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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.
Although they are known to feed on sea anemones, most sea anemones survive this ordeal, making the sea spider a parasite rather than a predator of sea anemones. [24] A few species such as Nymphonella tapetis are specialised endoparasites of bivalve mollusks. [43] [44] Not much is known about the primary predators of sea spiders, if any.
Sea spiders possess a tubular proboscis forward from the body trunk, at the end of which is the opening to the mouth. In those species that lack chelifores and palps, the proboscis is well developed and more mobile and flexible. In such cases, it can be equipped with sensory bristles and strong rasping ridges around the mouth.
Austrodecidae is a family of sea spiders. Austrodecids tend to be small measuring only 1–2 mm, characterized by an annulated proboscis with vertical slit-like mouth opening. [ 1 ] It is the most basal family of the order Pantopoda , representing a lineage (Stiripasterida) sister to all other pantopod families (Eupantopodida).
Colossendeis megalonyx is a species of pycnogonids, also known as sea spiders, in the famly Colossendeidae. The species was first described by Dutch zoologist Dr. Paulus Peronius Cato Hoek after his voyage on the HMS Challenger from 1873-1876.
In spiders, the coxae frequently have extensions called maxillae or gnathobases, which function as mouth parts with or without some contribution from the coxae of the anterior legs. The limbs themselves may be simple tactile organs outwardly resembling the legs, as in spiders , or chelate weapons (pincers) of great size, as in scorpions .
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However, in sea spider and arachnids, the pedipalps are more or less specialized for sensory [12] or prey-catching function [10] – for example scorpions have pincers [20] and male spiders have bulbous tips that act as syringes to inject sperm into the females' reproductive openings when mating.
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