gastrolith


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gastrolith

[′ga·strə‚lith]
(vertebrate zoology)
A pebble swallowed by certain animals and retained in the gizzard or stomach, where it serves to grind food.
References in periodicals archive ?
Early reports claimed that gastrolith calcium carbonate occurs either as calcite (Travis, 1963b; Ueno, 1980) or in a poorly crystalline state (Travis, 1963c).
The molt stages of each crayfish were determined in terms of gastrolith growth according to the molt mineralization index (MMI).
For each radiograph, the intensities of both the gastrolith and the cuticle that surrounds it were determined.
FTIR spectroscopic analysis of the cuticle and gastrolith were performed on a Bruker (Fourier transform spectrometer) equipped with a DTGS detector.
Mineralized cuticle and gastrolith samples were prepared for SEM inspection by rinsing in water and drying in air.
The rest is transported out of the apical membrane to form gastroliths.
1) The amount of calcium that flows into R cells is higher during postmolt, since the calcium coming from reingestion of exuviae is added to the calcium released from gastroliths and intracellular stores (Zanotto and Wheatly, 2003).
Cloning and expression of a cDNA encoding an insoluble matrix protein in the gastroliths of a crayfish, Procambarus clarkii.
Gillette, Utah's state paleontologist, identifies the rocks as gastroliths -- so called "stomach stones" that certain animals hold within their digestive tract to grind food.
Paleontologists often treat report of gastroliths skeptically because rivers can produce very similar stones.
However, the Seismosaurus fossil found with the most gastroliths held only 15 kg of stones, the largest no bigger than a grapefruit.
Or, he notes, dinosaurs may have habitually swallowed rocks for their mineral content, and the gastroliths that survived to be fossilized were those that were resistant to erosion and stomach acid.