English: Arm hook of Triassic phragmoteuthid, Phragmoteuthis bisinuata.
References
Doguzhaeva, L.; Summesberger, H.; Mutvei, H.; Brandstaetter, F. (2007). "The mantle, ink sac, ink, arm hooks and soft body debris associated with the shells in Late Triassic coleoid cephalopod Phragmoteuthis from the Austrian Alps". Palaeoworld16 (4): 272–284. DOI:10.1016/j.palwor.2007.08.002.
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