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Chironex fleckeri is the largest of the cubozoans (collectively called box jellyfish), many of which may carry similarly toxic venom. Its bell usually reaches about 16 cm (6.3 in) in diameter but can grow up to 35 cm (14 in). [8] From each of the four corners of the bell trails a cluster of 15 tentacles. [4]
Whereas some other jellyfish have simple pigment-cup ocelli, box jellyfish are unique in the possession of true eyes, complete with retinas, corneas and lenses. [13] Their eyes are set in clusters at the ends of sensory structures called rhopalia which are connected to their ring nerve. Each rhopalium contains two image-forming lens eyes.
Comparative research on genetic and molecular makeup of box jellyfishes' eyes versus more derived eyes seen in vertebrates and cephalopods focuses on: lenses and crystallin composition, synapses, and Pax genes and their implied evidence for shared primordial (ancestral) genes in eye evolution. [49] Box jellyfish eyes are said to be an ...
They’re especially dangerous to children, conservationists say.
A scale illustration of an Irukandji jellyfish and its tentacles.Below the jelly's medusa bell are two polyp forms of the species.. Irukandji jellyfish are very small, with a bell about 5 millimetres (0.20 in) to 25 millimetres (0.98 in) wide and four long tentacles, which range in length from just a few centimetres up to 1 metre (3.3 ft) in length.
Deepwater Exploration of the Marianas team was taking a look around the Enigma Seamount when they noticed a particularly brilliant jellyfish. SEE ALSO: 93 percent of the Great Barrier Reef has ...
Chiropsalmus quadrumanus is a cube-shaped, colourless, transparent jellyfish with a diameter of about 14 centimetres (5.5 in) and height a little less than this. The body is composed of a gelatinous material and the top edges are rounded while the top surface is flat.
The fish's species was, at first, hard to identify because it appeared to have no eyes, mouth, tentacles, front or back. NPR reports scientists first believed it might be a whale placenta.