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Olin (spider)
''Olin platnicki'' is the only species in the monotypic spider genus ''Olin'' in the family Trachycosmidae. It is native to Christmas Island and Sulawesi. Taxonomy The genus and species were first described in 2001 by Christa L. Deeleman-Reinhold. The generic name "''Olin''" was a random combination of letters, and the specific name "''platnicki''" is in honour of Norman Platnick. Characteristics ''Olin'' has long and projected chelicerae, and a relatively broad and low carapace, with the maxillae The maxilla (plural: ''maxillae'' ) in vertebrates is the upper fixed (not fixed in Neopterygii) bone of the jaw formed from the fusion of two maxillary bones. In humans, the upper jaw includes the hard palate in the front of the mouth. The t ... long and nearly parallel, with depressions laterally. There is little sexual dimorphism and no elongation on the fourth trochanter or coxae. References Trochanteriidae Spiders described in 2001 Spiders of Asia {{Troc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spider
Spiders (order Araneae) are air-breathing arthropods that have eight legs, chelicerae with fangs generally able to inject venom, and spinnerets that extrude silk. They are the largest order of arachnids and rank seventh in total species diversity among all orders of organisms. Spiders are found worldwide on every continent except for Antarctica, and have become established in nearly every land habitat. , 50,356 spider species in 132 families have been recorded by taxonomists. However, there has been debate among scientists about how families should be classified, with over 20 different classifications proposed since 1900. Anatomically, spiders (as with all arachnids) differ from other arthropods in that the usual body segments are fused into two tagmata, the cephalothorax or prosoma, and the opisthosoma, or abdomen, and joined by a small, cylindrical pedicel, however, as there is currently neither paleontological nor embryological evidence that spiders ever had a sep ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trachycosmidae
Trachycosmidae, is a family of spiders in the infraorder Araneomorphae. Identification They can be identified by the lateral spinnerets, which are separated by the length of their diameter and have their complete distal article without inflatable area. The presence of two major ampullate gland spigots and the epigynal field formed by an undivided plate. The lens of the anterior lateral eyes are convex, raised from the surrounding cuticle, which in Trochanteriidae is flat. Genera This family include 20 genera, most of which where part of the family Trochanteriidae Trochanteriidae is a family of spiders first described by Ferdinand Karsch in 1879 containing about 52 species in6 genera. Most are endemic to Australia though '' Doliomalus'' and '' Trochanteria'' are from South America and ''Plator'' is from As ... and Gallieniellidae: References Taxa described in 2002 Araneomorphae families Araneomorphae {{Spider-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Christmas Island
Christmas Island, officially the Territory of Christmas Island, is an Australian external territory comprising the island of the same name. It is located in the Indian Ocean, around south of Java and Sumatra and around north-west of the closest point on the Australian mainland. It lies northwest of Perth and south of Singapore. It has an area of . Christmas Island had a population of 1,692 residents , the majority living in settlements on the northern edge of the island. The main settlement is Flying Fish Cove. Historically, Asian Australians of Chinese, Malay, and Indian descent formed the majority of the population. Today, around two-thirds of the island's population is estimated to have Straits Chinese origin (though just 22.2% of the population declared a Chinese ancestry in 2021), with significant numbers of Malays and European Australians and smaller numbers of Straits Indians and Eurasians. Several languages are in use, including English, Malay, and vario ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sulawesi
Sulawesi (), also known as Celebes (), is an island in Indonesia. One of the four Greater Sunda Islands, and the world's eleventh-largest island, it is situated east of Borneo, west of the Maluku Islands, and south of Mindanao and the Sulu Archipelago. Within Indonesia, only Sumatra, Borneo, and Papua are larger in territory, and only Java and Sumatra have larger populations. The landmass of Sulawesi includes four peninsulas: the northern Minahasa Peninsula, the East Peninsula, the South Peninsula, and the Southeast Peninsula. Three gulfs separate these peninsulas: the Gulf of Tomini between the northern Minahasa and East peninsulas, the Tolo Gulf between the East and Southeast peninsulas, and the Bone Gulf between the South and Southeast peninsulas. The Strait of Makassar runs along the western side of the island and separates the island from Borneo. Etymology The name ''Sulawesi'' possibly comes from the words ''sula'' ("island") and ''besi'' ("iron") and may ref ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Christa L
{{disambiguation, surname ...
Christa may refer to: * Christa (given name), a female given name * Janusz Christa (1934-2008), Polish comics author * ''Swedish Fly Girls'', a 1971 film also known as ''Christa'' * 1015 Christa, an asteroid See also * Christ (other) * Christa-Elizabeth * Christe * Christi * Christo (other) * Christy (other) * Crista * Christia * Krista Krista is a female given name, a mostly North European (Finland, Estonia and Sweden) variant of the male name Christian. The name Krista can be spelled with a "Ch", making it Christa. It means "Follower of Christ". People named Krista *Krista Al ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Norman Platnick
Norman Ira Platnick (December 30, 1951 – April 8, 2020) was an American biological systematist and arachnologist. At the time of his death, he was a professor emeritus of the Richard Gilder Graduate School and Peter J. Solomon Family Curator Emeritus of the invertebrate zoology department of the American Museum of Natural History. A 1973 Ph.D. recipient at Harvard University, Platnick described over 1,800 species of spiders from around the world, making him the second most prolific spider taxonomist in history, behind only Eugène Simon. Until 2014 he was also the maintainer of the World Spider Catalog, a website formerly hosted by the AMNH which tracks the arachnology literature, and attempts to maintain a comprehensive list, sorted taxonomically, of every species of spider which has been formally described. In 2007 he received the International Society of Arachnology's Bonnet award, named for Pierre Bonnet, in recognition of his work on the catalog. Platnick was recogni ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chelicera
The chelicerae () 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 similarly to pincers. Some chelicerae, such as those found on nearly all spiders, are hollow and contain (or are connected to) venom glands, and are used to inject venom into prey or a perceived threat. In '' Pisaurina mira'', also known as the nursery web spider, the chelicerae are utilized to snatch the prey once it becomes within reach, facilitating the "sit-and-wait ambush predator" behavior. Both pseudoscorpions and harvestmen have structures on their chelicerae that are used for grooming (papillae in pseudoscorpions, cheliceral teeth in Opiliones). Types Chelicerae can be divided into three kinds: jackknife chelicerae, scissor chelicerae, and 3-segmented chelate chelicerae. Jackknife chelicerae The jackknife chelicera is subchelate (wit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carapace
A carapace is a dorsal (upper) section of the exoskeleton or shell in a number of animal groups, including arthropods, such as crustaceans and arachnids, as well as vertebrates, such as turtles and tortoises. In turtles and tortoises, the underside is called the plastron. Crustaceans In crustaceans, the carapace functions as a protective cover over the cephalothorax (i.e., the fused head and thorax, as distinct from the abdomen behind). Where it projects forward beyond the eyes, this projection is called a rostrum. The carapace is calcified to varying degrees in different crustaceans. Zooplankton within the phylum Crustacea also have a carapace. These include Cladocera, ostracods, and isopods, but isopods only have a developed "cephalic shield" carapace covering the head. Arachnids In arachnids, the carapace is formed by the fusion of prosomal tergites into a single plate which carries the eyes, ocularium, ozopores (a pair of openings of the scent gland of Opilione ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arthropod Mouthpart
The mouthparts of arthropods have evolved into a number of forms, each adapted to a different style or mode of feeding. Most mouthparts represent modified, paired appendages, which in ancestral forms would have appeared more like legs than mouthparts. In general, arthropods have mouthparts for cutting, chewing, piercing, sucking, shredding, siphoning, and filtering. This article outlines the basic elements of four arthropod groups: insects, myriapods, crustaceans and chelicerates. Insects are used as the model, with the novel mouthparts of the other groups introduced in turn. Insects are not, however, the ancestral form of the other arthropods discussed here. Insects Insect mouthparts exhibit a range of forms. The earliest insects had chewing mouthparts. Specialisation includes mouthparts modified for siphoning, piercing, sucking and sponging. These modifications have evolved a number of times. For example, mosquitoes (which are flies) and aphids (which are bugs) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sexual Dimorphism
Sexual dimorphism is the condition where the sexes of the same animal and/or plant species exhibit different morphological characteristics, particularly characteristics not directly involved in reproduction. The condition occurs in most animals and some plants. Differences may include secondary sex characteristics, size, weight, colour, markings, or behavioural or cognitive traits. These differences may be subtle or exaggerated and may be subjected to sexual selection and natural selection. The opposite of dimorphism is ''monomorphism'', which is when both biological sexes are phenotypically indistinguishable from each other. Overview Ornamentation and coloration Common and easily identified types of dimorphism consist of ornamentation and coloration, though not always apparent. A difference in coloration of sexes within a given species is called sexual dichromatism, which is commonly seen in many species of birds and reptiles. Sexual selection leads to the exaggerat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arthropod Leg
The arthropod leg is a form of jointed appendage of arthropods, usually used for walking. Many of the terms used for arthropod leg segments (called podomeres) are of Latin origin, and may be confused with terms for bones: ''coxa'' (meaning hip, plural ''coxae''), ''trochanter'', ''femur'' (plural ''femora''), ''tibia'' (plural ''tibiae''), ''tarsus'' (plural ''tarsi''), ''ischium'' (plural ''ischia''), ''metatarsus'', ''carpus'', ''dactylus'' (meaning finger), ''patella'' (plural ''patellae''). Homologies of leg segments between groups are difficult to prove and are the source of much argument. Some authors posit up to eleven segments per leg for the most recent common ancestor of extant arthropods but modern arthropods have eight or fewer. It has been argued that the ancestral leg need not have been so complex, and that other events, such as successive loss of function of a ''Hox''-gene, could result in parallel gains of leg segments. In arthropods, each of the leg segments ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trochanteriidae
Trochanteriidae is a family of spiders first described by Ferdinand Karsch in 1879 containing about 52 species in6 genera. Most are endemic to Australia though '' Doliomalus'' and '' Trochanteria'' are from South America and ''Plator'' is from Asia. '' Platyoides'' species exist in southern and eastern Africa, Madagascar, and the Canary Islands with one species, '' P. walteri'', introduced to Australia. Genera , the World Spider Catalog accepts the following genera: *'' Doliomalus'' Simon, 1897 – Chile *'' Hemicloea'' Thorell, 1870 – Australia, New Zealand *''Plator Plator (? –169 BC) the Illyrian was brother to King Gentius, the last Illyrian king of the Ardiaean State. Plator may have been killed because he wanted to marry Etuta in 169 BC. She was the daughter of Monunius and was married to Gentius ...'' Simon, 1880 – Asia *'' Platyoides'' O. Pickard-Cambridge, 1891 – Africa *'' Trochanteria'' Karsch, 1878 – Argentina, Paraguay, Brazil *'' Vectius'' Simon, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
