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Setapedites shares similarities with Offacolus like the elongated chelicerae and limb arrangement, however the number of segments is closer to that of Dibasterium.Unusually, it also shares some features with Habelia like the anal pouch and structure of the opisthosomal tergites. [1]
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.
Merostomata is a class of chelicerate arthropods that contains the extinct Eurypterida (sea scorpions) and the extant Xiphosura (horseshoe crabs). The term was originally used by James Dwight Dana to refer to Xiphosura only, but was emended by Henry Woodward to cover both groups.
The microscopic mite Lorryia formosa (). The mites are not a defined taxon, but is used for two distinct groups of arachnids, the Acariformes and the Parasitiformes.The phylogeny of the Acari has been relatively little studied, but molecular information from ribosomal DNA is being extensively used to understand relationships between groups.
Trombiculid mites are found throughout the world. In Europe and North America, they tend to be more prevalent in the hot and humid regions. In northern Europe, including the British Isles where they are called harvest mites, the species Neotrombicula autumnalis are found during the summer and autumn (in French, harvest mites are called aoûtat because they are common in August [19]).
Pseudoscorpions belong to the class Arachnida. [2] They are small arachnids with a flat, pear-shaped body, and pincer-like pedipalps that resemble those of scorpions.They usually range from 2 to 8 mm (0.08 to 0.31 in) in length. [3]
[7] The Oribatida are of economic importance as hosts of various tapeworm species, [8] and by increasing the breakdown of organic material in the soil, in a similar manner to earthworms. [9] Many species of oribatid mites require extremely specific habitats, resulting in large diversity within the order due to the many niches they evolve to.
Cheyletidae is a family of mites in the order Trombidiformes.Some members are parasites of birds and mammals, causing cheyletiellosis, or "walking dandruff".Others are free-ranging predators which can be found in soil, forest litter, animal nests, and house dust, under tree bark, and on foliage.