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Ricinulei
Ricinulei is a small order of arachnids. Like most arachnids, they are predatory; eating small arthropods. They occur today in west-central Africa ('' Ricinoides'') and the Americas ('' Cryptocellus'' and '' Pseudocellus'') from Brazil to southern Texas, where they inhabit either leaf-litter or caves. As of 2022, 103 extant species of ricinuleids have been described worldwide, all in the single family Ricinoididae. Due to their obscurity they do not have a proper common-name, though in academic literature they are occasionally referred to as hooded tickspiders. In addition to the three living genera, Ricinulei has a fossil-record spanning over 300 million years, including fossils from the Late Carboniferous of Euramerica and the Cretaceous Burmese amber. Anatomy and physiology The most important general account of ricinuleid anatomy remains the 1904 monograph by Hans Jacob Hansen and William Sørensen. Useful further studies can be found in, e.g., the work of Pittard and Mitche ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ricinulei From Fernandez & Giribet, Nymph Of Ricinoides Atewa (2015) (cropped)
Ricinulei is a small order of arachnids. Like most arachnids, they are predatory; eating small arthropods. They occur today in west-central Africa (''Ricinoides'') and the Americas (''Cryptocellus'' and ''Pseudocellus'') from Brazil to southern Texas, where they inhabit either leaf-litter or caves. As of 2022, 103 extant species of ricinuleids have been described worldwide, all in the single family Ricinoididae. Due to their obscurity they do not have a proper common-name, though in academic literature they are occasionally referred to as hooded tickspiders. In addition to the three living genera, Ricinulei has a fossil-record spanning over 300 million years, including fossils from the Late Carboniferous of Euramerica and the Cretaceous Burmese amber. Anatomy and physiology The most important general account of ricinuleid anatomy remains the 1904 monograph by Hans Jacob Hansen and William Sørensen. Useful further studies can be found in, e.g., the work of Pittard and Mitchell, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ricinulei From Fernandez & Giribet, Male Ricinoides Karschii From Campo Reserve, Cameroon (2015) (cropped)
Ricinulei is a small order of arachnids. Like most arachnids, they are predatory; eating small arthropods. They occur today in west-central Africa (''Ricinoides'') and the Americas ('' Cryptocellus'' and '' Pseudocellus'') from Brazil to southern Texas, where they inhabit either leaf-litter or caves. As of 2022, 103 extant species of ricinuleids have been described worldwide, all in the single family Ricinoididae. Due to their obscurity they do not have a proper common-name, though in academic literature they are occasionally referred to as hooded tickspiders. In addition to the three living genera, Ricinulei has a fossil-record spanning over 300 million years, including fossils from the Late Carboniferous of Euramerica and the Cretaceous Burmese amber. Anatomy and physiology The most important general account of ricinuleid anatomy remains the 1904 monograph by Hans Jacob Hansen and William Sørensen. Useful further studies can be found in, e.g., the work of Pittard and Mitchell ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arachnid
Arachnids are arthropods in the Class (biology), class Arachnida () of the subphylum Chelicerata. Arachnida includes, among others, spiders, scorpions, ticks, mites, pseudoscorpions, opiliones, harvestmen, Solifugae, camel spiders, Amblypygi, whip spiders and Uropygi, vinegaroons. Adult arachnids have eight Arthropod leg, legs attached to the cephalothorax. In some species the frontmost pair of legs has converted to a sensory function, while in others, different appendages can grow large enough to take on the appearance of extra pairs of legs. Almost all Extant taxon, extant arachnids are terrestrial animal, terrestrial, living mainly on land. However, some inhabit freshwater environments and, with the exception of the pelagic zone, marine environments as well. They comprise over 110,000 named species, of which 51,000 are species of spiders. The term is derived from the Ancient Greek, Greek word (''aráchnē'', 'spider'), from the myth of the hubristic human weaver Arachne, w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cryptocellus
''Cryptocellus'' is an arachnid genus in the order Ricinulei, first described by John Westwood in 1874. It is native to the Neotropics. Species it contains forty-five species: * '' Cryptocellus abaporu'' Bonaldo & Pinto-da-Rocha, 2003 — Brazil * '' Cryptocellus adisi'' Platnick, 1988 — Brazil * '' Cryptocellus albosquamatus'' Cooke, 1967 — Guyana * '' Cryptocellus becki'' Platnick & Shadab, 1977 — Brazil * '' Cryptocellus bocas'' Platnick & Shadab, 1981 — Panama * '' Cryptocellus bordoni'' (Dumitresco & Juvara-balş, 1977) — Venezuela * '' Cryptocellus brignolii'' Cokendolpher, 2000 — Suriname * '' Cryptocellus canga'' Pinto-da-Rocha & Andrade, 2012 — Brazil * '' Cryptocellus canutama'' Botero-Trujillo, Carvalho, Florez D. & Prendini, 2021 — Brazil * '' Cryptocellus centralis'' Fage, 1921 — Costa Rica * ''Cryptocellus chimaera'' Botero-Trujillo & Valdez-Mondragón, 2016 — Ecuador * '' Cryptocellus chiriqui'' Platnick & Shadab, 1981 — Costa Rica, Panama ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trigonotarbida
The order Trigonotarbida is a group of extinct arachnids whose fossil record extends from the late Silurian to the early Permian ( Pridoli to Sakmarian).Dunlop, J. A., Penney, D. & Jekel, D. 2020A summary list of fossil spiders and their relatives In World Spider Catalog. Natural History Museum Bern, online at http://wsc.nmbe.ch , version 20.5 These animals are known from several localities in Europe and North America, as well as a single record from Argentina. Trigonotarbids can be envisaged as spider-like arachnids, but without silk-producing spinnerets. They ranged in size from a few millimetres to a few centimetres in body length and had segmented abdomens (opisthosoma), with the dorsal exoskeleton ( tergites) across the backs of the animals' abdomens, which were characteristically divided into three or five separate plates. Probably living as predators on other arthropods, some later trigonotarbid species were quite heavily armoured and protected themselves with spines and tub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pseudocellus
''Pseudocellus'' is an arachnid genus in the order Ricinulei, first described by Norman Platnick in 1980. It is native to the Neotropics The Neotropical realm is one of the eight biogeographic realms constituting Earth's land surface. Physically, it includes the tropical terrestrial ecoregions of the Americas and the entire South American temperate zone. Definition In biogeog .... Species it contains forty-one species: * '' Pseudocellus abeli'' Armas, 2017 — Cuba * '' Pseudocellus alux'' Armas & Agreda, 2016 — Guatemala * '' Pseudocellus aridus'' Teruel, 2015 — Cuba * '' Pseudocellus bifer'' Teruel, 2018 — Cuba * '' Pseudocellus barberi'' (Ewing, 1929) — Guatemala, Honduras (nomen dubium) * '' Pseudocellus blesti'' (Merrett, 1960) — Panama * '' Pseudocellus bolivari'' Gertsch, 1971 — Mexico * '' Pseudocellus boneti'' (Bolívar y Pieltain, 1942) — Mexico * '' Pseudocellus chankin'' Valdez-Mondragón & Francke, 2011 — Mexico * '' Pseudocellus cookei'' (G ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ricinoides
''Ricinoides'' is an arthropod genus (biology), genus in the family (biology), family Ricinoididae, first described by Henry Ellsworth Ewing, Henry Ewing in 1929. Distribution Species in this genus are found in West Africa. Species it contains sixteen species: * ''Ricinoides afzelii'' (Thorell, 1892) — Ghana, Guinea, Sierra Leone * ''Ricinoides atewa'' Naskrecki, 2008 — Ghana * ''Ricinoides crassipalpe'' (Hansen & Sørensen, 1904) — Cameroon, Equatorial Guinea * ''Ricinoides eburneus'' Botero-Trujillo, Sain & Prendini, 2021 — Côte d’Ivoire * ''Ricinoides feae'' (Hansen, 1921) — Guinea, Guinea-Bissau * ''Ricinoides hanseni'' Legg, 1976 — Sierra Leone * ''Ricinoides iita'' Botero-Trujillo, Sain & Prendini, 2021 — Nigeria * ''Ricinoides kakum'' Botero-Trujillo, Sain & Prendini, 2021 — Ghana * ''Ricinoides karschii'' (Hansen & Sørensen, 1904) — Cameroon, Congo, Gabon * ''Ricinoides leonensis'' Legg, 1978 — Sierra Leone * ''Ricinoides megahanseni'' Legg, 1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scorpion
Scorpions are predatory arachnids of the Order (biology), order Scorpiones. They have eight legs and are easily recognized by a pair of Chela (organ), grasping pincers and a narrow, segmented tail, often carried in a characteristic forward curve over the back and always ending with a stinger. The evolutionary history of scorpions goes back Silurian, 435 million years. They mainly live in deserts but have adapted to a wide range of environmental conditions, and can be found on all continents except Antarctica. There are over 2,500 described species, with 22 extant (living) families recognized to date. Their Taxonomy (biology), taxonomy is being revised to account for 21st-century genomic studies. Scorpions primarily prey on insects and other invertebrates, but some species hunt vertebrates. They use their pincers to restrain and kill prey, or to prevent their own predation. The Scorpion sting, venomous sting is used for offense and defense. During courtship, the male and female ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cryptocellus Goodnighti
''Cryptocellus goodnighti'' is an arachnid species in the genus '' Cryptocellus''. It occurs in Costa Rica.On the female of Cryptocellus goodnighti Arachnida: Ricinulei. Norman I. Platnick, The Journal of Arachnology, 1993, Volume 21, no. 1, pages 79-80article Retrieved 26 March 2016 References External links * * Arthropods of Central America Ricinulei Animals described in 1981 {{Arachnid-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Burmese Amber
Burmese amber, also known as Burmite or Kachin amber, is amber from the Hukawng Valley in northern Myanmar. The amber is dated to around 100 million years ago, during the latest Albian to earliest Cenomanian ages of the mid-Cretaceous period. The amber is of significant palaeontological interest due to the diversity of flora and fauna contained as inclusions, particularly arthropods including insects and arachnids but also birds, lizards, snakes, frogs and fragmentary dinosaur remains. The amber has been known and commercially exploited since the first century AD, and has been known to science since the mid-nineteenth century. Research on the deposit has attracted controversy due to the potential role of the amber trade in funding internal conflict in Myanmar and hazardous working conditions in the mines where it is collected. Geological context, depositional environment and age The amber is found in the Hukawng Basin, a large Cretaceous-Cenozoic sedimentary basin within north ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pedipalp
Pedipalps (commonly shortened to palps or palpi) are the secondary pair of forward appendages among Chelicerata, chelicerates – a group of arthropods including spiders, scorpions, horseshoe crabs, and sea spiders. The pedipalps are lateral to the chelicerae ("jaws") and anterior to the first pair of walking legs. Overview Pedipalps are composed of six segments or articles. From the proximal end (where they are attached to the body) to the distal, they are: the coxa, the Arthropod leg#Trochanter, trochanter, the Arthropod leg#Femur, femur, the short Glossary_of_spider_terms#patella, patella, the Glossary_of_spider_terms#tibia, tibia, and the Arthropod_leg#Tarsus, tarsus. In spiders, the coxae frequently have extensions called Glossary_of_spider_terms#maxilla , maxillae or gnathobases, which function as mouth parts with or without some contribution from the coxae of the anterior arthropod leg, legs. The limbs themselves may be simple tactile organs outwardly resembling the legs ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chelicerae
The chelicerae () are the arthropod mouthparts, 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 pincer_(biology), pincers. Some chelicerae, such as those found on nearly all spiders, are hollow and contain (or are connected to) venom glands, used to inject venom into prey or a perceived threat. Both pseudoscorpions and Opiliones , harvestmen have additional structures on their chelicerae that are used for grooming (papillae in pseudoscorpions, cheliceral teeth in Opiliones). In ''Paratrechalea'', males and females have shown to have a chelicerae dimorphism, because the chelicerae is used as a mating signal for females. Types Chelicerae can be divided into three kinds: jackknife chelicerae, scissor chelicerae, and three-segmented wikt:chelate, chelate chelicerae. Jackknife chelicerae The jackknife chelicer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
