蛇紋岩巻き貝 3Dモデル

Name of the model: " Serpenticone Conch Smooth" Format: STL Triangles: 1387578 Vertices: 693790 Information: This model emulates a serpenticonic conch with a smooth shell surface (ribs and nodes). According to Westermann (1996) Serpenticonic shells are evolute, with much of the umbilicus exposed. This has been shown to generate excessive drag against propulsion (Jacobs 1992). The shell form is overall fairly compressed, even if the aperture itself is not compressed. The venter does not produce as much drag, and at larger sizes, less energy would be required for propulsion because turbulent flow would de-emphasize friction drag along the umbilicus (Jacobs 1992). References: Jacobs DK. 1992. Shape, Drag, and Power in Ammonoid Swimming. Paleobiology 18: 203-220. Westermann GEG. 1996. Ammonoid Life and Habitat. Pages 607-707 in Landman NH, Tanabe K, Davis RA, eds. Ammonoid Paleobiology. Boston, MA: Springer US.