Genus
Haplacanthus Agassiz, 1845
Selection of related publications
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. 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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Klassificering
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Chordata |
| Subphylum | Vertebrata |
| Organism group | Gnathostomata |
| Class | Acanthodii |
| Order | Acanthodiformes |
| Climatiiformes | |
| Ischnacanthiformes | |
| Tchunacanthida | |
| Family | Machaeracanthidae |
| Genus | Archaeacanthus |
| Canadalepis | |
| Endemolepis | |
| Haplacanthus | |
| Species | ehrmanensis |
| ludziensis | |
| marginalis | |
| perseensis | |
| Genus | Homacanthus |
| Laliacanthus | |
| Latviacanthus | |
| Minioracanthus | |
| Nodocosta | |
| Nostolepis | |
| Onchus |