Family
Polyplacognathidae Bergström, 1981
Selection of related publications
Paiste, T., Männik, P., Meidla, T. 2022. Sandbian (Late Ordovician) conodonts in Estonia: distribution and biostratigraphy. GFF 1-15. DOI:10.1080/11035897.2021.2020333
Männik, P., Viira, V. 2012. Ordovician conodont diversity in the northern Baltic. Estonian Journal of Earth Sciences 61, 1, 1-14. Estonian Academy Publishers. DOI:10.3176/earth.2012.1.01
Hints, O., Viira, V., Nõlvak, J. 2012. Darriwilian (Middle Ordovician) conodont biostratigraphy in NW Estonia. Estonian Journal of Earth Sciences 61, 4, 210-226. DOI:10.3176/earth.2012.4.03
Viira, V. 2011. Lower and Middle Ordovician conodonts from subsurface of SE Estonia and adjacent Russia. Estonian Journal of Earth Sciences 60, 1, 1-21. DOI:10.3176/earth.2011.1.01
Sjöstrand, L. L. M. 2003. Early to early Middle Ordovician conodont biostratigraphy of the Tamsalu drill core, central Estonia. Examensarbeite i geologi vid Lunds Universitet 156, 1-20. Lunds Universitet.
Viira, V., Löfgren, A., Mägi, S., Wickström, J. 2001. An Early to Middle Ordovician succession of conodont faunas at Mäekalda, northern Estonia. Geological Magazine 138, 6, 699-718. DOI:10.1017/S0016756801005945
Männik, P., Viira, V. 1990. Conodonts. Field Meeting Estonia 1990. An Excursion Guidebook. Eds: Kaljo, D. & Nestor, H., pp. 84-90. Estonian Academy of Sciences.
Löfgren, A. 1978. Arenigian and Llanvirnian cocodonts from Jämtland, northern Sweden. Fossils and Strata 13, 1-129.
Viira, V. 1972. On Symmetry of Some Middle Ordovician Conodonts. Geologica et Palaeontologica 6, 45-49.
Viira, V. 1967. Ordovician conodont succession in the Ohesaare core. Eesti NSV Teaduste Akadeemia Toimetised. Keemia, Geoloogia / Известия Академии наук Эстонской ССР. Химия. Геология 16, 4, 319-329. DOI:10.3176/chem.geol.1967.4.06
Fåhraeus, L. E. 1966. Lower Viruan (Middle Ordovician) conodonts from the Gullhögen quarry, southern central Sweden. Sveriges Geologiska Undersökning 610, 1-40.
List of species
1. Baltoplacognathus reclinatus (Fåhraeus, 1966) | Lasnamägi Stage
2. Baltoplacognathus robustus (Bergström, 1971) | Uhaku Stage
3. Eoplacognathus elongatus (Bergström, 1962) | Kukruse Stage
4. Eoplacognathus lindstroemi (Hamar, 1964) | Uhaku Stage
5. Eoplacognathus pseudoplanus (Viira, 1972) | Kunda Stage
6. Eoplacognathus suecicus Bergström, 1971 | Aseri Stage
7. Yangtzeplacognathus crassus (Chen et Zhang, 1993) | Middle Ordovician
8. Yangtzeplacognathus foliaceus (Fåhraeus, 1966) | Lasnamägi Stage
9. Yangtzeplacognathus protoramosus (Chen et al., 1983) | Uhaku Stage
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Classification