Species
Isograptus gibberulus (Nicholson, 1875)
Synonymy list
1875 Didymograpsus gibberulus — Nicholson , pp. 271, fig. 7:3-3b
1892 non Isograptus gibberulus Nicholson sp. — Moberg , pp. 346, fig. 8:3-7
2011 Isograptus gibberulus (Nicholson, 1875) — Maletz , pp. 275, fig. 4B
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 |