Fig. 9

Micrographs of some sporomorph species from the Ameki Formation. 1 – Monoporites annulatus Van der Hammen 1954 (34–42 μm); 2 – Retibrevitricolpites triangulatus Van Hoeken-Klinkenberg 1966 (35 μm); 3 – Gemmastephanocolporites brevicolpites Jan du Chêne, Onyike, and Sowunmi 1978 (23–25 μm); 4 – Momipites africanus Van Hoeken-Klinkenberg 1966 (29–30 μm); 5 – Polypodiaceoisporites retirugatus Muller 1968 (30–32 μm); 6 – Bombacidites africanus Takahashi and Jux 1989 (33 μm); 7 – Retitricolporites irregularis Van der Hammen et Wymstra 1964 (30–35 μm); 8 – Ctenolophonidites costatus Van Hoeken-Klinkenberg 1966 (40 μm); 9 – Proxapertites cursus Van Hoeken-Klinkenberg 1966 (50–55 μm); 10 – Cicatricosisporites dorogensis Potonié et Gelletich 1933 (25–30 μm); 11 – Perfotricolpites nigerianus Takahashi and Jux 1989 (60 × 35 μm); 12 – Margocolporites umuahiaensis Jan du Chêne, Onyike, and Sowunmi 1978 (40–55 μm); 13 – Praedapollis africanus Boltenhagen 1976 (52–55 μm); 14 – Retistephanocolpites williamsi Germeraad, Hopping and Muller 1968 (55 μm); 15 – Striatopollis catatumbus Gonzálaz Guzmán 1967 (47 × 38 μm); 16 – Striatopollis variabilis Takahashi and Jux 1989 (40 × 25 μm). Bar scale = 20 μm