Genus
Cardiograptus Harris & Keble, 1916
Luokittelu
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Hemichordata |
| Class | Pterobranchia |
| Subclass | Graptolithina |
| Order | Graptoloidea |
| Suborder | Glossograptina |
| Family | Isograptidae |
| Subfamily | Arienigraptinae |
| Isograptinae | |
| Genus | Cardiograptus |
| Oncograptus | |
| Parisograptus | |
| Proncograptus | |
| unranked | Procardiograptus |