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Types of chelicerae: (A) jackknife, (B) scissor, and (C) 3-segmented chelate 3D view of the chelicerae of a jumping spider. The pedipalps were removed to see the chelicerae. Chelicerae can be divided into three kinds: jackknife chelicerae, scissor chelicerae, and three-segmented chelate chelicerae. [2]
Pedipalps (commonly shortened to palps or palpi) are the secondary pair of forward appendages among chelicerates – a group of arthropods including spiders, scorpions, horseshoe crabs, and sea spiders. The pedipalps are lateral to the chelicerae ("jaws") and anterior to the first pair of walking legs.
Chelicerae and pedipalps are the two pairs of appendages closest to the mouth; they vary widely in form and function and the consistent difference between them is their position in the embryo and corresponding neurons: chelicerae are deutocerebral and arise from somite 1, ahead of the mouth, while pedipalps are tritocerebral and arise from ...
The cephalothorax, also called prosoma, is composed of two primary surfaces: a dorsal carapace and a ventral sternum.Most external appendages on the spider are attached to the cephalothorax, including the eyes, chelicerae and other mouthparts, pedipalps and legs.
Harvestmen pedipalps are anatomically laid out like the legs, the difference being that the proximal metatarsus and distal tarsus are merged, and simply called tarsus. [1] Pedipalpal identity is conferred by the Hox gene labial; reducing the expression of this gene transforms pedipalps into chelicerae. [6]
The propeltidium contains the eyes, the chelicerae that, in most species, are conspicuously large, the pedipalps and the first two pairs of legs. Meso- and metapeltidium contains the third and fourth pairs of legs. [7] [8] [9] The chelicerae serve as jaws and in many species also are used for stridulation. Unlike scorpions, solifuges do not ...
Chelicera (plural chelicerae): One of two appendages at the front of the carapace, made up of basal portion, the paturon, and the fang; [5] sometimes called the jaw; see also Chelicerae; Cheliceral furrow: A shallow groove on the basal portion of a chelicera accommodating the fang, usually having teeth on its margins [6]
Carnivores have chelicerae that tear and crush prey, whereas herbivores can have chelicerae that are modified for piercing and sucking (as do parasitic species). In sea spiders, the chelicerae (also known as chelifores) are short and chelate and are positioned on either side of the base of the proboscis or sometimes vestigial or absent.