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Tetragraptus
Ordovician
(Left and above) Didymograptus, an Ordovician graptolite, recognisable for having two stipes.
Silurian
(Above) Graptolites evolved to have fewer stipes.
(Above) A pyritised rod of Monograptus, a single-stiped graptolite from the Silurian.
Leptograptus
Didymograptus
Dicellograptus
Climacograptus
Monograptus
(Below) Films of Monograptus.
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