Definition: Apoplectoid refers to a type of fish with a single eyelid, which makes them appear more vulnerable to predators due to their lack of external eyes. The definition of an apoplectoid fish includes being one of the 10 species listed by the IUCN as threatened or critically endangered in Europe. In summary, an apoplectoid fish is a type of fish with only one eyelid. It's often depicted as vulnerable to predators due to this lack of external eyes. The term comes from Greek and means "less than a human eye," reflecting its appearance akin to the human eye without any external vision.
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