Genus
Haplacanthus Agassiz, 1845
Aiheeseen liittyvät julkaisut
Pinakhina, D. V. 2018. Srednedevonskie akantodovye ryby  (Acanthodii) Severo-Zapadnogo subregiona Vostočno-Evropejskoi Platformy. pp. 1-381.  St. Peterburg State University. 
Lyarskaya, L. A. 1978. Rezeknenskaâ svita i eë vozrastnye analogi [Резекненская свита и её возрастные аналоги].  Stratigraphy of the Baltic Phanerozoic, pp. 22-39.   Zinatne. 
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.
List of species
1. Haplacanthus ehrmanensis Gross, 1942 | Gauja Stage
2. Haplacanthus ludziensis Lyarskaya, 1978 | Rezekne Stage
4. Haplacanthus perseensis Gross, 1942 | Plavinas Stage
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Luokittelu
| Organism group | Biota | 
| Kingdom | Animalia | 
| Phylum | Chordata | 
| Subphylum | Vertebrata | 
| Infraphylum | Gnathostomata | 
| Class | Acanthodii | 
| Order | Acanthodiformes | 
| Climatiiformes | |
| Ischnacanthiformes | |
| Tchunacanthida | |
| Family | Euthacanthidae | 
| Machaeracanthidae | |
| Genus | Archaeacanthus | 
| Canadalepis | |
| Endemolepis | |
| Haplacanthus | |
| Species | ehrmanensis | 
| ludziensis | |
| marginalis | |
| perseensis | |
| Genus | Homacanthus | 
| Laliacanthus | |
| Latviacanthus | |
| Minioracanthus | |
| Nodocosta | |
| Nostolepis | |
| Onchus |