![](http://www.alamy.com/thumbs/6/BBE3E89F-3C80-44D1-878B-780BCD28F0BF/F01WAJ.jpg)
Fossils - Porifera - Demospongiae - Hexactinellida - Siphonia - Cretaceous.
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Photo credit: © De Agostini / G. Cigolini / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: background, black, calcareous, close-, demospongiae, extinct, fossil, fossils, geology, history, image, object, paleontology, people, porifera, rock, shot, single, siphonia, sponge, square, studio