Structural organization and epithelial cell types of the intestinal diverticula (protopancreas) of ammocoetes of southern hemisphere lampreys: functional and phylogenetic implicationsHelmut Bartels; Ian C. Potter · 1995

Changes in the cellular composition of the gill epithelium during the life cycle of a nonparasitic lamprey: functional and evolutionary implicationsBartels, Helmut; Fazekas, Ursula; Youson, John H.; Potter, Ian C. · Canadian Journal of Zoology · 2011

Functional and evolutionary implications of the cellular composition of the gill epithelium of feeding adults of a freshwater parasitic species of lamprey, <i>Ichthyomyzon unicuspis</i>Bartels, Helmut; Docker, Margaret F.; Fazekas, Ursula; Potter, Ian C. · Canadian Journal of Zoology · 2012