Where is my mind? How sponges and placozoans may have lost neural cell types

Recent phylogenomic evidence suggests that ctenophores may be the sister group to the rest of animals. This phylogenetic arrangement opens the possibility that sponges and placozoans could have lost neural cell types or that the ctenophore nervous system evolved independently. We critically review e...

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Veröffentlicht in:Philosophical transactions of the Royal Society of London. Series B. Biological sciences 2015-12, Vol.370 (1684), p.20150059-20150059
Hauptverfasser: Ryan, Joseph F., Chiodin, Marta
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container_end_page 20150059
container_issue 1684
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container_title Philosophical transactions of the Royal Society of London. Series B. Biological sciences
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creator Ryan, Joseph F.
Chiodin, Marta
description Recent phylogenomic evidence suggests that ctenophores may be the sister group to the rest of animals. This phylogenetic arrangement opens the possibility that sponges and placozoans could have lost neural cell types or that the ctenophore nervous system evolved independently. We critically review evidence to date that has been put forth in support of independent evolution of neural cell types in ctenophores. We observe a reluctance in the literature to consider a lost nervous system in sponges and placozoans and suggest that this may be due to historical bias and the commonly misconstrued concept of animal complexity. In support of the idea of loss (or modification beyond recognition), we provide hypothetical scenarios to show how sponges and placozoans may have benefitted from the loss and/or modification of their neural cell types.
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source MEDLINE; JSTOR Archive Collection A-Z Listing; PubMed Central
subjects Animal Evolution
Animals
Biological Evolution
Ctenophora
Loss
Nervous System
Neurons - physiology
Placozoa
Placozoa - cytology
Porifera
Porifera - cytology
Review
title Where is my mind? How sponges and placozoans may have lost neural cell types
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