Species
Isograptus spjeldnaesi Maletz, 2011
Synonymy list
1973 pars Isograptus victoriae lunatus Harris — Cooper , pp. 59, fig. text fig. 8c,i-k
1988 pars Isograptus victoriae lunatus Harris — William & Stevens , pp. 64, fig. text-figs 57 G, I, J
2011 Isograptus spjeldnaesi n. sp. — Maletz , pp. 273, fig. 6a-j
Classification
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Hemichordata |
| Class | Pterobranchia |
| Subclass | Graptolithina |
| Order | Graptoloidea |
| Suborder | Glossograptina |
| Family | Isograptidae |
| Subfamily | Isograptinae |
| Genus | Isograptus |
| Species | gibberulus |
| mobergi | |
| rigidus | |
| spjeldnaesi |