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Most external appendages on the spider are attached to the cephalothorax, including the eyes, chelicerae and other mouthparts, pedipalps and legs. Like other arachnids, spiders are unable to chew their food, so they have a mouth part shaped like a short drinking straw that they use to suck up the liquefied insides of their prey.
A more complicated form of epigyne is found in spiders of the genus Araneus, where there is developed an appendage which is usually soft and flexible, and which is termed the scape or ovipositor. When there is a well-developed scape, the tip of it is usually more or less spoon-shaped. This part of the scape is termed the cochlear.
The cymbium is a spoon-shaped structure located at the end of the spider pedipalp that supports the palpal organ. [3] The cymbium may also be used as a stridulatory organ in spider courtship. [6] The embolus is a narrow whip-like or leaf-like extension of the palpal bulb.
Some abbreviations commonly found in descriptions of spider anatomy include: ALE: anterior lateral eyes [1] → eyes; ALS: anterior lateral spinnerets → spinneret; AME: anterior median eyes [1] → eyes; DTA: dorsal tegular apophysis, apophysis on the back of the tegulum; DTiA: dorsal tibial apophysis, apophysis on the back of a tibia
This file was derived from: Spider external anatomy.png: The image was cropped and re-labelled using current terminology. Author: Original: James Henry Emerton.
Various explanations have been proposed for the evolution of the complex structure of the palpal organs found in most groups of spiders. One is the "lock-and-key" theory. The epigyne of the female spider also has a complex shape, and studies of pairs killed instantaneously during copulation show a precise fit between the male and female ...
The jumping spider Phidippus audax.The basal parts of the chelicerae are the two iridescent green mouthparts. The chelicerae (/ k ə ˈ l ɪ s ər iː /) are the mouthparts of the subphylum Chelicerata, an arthropod group that includes arachnids, horseshoe crabs, and sea spiders.
Typically, each body segment carries one pair of appendages. An appendage which is modified to assist in feeding is known as a maxilliped or gnathopod. [citation needed] In annelids lateral protrusions from the body are called parapodia. In echinoderms an appendage called a pedicellaria is found. The end of the pedicellaria consists of valves ...