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Scorpions have two eyes on the top of the cephalothorax, and usually two to five pairs of eyes along the front corners of the cephalothorax. While unable to form sharp images, their central eyes are amongst the most light sensitive in the animal kingdom, especially in dim light, which makes it possible for nocturnal species to use starlight to ...
Nepa anophthalma was first described in 1994 based on eleven or so specimens, and at the time was one of twelve or so species known from the cave. The species name roughly translates to "without eyes", which is after this species lacking eyes due to its troglobitic ecology.
Pseudoscorpions, also known as false scorpions or book scorpions, [1] are small, scorpion-like arachnids belonging to the order Pseudoscorpiones, also known as Pseudoscorpionida or Chelonethida. Pseudoscorpions are generally beneficial to humans because they prey on clothes moth larvae, carpet beetle larvae, booklice , ants , mites , and small ...
Arachnids have two kinds of eyes: the lateral and median ocelli. The lateral ocelli evolved from compound eyes and may have a tapetum, which enhances the ability to collect light. With the exception of scorpions, which can have up to five pairs of lateral ocelli, there are never more than three pairs present.
It was one of the largest scorpions to have ever lived, with the largest known individual having an estimated length exceeding 70 cm (28 inches). Pulmonoscorpius retains several general arthropod features which are absent in modern scorpions, such as large lateral eyes and a lack of adaptations for a burrowing lifestyle.
In southern Africa, thick-clawed scorpions belonging to the families Scorpionidae, Bothriuridae, and Ischnuridae, are generally assumed to be harmless. However, Opistophthalmus glabrifrons is an exception to the rule. Opistophthalmus species are burrowing scorpions, and probably never leave their burrows except when coming out to mate. This ...
Most of them have between two and five pairs of eyes. Some resemble the Vaejovidae. The Chaerilidae and Chactidae have one pair of eyes at most, and the former show a yellowish spot between and to the rear of these. [2] Their vernacular name refers to the thick tails found in many Buthidae, especially in the Old World.
Akrav israchanani was an eyeless, brown, troglobitic scorpion of about 50mm in length first described from only 20 dry, cuticular remains of hollow carcasses. [1] The combinations of characteristics was unusual enough for the scorpion to be placed in its own, monotypic family, however this has been called into question by later researchers.