The neuroanatomy of the siboglinid Riftia pachyptila highlights sedentarian annelid nervous system evolution.

ABSTRACT: Tracing the evolution of the siboglinid group, peculiar group of marine gutless annelids, requires the detailed study of the fragmentarily explored central nervous system of vestimentiferans and other siboglinids. 3D reconstructions of the neuroanatomy of Riftia revealed that the "brain" of adult vestimentiferans is a fusion product of the supraesophageal and subesophageal ganglia. The supraesophageal ganglion-like area contains the following neural structures that are homologous to the annelid elements: the peripheral perikarya of the brain lobes, two main transverse commissures, mushroom-like structures, commissural cell cluster, and the circumesophageal connectives with two roots which give rise to the palp neurites. Three pairs of giant perikarya are located in the supraesophageal gang

SUBMITTER: Rimskaya-Korsakova NN 

PROVIDER: S-EPMC6292602 | biostudies-literature | 2018

REPOSITORIES: biostudies-literature