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There are two subspecies that differentiate in body length. The northern subspecies lives in colder water, matures at 3 cm (1.2 in) and can reach a size of 7–8.5 cm (2.8–3.3 in). This makes it by far the largest sea angel. In comparison, the size of the southern subspecies is 1.2 cm (0.5 in), C. elegantissima is up to 3 cm (1.2 in), C. okhotensis up to 0.8 cm (0.3 in), and C. antarctica up to 3 cm (1.2 in). The neurobiology of this pteropod has been studied in detail.
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