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Expansograptus

EXPANSOGRAPTUS
These were small to large graptolites with approximately twenty to several hundred thecae. Two stipes diverge from the initial sicula, which is distinguished by its dorsally projecting nema (an extension of the initial sicla) at the point where the two stipes converge. The thecae are usually of a relatively simple type, tubular or with a small apertural lip. The different species are distinguished by the number of thecae per centimeter, and by the width and shape of the stipes. Habitat: Expansograptus floated in the open sea.
© 1992 Cyril Walker, David Ward .