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RETIOLITES

RETIOLITES The thecae of Retiolites are arranged in two series lying back to back, forming a single stipe, which gradually expands in width away from the proximal end. The organic-walled skeleton of Retiolites had a characteristic open network which presumably made it lighter than water. Habitat: Retiolites probably had a free-floating existance. Remark: Free-floating graptolites, such as Retiolites, make good zonal fossils. © 1992 Cyril Walker, David Ward .