Stefen, Clara http://orcid.org/0000-0001-7986-110X
Article History
Received: 19 April 2018
Accepted: 8 November 2018
First Online: 4 March 2019
Compliance with ethical standards
: The research did not involve humans or recent animals. All information concerning the fossil material is given in the text.
: The author declares that she has no conflicts of interest