Diagoniella Cambrian Sponge Fossils Assemblage
sp., (Animalia; Porifera; Class: Hexactinellida; Family: Protospongiidae)
inch): Matrix 50mm X 60mm Largest sponge 11mm
Wheeler Shale, Millard County, Utah
belong to the family Protospongiidae, which were a group of early
and primitive sponges of the Class Hexactinellida. Diagonella were
attached to the sea floor by long spines at the base of the sponge.
These spines are rarely preserved. The six-rayed spicules were not
fused into a net, so were relatively fragile as a result. These
sponges are very rare in the
Burgess Shale of British Columbia, and sponges are relatively uncommon
in the fossil record owing to their delicacy. This specimen exhibits
unusually fine preservation
The Fossils of the Burgess Shale by D. E. Briggs, et al.