Tetragraptus approximatus

Tetragraptus approximatus
Temporal range: Floian
Illustration of Tetragraptus approximatus
Original illustrations of Tetragraptus approximatus by Nicholson (1873). At the top is a magnified section of the stipes. A complete specimen is illustrated below.
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Hemichordata
Class: Pterobranchia
Order: Graptoloidea
Family: Dichograptidae
Genus: Tetragraptus
Species:
T. approximatus
Binomial name
Tetragraptus approximatus
Nicholson, 1873

Tetragraptus approximatus is a species of dichograptid graptolite belonging to the genus Tetragraptus. It existed during the Floian Age (477.7 million years ago) of the Ordovician. It is an important index fossil in biostratigraphy.