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Larger diameters are typical of invertebrates and are nonmylenated
Invertebrates
Cuttlefish (Sepia sp.) 200 micron Large central fibers
Squid (Loligo sp.) 400 micron Large central fibers
(Both used in early nerve research)
Crab 100 to 250 micron Central fiber
Lobster 60 to 90 micron Leg axons
Earthworms 40 to 90 micron
Cockroach 50 micron Central fiber
Vertebrates
Carp 20 micron Lateral neuron
Human 10 to 20 micron Mylenated - to/from skeletal muscle
0.3 to 1.3 Nonmylenated - deep pain
Data from Rainer Flindt, Amazing Numbers in Biology,2003. (More specific citations within.)
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