Tapeworm Eggs in a 270 Million-Year-Old Shark Coprolite Dentzien-Dias, Paula C. ; Poinar, George ; de Figueiredo, Ana Emilia Q. ; Pacheco, Ana Carolina L. ; Horn, Bruno L. D. ; Schultz, Cesar L. Abstract Publication: PLoS ONE Pub Date: January 2013 DOI: 10.1371/journal.pone.0055007 Bibcode: 2013PLoSO...855007D