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Table 1. Numbers and percentages of Calloria inconspicua and Notosaria nigricans displaying shell colouration in the fossil locality in the Wanganui Basin, New Zealand. Equivalent data for the Recent population of Calloria inconspicua from Portobello Harbour are also presented (Notosaria nigricans is absent from this locality).

 Calloria inconspicua

  Wanganui Basin (80 ka) Portobello Harbour (Recent)
 

Total Number of shells

Number(%) Coloured

Total Number of shells

Number(%)Coloured

Surface

54

36 (67%)

281

160 (57%)

Subsurface

323

261 (81%)

321

148 (46%)

         

 Notosaria nigricans 

  Wanganui Basin (80 ka)    
 

Total Number of shells

Number(%) Coloured

   
Surface

23

5 (22%)

-

-

Subsurface

179

75 (42%)

-

-

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