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The Irukandji jellyfish (/ ɪr ə ˈ k æ n dʒ i / irr-ə-KAN-jee) are any of several similar, extremely venomous species of rare box jellyfish. With a very small adult size of about a cubic centimetre (1 cm 3 or 0.061 in 3 ), they are both one of the smallest and one of the most venomous jellyfish in the world.
Although unspecified species of box jellyfish have been called in newspapers "the world's most venomous creature" [40] and the deadliest creature in the sea, [41] only a few species in the class have been confirmed to be involved in human deaths; some species are not harmful to humans, possibly delivering a sting that is no more than painful. [9]
Jellyfish, also known as sea jellies, are the medusa-phase of certain gelatinous members of the subphylum Medusozoa, which is a major part of the phylum Cnidaria. Jellyfish are mainly free-swimming marine animals, although a few are anchored to the seabed by stalks rather
Phyllorhiza punctata is a species of jellyfish, also known as the floating bell, Australian spotted jellyfish, brown jellyfish or the white-spotted jellyfish. It is native to the western Pacific from Australia to Japan, but has been introduced widely elsewhere. It feeds primarily on zooplankton.
Most jellyfish found in South Carolina waters are harmless. Researchers estimate there could be up to 300,000 species of jellyfish - a staggering figure for an organism with no brain, heart or lungs.
Cyanea nozakii or Cyanea nozaki (misspelling), commonly known as the ghost jellyfish, is a species of jellyfish found in the northern Pacific Ocean near the coasts of China and Japan. Along with other species of large jellyfish, it is showing a greater tendency to appear in large numbers and cause blooms.
Turritopsis dohrnii, also known as the immortal jellyfish, is a species of small, biologically immortal jellyfish [2] [3] found worldwide in temperate to tropic waters. It is one of the few known cases of animals capable of reverting completely to a sexually immature, colonial stage after having reached sexual maturity as a solitary individual.
Cephea cephea, also known as the crown jellyfish, or cauliflower jellyfish, is a species of jellyfish in the family Cepheidae. [1] It occurs in the tropical waters of the western Indo-Pacific to Northern Australia. The species was first described by Peter Forsskål in 1775 and originally given the name Medusa cephea.