gnathopod

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Related to Gnathopods: maxilliped, appendage

gnathopod

[′nā·thə‚päd]
(invertebrate zoology)
Any of the crustacean paired thoracic appendages modified for manipulation of food but sometimes functioning in copulatory amplexion.
References in periodicals archive ?
Although a functional role for enlarged gnathopods has been described or suggested for a few amphipod species (e.
Before the female's molt males use their anterior gnathopods (not enlarged) to grasp the female's second coxal segment in a precopulatory mate-guarding behavior (Borowsky, 1984).
In Hyalella only the posterior gnathopods are enlarged, and these are approximately 15 times larger in males than females.
Also, I explore patterns of fluctuating asymmetry of gnathopods and ask whether fluctuating asymmetry is related to male mating success.
That is, I ask whether fitness variation in males is associated with possession of larger or smaller gnathopods relative to body size.
Levels of fluctuating asymmetry in gnathopods were similar for South Lake (mean [pm] SE = 0.
volutator switches to filter feeding by using the long setae on the second pair of gnathopods to retain suspended particles brought into the tube by the pleopodal current.
The position of the long V-shaped plumose setal filter on the second pair of gnathopods effectively ensures that all water runs through the filter without any bypass (Fig.
Traits that were generally correlated with body size within populations (antennal segment number, spine length, gnathopod size, and egg number) were size-adjusted by calculating the expected trait value for a population at the overall mean body size for all Hyalella in the study (0.
I analyzed major differences between the morphotypes with analysis of variance, with populations within a morphotype as replicates and either population means (body size, size at maturity and egg size) or size-adjusted trait values (antennal segment number, spine length, egg number and gnathopod width) as data.
Males of the two morphotypes did not differ in size-specific values of antennal segment number or gnathopod size, but did differ in spine length.
The gnathopods of the cyprid form an oral cone, which opens to the ventral surface of the cephalon [ILLUSTRATION FOR FIGURES 1, 2, 12A OMITTED].