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The chaetetid skeleton has now been shown to be of polyphyletic origin and with little systematic value. Extant chaetetids are also described. This skeleton is now known from three demosponge orders (Hadromerida, Poecilosclerida, and Agelasida).
Hamacantha esperoides is a species of demosponge. It is commonly known as the fibrous sponge. It occurs off the southern and western coasts of South Africa, off the coast of Namibia, and off the southeast coast of South America. [2] [3]
While it has been argued that this 'sponge biomarker' could have originated from marine algae, recent research suggests that the algae's ability to produce this biomarker evolved only in the Carboniferous; as such, the biomarker remains strongly supportive of the presence of demosponges in the Cryogenian.
It is the most speciose demosponge order with over 2200 species (World Porifera Database [2]). It contains about 25 recognised families . They are characterised by having chelae microscleres, that is, the minute spicules scattered through the tissues, usually in the 10-60 μm range, have a shovel-like structure on the end.
Leptomitus is a genus of demosponge known from the Middle Cambrian Burgess Shale. [4] Its name is derived from the Greek lept ("slender") and mitos ("thread"), referring to the overall shape of the sponge. 138 specimens of Leptomitus are known from the Greater Phyllopod bed, where they comprise 0.26% of the community.
Though Punxsutawney Phil is the original and most famous groundhog to predict the weather come Groundhog Day, there are actually quite a few across the country. Move Over, Punxsutawney Phil! Meet ...
Cliona viridis, commonly called the green boring sponge, is a species of demosponge in the family Clionaidae. Its form varies according to the nature of the surface on which it grows. In limestone and other calcareous substrates it excavates channels and chambers while on other types of rock it encrusts the surface or forms massive structures.
The first rule of The Elf on the Shelf is that you can't touch the elf. The second rule of The Elf on the Shelf is that the elf will not speak or move while you are awake.