Ground squirrels
- number of public records in bold
- corneal eyes
- URI: https://eol.org/schema/terms/corneal_eyes
- Definition: Because of the difference in refractive index between air and water (or corneal tissue), a curved cornea is an image-forming lens in its own right. Its focal length is determined by the radius of curvature of the cornea. Many corneal eyes (eg: in land vertebrates) also have lenses, but the lens is flattened and weakened compared with an aquatic lens; most of the refractive power is provided by the cornea. Corneal eyes cannot focus in aquatic habitat.
- Attribution: https://www.britannica.com/science/photoreception/Single-chambered-eyes#ref278820
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Ground squirrels includes 15 children:
- Spermophilus alashanicus Büchner 1888 (Alashan Ground Squirrel)
- Spermophilus brevicauda Brandt 1843
- Spermophilus citellus (Linnaeus 1766) (European Ground Squirrel)
- Spermophilus dauricus Brandt 1843
- Spermophilus erythrogenys Brandt 1841 (Red-cheeked Ground Squirrel)
- Spermophilus fulvus (Lichtenstein 1823) (Yellow Ground Squirrel)
- Spermophilus major (Pallas 1778) (Russet Ground Squirrel)
- Spermophilus musicus Ménétries 1832 (Caucasian Mountain Ground Squirrel)
- Spermophilus pallidicauda (Satunin 1903)
- Spermophilus pygmaeus (Pallas 1778) (Little Ground Squirrel)
- Spermophilus ralli (Kuznetsov 1948)
- Spermophilus relictus (Kashkarov 1923) (Relict Ground Squirrel)
- Spermophilus suslicus (Güldenstaedt 1770) (Speckled Ground Squirrel)
- Spermophilus taurensis Gündüz, Jaarola, Tez, Yeniyurt, Polly & Searle 2007
- Spermophilus xanthoprymnus (Bennett 1835) (Anatolian ground squirrel) see more