The colourful world of the mantis shrimp: The colour-vision system of these crustaceans includes four types of UV photoreceptor

Article Abstract:

Electrophysiological methods were used to examine the vision of the mantis shrimp, Neogonodactylus oerstedii. The shrimp was found to have at least four types of photoreceptor for ultraviolet light situated in R8 cells in the eye. The photoreceptors are sensitive to light wavelengths of 315, 330, 340, and 380 nm, suggesting that the shrimp's colour-vision system may be unique.

Observations, Vision research

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Motor control of flexible octopus arms

Article Abstract:

Octopuses use their arms to reach a target by generating a stereotypical movement in which only three degrees of freedom are controlled and once the object is grasped, the animal executes a point-to-point movement to transfer the target to the mouth. This action of bringing the end-effector to the mouth resembles the execution of motor tasks by articulated arms.

Octopi, Evaluation, Behavior, Animal behavior, Octopus, Octopuses, Animal behaviour

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Deadly strike mechanism of a mantis shrimp

Article Abstract:

It is proved that the peacock mantis shrimp generates an extremely fast strike that requires major energy storage and release. These extreme movements can be explained in terms of a saddle-shaped exoskeletal spring mechanism.

Shrimp

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