Fig. 3. A–I in Trilobites from the latest Frasnian Kellwasser Crisis in North Africa (Mrirt, central Moroccan Meseta)

Fig. 3. A–I. Acuticryphops acuticeps (Kayser, 1889). A, H, I. Cephalon from section "2", upper trilobite association, UM2−RF 220, partially external mould, in dorsal view (A), × 6.9; in lateral view (H), eye lobe with more than 6 lenses, × 6.5; in frontal view (I), slightly tilted backward showing vincular furrow and ventral doublure, × 7.1. B, C. Cephalon from section "1", upper trilobite association, UM2−RF 221, external mould; in lateral view (B), eye lobe with 4 lenses, × 7.8; in dorsal view (C), × 8.2. D–F. Pygidium from section "2", upper trilobite association, UM2−RF 222, external mould; lateral view (D), × 14.5; in posterior view (E), × 10.7; in dorsal view (F), × 12.2. J–K. Otarion stigmatophthalmus (Richter, 1914), cranidium from section "2", upper trilobite association, UM2−RF 248, internal mould in dorsal view (J), × 14.1; in lateral view (K), × 14.8. L–Q. Pteroparia ziegleri maroccanica subsp. nov. from section "1", lower +