Tetragramma variolare (BROGNIART, 1822) aboral ambulacral zone view
Tetragramma variolare (BROGNIART, 1822) , specimen over matrix, aboral view with ambulacral zone detail, Calcários Apinhoados da Costa D'Arnes formation, Upper Cenomanian, Portugal.
40 mm.
From the album:
Echinoidea from Calcários Apinhoados da Costa D'Arnes formation
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Photo Information
- Taken with Canon Canon EOS 550D
- Focal Length 50 mm
- Exposure Time 1/10
- f Aperture f/11.0
- ISO Speed 400
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