FIGURE 1. Photograph of a plate with Paralebias cephalotes (P.36131, NHM, collected from Aix-en-Provence, France). Scale bar equals 6 cm.

FIGURE 2. Photographs of fossil killifish species examined in this study. 1, Prolebias rhenanus (Ru 99, Naturhistorisches Museum Basel); 2, Pr. stenoura (28491 n, NHM); 3, Paralebias cephalotes (P.1831a, NHM). Scale bars equal 1 cm.

FIGURE 3. Bar charts showing frequency distribution of meristic characters for the three fossil Killifish species Prolebias rhenanus (yellow), Pr. stenoura (green) and Paralebias cephalotes (blue). 1, number of vertebrae; 2, number of precaudal vertebrae; 3, number of caudal vertebrae; 4, number of dorsal pterygiophores; 5, number of anal pterygiophores.

FIGURE 4. Bar charts showing frequency distribution of morphometric data (in mm) for the three fossil Killifish species Prolebias rhenanus (yellow), Pr. stenoura (green) and Paralebias cephalotes (blue). 1, standard length; 2, precaudal length of vertebral column; 3, caudal length of vertebral column; 4, length of dorsal fin base; 5, length of anal fin base.