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Table 1 Summarized absolute and relative anatomical data of specimens used for histology and MRI (see also Figs. 5 and 6)

From: Optic-nerve-transmitted eyeshine, a new type of light emission from fish eyes

Species

Value type

Total length [mm]

Head diameter [mm)

Body volume [mm3]

Skull (bone) thickness [μm] (% of HD)

Dermis thickness [μm] (% of HD)

ON depth [mm] (% of HD)

ON layers [N]

ON layer thickness [μm]

(% of ONØ]

ON CSA [mm2] (% of head CSA)

T. delaisi

absolute

53.6 ± 4.6

6.9 ± 0.4

684 ± 133

54.0 ± 6.9

94.2 ± 8.0

1.57 ± 0.04

7.8 ± 0.8

54.9 ± 13.4

0.135 ± 0.040

relative

   

(0.76 ± 0.09)

(1.33 ± 0.12)

(22.1 ± 2.0)

 

(13.2 ± 2.1)

(0.35 ± 0.07)

10

N

10

10

10

3

3

3

3

3

3

T. melanurus

absolute

40.5 ± 5.1

4.9 ± 06

258 ± 86

38.3 ± 7.5

35.3 ± 6.2

1.09 ± 0.05

6.5 ± 0.7

40.1 ± 11.1

0.065 ± 0.035

relative

   

(0.78 ± 0.01)

(0.72 ± 0.004)

(22.3 ± 3.0)

 

(14.2 ± 0.03)

(0.36 ± 0.12)

4

N

4

4

4

2

2

2

2

2

2

P. zvonimiri

absolute

42

5.55

339

84.2 ± 54.7a

260.6 ± 160.4a

1.38 ± 0.21a

4.5a

63.5 ± 8.4a

0.124 ± 0.037a

relative

   

(1.52 ± 0.99)a

(4.70 ± 2.89)a

(24.9 ± 3.8)a

 

(16.0 ± 2.1)a

(0.51 ± 0.15)a

1

N

1

1

1

1

1

1

1

1

1

A. ocellaris

absolute

52.9 ± 5.2

10.0 ± 1.2

1419 ± 503

255.5 ± 39.5

275.0 ± 80.9

2.16 ± 0.31

10.2 ± 0.8

42.7 ± 4.3

0.096 ± 0.007

relative

   

(2.50 ± 0.21)

(2.67 ± 0.52)

(21.1 ± 1.6)

 

(12.2 ± 1.7)

(0.12 ± 0.03)

9

N

9

9

9

4

4

4

3

3

3

  1. Data represent mean ± SD of N individuals or of repeated measurements within single individual (a). Reduced N caused by splitting individuals over different methods. CSA cross-sectional area, head CSA calculated as \( \frac{\pi}{4} \) HD 2; HD head diameter, calculated as mean of head width and height; ON optic nerve; ON Ø optic nerve diameter