Description: This is an as unusual member of the Desmospongia, the most diverse of modern-day sponges. Greater than 90% of the extant 5,000 known species of sponges are desmosponges. Such a representation in the fossil record is not maintained where less than half the known genera are of this type, a consequence of the fact that the skeletons do not fossilize readily. Desmosponges skeletons are composed of sponging fibers and/or siliceous spicules. Sponges are known from the late Precambrian, with few localities contributing to the fossil record over time. The specimen is a member of the type genus of the Family Choiidae, and has an unusual hat-like shape. It is thought to have lain on the bottom convex side up as seen in the restoration. This genus is far better known from the Burgess Shale and Chengjiang Biota of the Cambrian, but material from the Fezoata Formation of Morocco retains a number of relict taxa that survived into the Ordovician. It is the first I have ever seens.