Hederellid

Hederellids are extinct colonial animals with calcitic tubular branching exoskeletons. They range from the Silurian to the Permian and were most common in the Devonian period. They are more properly known as "hederelloids" because they were originally defined as a suborder by Bassler, who described about 130 species.[2] Although they have traditionally been considered bryozoans, they are clearly not because of their branching patterns, lack of an astogenetic gradient, skeletal microstructure, and wide range in tube diameters.[3] Work continues on assessing the true affinities of hederelloids, but they appear to be most closely related to phoronids and other lophophorates.[4][5]

Hederellids/Hederelloids
Temporal range:
Branching colonies of hederellids[1]
Scientific classification
Kingdom:
Animalia
Superphylum:
Lophotrochozoa
Phylum:
Phoronida?
Suborder:
Hederelloidea

Bassler, 1939
Families and genera

See classification

Classification
  • Family Hederellidae
    • Genus Diversipora
    • Genus Hederella
  • Family Reptariidae
    • Genus Cystoporella
    • Genus Hederopsis
    • Genus Hernodia
  • Three hederelloid species on a Devonian rugose coral
    Three hederelloid species on a Devonian rugose coral
  • Hederelloids encrusting a brachiopod from the Devonian of Ohio
    Hederelloids encrusting a brachiopod from the Devonian of Ohio
  • SEM image of a hederelloid from the Devonian of Michigan (largest tube diameter is 0.75 mm)
    SEM image of a hederelloid from the Devonian of Michigan (largest tube diameter is 0.75 mm)

References
  1. Taylor, P.D.; Wilson, M.A (2008). "Morphology and affinities of hederelloid "bryozoans"" (PDF). In Hageman, S.J.; Key, M.M. Jr.; Winston, J.E. (eds.). Bryozoan Studies 2007: Proceedings of the 14th International Bryozoology Conference. Virginia Museum of Natural History. pp. 301–309. Archived from the original (PDF) on 2010-03-26. Retrieved 2011-03-26.
  2. Bassler, R.S (1939). The Hederelloidea. A suborder of Paleozoic cyclostomatous Bryozoa. pp. 87:25–91. {{cite book}}: |work= ignored (help)
  3. Wilson, Mark A.; Taylor, Paul D. ""Pseudobryozoans" and the problem of encruster diversity in the Paleozoic". PaleoBios (21 (supplement to no. 2)): 134–135.
  4. Taylor, Paul D.; Wilson, Mark A. (2008). Hageman , S.J.; Key, M.M. Jr.; Winston, J.E. (eds.). Morphology and affinities of hederelloid "bryozoans" (PDF). Bryozoan Studies 2007: Proceedings of the 14th International Bryozoology Conference, July 1–8, 2007 (Special Publication 15 ed.). Boone, North Carolina. pp. 301–309. Archived from the original (PDF) on 2010-03-26.
  5. Taylor, Paul D.; Olev Vinn; Mark A. Wilson (2010). "Evolution of biomineralization in 'Lophophorates'". Special Papers in Palaeontology. 84: 317–333.

Further reading


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