Fig. 6
Heterostegina (Vlerkina) sp. 1 panels a–g, Operculina cf. heterosteginoides panels h–k, Operculina complanata panels i–q, Operculina sp.1 panels r–x. a External view of 109_1_02. b Equatorial section of 109_1_02. c Axial section of 109_1_02. d Equatorial section of 109_1_00. e Detail of the embryo of 109_1_00. f Axial section of 109_1_00. g Equatorial section of 109_1_03. h External view of 107_2_04. i Equatorial section of 107_2_04. j Equatorial section of 107_2_06. k Axial section of 107_2_06. l External view of 29_2_04. m Equatorial section of 29_2_04. n External view of 109_1_07. o Equatorial section of 109_1_07. p Axial section of 109_1_07. q Equatorial section of 109_2_01. r External equatorial view of 108_2_11. s External axial view of 108_2_11. t Equatorial section of 108_2_11. u Axial section of 108_2_11. v Equatorial section of 109_2_02 which presents clearly bend septa. w Equatorial section of 108_1_07 which is characterized by an imperfect spiral. x Axial section of 108_1_07