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Name:
Leptomitus bellilineata
Age: Cambrian
Formation: Marjum Formation
Location: Millard County, Utah
Size: Sponge is 3.1 inches long
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Here is a rare invertebrate fossil. It is a very large Leptomitus bellilineata sponge from Utah. This genus of sponge is also found in the Burgess Shale fauna, and is pictured on page 74 of the Smithsonian's "Fossils of the Burgess Shale" book. Leptomitus was a very elongate, tubular sponge. It was the earliest known demosponge, and appears to be the ancestor to many other types of Middle Cambrian sponges. This specimen has great detail - the structure of the walls is even preserved. The sponge has nice orangish-red coloration and contrasts well with the pinkish matrix. This is a very collectible fossil sponge from the Middle Cambrian.
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