Cryptic diversity in coastal Australasia: a morphological and mitonuclear genetic analysis of habitat-forming sibling species Rius, Marc Teske, Peter R. Zoological Journal of the Linnean Society 2013 2013-07-08 168 3 597 611 4QY8Q Rius & Teske, 2013 Rius & Teske 2013 [254,543,262,283] Ascidiacea Pyuridae Pyura Animalia Stolidobranchia 8 611 Chordata species doppelgangera sp. nov.   Heller (1878)described two similar species:  Cynthia stoloniferafrom South Africaand  C. praeputialisfrom Australia, which were later both considered to be of the genus  Pyura( Millar, 1966). Subsequently, Monniot & Bitar (1983)compared specimens from Morocco, Chile, and Australia. The first one corresponded to  P. herdmani, but the other two were  P. praeputialis, as is evident from the characteristic shape of  P. praeputialis’ digestive track with a secondary gut loop that curves sharply, something that is not found in  P. doppelgangera. As previous taxonomists have described in detail specimens of the large form (  P. praeputialis), we considered it appropriate to describe the small form as  P. doppelgangera.