Species
Grewingkia rusticum (Billings, 1858)
Synonymy list
1858     Petraia  rustica  — Billings , pp. 422
1865     Zaphrentis rustica — Billings , pp. 106
1889     Streptelasma rusticum — Miller , pp. 205
1915     Streptelasma rusticum — Bassler , pp. 1204
1937     Streptelasma rusticum (Billings) — Cox , pp. 11, fig. 2:11, 12a-c; 13a-d
1961     Streptelasma (Streptelasma) rusticum (Billings) — Kaljo , pp. 51, fig. 2:1
1963     Streptelasma rusticum (Billings) — Stumm , pp. 26, fig. Pl II, text fig. 1-3, 8-10
1981     Grewingkia rustica (Billings, 1858) — Elias , pp. 11
Selection of related publications
Kaljo, D. L. 1961. Some additional data on the study of Ordovician streptelasmids in Estonia.  ENSV TA Geoloogia Instituudi Uurimused   VI,      51-67.
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Classification
| Organism group | Biota | 
| Kingdom | Animalia | 
| Phylum | Cnidaria | 
| Subphylum | Anthozoa | 
| Subclass | Rugosa | 
| Order | Stauriida | 
| Suborder | Streptelasmatina | 
| Family | Streptelasmatidae | 
| Subfamily | Streptelasmatinae | 
| Genus | Grewingkia | 
| Species | buceros | 
| contexta | |
| europaeum | |
| kiaeri | |
| robustum | |
| rusticum | 
References based on distribution
- Kaljo, 1961a Salutaguse quarry Pirgu Stage
- Kaljo, 1961a Pahkla, Raplamaa Pirgu Stage