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Related to ecdysis: instar


n. pl. ec·dy·ses (-sēz′)
The shedding of an outer integument or layer of skin, as by insects, crustaceans, and snakes; molting.

[Greek ekdusis, a stripping off, from ekduein, to take off : ek-, out, off; see ecto- + duein, to put on.]


n, pl -ses (-ˌsiːz)
(Zoology) the periodic shedding of the cuticle in insects and other arthropods or the outer epidermal layer in reptiles. See also ecdysone
[C19: New Latin, from Greek ekdusis, from ekduein to strip, from ek- ex-1 + duein to put on]
ecˈdysial adj


(ˈɛk də sɪs)

n., pl. -ses (-ˌsiz)
the shedding or casting off of an outer coat or integument by snakes, crustaceans, etc.
[1850–55; < Greek ékdysis=ekdý(ein) to strip off (ek- ec- + dýein to cause to enter) + -sis -sis]
ec•dys′i•al (-ˈdɪz i əl, -ˈdɪʒ əl) adj.


the process of shedding skin or other covering, typical of snakes and some insects. Cf. endysis.ecdysial, adj.
See also: Biology


The molting of the exoskeleton of arthropods.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.ecdysis - periodic shedding of the cuticle in arthropods or the outer skin in reptilesecdysis - periodic shedding of the cuticle in arthropods or the outer skin in reptiles
shedding, sloughing - the process whereby something is shed
References in periodicals archive ?
2013) suggested that infections caused by mikrocytid parasites may damage the antennal gland and because it also regulates fluid volumes within crabs, this could cause mortality especially during ecdysis when a large volume of water is taken up by crabs to help remove the old carapace (Chung et al.
The increase in the concentrations of the biochemical constituents of the hemolymph, particularly carbohydrates and lipids observed at during the pre- ecdysis period, could be explained by the digestion of the old cuticle releasing proteins and carbohydrate in the hemolymph, and an inhibition of secretion of the new cuticle following diflubenzuron treatment [27].
The insects were maintained as previously described in a dark incubator with a 12:12 h light/dark photoperiod and were checked daily for ecdysis or death.
A specimen having different article numbers in the left and right uropod could thus reflect an incomplete ecdysis.
However, the relative importance of fossil scorpions in ancient ecosystems is difficult to assess because of the arthropod trait of growth through ecdysis.
Thermoregulation facilitates quicker digestion of meals, decreases gestation time of gravid females, and is critical during ecdysis.
Adaptations of the branchial ectoparasite Probopyrus pandalicola (Isopoda: Bopyridae) for survival and reproduction related to ecdysis of the host, Palaemonetes pugio (Caridea: Palaemonidae).
Stimuli for cuticle formation and ecdysis in vitro of the infective larva of Anisakis sp.
The crabs those lacking four legs that served as controls that underwent ecdysis at a rapid rate.
In a generally more mobile and active species, Coluber constrictor, Plummer & Congdon (1994) found that 90% of inactivity was associated with ecdysis.