Species
Haplistion Young et Young, 1877
Selection of related publications
Märss, T., Wilson, M. V. H., Thorsteinsson, R. 2002. New thelodont (Agnatha) and possible chondrichthyan (Gnathostomata) taxa established in the Silurian and Lower Devonian of the Canadian Arctic Archipelago.  Proceedings of the Estonian Academy of Sciences. Geology   51,   2,   88-120. DOI:10.3176/geol.2002.2.02
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Classification
| Organism group | Biota | 
| Kingdom | Animalia | 
| Phylum | Porifera | 
| Class | Demospongea | 
| Order | Spirosclerophorida | 
| Suborder | Rhizomorina | 
| Family | Haplistiidae | 
| Species | Haplistion | 
| Genus | cylindricum | 
| Species | minutum | 
| toftanum |