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An individual chiton may have thousands of such ocelli. [18] These aragonite-based eyes [23] make them capable of true vision, [24] though research continues as to the extent of their visual acuity. It is known that they can differentiate between a predator's shadow and changes in light caused by clouds.
Aesthetes are organs in chitons, derived from the mantle of the organism. They are generally believed to be tiny 'eyes', too small to be seen unaided, embedded in the organism's shell, [1] acting in unison to function as a large, dispersed, compound eye. [2]
The valves are thick and heavy. The morphology of the West Indian Fuzzy Chiton contains a fifth valve, split into two symmetrical half valves that are independent to each other and other valves. A griddle-like tissue splits the valves. [3] This specific type of chiton displays hundreds of shell eyes (< 100 μm) embedded in their dorsal shell.
Adults are the largest chitons native to New Zealand at up to 110mm long, are oval shaped and surrounded by a leathery girdle covered in short bristles. Colouring varies from dark brown to olive-green, with the valves often encrusted or eroded, numerous shell eyes dotting the surfaces.
Chiton body fluid is isosmotic with sea water, implying no osmotic regulation. [9] Like other chitons, A. zelandica has no eyes, instead relying on simple sensory structures in the girdle and photosensory organs known as aesthetes in the shell. [10]
Cyanoplax keepiana, also known as Keep's chiton, is a species of chiton native to the Pacific coast of North America. [1] According to the Cabrillo Marine Aquarium in San Pedro , Keep's chiton has "brilliant blue markings on its plates that can only be appreciated with a hand lens". [ 2 ]
Yellow eyes have become inherently associated with alligators, but eye color may vary depending on age. For example, juvenile alligators often exhibit a reddish reflection, while adults display ...
Acanthochitonidae chitons are found in a variety of marine habitats, including rocky intertidal zones, coral reefs, and seagrass beds. They are also found in deep sea environments, with some species occurring as deep as 3,000 meters. Acanthochitonidae chitons are known to be active grazers, feeding primarily on algae and detritus.