User:Abyssal/Portal:Cambrian/Selected picture/5

Various species of Cambrian sponge-like animals, known as Archaeocyathans. Counterclockwise, from the upper left corner, Coscinoptycta zunyiensis, Kotuyicyathus debilis, Tumuliolynthus musatovi, Beltanacyathus digitus, Fransuasaecyathus novus, Orbicyathus mongolicus, Center, Paranacyathus subartus.
Photo credit: Stanton F. Fink