"Megadiscosorus" is similar to "Armenoceras", but more breviconic and slightly exogastrically cyrtoconic and with the siphuncle in contact with the ventral wall.The Armenoceratidae most likely gave rise through "Armenoceras" to "Gonioceras" in the Chazyan, and later in the Middle Ordovician, possibly through either an early "Armenoceras" or "Nybyoceras" to "Actinoceras"




Stacey Dooley

Anastacia Jaclyn Dooley  (born 9 March 1987), known professionally as Stacey Dooley, is an English television presenter, journalist, documentary filmmaker, media personality, and author.