Species
Haplacanthus ludziensis Lyarskaya, 1978
Synonymy list
1978     Haplacanthus ludziensis Lyarskaya sp. nov. — Lyarskaya , pp. 37, fig. 9
1998     Haplacanthus ludziensis Lyarskaya — Valiukevičius , pp. 7
2006     Haplacanthus ludziensis — Valiukevičius , pp. 330
Selection of related publications
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. 
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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, 1978b Ludza 15 borehole 430.8 - 430.8 Rezekne Stage