The genus Discoceras (Tarphyceratida, Cephalopoda; Ordovician) from Estonia and glacial erratics in north-central Europe Author Aubrechtová, Martina Institute of Geology, Czech Academy of Sciences, Rozvojová 269, Prague, 16500, Czech Republic. & University of Tartu, Faculty of Science and Technology, Institute of Ecology and Earth Sciences, Department of Geology, Ravila 14 a, 50411 Tartu, Estonia. aubrechm@gmail.com Author Korn, Dieter Museum für Naturkunde, Leibniz-Institut für Evolutions-und Biodiversitätsforschung, Invalidenstrasse 43, 10115 Berlin, Germany. dieter.korn@mfn.berlin Author Kröger, Björn Finnish Museum of Natural History, University of Helsinki, P. O. Box 44, Fi- 00014, Finland. bjorn.kroger@helsinki.fi text European Journal of Taxonomy 2026 2026-01-29 1036 1 54 https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3173/14109 journal article 314311 10.5852/ejt.2026.1036.3173 58eef89e-653a-483e-8d9e-1ac617c7d923 2118-9773 18479586 0784B061-33CD-498B-B6D6-5CA4CF5BC2E4

Table 13. Conch measurements, ratios and rates of Discoceras circulare sp. nov.

specimen	dm	ww	wh	uw	ah	CWI	WWI	UWI	WER	IZR
MB.C.32325	104.8	33.1	34.0	43.9	34.0	0.32	0.97	0.42	2.19	0.00
GIT 426-145	98.3	33.3	32.4	40.3		0.34	1.03	0.41	–	–
minus 90°	82.6	28.0	28.7	33.6	26.0	0.34	0.97	0.41	2.13	0.10
minus 180°	65.9	24.5	25.6	–	–	0.37	0.96	–	–	–
minus 270°	52.7	20.2	20.3	19.7	–	0.38	1.00	0.37	–	–
minus 450°	33.6	15.4	14.2	9.4	13.6	0.46	1.09	0.28	2.83	0.04