Hederellid

Hederelloids
Temporal range: Silurian - Permian
Scanning electron microscope image of a hederelloid from the Devonian of Michigan.
Scientific classification
Kingdom: Animalia
Phylum: incertae sedis (possibly Phoronida)
Genera

See classification

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 (1939), who described about 130 species. 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 (Wilson and Taylor, 2001). Work continues on assessing the true affinities of hederelloids, but they appear to be most closely related to phoronids and other lophophorates (Taylor and Wilson, 2008; Taylor et al., 2010).

Classification

References

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