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Table 1 Specimens used in the study

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

Taxon sampled

Specimen number

Elements sectioned

Age and locality data, additional notes

Saurichthyidae

 Saurichthys sp.

PIMUZ T 757a

Opercle (fossil specimen)

Upper Besano Formation, Late Anisian, Mirigioli (P. 902), Meride, Ticino, Switzerland

 Saurichthys sp.

PIMUZ T 2138

Opercle and ceratohyal bone (fossil specimen)

Middle Besano Formation, Late Anisian; Cava Tre Fontane, Meride, Ticino, Switzerland

 Saurichthys sp.

PIMUZ T 2566

Opercle (fossil specimen)

Middle Besano Formation, Late Anisian; Valle Stelle, Meride, Ticino, Switzerland

 Saurichthys sp.

PIMUZ T 2641

Opercle (fossil specimen)

Cassina Member, Meride Formation, Early Ladinian; Cassina, Meride, Ticino, Switzerland

 Saurichthys sp.

PIMUZ T 5501

Opercle (fossil specimen)

Cassina Member, Meride Formation, Early Ladinian; Cassina, Meride, Ticino, Switzerland

 Saurichthys sp.

PIMUZ T 5736

Opercle (fossil specimen)

Cassina Member, Meride Formation, Early Ladinian; Cassina, Meride, Ticino, Switzerland

 Saurichthys sp.

PIMUZ T 5740

Opercle (fossil specimen)

Cassina Member, Meride Formation, Early Ladinian; Cassina, Meride, Ticino, Switzerland

 Saurichthys sp.

PIMUZ T 5788

Opercle (fossil specimen)

Cassina Member, Meride Formation, Early Ladinian; Cassina, Meride, Ticino, Switzerland

Acipenseridae

 Acipenser baerii (Siberian sturgeon)

PIMUZ A/I 4307; A/I 4308

Right subopercle (macerated specimens)

Extant, aquaculture raised in France/Switzerland (two female specimens, between 3 and 4 years old)

 Acipenser baerii (Siberian sturgeon)

PIMUZ A/I 4309; A/I 4010; A/I 4011

Right subopercle (macerated specimens)

Extant, aquaculture raised in France/Switzerland (three female specimens, ca. 6 years old)

Lepisosteidae

 Lepisosteus cf. L. oculatus (Spotted gar)

PIMUZ A/I 4170

Right subopercle and opercle (macerated specimen)

Extant, USA (no exact locality data available); (tentatively identified as L. oculatus based on narrow exposed anterodorsal subopercular process, straight articulation of opercle with dermohyal and rounded ventroposterior margin of subopercle)

Polypteridae

 Polypterus bichir (Nile bichir)

NMB 2793

Right subopercle and opercle (removal from wet specimen stored in alcohol)

Extant; standard length 54 cm, total length ca. 59 cm (caudal fin slightly damaged, <1 cm) (inheritance by R. Burckhardt in 1914)