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(Zoology) zoology a nematocyst


(ˈnaɪ də)

n., pl. -dae (-dē).
a nematocyst.
[1875–80; < Latin cnīdē nettle < Greek knidē]
References in periodicals archive ?
The distinctive pattern of expression of [beta]80868 by large cells in the epidermis in the oral region and in large cells scattered throughout the mesenteries does not correspond to any particular class of neuron or cnidocyte, nor to any particular kind of mini-collagen, the intracellular matrix that reinforces the walls of the cnidocyst (Marlow et al.
We were also able to demonstrate that cnidocyte firing itself is effected by the light environment and that these effects are reversed when components of the phototransduction cascade are turned off," Dr Plachetzki added.
Not surprisingly, therefore, cnidocyte discharge is tightly regulated, presumably to help ensure that these cnidocytes are used only when there is a high probability that discharge will achieve the desired results such as capture of prey, locomotion, or defense.
Sensory supporting cells within the tentacle epidermis surround each cnidocyte (Watson and Hessinger, 1988; Hessinger and Ford, 1988).
Cnidocyte discharge is very tightly regulated, presumably to minimize what is likely to be the considerable energetic cost of replacing very complex cells that can only be used once.
Cnidocyte mechanoreceptors are tuned to the movements of swimming prey by chemoreceptors.
In anemone tentacles, each cnidocyte is surrounded by two or more supporting cells.
These mechanisms control the discharge of cnidae through the interplay of both local receptors associated with the cnidocytes that trigger discharge (Watson and Hessinger, 1988, 1991) and remote receptors that modulate cnidocyte responsiveness (as reviewed in Thorington and Hessinger, 1988b).
Jellyfish sting using nematocysts, which are located in special cells called cnidocytes on the tentacles.
Known only by its species name, Chrysaora achlyos (kris-AH-oh-rah ACK-lee-us), the creature sported 9-meter (30-foot)-long tentacles riddled with stinging cells called cnidocytes (NYE-doh-sites).