Genus
Hormograptus Öpik, 1930
Selection of related publications
Vinn, O., Ernst, A., Wilson, M. A., Toom, U. 2019. Symbiosis of conulariids with trepostome bryozoans in the Upper Ordovician of Estonia (Baltica). Palaeogeography, Palaeoclimatology, Palaeoecology 518, 89-96. DOI:10.1016/j.palaeo.2019.01.018
Obut, A. M. 1960. Correlation of some parts of Estonian Ordovician and Silurian deposits according to graptolites. ENSV TA Geoloogia Instituudi Uurimused V, 143-157.
Obut, A., Rytzk, G. 1958. Ordovician and Silurian Dendroidea of Estonia. ENSV TA Geoloogia Instituudi Uurimused III, 125-143.
Öpik, A. 1930. Beiträge zur Kenntnis der Kukruse-(C2-C3-)Stufe in Eesti. IV. Tartu Ülikooli Geoloogia Instituudi Toimetused 24, 1-34.
Öpik, A. 1928. Beiträge zur Kenntnis der Kukruse-(C2-C3-) Stufe in Eesti. III. Tartu Ülikooli Geoloogia Instituudi Toimetused 12, 1-42.
List of species
1. Hormograptus cervus (Obut et Rytzk, 1958) | Vormsi Stage
2. Hormograptus defensor (Öpik, 1928) | Kukruse Stage
3. Hormograptus densitubularis (Obut, 1960) | Porkuni Stage
5. Hormograptus ramulus (Öpik, 1928) | Kukruse Stage
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Classification
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Hemichordata |
| Class | Pterobranchia |
| Subclass | Graptolithina |
| Family | Wimanicrustidae |
| Supergenus | Urbanekicrusta |
| Genus | Bulmanicrusta |
| Ellesicrusta | |
| Graptoblastoides | |
| Graptoblastus | |
| Holmicrusta | |
| Hormograptus | |
| Species | cervus |
| defensor | |
| densitubularis | |
| luhai | |
| ramulus | |
| Genus | Lapworthicrusta |
| Maenniligraptus | |
| Ruedemannicrusta | |
| Thallograptus | |
| Wimanicrusta | |
| Xenocyathus |