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The olm (German: ⓘ) or ... (Proteus anguinus) is an aquatic salamander which is the only species in the genus Proteus of the family Proteidae [2] ... The olm's eyes ...
Some species have only rudimentary (or even absent) eyes (blind salamanders). Others lack pigmentation, rendering them a pale yellowish or pinkish color (e.g., Eurycea rathbuni ). With the notable exception of the olm ( Proteus anguinus ), all "cave salamanders" are members of the family Plethodontidae ("lungless salamanders").
The eyes of most salamanders are adapted primarily for vision at night. In some permanently aquatic species, they are reduced in size and have a simplified retinal structure, and in cave dwellers such as the Georgia blind salamander , they are absent or covered with a layer of skin.
The Texas blind salamander (Eurycea rathbuni) is a rare and endangered cave-dwelling troglobite amphibian native to San Marcos, Hays County, Texas, specifically the San Marcos Pool of the Edwards Aquifer. This species resembles the olm, another stygofaunal salamander from Europe. Unlike the olm, this amphibian's body is not as elongated, and ...
In species like the Mexican tetra, some populations may retain their eyes, while others have varying stages of eye loss, and can interbreed with one another. [4] Other species like the cave amphipod also display this relationship of surface and subterranean populations retaining a species relationship, adding to the complexity in understanding ...
Glaucoma is a progressive condition the eye causes damage to the optic nerve. [7] The damage to the optic nerve is usually caused by intraocular pressure [8] of the eye being elevated. Glaucoma can be seen in dogs, and less commonly, cats. Treatment [9] can be in the form of ocular medication, like prescription eye drops.
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The cave salamander is a relatively large lungless salamander, ranging in total length from 10 to 20 cm (4 to 8 in). The tail makes up a significant proportion of the total length, up to 60–65%. [3] Post-metamorphic individuals have orange to reddish orange backs and a pale, unmarked ventral surface.