Genera of order “Miliolida”


Test ellipsoidal to fusiform or cylindrical, rarely spherical. Chambers rapidly increasing in width resulting in progressive elongation of the test. Apertures in a double row.


Large discoidal test, biconcave with thickened rims. Cyclic chambers subdivided by chamberlets. Apertures consist of numerous pores on the peripheral margin arranged in two or more alternating rows.


Flat test, early stage planispirally coiled and involute, chambers rapidly increasing in breadth so that test becomes peneropliform, then flabelliform and finally ends in broad strongly arched chambers.


Compressed test with rounded periphery, early stage planispiral and involute with a thickened central boss. later chambers become cyclical.


Discoidal test with annular chambers that have internal subdivisions. Living specimens are green due to chlorophycean endosymbionts. Occurence: Carribean Sea.


Large discoidal test, early stages planispiral and involute, producing a central thickened part of the test, later chambers become annular.


Large discoidal test, biconcave with thickened periphery, apertures consist of numerous small circular openings on the peripheral wall.


Discoidal test with annular chambers that are subdivided into chamberlets. Green colour in living specimens is caused by chlorophycean endosymbionts. Occurence: Indopacific.


Discoidal test, early chambers are peneroplid, later chambers become annular and divided into chamberlets that are connected by a stolon system. Apertures occur along the peripheral margin, they are more or less circular and surrounded by a calcified rim. Living specimens have a brownish colour due to Symbiodinium endosymbionts.