Species
Haplacanthus marginalis Agassiz, 1845
Synonymy list
1998     Haplacanthus marginalis Agassiz  — Valiukevičius , pp. 7
2002     Haplacanthus marginalis — Valiukevičius , pp. 36
2006     Haplacanthus marginalis — Valiukevičius , fig. 331
Selection of related publications
Lyarskaya, L. A. 1975. New data on acanthodii of the Middle Devonian of the Baltic.  The Fauna and Stratigraphy of Paleozoic and Mesozoic of Baltic and Byelorussia, pp. 227-232.   Mintis. 
Gross,  W. 1940. Acanthodier und Placodermen aus den Heterostius-Schichten Estlands und Lettlands.  Tartu Ülikooli juures oleva Loodusuurijate Seltsi Aruanded   46,      12-99.
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Classification
| Organism group | Biota | 
| Kingdom | Animalia | 
| Phylum | Chordata | 
| Subphylum | Vertebrata | 
| Infraphylum | Gnathostomata | 
| Class | Acanthodii | 
| Genus | Haplacanthus | 
| Species | ehrmanensis | 
| ludziensis | |
| marginalis | |
| perseensis | 
References based on distribution
- Lyarskaya, 1975 Tamme cliff Aruküla Stage
- Lyarskaya, 1975 Kallaste cliff, Tartumaa Aruküla Stage