Facebook Fossiel.net In English Please In het Nederlands


Come to our PaleoTime-NL International Fossil Show in Harderwijk (NL), on March 9th 2019!

Contribute knowledge and information to Fossiel.net!
How can I help?

Most Popular Articles

D08 Box middle high black
0.65 EUR


The expression aff. is used in scientific nomenclature to indicate a potential relation of a new species with a known species. In other words, it kan be read as 'resembling...'.

For example, a trilobite described by Morzadec as 'Heliopyge aff. helios' indicates that it is a Heliopyge that closely resembles H. helios, but might nonetheless be a different species.

Do you have additional information for this article? Please contact the Fossiel.net Team.