Παράζωα: Διαφορά μεταξύ των αναθεωρήσεων

Ο διαχωρισμός Παραζώων-Ευμεταζώων υπολογίζεται ότι έγινε 940 εκατομμύρια χρόνια πριν.<ref name="pmid9211740">{{cite journal |author=Nikoh N, Iwabe N, Kuma K, ''et al'' |title=An estimate of divergence time of Parazoa and Eumetazoa and that of Cephalochordata and Vertebrata by aldolase and triose phosphate isomerase clocks |journal=J. Mol. Evol. |volume=45 |issue=1 |pages=97–106 |year=1997 |month=July |pmid=9211740 |doi= 10.1007/PL00006208 |url=http://link.springer-ny.com/link/service/journals/00239/bibs/45n1p97.html |accessdate=31-07-2013 |date= |archiveurl=https://web.archive.org/web/20000915232035/http://link.springer-ny.com/link/service/journals/00239/bibs/45n1p97.html |archivedate=2000-09-15 |url-status=dead }}</ref>

Η ομάδα των παραζώων θεωρείται πλέον παραφυλετική<ref name="urlPARAZOA TAXONOMY">{{cite web |url=http://comenius.susqu.edu/bi/202/Animals/PARAZOA/default.htm |title=PARAZOA TAXONOMY |format= |work= |accessdate=31-07-2013 |archiveurl=https://web.archive.org/web/20110720053827/http://comenius.susqu.edu/bi/202/Animals/PARAZOA/default.htm |archivedate=2011-07-20 |url-status=dead }}</ref>.