Suture (anatomy)
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In anatomy, a suture is a fairly rigid joint between two or more hard elements of an organism, with or without significant overlap of the elements.
A variety of ammonite forms, from Ernst Haeckel's 1904 Kunstformen der Natur (Artforms of Nature).
Two shells of Papillifera bidens, scale bar is in mm. These shells have 10 or 11 whorls and thus a very long suture, with an unusual sculpture of regularly placed papules along the suture itself.
Gaza daedala
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Gaza daedala is a species of sea snail, a marine gastropod mollusc in the family Margaritidae.
Gaza daedala
Drawing of apertural and apical view of a shell of Gaza daedala.