Phyllograptus is a graptolite genus of the order Graptoloidea, in the family Tetragraptidae.
Fossils of this genus have been found in the Early Ordovician (475-473 million years ago), in the sediments of Australia, Bolivia, Canada, Chile, China, New Zealand, Norway, Spain, Sweden, the United Kingdom and United States.
The normal length of a colony of these leaf-shaped animals could reach a length of . They were passively mobile planktonic suspension feeders.Fossil Museum
Phyllograptus species are excellent index fossils or guide fossils for identifying Ordovician rocks.Encyclopædia Britannica
Species Phyllograptus angustifolius Phyllograptus anna Phyllograptus densus Phyllograptus glossograptoides Phyllograptus rotundatus Fossil ID
References
Cyril Walker & David Ward (1993) - Fossielen: Sesam Natuur Handboeken, Bosch & Keuning, Baarn.