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Abstract
The feeding behavior of the giant ambush-predator “Bobbit worm” (Eunice aphroditois) is spectacular. They hide in their burrows until they explode upwards grabbing unsuspecting prey with a snap of their powerful jaws. The still living prey are then pulled into the sediment for consumption. Although predatory polychaetes have existed since the early Paleozoic, their bodies comprise mainly soft tissue, resulting in a very incomplete fossil record, and virtually nothing is known about their burrows and behavior beneath the seafloor. Here we use morphological, sedimentological, and geochemical data from Miocene strata in northeast Taiwan to erect a new ichnogenus, Pennichnus. This trace fossil consists of an up to 2 m long, 2–3 cm in diameter, L-shaped burrow with distinct feather-like structures around the upper shaft. A comparison of Pennichnus to biological analogs strongly suggests that this new ichnogenus is associated with ambush-predatory worms that lived about 20 million years ago.
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Details
1 National Taiwan University, Department of Geosciences, Taipei, Taiwan (GRID:grid.19188.39) (ISNI:0000 0004 0546 0241); Simon Fraser University, Department of Earth Sciences, Burnaby, Canada (GRID:grid.61971.38) (ISNI:0000 0004 1936 7494)
2 Kochi University, Department of Biological Sciences, Faculty of Science and Technology, Kochi, Japan (GRID:grid.278276.e) (ISNI:0000 0001 0659 9825)
3 National Taiwan University, Department of Geosciences, Taipei, Taiwan (GRID:grid.19188.39) (ISNI:0000 0004 0546 0241)
4 University of Granada, Department of Stratigraphy and Palaeontology, Granada, Spain (GRID:grid.4489.1) (ISNI:0000000121678994)
5 Stockholm University, Department of Physical Geography and Quaternary Geology, Stockholm, Sweden (GRID:grid.10548.38) (ISNI:0000 0004 1936 9377)
6 Academia Sinica, Institute of Earth Sciences, Taipei, Taiwan (GRID:grid.28665.3f) (ISNI:0000 0001 2287 1366)
7 University of Gothenburg, Department of Earth Sciences, Göteborg, Sweden (GRID:grid.8761.8) (ISNI:0000 0000 9919 9582)
8 Simon Fraser University, Department of Earth Sciences, Burnaby, Canada (GRID:grid.61971.38) (ISNI:0000 0004 1936 7494)