TRAB
A trab is a structural element within a sponge formed by the fusion of dendroclones.
In the Anthaspidellidae, when spicules (usually dendroclones) connect at their tips to form a ladder-like structure, trabs may be formed. Oxeas are sometimes employed in the central rod. Trabs have a feather-like structure, or may form rods.
Trabs are usually regularly spaced, usually at sub-millimetric intervals. Further dendroclones may interconnect adjacent trabs, forming ladder-like structures.
The presence and alignment of trabs is often related to the internal structure of canals within sponges.
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