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covering all lenses. Unlike in schizochroal eyes, adjacent lenses were in direct contact with one another. Lens shape generally depended on cuticle thickness. The lenses of trilobites with thin cuticles were thin and biconvex, whereas those with thick cuticles had thick lenses, which in extreme
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cases, could be thick columns with the outer surface flattened and the inner surface hemispherical. Regardless of lens thickness, however, the point at which light was focused was roughly the same distance below the lens.
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Treatise on
Invertebrate Paleontology, Part O, Arthropoda 1, Trilobita, revised. Volume 1: Introduction, Order Agnostida, Order Redlichiida
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with many tiny lenses (sometimes more than 15,000, each 30-100μm, rarely larger). They are the oldest and most common type of
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Clarkson, Euan; Levi-Setti, Riccardo; Horváth, Gabor (2006). "The eyes of trilobites: The oldest preserved visual system".
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134:, Boulder, CO & Lawrence, KS: The Geological Society of America, Inc. & The University of Kansas, pp.
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Schoenemann, B. (October 2007), "Trilobite Eyes and a New Type of Neural
Superposition Eye in an Ancient System",
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Clarkson, E.N. (1997), "The Eye, Morphology, Function and
Evolution", in Kaesler, R.L. (ed.),
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Clarkson, E. N. K. (1979), "The Visual System of
Trilobites.",
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from the
Cambrian to the Permian periods. Lenses (composed of
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49:) covered a curved, kidney-shaped visual surface in a
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41:eye, and found in all orders of
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96:Palaeontographica Abteilung A
594:. You can help Knowledge by
329:Simple eye in invertebrates
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525:Infrared sensing in snakes
396:Evolution of color vision
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177:10.1016/j.asd.2006.08.002
116:10.1127/pala/281/2007/63
51:hexagonal close packing
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102:(1–3), Verlag: 63–91,
53:system, with a single
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20:The holochroal eye of
530:Monocular deprivation
489:Underwater camouflage
484:Structural coloration
462:Disruptive coloration
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510:Blindness in animals
442:Counter-illumination
391:Evolution of the eye
108:2007PalAA.281...63S
457:Deimatic behaviour
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560:Visual perception
555:Underwater vision
520:Feature detection
515:Eyespot apparatus
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346:Mollusc eye
23:Paralejurus
635:Categories
535:Ommatidium
467:coincident
432:Camouflage
410:Coloration
351:cephalopod
245:Chameleons
62:References
31:Holochroal
588:Trilobite
550:Rhopalium
383:Evolution
356:gastropod
324:Eye shine
319:Eagle eye
250:Dinosaurs
43:trilobite
39:trilobite
33:eyes are
417:Albinism
185:18089074
479:Mimicry
452:Crypsis
265:Mammals
136:114–132
104:Bibcode
47:calcite
270:horses
232:Vision
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83:: 1–22
586:This
339:human
260:Toads
240:Birds
592:stub
301:Eyes
280:cats
275:dogs
255:Fish
181:PMID
140:ISBN
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
