Shells

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Summary so far… It is clear that there is a ʻmemoryʼ: the new state is determined by previous states. The simplest way to read this memory is via the shell itself, either pigment or shape. Pigment and shape serve to mark the shell margin, without which growth of the shell could not be regulated (Bauchau). Has the advantage of being clocked to the act of shell deposition rather than any internal or external synchronizer that is easily interruptible (tides, weather, etc.) 12 12
Shell anatomy Inner Outer Epitheli Middle Polyaxial Periostracal groove C ircum pallial axon Pigm ent sensing cells shell Extrapallial space Secretory gland cells D orsal epithelium Pallial nerves Ventral epithelium 13 Westerman et al. (2005)J. Morphology 264 13
Page 1 and 2: The neural origins of sea shell pat
Page 3 and 4: Shapes ANGULATE WENTELTRAP PINK MOU
Page 5 and 6: What purpose is the pigment Most sp
Page 7 and 8: Model for neurosecretion of shell a
Page 9 and 10: Reduction to simpler models Discret
Page 11: Experimental foundations Richly inn
Page 15 and 16: The model can ‘grow’ shells dyn
Page 17 and 18: All shell patterns are generated fr
Page 19 and 20: Turing instablity → Stripes Pigme
Page 21 and 22: Excitable → Waves C. vicweei C. c
Page 23 and 24: Triangle patterns arise from wave c
Page 25 and 26: The role of shell geometry 24 24
Page 27 and 28: Bifurcations separate different pat
Page 29 and 30: Cowries require a 2-D model 28 28
Page 31 and 32: What’s next: the amazing cuttlefi

Shells

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