Taxa named by a German paleontologist and geologist Werner Ernst Martin Janensch (November 11, 1878 – October 20, 1969). In addition to Friedrich von Huene, Janensch was probably Germany's most important dinosaur specialist from the early and middle twentieth century. His most famous and significant contributions stemmed from the expedition undertaken to the Tendaguru Beds in what is now Tanzania. As leader of an expedition (together with Edwin Hennig) set up by the Museum für Naturkunde in Berlin, where he worked as a curator, Janensch helped uncover an enormous quantity of fossils of late Jurassic period dinosaurs, including several complete Brachiosaurus skeletons, then the largest animal ever known. During his long subsequent career (he worked in Berlin from 1914 to 1961), Janensch named several new dinosaur taxa including Dicraeosaurus (1914) and Elaphrosaurus (1920). Janensch's Brachiosaurus were later determined to belong to a distinct, related genus, Giraffatitan.

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