Pseudobiceros bedfordi  Laidlaw, 1903

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Pseudobiceros bedfordi is a common Indo-Pacific flatworm. It is characterized by the brown to black background colour, densely covered by minute white or yellowish spots. Distinctive are the broad pink transverse stripes, which are brown/black at their edges. The pseudotentacles are ruffled. The ventral side is bright pink.
This picture shows 2 specimens getting in contact, at this picture they start mating and show their bright pink ventral side.
The identification of this specimen was confirmed by Leslie Newman.