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Agnostus Calvus
''Agnostus'' is a genus of agnostid trilobites, belonging to the family Agnostidae, that lived during the late Middle Cambrian – Upper Cambrian (about 506 to 485 million years ago). It is the type genus of the family (biology), family Agnostidae and is subdivided into two subgenera, ''Agnostus'' and ''Homagnostus''. Etymology ''Agnostus'' is from the Ancient Greek άγνωστος (''ágnostos'') "unknown", and reflects the fact that early paleontologists did not know what type of animal with which they were confronted. The species epithet has this origin: * ''pisiformis'' derives from the Latin ''pīsum'' which means "pea", and ''forma'' meaning "shape", for its globe-like appearance when rolled. Description Like all Agnostida, ''Agnostus'' is diminutive and the headshield (or Cephalon (arthropod head)#Trilobites, cephalon) and tailshield (or pygidium) are around the same size (or Pygidium#Trilobites, isopygous) and outline. As in all Agnostina, ''Agnostus'' has two thor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alexandre Brongniart
Alexandre Brongniart (5 February 17707 October 1847) was a French chemist, mineralogist, geologist, paleontologist, and zoologist, who collaborated with Georges Cuvier on a study of the geology of the region around Paris. Observing fossil content as well as lithology in sequences, he classified Tertiary period, Tertiary Formation (geology), formations and was responsible for defining 19th century geological studies as a subject of science by assembling observations and classifications. Brongniart was also the founder of the Sèvres - Cité de la céramique, Musée national de Céramique-Sèvres (National Museum of Ceramics), having been director of the Manufacture nationale de Sèvres, Sèvres Porcelain Factory from 1800 to 1847. Life He was born in Paris, the son of the architect Alexandre-Théodore Brongniart and father of the botanist Adolphe-Théodore Brongniart. In 1788, he co-founded the French Philomathic Society of Paris. In 1797, he became an instructor of natural hi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
