Species
Heisograptus difficilis Tsegelnjuk, 1976
Synonyymit
1976 Heisograptus difficilis Tsegelnjuk, sp. nov. — Tsegelnjuk , pp. 104, fig. 30:3,4
Luokittelu
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Hemichordata |
| Class | Pterobranchia |
| Subclass | Graptolithina |
| Order | Graptoloidea |
| Suborder | Axonophora |
| Family | Monograptidae |
| Genus | Heisograptus |
| Species | difficilis |
| micropoma |