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Swiss Journal of Palaeontology
Fig. 2 | Swiss Journal of Palaeontology

Fig. 2

From: An assessment of age determination in fossil fish: the case of the opercula in the Mesozoic actinopterygian Saurichthys

Fig. 2

Opercular elements used in the study. Note that the number of bony elements covering the gills differs among species. a, c, e, g Elements in lateral view; b, d, f, h in medial (visceral) view. a, b Polypterus bichir (NMB 2793). c, d Acipenser baerii (PIMUZ A/I 4309). e, f Lepisosteus oculatus (PIMUZ A/I 4170). g Saurichthys sp. (PIMUZ T 2641). h Saurichthys sp. (PIMUZ T 5736). Pairs of black arrows indicate planes of sectioning. op opercle, so subopercle

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