👉 The term "siphonaptera" is a genus of bacteria that belong to the class of Gram-negative rods. It was first described in 1905 by Ernst Haeckel and later named after the German bacteriologist Julius Sippenhagen, who discovered it in the mid-20th century. The siphonaptera belongs to a large family of bacteria known as the Prochlorobacteria. The genus includes a wide variety of species that are