Both species have similar body morphology, in that both resembledtadpoles with forked tails. Scale morphology differs in thatA. bifurcata has forked scales with two prong-like spires,[1] and thatA. turbinata has bulbous, pointed scales that resemble upside-downspinning tops.[3]
The scales ofArchipelepis are robust and abrasion-resistant, similar to modern sharks which live among rough substrates such as rocky caves or reefs.[4][5]
^abMärss, Tiiu, VH Wilson, Mark, & Thorsteinsson, Raymond. "New thelodont (Agnatha) and possible chondrichthyan (Gnathostomata) taxa established in the Silurian and Lower Devonian of theCanadian Arctic Archipelago."Proceedings of the Estonian Academy of Sciences, Geology. Vol. 51. No. 2. Estonian Academy Publishers, 2002.
^Wilson, Mark VH, and Tiiu Märss. "Thelodont phylogeny revisited, with inclusion of key scale-based taxa." Estonian Journal of Earth Sciences 58.4 (2009): 297œ310.[1]
^abSoehn, K. L., Märss, T., Caldwell, M. W. & Wilson, M. V. H., 2001: New and biostratigraphically useful thelodonts from theSilurian of theMackenzie Mountains, Northwest Territories, Canada. Journal of Vertebrate Paleontology, 21: 651-659[2]