MILIAMMELLUS Saidova and Burmistrova, 1978

 

 

Type species: Miliammellus legis Saidova and Burmistrova, in Burmistrova, 1978; OD.

Miliammellus Saidova and Burmistrova, in Burmistrova, 1978 (*453), p. 169.Silicoloculina Resig, Lowenstam, Echols. and Weiner,1980 (*2568), p. 212: type species: Silicoloculina profunda Resig et al.. 1980 = iliammellus legis Saidova and Burmistrova. 1978: OD.

Test small, up to 0.5 mm in length, ovoid, chambers in quinqueloculine arrangement as in the miliolids but slightly more than a half coil in length, so that those of successive whorls are offset, chambers widest at their base and narrowing toward the aperture; wall of imperforate opaline silica, thin, homoge­neous, insoluble in hydrochloric acid, ultra-structure of inner and outer organic mem­branes and a median layer of mineralized tubular rods, the mineralized layer consisting of two sheets of a two-dimensional array of rods aligned parallel to the wall surface, separated by a median layer that has a three-dimensional random array of rods in an open

mesh, the rods circular to angular in section, test surface smooth; aperture a low arch at the open end of the final chamber, with a broad simple tooth. U. Miocene to Holocene; Bering Sea; Antarctic; N. and central Pacific and Indian Oceans, at abyssal depths below 4,000 m.