Sea-spider
Guides
Callipallene brevirostris
Long-necked Sea Spider
Callipallene brevirostris is a sea spider species in the family Callipallenidae, commonly known as the Long-necked Sea Spider. It was originally described as Pallene brevirostris by Johnston in 1837 and later transferred to the genus Callipallene. The species is known from European waters and has two recognized subspecies: C. b. brevirostris and C. b. producta.
Chelicerata
Chelicerates
Chelicerata is a major subphylum of arthropods characterized by the presence of chelicerae—pincer-like or fang-like appendages that are the first pair of structures before the mouth. The group includes horseshoe crabs, sea spiders, and arachnids (spiders, scorpions, mites, ticks, harvestmen, and allies). Chelicerates diverged from other arthropods by the mid-Cambrian period, approximately 508 million years ago. With over 77,000 described living species and estimates suggesting hundreds of thousands more undescribed species, chelicerates represent one of the most diverse animal groups after insects. Most living species are terrestrial air-breathers, though marine lineages persist.