Species
Ischnacanthus gracilis (Egerton, 1861)
Synonymy list
1861     Diplacanthus gracilis — Egerton , pp. 69-71, fig. pl. 9
1864     Ischnacanthus gracilis — Powrie , pp. 419-420
1870     Diplacanthus gracilis, Eg. — Powrie , pp. 287, 289, 290, fig. pl. 10, fig. 2
1947     Ischnacanthus gracilis (Egerton) — Gross , pp. 124
2018     Ischnacanthus gracilis (Egerton, 1861) — Burrow et al. , pp. 341, fig. Text-figs 1–13
Classification
| Organism group | Biota | 
| Kingdom | Animalia | 
| Phylum | Chordata | 
| Subphylum | Vertebrata | 
| Infraphylum | Gnathostomata | 
| Class | Acanthodii | 
| Order | Ischnacanthiformes | 
| Family | Ischnacanthidae | 
| Genus | Ischnacanthus | 
| Species | gracilis |