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Juliform
Juliformia is a taxonomic Order (biology), superorder of millipedes containing three living orders: Julida, Spirobolida, and Spirostreptida, and the extinct group Xyloiuloidea known only from fossils. Morphology The species possess long cylindrical bodies with sclerites (skeletal plates consisting of ventral sternites, lateral pleurites, and dorsal tergites) fused into complete rings. Juliform millipedes possess defensive ozadene, repugnatorial glands on all body segments except the last few, and are the only known millipedes to produce 1,4-Benzoquinone, quinones in their defensive secretions. Juliform males have two pairs of gonopods consisting of the modified 8th and 9th pair of legs: in Julida and Spirobolida the posterior gonopods (9th leg pair) are primarily involved in sperm-transferring, while in Spirostreptida it is the anterior gonopods (8th leg pair). Juliformians also lack Tömösváry organs and have a large collum (millipedes), collum (first body segment) which over ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Xyloiuloidea
Xyloiuloidea is an extinct superfamily of millipedes that existed from the Lower Devonian through the Upper Pennsylvanian period in Europe and North America. Description Xyloiuloids are more or less cylindrical, with sternites, pleurites, and tergites of each body segment fused into a complete ring. Adults possess 40 to 50 body rings. The legs are no longer than half the height of the body. The body surface is marked by small parallel grooves (striations), which vary in surface coverage between xyloiuloid families. Taxonomy Xyloiuloidea comprises four families: *† Gaspestriidae *† Nyraniidae *† Plagiascetidae *† Xyloiulidae The taxonomic history of Xyloiuloidea begins with Orator F. Cook designating the family Xyloiulidae in 1895. In 1969, Richard L. Hoffman established the families Nyraniidae and Plagiascetidae, and placed all three extinct families in the extant (still-living) order Spirobolida, as suborder "Xyloiulidea".Hoffman, Richard L., 1969. Myriapoda, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spirostreptidae
Spirostreptidae is a family of millipedes in the order Spirostreptida. It contains around 100 genera distributed in North and South America, the eastern Mediterranean, continental Africa, Madagascar, and Seychelles. It contains the following genera: *'' Analocostreptus'' *'' Anastreptus'' *'' Anethoporus'' *'' Archispirostreptus'' *'' Attemsostreptus'' *'' Aulonopygus'' *'' Autostreptus'' *'' Bicoxidens'' *'' Brasilostreptus'' *'' Brevitibius'' *'' Bucinogonus'' *'' Calathostreptus'' *'' Calostreptus'' *'' Camaricoproctus'' *'' Cearostreptus'' *'' Chamberlineptus'' *'' Charactopygus'' *'' Choristostreptus'' *'' Cladodeptus'' *'' Cladostreptus'' *'' Cochleostreptus'' *'' Cochliogonus'' *'' Collostreptus'' *'' Conchostreptus'' *'' Demangeptus'' *'' Diaporus'' *'' Dicyclostreptus'' *'' Eiphorus'' *'' Ellateptus'' *'' Epistreptus'' *'' Eumekius'' *'' Exallostreptus'' *'' Exospermastix'' *'' Exospermitius'' *'' Furcillogonus'' *'' Globanus'' *'' Gonepityche'' *'' Graphidostreptus'' *'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pennsylvanian (geology)
The Pennsylvanian ( , also known as Upper Carboniferous or Late Carboniferous) is, on the International Commission on Stratigraphy, ICS geologic timescale, the younger of two period (geology), subperiods of the Carboniferous Period (or the upper of two system (stratigraphy), subsystems of the Carboniferous System). It lasted from roughly . As with most other geochronology, geochronologic units, the stratum, rock beds that define the Pennsylvanian are well identified, but the exact date of the start and end are uncertain by a few hundred thousand years. The Pennsylvanian is named after the U.S. state of Pennsylvania, where the coal Bed (geology), beds of this age are widespread. The division between Pennsylvanian and Mississippian (geology), Mississippian comes from North American stratigraphy. In North America, where the early Carboniferous beds are primarily marine limestones, the Pennsylvanian was in the past treated as a full-fledged geologic period between the Mississippian ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lower Devonian
The Early Devonian is the first of three epochs comprising the Devonian period, corresponding to the Lower Devonian series. It lasted from and began with the Lochkovian Stage , which was followed by the Pragian from and then by the Emsian, which lasted until the Middle Devonian began, . During this time, the first ammonoids appeared, descending from bactritoid nautiloids. Ammonoids during this time period were simple and differed little from their nautiloid counterparts. These ammonoids belong to the order Agoniatitida, which in later epochs evolved to new ammonoid orders, for example Goniatitida and Clymeniida. This class of cephalopod molluscs would dominate the marine fauna until the beginning of the Mesozoic The Mesozoic Era is the Era (geology), era of Earth's Geologic time scale, geological history, lasting from about , comprising the Triassic, Jurassic and Cretaceous Period (geology), Periods. It is characterized by the dominance of archosaurian r ... Era. References ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Incertae Sedis
or is a term used for a taxonomy (biology), taxonomic group where its broader relationships are unknown or undefined. Alternatively, such groups are frequently referred to as "enigmatic taxa". In the system of open nomenclature, uncertainty at specific taxonomic levels is indicated by (of uncertain family), (of uncertain suborder), (of uncertain order) and similar terms. Examples * The fossil plant ''Paradinandra, Paradinandra suecica'' could not be assigned to any family, but was placed ''incertae sedis'' within the order Ericales when described in 2001. * The fossil ''Gluteus minimus (fossil), Gluteus minimus'', described in 1975, could not be assigned to any known animal phylum. The genus is therefore ''incertae sedis'' within the kingdom Animalia. * While it was unclear to which order the New World vultures (family Cathartidae) should be assigned, they were placed in Aves ''incertae sedis''. It was later agreed to place them in a separate order, Cathartiformes. * Boc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ommatoiulus Moreleti
''Ommatoiulus moreleti'' (spelt ''moreletii'' in older publications), commonly known as the Portuguese millipede, is a herbivorous millipede native to the western Iberian Peninsula where it shares its range with other ''Ommatoiulus'' species. From here, it has spread by international commerce to a number of new localities. This species was accidentally introduced into Australia without its natural enemies and has since become an invasive pest. This species has also been introduced into New Zealand. A number of methods have been developed to manage this millipede. Distribution ''O. moreleti'' is indigenous to the western Iberian Peninsula. It has spread to a number of Atlantic islands (Macaronesia and Bermuda), South Africa and Australia. This distribution appears to be related to 20th century shipping routes. Spread of ''O. moreleti'' by international trade may be facilitated by its ability to survive long sea voyages in a quiescent state. This species survives long, dry summe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Collum (millipedes)
Millipedes (originating from the Latin , "thousand", and , "foot") are a group of arthropods that are characterised by having two pairs of jointed legs on most body segments; they are known scientifically as the class Diplopoda, the name derived from this feature. Each double-legged segment is a result of two single segments fused together. Most millipedes have very elongated cylindrical or flattened bodies with more than 20 segments, while pill millipedes are shorter and can roll into a tight ball. Although the name "millipede" derives from Latin for "thousand feet", no species was known to have 1,000 or more until the discovery in 2020 of ''Eumillipes persephone'', which can have over 1,300 legs. There are approximately 12,000 named species classified into 16 orders and around 140 families, making Diplopoda the largest class of myriapods, an arthropod group which also includes centipedes and other multi-legged creatures. Most millipedes are slow-moving detritivores, eating deca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gonopod
Gonopods are specialized appendages of various arthropods used in reproduction or egg-laying. In males, they facilitate the transfer of sperm from male to female during mating, and thus are a type of intromittent organ. In crustaceans and millipedes, gonopods are modified arthropod leg, walking or swimming legs. Gonopods may be highly decorated with elaborate structures which may play roles in sperm competition, and can be used to differentiate and identify closely related species. Gonopods generally occur in one or more pairs, as opposed to the single (un-paired) reproductive organs such as the aedeagus of insects or the Opiliones penis, penis of harvestmen. Insects In insects, gonopods are appendages of the genital segment that may be used in insemination, or that comprise the egg-laying apparatus. Crustaceans In male decapoda, decapod crustaceans, gonopods are modified swimming appendages (pleopods). The anterior two pair of pleopods in males are modified for sperm transferr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1,4-Benzoquinone
1,4-Benzoquinone, commonly known as ''para''-quinone, is a chemical compound with the chemical formula, formula C6H4O2. In a pure state, it forms bright-yellow crystals with a characteristic irritating odor, resembling that of chlorine, bleach, and hot plastic or formaldehyde. This six-membered ring compound is the oxidized derivative of 1,4-hydroquinone. The molecule is multifunctional: it exhibits properties of a ketone, being able to form oximes; an oxidant, forming the dihydroxy derivative; and an alkene, undergoing addition reactions, especially those typical for α,β-unsaturated carbonyl compound, α,β-unsaturated ketones. 1,4-Benzoquinone is sensitive toward both strong mineral acids and alkali, which cause condensation and decomposition of the compound. Preparation 1,4-Benzoquinone is prepared industrially by oxidation of hydroquinone, which can be obtained by several routes. One route involves oxidation of Diisopropylbenzenes, diisopropylbenzene and the Hock rearrangem ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tergite
A ''tergum'' (Latin for "the back"; : ''terga'', associated adjective tergal) is the Anatomical terms of location#Dorsal and ventral, dorsal ('upper') portion of an arthropod segment other than the head. The Anatomical terms of location#Anterior and posterior, anterior edge is called the 'base' and posterior edge is called the 'apex' or 'margin'. A given tergum may be divided into hardened plates or sclerites commonly referred to as tergites. In a Thorax (insect anatomy), thoracic segment, for example, the tergum may be divided into an anterior notum and a posterior Scutellum (insect), scutellum. Lateral extensions of a tergite are known as paranota (Greek for "alongside the back") or ''carinae'' (Latin for "keel"), exemplified by the flat-backed millipedes of the order Polydesmida. Kinorhynchs have tergal and sternal plates too, though seemingly not homologous with those of arthropods. Tergo-tergal is a stridulation, stridulatory mechanism in which fine spines of the abdominal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
