Family
Ptilograptidae Hopkinson, 1875
Aiheeseen liittyvät julkaisut
Obut, A., Rytzk, G. 1958. Ordovician and Silurian Dendroidea of Estonia. ENSV TA Geoloogia Instituudi Uurimused III, 125-143.
List of species
1. Ptilograptus pennatus Obut et Rytsk, 1958 | Pirgu Stage
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Luokittelu
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Hemichordata |
| Class | Pterobranchia |
| Subclass | Graptolithina |
| Order | Dendroidea |
| Family | Acanthograptidae |
| Dendrograptidae | |
| Polygonograptidae | |
| Ptilograptidae | |
| Genus | Ptilograptus |