2017-09-01 Coral Magazine
Because eyes rarely leave fossil traces, it has been difficult to track their genesis. But thanks to thorough research, includ- ...
system, a branch of the brain spe- cialized in measuring brightness. The basis for this process is the re- action of cells to sp ...
CORAL 43 In the course of evolution, nature has developed nu- merous very different light-sensing organs. The basic types are su ...
ALL: D. KNOP the light is coming. In the aquarium, we find pigment- cup eyes in many bristleworms and snails, such as Patella an ...
had a rolled shell that was snail-shaped, allowing them to descend easily to great depths and access flat water zones without ph ...
ALL: D. KNOP Although mantis shrimps are capable of seeing ultra- violet light and even different planes of polarized light, inc ...
cannot accurately assess mixed colors—for example, dark yellow and light orange look absolutely the same—but it saves time, a cr ...
levels of brightness. However, fishes have developed oth- er mechanisms (see below). The functional principle of sight is always ...
A B D F H C E G The retina of the human eye in section. Vertebrates such as humans and fishes see through the following layers: ...
the retina—in principle, exactly what a camera lens does when focusing. For sharp distant vision, the lens is pulled closer to t ...
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D. KNOP and his colleagues published a study demonstrating that some planktonic-living dinoflagellates have an ocelloid similar ...
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The adult Yellow Boxfish, Ostracion cubicus, a large species widespread in the Indo-Pacific, grows to about 18 inches (45cm) lon ...
Meet the Family Ostraciidae by Scott W. Michael BOXFISH BONANZA Mother Nature has equipped her piscine subjects with an amazing ...
BOXFISH BASICS As befits its common name, the body of the ostraciid is encased in a boxy carapace comprised of bony plates, or s ...
that a single adult boxfish can contain as much as 50 to 100 mg of crude toxin. Boxfishes are not thought to be susceptible to t ...
Honeycomb Cowfish (Acanthostracion polygonius) Western Atlantic, Caribbean. 48 cm (18.9 inches) Scrawled Cowfish (Acanthostracio ...
Spawning occurs at dusk, when a territory- holding male moves to a rendezvous site within his territory to court and spawn with ...
Thornback Cowfish (Lactoria fornasini) Indo-West Pacific. 15 cm (5.9 inches) (and associated mouth parts). The juvenile individu ...
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