Lagenida

Lagenida is an order of benthic foraminiferal rhizaria in which the tests (shells) are monolamellar, with walls composed of optically and ultra-structurally radiate calcite, with the crystallographic c-axes perpendicular to the surface. Lagenids first appear in the Upper Silurian and continue to the Recent. They are currently divided into two superfamilies, the older Robuloidoidea which range from the Upper Silurian to the Lower Cretaceous (Albian) and the younger Nodosarioidea, ranging from the Permian to Recent.

==Taxonomic history== Lagenida (suborder Lagenina in Loeblich and Tappan 1988) is an emendation of the rotaliid superfamily Nodosarioidea, removing it from the Rotaliina in the Treatise on Invertebrate Paleontology (Loeblich and Tappan, 1964) and combining it with the Robuloidoidea, named by Reiss, 1963, to form a new order Lagenida. Robuloidoidea includes families previously included in the Fusulinida and found in either of the superfamilies Parathuramminoidea and Endothyroidea. Provided that robuloidoideans did actually give rise to nodosarioideans in the Triassic, the ultimate ancestry of Lagenida can be found within Fusulinida, but not the better known Fusulinoidea.