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Megalodontidae
Megalodontidae is an extinct family of bivalve molluscs that reportedly lived from the Devonian to the Jurassic period. Nomenclature A family of insects was also previously called "Megalodontidae", containing the sawfly genus ''Megalodontes''. In order to remove the homonymy, that family has been renamed Megalodontesidae. Genera *†'' Conchodon'' *†'' Gemmellarodus'' di Stefano, 1912 *†''Megalodon'' Sowerby, 1827 *†''Neomegalodon ''Neomegalodon'' is an extinct genus of bivalve molluscs belonging to the family Megalodontidae. Species *†'' Neomegalodon cornutus'' Yao et al. 2007 *†'' Neomegalodon triqueter'' Wulfen 1793 Fossil record Fossils of ''Neomegalodon'' have ...'' Guembel, 1864 *†'' Pachyrisma'' *†'' Protomegalodon'' *†'' Pterocardia'' Bayan, 1874 *†'' Quemocuomegalodon'' Yao et al. 2003 *†'' Rhaetomegalodon'' *†'' Triadomegalodon'' Vegh-Neubrandt, 1974 References Bivalve families Prehistoric mollusc families Devonian first appearan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Megalodontesidae
The Megalodontesidae (until recently spelled Megalodontidae, a name already in use for a family of fossil molluscs) are a small family of sawflies, containing a single living genus, ''Megalodontes'', with some 40 species restricted to the temperate regions of Eurasia. Larvae of Megalodontesidae feed on herbaceous plants. They are distinguished from the closely related Pamphiliidae by their serrate or pectinate antennae. In 2016, a phylogenetic analysis of the superfamily Pamphilioidea found that the extinct family Praesiricidae was paraphyletic with respect to Megalodontesidae, so Praesiricidae was proposed as a synonym of Megalodontesidae. Genera As of 2016, the following genera belong to the family Megalodontesidae, divided into four subfamilies: * Subfamily Megalodontesinae (synonym: Rudisiriciinae ) ** †'' Aulidontes'' ** †'' Jibaissodes'' ** ''Megalodontes'' ** †'' Rudisiricius'' * Subfamily Archoxyelydinae ** †'' Archoxyelyda'' ** †'' Xyelydontes'' * Su ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neomegalodon
''Neomegalodon'' is an extinct genus of bivalve molluscs belonging to the family Megalodontidae. Species *†'' Neomegalodon cornutus'' Yao et al. 2007 *†'' Neomegalodon triqueter'' Wulfen 1793 Fossil record Fossils of ''Neomegalodon'' have been found in the Triassic (age range: from 235.0 to 201.6 million years ago). They are known from various localities of Italy, Austria, China, Germany, Hungary, Tajikistan and United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie .... References Prehistoric bivalve genera Bivalve taxonomy {{paleo-bivalve-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sawfly
Sawflies are the insects of the suborder Symphyta within the order Hymenoptera, alongside ants, bees, and wasps. The common name comes from the saw-like appearance of the ovipositor, which the females use to cut into the plants where they lay their eggs. The name is associated especially with the Tenthredinoidea, by far the largest superfamily in the suborder, with about 7,000 known species; in the entire suborder, there are 8,000 described species in more than 800 genera. Symphyta is paraphyletic, consisting of several basal groups within the order Hymenoptera, each one rooted inside the previous group, ending with the Apocrita which are not sawflies. The primary distinction between sawflies and the Apocrita – the ants, bees, and wasps – is that the adults lack a "wasp waist", and instead have a broad connection between the abdomen and the thorax. Some sawflies are Batesian mimics of wasps and bees, and the ovipositor can be mistaken for a stinger. Sawflies vary in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Megalodon (bivalve)
''Megalodon'' is an extinct genus of bivalve molluscs that reportedly lived from the Devonian to the Jurassic period. It is not clear, however, that all the fossils assigned to ''Megalodon'' from that span of time really belong in the same genus. Jurassic relatives of ''Megalodon'' such as '' Pachyrisma grande'' were closely related to the rudists. Species *†'' Megalodon hungaricum'' *†''Megalodon longjiangensis'' *†''Megalodon rostratiforme'' *†''Megalodon yanceyi'' *†''Megalodon abbreviatus Megalodon (''Otodus megalodon''), meaning "big tooth", is an extinct species of mackerel shark that lived approximately 23 to 3.6 million years ago (Mya), from the Early Miocene to the Pliocene epochs. It was formerly thought to be a me ...'' Distribution Fossils of the bivalve ''Megalodon'' have been found in: ;Devonian * Austria, Canada (Alberta), Germany, and Italy ;Permian * China and Malaysia ;Triassic * Bulgaria, Colombia, Hungary, Italy, Serbia and Mo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Devonian First Appearances
The Devonian ( ) is a geologic period and system of the Paleozoic era, spanning 60.3 million years from the end of the Silurian, million years ago (Mya), to the beginning of the Carboniferous, Mya. It is named after Devon, England, where rocks from this period were first studied. The first significant adaptive radiation of life on dry land occurred during the Devonian. Free-sporing vascular plants began to spread across dry land, forming extensive forests which covered the continents. By the middle of the Devonian, several groups of plants had evolved leaves and true roots, and by the end of the period the first seed-bearing plants appeared. The arthropod groups of myriapods, arachnids and hexapods also became well-established early in this period, after starting their expansion to land at least from the Ordovician period. Fish reached substantial diversity during this time, leading the Devonian to often be dubbed the Age of Fishes. The placoderms began dominating ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prehistoric Mollusc Families
Prehistory, also known as pre-literary history, is the period of human history between the use of the first stone tools by hominins 3.3 million years ago and the beginning of recorded history with the invention of writing systems. The use of symbols, marks, and images appears very early among humans, but the earliest known writing systems appeared 5000 years ago. It took thousands of years for writing systems to be widely adopted, with writing spreading to almost all cultures by the 19th century. The end of prehistory therefore came at very different times in different places, and the term is less often used in discussing societies where prehistory ended relatively recently. In the early Bronze Age, Sumer in Mesopotamia, the Indus Valley Civilisation, and ancient Egypt were the first civilizations to develop their own scripts and to keep historical records, with their neighbors following. Most other civilizations reached the end of prehistory during the following Iro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bivalve Families
Bivalvia (), in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of marine and freshwater molluscs that have laterally compressed bodies enclosed by a shell consisting of two hinged parts. As a group, bivalves have no head and they lack some usual molluscan organs, like the radula and the odontophore. They include the clams, oysters, cockles, mussels, scallops, and numerous other families that live in saltwater, as well as a number of families that live in freshwater. The majority are filter feeders. The gills have evolved into ctenidia, specialised organs for feeding and breathing. Most bivalves bury themselves in sediment, where they are relatively safe from predation. Others lie on the sea floor or attach themselves to rocks or other hard surfaces. Some bivalves, such as the scallops and file shells, can swim. The shipworms bore into wood, clay, or stone and live inside these substances. The shell of a bivalve is composed of calcium ca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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