Arachnids are arthropods in the class Arachnida of the subphylum Chelicerata. Arachnida includes, among others, spiders, scorpions, ticks, mites, pseudoscorpions, harvestmen, camel spiders, whip spiders and vinegaroons.
Pseudoscorpions, also known as false scorpions or book scorpions, are small, scorpion-like arachnids belonging to the order Pseudoscorpiones, also known as Pseudoscorpionida or Chelonethida.
Palpigradi is an order of very small arachnids commonly known as microwhip scorpion or palpigrades.
Uropygi is an arachnid order comprising invertebrates commonly known as whip scorpions or vinegaroons. They are often called uropygids. The name "whip scorpion" refers to their resemblance to true scorpions and possession of a whiplike tail, and "vinegaroon" refers to their ability when attacked to discharge an offensive, vinegar-smelling liquid, which contains acetic acid. The order may also be called Thelyphonida. Both names, Uropygi and Thelyphonida, may be used either in a narrow sense for the order of whip scorpions, or in a broad sense which includes the order Schizomida.
Solifugae is an order of animals in the class Arachnida known variously as camel spiders, wind scorpions, sun spiders, or solifuges. The order includes more than 1,000 described species in about 147 genera. Despite the common names, they are neither true scorpions nor true spiders. Most species of Solifugae live in dry climates and feed opportunistically on ground-dwelling arthropods and other small animals. The largest species grow to a length of 12–15 cm (5–6 in), including legs. A number of urban legends exaggerate the size and speed of the Solifugae, and their potential danger to humans, which is negligible.
The pygidium is the posterior body part or shield of crustaceans and some other arthropods, such as insects and the extinct trilobites. In groups other than insects, it contains the anus and, in females, the ovipositor. It is composed of fused body segments, sometimes with a tail, and separated from thoracic segments by an articulation.
Palaeoloxodon falconeri is an extinct species of dwarf elephant from the Middle Pleistocene of Sicily and Malta. It is amongst the smallest of all dwarf elephants at only 1 metre (3.3 ft) in height. A member of the genus Palaeoloxodon, it derived from a population of the mainland European straight-tusked elephant.
Amaranthus brownii was an annual herb in the family Amaranthaceae. The plant was found only on the small island of Nihoa in the Northwestern Hawaiian Islands, growing on rocky outcrops at altitudes of 120–215 m (394–705 ft). It was one of nine species of Amaranthus in the Hawaiian Islands, as well as the only endemic Hawaiian species of the genus. It is now considered extinct.
Carinascincus palfreymani, known commonly as the Pedra Branca skink, as well as the Palfreyman's window-eyed skink, the Pedra Branca cool-skink, or the red-throated skink, is a species of skink in the family Scincidae. The species is endemic to Australia, and is restricted to the windswept Pedra Branca, an island off southern Tasmania of only 2.5 ha, where it is dependent on the seabird colonies. It is the only lizard species found on the island.
The Sicilian shrew is a species of mammal in the family Soricidae. It is found in Sicily (Italy) and Gozo (Malta). Its natural habitat is temperate shrubland.
The Christmas Island shrew, also known as the Christmas Island musk-shrew is an extremely rare or possibly extinct shrew from Christmas Island. It was variously placed as subspecies of the Asian gray shrew or the Southeast Asian shrew, but morphological differences and the large distance between the species indicate that it is an entirely distinct species.
Gruta da Morena (MG-0270) is a limestone cave, considered the third largest cave in Minas Gerais, 15 km from Cordisburgo, Brazil. Reaching 4620 meters long, it presents five entrances, various halls and a stream. It is close to the road of Povoado do Onça, 6 km from the city. To get to the cave, it is first necessary to go through a trail. This specific cave has been very recently included in the area of influence of Gruta de Maquiné, once a new species of arachnid has also been found inside the cave, being it the third troglobitic species of Brazilian Palpigradi found in this cave and of characteristic very similar to the previous species Eukoenenia maquinenses.
Electrokoenenia yaksha is a Palpigrade that lived approximately 100 million years ago during the Cretaceous period. It is the first microwhip scorpion fossil from this period to be found and is currently the oldest known Palpigrade.
Seycellesa is a genus of spiders in the family Theridiidae. It consists of only its type species: Seycellesa braueri, which is endangered and endemic to the Seychelles.
Augusta Rucker was an American medical doctor, zoologist and public health lecturer.
Chanbria is a genus of camel spiders. It consists of four species found in the Sonoran Desert in Mexico and the southwestern United States.
Prokoeneniidae is a family of microscorpions in the order Palpigradi. There are at least two genera and about seven described species in Prokoeneniidae.
Eukoenenia is a genus of Eukoeneniid palpigrades, also known as microwhip scorpions, which was first described by Carl Julius Bernhard Börner in 1901.
Eukoenenia guzikae is a species of palpigrades, also known as microwhip scorpions, in the Eukoeneniidae family. It is endemic to Australia. It was described in 2008 by arachnologists Pablo Barranco and Mark Harvey.
