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Home Latest Update :  3 Tuesday April 2012
Other Genus
OrderFORAMINIFERIDA
Sub OrderINVOLUTININA
FamilyINVOLUTINIDAE
Sub FamilyAULOTORTINAE
Genus MILIOSPIRELLA


MILIOSPIRELLA Grigyalis, 1958

 

Type species: Miliospirella lithuanica Grigyalis, 1958; OD.

Miliospirella Grigyalis, in N. K. Bykova et al., 1958 (*475), p. 75.Test ovate in outline, proloculus followed by tubular undivided enrolled second cham­ber of nearly constant thickness throughout, coiling of the tubular chamber in three planes 60° apart, each whorl in a single plane, followed by a rotation of 120° to a new plane for the next complete whorl, axial rotation may cease in the adult that tends to become planispiral; wall calcareous, hyaline, coarsely perforate; aperture at the open end of the tubular chamber. M. Jurassic (Bajocian) to U. Jurassic (Kimmeridgian); USSR: Lithuania, Caucasus; Italy.

 

Remarks: Miliospirella is here transferred to the Aulotortinae because of the changing planes of coiling, similar to that in the early stage of some Aulotortus. Although the original description mentioned only the changing planes, the original figures appear to show a tendency toward a final planispiral stage, as also seen in Miliospirella delicata Ruggieri and Giunta (1965, *2668, p. 404), from the Italian Dogger. Miliospirella apparently lacks the secondary lamellar deposits of other Aulotortinae.

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