Abstract
Abstract A detailed analysis of 813 tests of the irregular echinoid Fibularia sp. collected from multiple depositional horizons at a single Oligocene locality on South Island, New Zealand revealed 57 specimens with drill holes, representing a 7% drilling frequency (57 drilled individuals). Among those drilled, 38% (22 individuals) had multiple drill holes with up to four holes present. Most holes were complete, circular to sub-circular in outline, averaging 0.5 mm in diameter, and belong to the ichnospecies Sedilichnus simplex. The distribution of holes on the test was non-random: 1) the aboral surface was drilled preferentially, and 2) the central region of the aboral surface had a significantly higher number of holes (p 0.1). The distribution of drill holes as well as their shape and size make it likely that they were produced by a predatory g...
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