Editing Myelin (section)

==Invertebrates==
Functionally equivalent myelin-like sheaths are found in several invertebrate taxa, including [[oligochaete]] annelids, and crustacean taxa such as [[penaeid]]s, [[palaemonid]]s, and [[calanoid]]s. These myelin-like sheaths share several structural features with the sheaths found in vertebrates including multiplicity of membranes, condensation of membrane, and nodes.<ref name="Daniel" /> However, the nodes in vertebrates are annular; i.e. they encircle the axon. In contrast, nodes found in the sheaths of invertebrates are either annular or fenestrated; i.e. they are restricted to "spots". The fastest recorded conduction speed (across both vertebrates and invertebrates) is found in the ensheathed axons of the [[Marsupenaeus|Kuruma shrimp]], an invertebrate,<ref name="Daniel" /> ranging between 90 and 200&nbsp;m/s<ref name="Salzer">{{cite journal|vauthors=Salzer JL, Zalc B|title=Myelination|journal=Current Biology|volume=26|issue=20|pages=R971–75|date=October 2016|pmid=27780071|doi=10.1016/j.cub.2016.07.074|url=http://hal.upmc.fr/hal-01390042/file/Salzer_2016_Myelination.pdf|doi-access=free|bibcode=2016CBio...26.R971S }}</ref> ([[cf.]] 100–120&nbsp;m/s for the fastest myelinated vertebrate axon).