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Hatchlings of the giant Pacific octopus (Enteroctopus dofleini)—one of the two largest octopus species—weigh 0.0253 g (0.00089 oz) on average. [ 30 ] At the other extreme are nautiluses , which upon hatching typically have a shell diameter of 25 mm (1 in) or more (depending on the species), the largest hatchling size among extant ...
Ammocoetes can grow from 3–4 inches (8–10 centimetres) to about 8 inches (20 cm). [ 53 ] [ 54 ] Many species change color during a diurnal cycle , becoming dark at day and pale at night. [ 55 ] The skin also has photoreceptors , light sensitive cells, most of them concentrated in the tail, which helps them to stay buried. [ 56 ]