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Cyrtograptus, graptoliteColony of the graptolite Cyrtograptus from the Silurian of Bohemia. Field of view 5 cm wide
Didymograptus, fossil graptoliteThe two tuning-fork graptolite on this piece of Welsh Ordovician shale belong to the genus Didymograptus and have branches some some 5 cm in length with sawtooth-like thecae
Didymograptus murchisoni, graptoliteThis is an Ordovician tuning-fork shaped graptolite from Wales. Graptolites are an extict group of marine, colonial animals
Monograptus, graptoliteShown here is Monograptus, a slender and delicate Silurian graptolite. Graptolites are the fossil remains of small colonial animals. Graptolite colonies were connected together by living tissue
Dictyonema retiforme, grapoliteFossil grapolite from the Early Silurian (425 million years old), Ontario, Canada. On display in the From the Beginning, Gallery 63, Earth Galleries at the Natural History Museum, London
Dictyonema flabelliforme, gaptoliteShown here is an Ordovician dendroid graptolite, specimen originates from North Wales. Graptolites are the fossil remains of small colonial marine animals
Didymograptus, graptoliteDidymograptus, Ordovician tuning-fork planktonic graptolites. Graptolites are an extinct group of marine, colonial animals
Dictyonema, graptoliteShown here is Dictyonema, a Cambrian dendroid graptolite. Graptolites are the fossil remains of small colonial animals. Graptolite colonies were connected together by living tissue