[genus] Furca (Latin for `fork`) is an extinct genus of Marrellomorph arthropod known from the Sandbian stage (upper Ordovician period) of the Czech Republic. At least three distinct species have been described although they may all be synonyms of the type species, Furca bohemica. A tentative additional species, `Furca mauretanica`: was pro... Found on http://en.wikipedia.org/wiki/Furca_(genus)
(from the article `crustacean`) ...four somites fuse with the acron to form the head. At the posterior end of the body there is another unsegmented region, the telson, that may bear ... Found on http://www.britannica.com/eb/a-z/f/71