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...rdLife International | title = ''Cygnus olor'' | journal = [[IUCN Red List of Threatened Species]] | volume= 2012 | page = e.T22679839A40128183 | publish ...987 |title=Wildfowl: An Identification Guide to the Ducks, Geese and Swans of the World |publisher=A & C Black |isbn=0-7470-2201-1}}</ref> Measuring {{co

| image_caption = A drawing of ''Trinodus tardus'' ...& Corda, 1847 (Agnostida) in the Prague Basin revisited|journal= Bulletin of Geosciences|volume= 86|issue= 4|pages= 707–724|doi= 10.3140/bull.geosci.1

...to the fused eyes, common to the species of this genus. Some (sub)species of the cyclopygid genera [[Cyclopyge (trilobite)|''Cyclopyge'']] and ''[[Pricy ''Symphysops'' is the combination of the Ancient Greek σύν (syn) "together", φύσις (physis) "growth" and