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The mechanisms of osmoregulation is different for sharks (and other elasmobranch fishes) and teleost fishes. In Elasmobranchs the body osmolarity is maintained equal to the seawater by Na⁺ Cl⁻ and urea. Toxicity because of high concentrations of urea (strong chaotrope) is counteracted by high levels of trimethylamine oxide (TMAO). So, the elasmobranchs do ...

According to the Marine Species Identification portal, the presence of these thorns is variable. They also vary in size, shape, and the presence of polygonal frames. I don't think there is anything about the imaging process described that would result in the uniform loss of spines (unless the sieve/microsplitter broke them all, but I think that would be a ...