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Chelicerata split from Mandibulata by the mid-Cambrian, as evidenced by stem-group chelicerates like Habeliida and Mollisonia present by this time. [2] The surviving marine species include the four species of xiphosurans (horseshoe crabs), and possibly the 1,300 species of pycnogonids (sea spiders), if the latter are indeed chelicerates.
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. Commonly referred to as "jaws", chelicerae may be shaped as either articulated fangs, or as a type of pincers.
Chaetopelma lymberakisi is a species of tarantula commonly known as the Cretan tarantula.Its native range is restricted to the island of Crete.It was first described in 2019 by Maria Chatzaki and Marjan Komnenov and is named in honor of Petros Lymberakis, curator of vertebrates at the Natural History Museum of Crete. [1]
Sanctacaris is a Middle Cambrian arthropod from the Burgess Shale of British Columbia.It was most famously regarded as a stem-group chelicerate, a group which includes horseshoe crabs, spiders and scorpions, although subsequent phylogenetic studies have not always supported this conclusion. [1]
The subphylum Mandibulata constitutes one of the major subdivisions of the phylum Arthropoda, alongside Chelicerata. Mandibulates include the crustaceans , myriapods ( centipedes and millipedes ), and all true insects .
The genus is characterized by a capsule-like dorsal exoskeleton (), which was divided into a subequal size of cephalon and pygidium with 7 thoracic segments in between. . Below the cephalon was a pair of huge compound eyes, followed by a series of walking legs and gnathobasic (jaw-like) limbs, each have 3 pairs in
P. cheliferoides is a dark-coloured harvestman. They are extremely sexual dimorphic: males have exaggerated chelicerae (jaws), which are reduced in females. As with several other species of the genus Pantopsalis, the male chelicerae have two morphs or forms, long and short.
Megalograptidae are a family of eurypterids, an extinct group of chelicerate arthropods commonly known as "sea scorpions".. The megalograptids were likely the first major successful group of eurypterids, evidenced by a Late Ordovician radiation.