Fig. 6From: ‘Arm brains’ (axial nerves) of Jurassic coleoids and the evolution of coleoid neuroanatomyChondroteuthis wunnenbergi Bode, 1933, BGR MA 13436, Hondelage near Brunswick (Germany), Toarcian Posidonia Shale. a Arm crown, inverted white light photo by RH; arm hooks appear whitish, the axial nerves are dark. b Drawing after a. Pink—outlines of arms; black—arm hooks; light yellow—lightly phosphatized structures; grey—dark spots in the sedimentBack to article page