Gnathopod

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Related to Gnathopods: maxilliped, appendage

Gnath´o`pod


n.1.(Zool.) A gnathopodite or maxilliped. See Maxilliped.
References in periodicals archive ?
These plates are like shields protecting the proximal/upper parts of the two pairs of claws and five pairs of legs, or, as in amphipodal parlance, gnathopods and pereopods respectively.
The species name refers to the elongate carpus of gnathopod 1 in the female (Fig.
At the end of the experiment, the sex of each individual was determined using the size and shape of its first and second pairs of gnathopods, which are sexually dimorphic in amphipods (Hume et al., 2005).
Sexual dimorphism in amphipods: the role of male posterior gnathopods revealed in Gammarus pulex.
A male grabs a female with its gnathopods and the pair remains attached until the female molts.
The use of the male's gnathopods during precopulation in some gammaridean amphipods.
ABSTRACT.--Many amphipods (Crustacea: Amphipoda) exhibit sexual dimorphism in the size of a paired chelate appendage, the gnathopods. As with sexually dimorphic weapons and ornaments in other taxa, little is known of the evolutionary processes underlying species variation in the dimorphism.
At the same time, the amphipods utilized their first and second pairs of pereopods (gnathopods) to manipulate the initial silk strands, possibly pulling them tight to curl the kelp blade.
fasciatus are limited to a detrital diet because of the inability of their gnathopods or similar feeding mouthparts to handle larger food items (e.g., filamentous algae and invertebrate prey).
volutator produces a water current through its tube that brings suspended particles to the long setae fringing the gnathopods, thus indicating that it may also employ a filter-feeding mechanism.
Traits examined were (1) head length, which is correlated with total length and mass (Edwards and Cowell, 1992); (2) the sum of first and second antennal segments, which increases with instar (Geisler, 1944; Cooper, 1965); (3) length of tergite spines (mucronations) on the posterior margin of abdominal segments 1 and 2; (4) width of posterior gnathopods in males [these are subchelate thoracic appendages that are strongly sexually dimorphic and influence male mating success (Wellborn, 1993)]; (5) number of eggs in the marsupium, an index of fecundity; (6) egg size, and (7) size at maturity, which was estimated as the size of the smallest gravid female in the population sample.
However, we identified three divisions in this region (from two of the three preparations sectioned in the horizontal plane), which might reflect the presence of the three pairs of gnathopods that can be seen with either scanning electron microscopy or light microscopy [ILLUSTRATION FOR FIGURE 12B OMITTED].