Glossary
Glossary terms beginning with: G
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- galleried (stereom)
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A stereom arrangement which results in well developed pore-alignment running in one direction only.
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- geniculate (spine)
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A spine whose shaft is bent or angled at its end
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- genital plate
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One of the plates of the apical disc that lies interradially at the top of an interambulacrum and is pierced by a gonopore.
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- gills
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See buccal sacs.
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- glassy tubercles
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A knob-like projection on the plate surface composed of glassy stereom. These never bear spines and are sutured to the test surface, not articulated.
- globiferous (pedicellaria)
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A pedicellaria that bears large poison glands. The distal tip of globiferous pedicellarial valves end either in one or more fang-like spikes, or in a ovate pore ringed by teeth.
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- gonopore
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The small perforation through a genital plate that marks the external opening to the gonads.
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- granule
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See miliary granule: a microscopic mound to which pedicellariae and fine spinlets attach.
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