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The Priacanthidae, the bigeyes, are a family of 18 species of marine ray-finned fishes."Catalufa" is an alternate common name for some members of the Priacanthidae.The etymology of the scientific name (prioo-, to bite + akantha, thorn) refers to the family's very rough, spined scales.
The eyes are positioned on the top of the head, and the fish floats at the water surface with only the lower half of each eye underwater. The two halves are divided by a band of tissue and the eye has two pupils, connected by part of the iris. The upper half of the eye is adapted for vision in air, the lower half for vision in water. [35]
Amongst jawless fish, the lamprey has well-developed eyes, while the hagfish has only primitive eyespots. [6] Fish vision shows adaptation to their visual environment, for example deep sea fishes have eyes suited to the dark environment. Fish and other aquatic animals live in a different light environment than terrestrial species.
They were searching for unfamiliar-looking sea creatures. And they found one in the form of a new species with about 170 eyes.
Scallops have up to 100 simple eyes. The molluscs have the widest variety of eye morphologies of any phylum, [1] and a large degree of variation in their function. Cephalopods such as octopus, squid, and cuttlefish have eyes as complex as those of vertebrates, while scallops have up to 100 simple eyes.
Cephalopods, as active marine predators, possess sensory organs specialized for use in aquatic conditions. [1] They have a camera-type eye which consists of an iris, a circular lens, vitreous cavity (eye gel), pigment cells, and photoreceptor cells that translate light from the light-sensitive retina into nerve signals which travel along the optic nerve to the brain. [2]
The Atlantic bigeye is a small to medium sized perciform fish. Almost all parts of the fish are entirely reddish-orange, including the eyes. The dorsal fin has 10 spines, and 14 rays. The anal fin has 3 spines and 15 rays. Atlantic bigeye are commonly found at around 14 in. The IGFA world record is 50 cm, or about 20", caught in 2001. [1]
Because of the extreme depths at which it lives, most of what is known about the pelican eel comes from specimens that are inadvertently caught in deep sea fishing nets. [21] Although once regarded as a purely deep-sea species, since 1970, hundreds of specimens have been caught by fishermen, mostly in the Atlantic Ocean. [4]