Glossary
Glossary terms beginning with: T
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- tag
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A smooth, slightly elevated, tongue-like flange that borders the buccal notch and runs along the adradial margin of interambulacral plates. It supports the buccal sacks.
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- test
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The series of plates that make up the sea urchin skeleton.
- tetrabasal (disc)
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An apical disc composed of just 4 genital plates and five ocular plates. Genital plate 5 is missing.
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- tooth
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Part of the Aristotle's lantern; the five teeth form the biting tip of the lantern.
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- trabeculae
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The term applied to the calcitic struts forming stereom.
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- tridactylous (pedicellaria)
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A kind of pedicellaria with simple rather straight blades and without glands. Blades meet along their distal part.
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- trifoliate (pedicellaria)
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obsolete name for triphyllous pedicellaria
- trigeminate (plating)
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A compound ambulacral plate composed of three elements.
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- triphyllous (pedicellaria)
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A kind of pedicellaria with small, leaf-like blades.
- triserial
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Arrangement of pore-pairs (tube-feet) forming three separate series in each half-ambulacrum.
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- tube-feet
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An external flexible tentacle from the water vascular system. In most echinoids there is one tube-foot to each ambulacral element.
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- tubercle
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A knob-like projection on the plate surface that bears a spine. Unlike granules, tubercles have a distinct mamelon on which the spine articulates.
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