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Enteletoidea
Enteletoidea is an extinct superfamily of brachiopods in the order Orthida Orthida is an extinct order of brachiopods which appeared during the Early Cambrian period and became very diverse by the Ordovician, living in shallow-shelf seas. Orthids are the oldest member of the subphylum Rhynchonelliformea, and is the ord ..., containing: * Family Enteletidae * Family Draboviidae * Family Chrustenoporidae * Family Linoporellidae * Family Saukrodictyidae * Family Schizophoriidae References Rhynchonellata {{Paleo-protostome-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Orthida
Orthida is an extinct order of brachiopods which appeared during the Early Cambrian period and became very diverse by the Ordovician, living in shallow-shelf seas. Orthids are the oldest member of the subphylum Rhynchonelliformea, and is the order from which all other brachiopods of this group stem. Physically they are usually strophic, with well-developed interareas. They also commonly have radiating ribs, sulcus, and fold structures. Typically one valve, often the brachial valve, is flatter than the other. The interior structure of the brachial valves are usually simple. In shape they are sub-circular to elliptical, with typically biconvex valves. There is some debate over the forms that first appeared of this order as to how they should be classified. However, they began to differentiate themselves by the late Early Cambrian period, and by the late Cambrian period had diversified into numerous varieties and reach 2 to 5 cm in width. Specimens from the late Cambria ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wilhelm Heinrich Waagen
Wilhelm Heinrich Waagen (23 June 184124 March 1900) was a German geologist and paleontologist. He was born in Munich and died in Vienna. Overview He received a Doctor of Philosophy degree at the University of Munich, where he studied the rocks and fossils of the Jurassic system, and published an elaborate work on geology (''Versuch einer Allgemeinen Classification der Schichten des oberen Jura'') that was crowned by the university. In 1866 he became an instructor in palaeontology at the University of Munich and at the same time taught Princess Theresa and Prince Arnulf of Bavaria. Although an excellent teacher, and especially competent in practical work, Waagen, who was a most loyal Catholic, had little prospect of obtaining a professorship at the University of Munich. Consequently, in 1870, he accepted the offer of a position as assistant in the geological survey of India, and was appointed palaeontologist in 1874. In 1875, he returned permanently to Europe because of the severit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brachiopod
Brachiopods (), phylum Brachiopoda, are a phylum of trochozoan animals that have hard "valves" (shells) on the upper and lower surfaces, unlike the left and right arrangement in bivalve molluscs. Brachiopod valves are hinged at the rear end, while the front can be opened for feeding or closed for protection. Two major categories are traditionally recognized, articulate and inarticulate brachiopods. The word "articulate" is used to describe the tooth-and-groove structures of the valve-hinge which is present in the articulate group, and absent from the inarticulate group. This is the leading diagnostic skeletal feature, by which the two main groups can be readily distinguished as fossils. Articulate brachiopods have toothed hinges and simple, vertically-oriented opening and closing muscles. Conversely, inarticulate brachiopods have weak, untoothed hinges and a more complex system of vertical and oblique (diagonal) muscles used to keep the two valves aligned. In many brachiopods, a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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