AnasibiritesAnasibirites is an extinct genus of ammonoid cephalopod from the lower upper Smithian Wasatchites distractus Zone.Distribution and diversityAnasibirites is characterized by a cosmopolitan distribution, which is unusual for Smithian aged ammonoids and probably a consequence of the Smithian-Spathian [boundary extinction]. Although about 60 species were erected, only two are valid, A. kingianus and A. multiformis Welter, 1922.