather than being motile.
Aurelia (cnidarian)Aurelia is a genus of jellyfish that are commonly called moon jellies, which are in the class Scyphozoa. There are currently 25 accepted species and many that are still not formally described. The genus was first described in 1816 by Jean-Baptiste Lamarck in his book Histoire Naturelle des Animaux sans Vertèbres (Natural History of Invertebrates).
Box jellyfishBox jellyfish (class Cubozoa) are cnidariananimals distinguished by their box-like (i.e., cube-shaped) body. Some species of box jellyfish produce potent venom delivered by contact with their tentacles. Stings from some species, including Chironex fleckeri, Carukia barnesi, Malo kingi, and a few others, are extremely painful and often fatal to humans. Some species like the Carybdea murrayana produce a painful sting but are not fatal to humans.
StatocystThe statocyst is a balance sensory receptor present in some aquatic invertebrates, including bivalves, cnidarians, ctenophores, echinoderms, cephalopods, crustaceans, Proseriata and Catenulida (both are taxonomic groups of flatworms), and gastropods. A similar structure is also found in Xenoturbella. The statocyst consists of a sac-like structure containing a mineralised mass (statolith) and numerous innervated sensory hairs (setae).
SenseA sense is a biological system used by an organism for sensation, the process of gathering information about the surroundings through the detection of stimuli. During sensation, sense organs collect various stimuli (such as a sound or smell) for transduction, meaning transformation into a form that can be understood by the brain. Sensation and perception are fundamental to nearly every aspect of an organism's cognition, behavior and thought.
Organ (biology)In a multicellular organism, an organ is a collection of tissues joined in a structural unit to serve a common function. In the hierarchy of life, an organ lies between tissue and an organ system. Tissues are formed from same type cells to act together in a function. Tissues of different types combine to form an organ which has a specific function. The intestinal wall, for example, is formed by epithelial tissue and smooth muscle tissue.
ScyphozoaThe Scyphozoa are an exclusively marine class of the phylum Cnidaria, referred to as the true jellyfish (or "true jellies"). The class name Scyphozoa comes from the Greek word skyphos (σκύφος), denoting a kind of drinking cup and alluding to the cup shape of the organism. Scyphozoans have existed from the earliest Cambrian to the present.
Simple eye in invertebratesA simple eye or ocellus (sometimes called a pigment pit) is a form of eye or an optical arrangement which has a single lens without the sort of elaborate retina that occurs in most vertebrates. These eyes are called "simple" to distinguish them from "compound eyes", which have multiple lenses; they are not necessarily simple in the sense of being uncomplicated or basic.
TripedaliaTripedalia is a genus within the family Tripedaliidae that is part of the box jellyfish, also known as the Cubozoa. There are only three known species within Tripedalia: T. cystophora, and . BiologyTripedalia are relatively small in size, ranging from 11 to 15 mm. Both species have a cuboid bell and are transparent with a yellowish to brownish color. Their bells contain nematocyst warts that are mainly around the outline of T. cystophora and are thinly spread throughout .Chiropsella bronzieChiropsella bronzie is a species of box jellyfish. It is considered much less of a threat to humans than some of its relatives. The species was described in 2006, and is one of four species in the genus Chiropsella. Chiropsella bronzie can be found in shallow waters off the coast of Queensland, Australia.*As an Amazon Associate I earn from qualifying purchases.