eyestalk

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eyestalk

(ī′stôk′)
n.
A movable structure in certain crustaceans, such as crabs and shrimp, that bears an eye at the tip.
References in periodicals archive ?
Then carefully hold the female and squeeze the eyestalk of one side with the heated forceps tip.
ESA was accomplished by cutting the eyestalks at their base and then re-packing the crab in ice to prevent excessive bleeding.
Key words: Eyestalk ablation, ecdysone induction, hepatopancreas, gene expression
A possible function of dopamine, as endogenous neurotransmitter, stimulating the secretion of GIH by the sinus gland in the eyestalks has been proposed (Fingerman 1997).
The slug settles in the crab's underside and grows, forming a bulge in its shell and sprouting a set of root-like tendrils that spread throughout the crab's body, even wrapping around its eyestalks.
To protect themselves, they hide in mud or sand with just their eyestalks sticking out.
It seemed a fair and accurate title for a shrimp that lacked the eyestalks and corneas other shrimp use for vision.
These include eye migration toward the end of the eyestalks and a change in the pigment on the foot from orange to dark green (Davis et al.
25A): Head-foot mostly greyish, irregularly mottled with darker spots and blotches; eyestalks pale, but tentacles more or less uniformly dark; forehead and snout brown; tip of snout shallowly indented in mid-line; skin texture relatively smooth.
For example, the ocular area becomes broadened with increasing width of the carapace; the subocular plate and the epistome are gradually projected forward and the eyestalks degenerate.
An effort was made to locate buried crabs by swimming close to the bottom and looking for irregularities in the bottom or protruding crab eyestalks.
Y-Organs are regulated, at least in part, by molt-inhibiting hormone (MIH), a peptide produced and released by the X-organ/sinus gland complex of the eyestalks.