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Daihua Sanqiong
''Daihua sanqiong'' is a possible ancestor of comb jellies. It was a sessile relative to comb jellies. It had combs with cilia just like modern day comb jellies. It is named after the Dai people. The name means Dai flower. In 2019, ''Daihua'' and other Cambrian forms were hypothesized to be stem-group ctenophores Ctenophora (; : ctenophore ) is a phylum of marine invertebrates, commonly known as comb jellies, that marine habitats, inhabit sea waters worldwide. They are notable for the groups of cilia they use for swimming (commonly referred to as "combs .... This leads to the assertion that ctenophores evolved from immotile, suspensivorous forms, a lifestyle similar to that of polyps. Cladogram after Zhao ''et al.'', 2019: See also * '' Xianguangia'' * '' Dinomischus'' * '' Siphusauctum'' References Prehistoric animals Cambrian genera Fossil taxa described in 2019 Animals described in 2019 {{Cambrian-animal-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cambrian Stage 3
Cambrian Stage 3 is the still unnamed third stage of the Cambrian. It succeeds Cambrian Stage 2 and precedes Cambrian Stage 4, although neither its base nor top have been formally defined. The plan is for its lower boundary to correspond approximately to the first appearance of trilobites, about million years ago, though the globally asynchronous appearance of trilobites warrants the use of a separate, globally synchronous marker to define the base. The upper boundary and beginning of Cambrian Stage 4 is informally defined as the first appearance of the trilobite genera ''Olenellus'' or ''Redlichia'' around million years ago. Naming The International Commission on Stratigraphy has not officially named the 3rd stage of the Cambrian. The stage approximately corresponds to the "Atdabanian", which is used by geologists working in Siberia. Biostratigraphy The oldest trilobite known is ''Lemdadella'' which appears at the beginning of the ''Fallotaspis'' zone. The Cambrian radiation of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Comb Jellies
Ctenophora (; : ctenophore ) is a phylum of marine invertebrates, commonly known as comb jellies, that inhabit sea waters worldwide. They are notable for the groups of cilia they use for swimming (commonly referred to as "combs"), and they are the largest animals to swim with the help of cilia. Depending on the species, adult ctenophores range from a few millimeters to in size. 186 living species are recognised. Their bodies consist of a mass of jelly, with a layer two cells thick on the outside, and another lining the internal cavity. The phylum has a wide range of body forms, including the egg-shaped cydippids with a pair of retractable tentacles that capture prey, the flat, generally combless platyctenids, and the large-mouthed beroids, which prey on other ctenophores. Almost all ctenophores function as predators, taking prey ranging from microscopic larvae and rotifers to the adults of small crustaceans; the exceptions are juveniles of two species, which live a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dai People
The Dai people ( Burmese: ရှမ်းလူမျိုး; ; ; ; , ; , ; zh, c=, p=Dǎizú) are several Tai-speaking ethnic groups living in the Xishuangbanna Dai Autonomous Prefecture and the Dehong Dai and Jingpo Autonomous Prefecture of China's Yunnan Province. The Dai people form one of the 56 ethnic groups officially recognized by the People's Republic of China. By extension, the term can apply to groups in Laos, Vietnam, Thailand and Myanmar when Dai is used to mean specifically Tai Yai, Lue, Chinese Shan, Tai Dam, Tai Khao or even Tai in general. For other names, see the table below. Name ambiguity The Dai people are closely related to the Shan, Lao and Thai people who form a majority in Laos and Thailand, and a large minority in Myanmar. Originally, the Tai, or Dai, lived closely together in modern Yunnan Province until political chaos and wars in the north at the end of the Tang and Song dynasty and various nomadic peoples prompted some to move furth ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ctenophora
Ctenophora (; : ctenophore ) is a phylum of marine invertebrates, commonly known as comb jellies, that inhabit sea waters worldwide. They are notable for the groups of cilia they use for swimming (commonly referred to as "combs"), and they are the largest animals to swim with the help of cilia. Depending on the species, adult ctenophores range from a few millimeters to in size. 186 living species are recognised. Their bodies consist of a mass of jelly, with a layer two cells thick on the outside, and another lining the internal cavity. The phylum has a wide range of body forms, including the egg-shaped cydippids with a pair of retractable tentacles that capture prey, the flat, generally combless platyctenids, and the large-mouthed beroids, which prey on other ctenophores. Almost all ctenophores function as predators, taking prey ranging from microscopic larvae and rotifers to the adults of small crustaceans; the exceptions are juveniles of two species, which live a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polyp (zoology)
A polyp in zoology is one of two forms found in the phylum Cnidaria, the other being the medusa (biology), medusa. Polyps are roughly cylindrical in shape and elongated at the axis of the vase-shaped body. In solitary polyps, the aboral (opposite to oral) end is attached to the substrate (biology), substrate by means of a disc-like holdfast (biology), holdfast called a pedal disc, while in colony (biology), colonies of polyps it is connected to other polyps, either directly or indirectly. The oral end contains the mouth, and is surrounded by a circlet of tentacles. Classes In the class Anthozoa, comprising the sea anemones and corals, the individual is always a polyp; in the class Hydrozoa, however, the individual may be either a polyp or a medusa (biology), medusa, with most species undergoing a biological life cycle, life cycle with both a polyp stage and a medusa stage. In the class Scyphozoa, the medusa stage is dominant, and the polyp stage may or may not be present, depen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cnidaria
Cnidaria ( ) is a phylum under kingdom Animalia containing over 11,000 species of aquatic invertebrates found both in fresh water, freshwater and marine environments (predominantly the latter), including jellyfish, hydroid (zoology), hydroids, sea anemones, corals and some of the smallest marine parasites. Their distinguishing features are an uncentralized nervous system distributed throughout a gelatinous body and the presence of cnidocytes or cnidoblasts, specialized cells with ejectable flagella used mainly for envenomation and capturing prey. Their bodies consist of mesoglea, a non-living, jelly-like substance, sandwiched between two layers of epithelium that are mostly one cell (biology), cell thick. Cnidarians are also some of the few animals that can reproduce both sexually and asexually. Cnidarians mostly have two basic body forms: swimming medusa (biology), medusae and sessility (motility), sessile polyp (zoology), polyps, both of which are radially symmetrical with mou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Xianguangia
''Xianguangia'' is a soft-bodied sea anemone-like fossil animal from the Chengjiang Biota of China. Description ''Xianguangia sinica'' has a cylindrical body with a whorl of nearly 16 tentacles around the oral disc, similar to the modern anthozoans. The tentacles are feather-like with dense pinnules on both sides of the axis which would have been well adapted to filter feeding. A bowl-shaped attachment disc at the basal part might commonly have been buried in the sediment to allow its sedentary strategy on the sea floor. The body above the pedal disc is broad and cylindrical and may correspond to the internal gastrovascular cavity. It displays several distinct longitudinal grooves and ridges on the surface, indicating possible mesenteries. However, its phylogenetic affinity has long been questioned; it has even been alleged to be related to members of the Ediacara biota. Studies from the late 2010s onwards argued that it was likely to be member of the stem-group of Ctenophora (com ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dinomischus
''Dinomischus ''is an extinct genus of stalked filter-feeding animals within the Cambrian period, with specimens known from the Burgess Shale and the Maotianshan Shales. While long of uncertain affinities, recent studies have suggested it to be a stem-group ctenophore. History of study In his pioneering excavations of the Burgess Shale, Charles Doolittle Walcott excavated the first, and at the time only, specimen. It had evidently caught his eye, for he had taken the trouble to carefully photograph it—but he never found the time to describe the organism, and it was not until 1977 that Simon Conway Morris described the animal. He tracked down two further specimens, collected by further expeditions by teams from Harvard and the Royal Ontario Museum, allowing him to produce a reconstruction. Description ''Dinomischus isolatus'' reached 20 mm in height, was attached to the sea floor by a stalk, and looked loosely like a flower. The cup-shaped body at the top of the stalk ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Siphusauctum
''Siphusauctum'' is an extinct genus of filter-feeding animals that lived during the Middle Cambrian about 510 million years ago. Description ''Siphusauctum'' was a sessile animal that was attached to the substrate by a holdfast. It had a tulip-shaped body, called the calyx, into which it actively pumped water that entered through pores and filtered out and digested organic contents. It grew to a length of only about . It is suggested to have primarily consumed microplankton. Taxonomy Species ''Siphusauctum gregarium'' was described in 2012 from numerous fossils recovered from the "Tulip Beds" strata of the Burgess Shale of Yoho National Park, British Columbia, Canada. The generic name comes Latin ' ("cup" or "goblet") and ' ("large"), referring to the general shape and size of the animal. The specific epithet comes from Latin ' ("flock" or "herd") referring to the large numbers of specimens recovered. This species is colloquially referred to as the “Tulip Animal” d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prehistoric Animals
The following are lists of prehistoric animals: By type Land and avian animals * List of prehistoric amphibian genera * List of prehistoric mammals * List of fossil bird genera * List of crurotarsan genera Pterosaurs *List of pterosaur genera * List of informally named pterosaurs Dinosaurs * List of dinosaur genera * List of informally named dinosaurs * List of dinosaur species on display *Lists of dinosaur specimens * List of non-avian dinosaur species preserved with evidence of feathers * List of fictional dinosaurs =By location= * List of African dinosaurs * List of Asian dinosaurs * List of Australian and Antarctic dinosaurs * List of dinosaurs and other Mesozoic reptiles of New Zealand * List of European dinosaurs * List of Indian and Madagascan dinosaurs * List of North American dinosaurs ** List of Appalachian dinosaurs ** List of archosaurs of the Chinle Formation ** List of dinosaurs of the Morrison Formation * List of South American dinosaurs Marine animals Corals * L ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cambrian Genera
The Cambrian ( ) is the first geological period of the Paleozoic Era, and the Phanerozoic Eon. The Cambrian lasted 51.95 million years from the end of the preceding Ediacaran period 538.8 Ma (million years ago) to the beginning of the Ordovician Period 486.85 Ma. Most of the continents lay in the southern hemisphere surrounded by the vast Panthalassa Ocean. The assembly of Gondwana during the Ediacaran and early Cambrian led to the development of new convergent plate boundaries and continental-margin arc magmatism along its margins that helped drive up global temperatures. Laurentia lay across the equator, separated from Gondwana by the opening Iapetus Ocean. The Cambrian marked a profound change in life on Earth; prior to the Period, the majority of living organisms were small, unicellular and poorly preserved. Complex, multicellular organisms gradually became more common during the Ediacaran, but it was not until the Cambrian that fossil diversity seems to rapidly increase ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
