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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.
Paired maxillae cut food and manipulate it during mastication. Maxillae can have hairs and "teeth" along their inner margins. At the outer margin, the galea is a cupped or scoop-like structure, which sits over the outer edge of the labium. They also have palps, which are used to sense the characteristics of potential foods.
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]
It is a distinctive feature of the subphylum Chelicerata (arachnids, horseshoe crabs and others). Although it is similar in most respects to an abdomen (and is often referred to as such), the opisthosoma is differentiated by its inclusion of the respiratory organs (book lungs or book gills) and the heart.
Conclusively, the classic, morphology-based one-by-one alingment to the prosomal appendages of other chelicerates was confirm by both neuroanatomic and genetic evidences. [ 29 ] [ 30 ] Noticeably, the order of pycnogonid leg pairs are mismatched to those of other chelicerates, starting from the ovigers which are homologous to the 1st leg pair ...
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.
The vast majority of the content of the list below, including the valid genera, preoccupied names, junior synonyms, taxonomical classifications and sites of discovery, is based upon the 2018 edition of the Summary list. Content not based on the list, such as genera described after its publication, is noted through inline citations.