The plastic nervous system of Nemertodermatida

@article{Raikova2015ThePN,
  title={The plastic nervous system of Nemertodermatida},
  author={Olga I. Raikova and Inga Meyer-Wachsmuth and Ulf Jondelius},
  journal={Organisms Diversity \& Evolution},
  year={2015},
  volume={16},
  pages={85-104}
}
Nemertodermatida are microscopic marine worms likely to be the sister group to acoels, forming with them the earliest extant branch of bilaterian animals, although their phylogenetic position is debated. The nervous system of Flagellophora cf. apelti, Sterreria spp. and Nemertoderma cf. westbladi has been investigated by immunohistochemistry and confocal microscopy using anti-tubulin, anti-5-HT and anti-FMRFamide antibodies. The nervous system of F. cf. apelti is composed of a large neuropile… Expand

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References

SHOWING 1-10 OF 93 REFERENCES
Structure of the nervous system of Myzostoma cirriferum (Annelida) as revealed by immunohistochemistry and cLSM analyses
TLDR
Peripheral nerves and the commissures demonstrate a segmental organization of the nervous system of M. cirriferum, which exhibits several structures also found in the basic plan of the polychaete nervous system. Expand
The nervous system of Isodiametra pulchra (Acoela) with a discussion on the neuroanatomy of the Xenacoelomorpha and its evolutionary implications
TLDR
The nervous system of Isodiametra pulchra consists of an insunk, bilobed brain, a peripheral part for perception and innervation of the smooth body-wall musculature as well as tracts and motor neurons that together with pseudostriated inner muscles are responsible for steering and quick movements. Expand
Basiepidermal nervous system in Nemertoderma westbladi (Nemertodermatida): GYIRFamide immunoreactivity.
TLDR
The study demonstrates that the nemertodermatid NS possesses a number of plesiomorphic features and appears more primitive than the NS in other worms, except the Xenoturbellida. Expand
The brain of the Nemertodermatida (Platyhelminthes) as revealed by anti-5HT and anti-FMRFamide immunostainings.
TLDR
It is demonstrated that the Nemertodermatida have neither a 'commissural brain' structure similar to that of the Acoela, nor a 'true', ganglionic brain and orthogon, typical for other Platyhelminthes. Expand
An immunocytochemical and ultrastructural study of the nervous and muscular systems of Xenoturbella westbladi (Bilateria inc. sed.)
TLDR
The results are compatible with the hypothesis of Xenoturbella westbladi forming a sister taxon to Bilateria and the organisation of the nervous system appears very simple. Expand
The nervous system of Xenacoelomorpha: a genomic perspective
TLDR
A major focus of this research is the origin of ‘cephalized’ (centralized) nervous systems, and how complex brains are assembled from simpler neuronal arrays has been a matter of intense debate for at least 100 years using Xenacoelomorpha models. Expand
The muscular system of Nemertoderma westbladi and Meara stichopi (Nemertodermatida, Acoelomorpha)
TLDR
Musculature between the two species differs considerably and might give insights into the internal relationships of Nemertodermatida and might prove to be useful in studies investigating their phylogenetic position. Expand
Structure of the nervous system in the tornaria larva of Balanoglossus proterogonius (Hemichordata: Enteropneusta) and its phylogenetic implications
TLDR
Comparison with larvae in Echinodermata shows several significant differences in the way the larval nervous system is organized, which calls into question the homology between tornariae and echinODerm larvae. Expand
The nervous and muscular systems in the free-living flatworm Castrella truncata (Rhabdocoela): an immunocytochemical and phalloidin fluorescence study.
TLDR
An immunocytochemical study of the free-living flatworm Castrella truncata (Dalyellioida) has been performed, and staining of the muscular system with TRITC conjugated phalloidin revealed muscle patterns that have not been described previously. Expand
Comparative analysis of the nervous systems in presumptive progenetic dinophilid and dorvilleid polychaetes (Annelida) by immunohistochemistry and cLSM
TLDR
The Dinophilus nervous system with 12 longitudinal nerves and three perpendicular nerve rings per segment resembles orthogonal nervous structures characteristic of platyhelminths, and this result cannot support the view that dinophilids originate from dorvilleids. Expand
...
1
2
3
4
5
...