Species
Propora exigua (Billings, 1865)
Synonymy list
1865     Heliolites exiguus sp. n.  — Billings , pp. 428, fig. 31:14
1990     Propora conferta var minima Lindström, 1899  — Young & Noble , pp. 191
1990     Propora exigua (Billings, 1865) — Young & Noble , pp. 191-193, fig. 2, 5.6-5.11, 6.1
Selection of related publications
Mõtus, M.-A., Hints, O. (eds) 2007. 10th International Symposium on Fossil Cnidaria and Porifera. Excursion B2: Lower Paleozoic geology and corals of Estonia. Excursion Guidebook. pp. 1-64.  Institute of Geology at Tallinn University of Technology. 
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Classification
| Organism group | Biota | 
| Kingdom | Animalia | 
| Phylum | Cnidaria | 
| Subphylum | Anthozoa | 
| Subclass | Tabulata | 
| Superorder | Heliolitoidea | 
| Suborder | Heliolitina | 
| Superfamily | Proporicae | 
| Family | Proporidae | 
| Genus | Propora | 
| Species | affinis | 
| askerensis | |
| bacillifera | |
| conferta | |
| euryacantha | |
| exigua | |
| magna | |
| raricellata | |
| reticulata | |
| speciosa | |
| tubulata | 
References based on distribution
- Mõtus & Hints, O. 2007 (eds) Päri quarry Llandovery