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A trab is 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.[1] Oxeas are sometimes employed in the central rod.[1][2] Trabs have a feather-like structure, or may form rods.[1][3]

Trabs are usually regularly spaced, usually at sub-millimetric intervals.[1] Further dendroclones may interconnect adjacent trabs, forming ladder-like structures.[2]

The presence and alignment of trabs is often related to the internal structure of canals within sponges.[4][verification needed]


  1. ^ a b c d Kruse, P. (1983). "Middle Cambrian 'Archaeocyathus' from the Georgina Basin is an anthaspidellid sponge". Alcheringa: an Australasian Journal of Palaeontology. 7: 49–58. doi:10.1080/03115518308619633. 
  2. ^ a b Bingli, L.; Rigby, J.; Zhongde, Z. (2003). "Middle Ordovician Lithistid Sponges from the Bachu-Kalpin Area, Xinjiang, Northwestern China". Journal of Paleontology. Paleontological Society. 77 (3): 430–441. doi:10.1666/0022-3360(2003)077<0430:MOLSFT>2.0.CO;2. JSTOR 4094792. 
  3. ^ Keith Rigby, J. (1973). "A New Anthaspidellid Sponge from the Silurian of Lake Timiskaming, Quebec". Journal of Paleontology. Paleontological Society. 47 (4): 801–804. JSTOR 1303055. 
  4. ^ Rigby, J.K.; Collins, D. (2004). Sponges of the Middle Cambrian Burgess Shale and Stephen Formations:. Royal Ontario Museum Contributions in Science. 1.