The draughtsboard shark closely resembles the blotchy swellshark (C. umbratile) and the Australian swellshark (C. laticeps), both of which have been suspected to be the same species as C. isabellum by different authors at various times.
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French naturalist Pierre Joseph Bonnaterre originally described the draughtsboard shark as Squalus isabella, in the 1788 ichthyology volume of the Tableau encyclopédique et méthodique des trois règnes de la nature.
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Because its population seems healthy and free from significant threats, the International Union for Conservation of Nature (IUCN) has assessed this species as of Least Concern.
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