Cookie cutter shark12/24/2022 ![]() ![]() Physically it looks like a typical dogfish, with a long thin body, a short cone-shaped snout, and no anal fin. This group in turn belongs to Order Squaliformes, the Dogfish Sharks. Preliminary analyses for the cookie cutter shark indicate that jaw stress and strain energy are 1) lower during rotational biting than during normal biting, and 2) lower when fused functional and replacement teeth are present, suggesting structural adaptation for the unique feeding niche occupied by this shark. The Cookiecutter Shark (Isistius brasiliensis) is a member of the Sleeper Shark family, Dalatiidae. FE simulations were run to determine jaw performance during normal biting (i.e., forces applied perpendicular to the jaw surface) and rotational biting (i.e., forces applied parallel to the jaw surface), and jaw stress and strain energy were determined. Models for both species were then virtually manipulated to represent all possible character states, resulting in 7 models per species (jaws, jaws + fused/unfused functional teeth, jaws + fused/unfused replacement teeth, jaws + fused/unfused functional teeth + fused/unfused replacement teeth). To identify the extent to which these unique anatomical attributes facilitate their unique feeding niche, Finite Element (FE) models of the jaws of the large tooth cookie cutter shark Isistius plutodus and spiny dogfish Squalus acanthias were developed from CT scans the spiny dogfish represents a generalized shark feeding mechanism for comparison. Their semi-circular, scoop-shaped lower jaw bears teeth fused into a saw blade, which is used to excise circular flesh plugs from large fishes and marine mammals via longitudinal rotation of the body. The University of Tampa California State University Long Beach National Oceanic and Atmospheric Administration University of South Florida University of South Florida exhibit a wide array of feeding mechanisms, behaviors, and ecologies, among which the cookie cutter sharks (Isistius spp.) are rather unique. 4 15:30 – 17:30 Structural Mechanics of Cookie Cutter Shark Jaws HUBER, D.* TRAVIS, K. ![]()
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