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Information about Sclerotic Ring

Sclerotic rings are rings of bone found in the eyes of several groups of vertebrate animals, except for mammals and crocodilians.[1] They can be made up of single bones or small bones together.[2] They are believed to have a role in supporting the eye, especially in animals whose eyes are not spherical, or who live underwater.[1] Fossil sclerotic rings are known for a variety of extinct animals, including ichthyosaurs, pterosaurs, and dinosaurs,[3] but are often not preserved.

References

1. ^ Motani, Ryosuke. Eyes. Retrieved on 2007-07-06.
2. ^ Palaeos Vertebrates: Glossary S. Retrieved on 2007-07-06.
3. ^ Pigdon, Dann. Re: Sclerotic ring in eyes. Retrieved on 2007-07-06.
Bones are rigid organs that form part of the endoskeleton of vertebrates. They function to move, support, and protect the various organs of the body, produce red and white blood cells and store minerals.
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Eyes are organs of vision that detect light. Different kinds of light-sensitive organs are found in a variety of organisms. The simplest eyes do nothing but detect whether the surroundings are light or dark, while more complex eyes can distinguish shapes and colors.
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Vertebrata
Cuvier, 1812

Classes and Clades

See below
Vertebrates are members of the subphylum Vertebrata (within the phylum Chordata), specifically, those chordates with backbones or spinal columns.
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Mammalia
Linnaeus, 1758

Subclasses & Infraclasses
  • Subclass †Allotheria*
  • Subclass Prototheria
  • Subclass Theria

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Crocodilia
Owen, 1842

black: range of Crocodilia


Families
  • Gavialidae
  • Alligatoridae
  • Crocodylidae


Crocodilia
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For other uses of the term, see Fossil (disambiguation)


FOSSIL is a standard for allowing serial communication for telecommunications programs under the DOS operating system.
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extinction is the cessation of existence of a species or group of taxa, reducing biodiversity. The moment of extinction is generally considered to be the death of the last individual of that species (although the capacity to breed and recover may have been lost before this point).
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Ichthyosauria
Blainville, 1835

Families
  • Ichthyosauridae
  • Leptonectidae
  • Mixosauridae
  • Ophthalmosauridae
  • Shastasauridae
  • Stenopterygiidae
  • Teretocnemidae
Ichthyosaurs (Greek for 'fish lizard' -
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Pterosauria
Kaup, 1834

Suborders

Pterodactyloidea
Rhamphorhynchoidea *

Pterosaurs (/ˈtɛ.
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Dinosauria *
Owen, 1842

Orders & Suborders
  • Ornithischia
  • Cerapoda
  • Thyreophora
  • Saurischia

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