Monograph of the solenofilomorphidae (Turbellaria: Acoela)

Crezée, M.

doi:10.1002/iroh.19750600604

Cited by 46 publications

(44 citation statements)

References 14 publications

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“…(6) Replacement of the anterior ring-commissure by bilobed brain, with a dense neuropil, plus one to three anterior commissures. Nervous systems information from: X. westbladi (Raikova et al, 2000b;Israelsson, 2007); N. westbladi (Raikova et al, 2004b); D. gymnopharyngeus (Smith and Tyler, 1985); P. rubra (Crezée, 1978); H. miamia (Correa, 1960); S. funilis (Crezée, 1975); I. pulchra (Achatz and Martinez, 2012); S. roscoffensis (Bery et al, 2010;Bery and Martínez, 2011;Semmler et al, 2010) (current study). Adapted from a diagram in Achatz and Martinez (Achatz and Martinez, 2012).…”

Section: The Acoel Nervous System In Contextmentioning

confidence: 87%

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The nervous system of Xenacoelomorpha: a genomic perspective

Perea-Atienza

Gavilán

Chiodin

et al. 2015

Journal of Experimental Biology

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Xenacoelomorpha is, most probably, a monophyletic group that includes three clades: Acoela, Nemertodermatida and Xenoturbellida. The group still has contentious phylogenetic affinities; though most authors place it as the sister group of the remaining bilaterians, some would include it as a fourth phylum within the Deuterostomia. Over the past few years, our group, along with others, has undertaken a systematic study of the microscopic anatomy of these worms; our main aim is to understand the structure and development of the nervous system. This research plan has been aided by the use of molecular/developmental tools, the most important of which has been the sequencing of the complete genomes and transcriptomes of different members of the three clades. The data obtained has been used to analyse the evolutionary history of gene families and to study their expression patterns during development, in both space and time. A major focus of our research is the origin of 'cephalized' (centralized) nervous systems. How complex brains are assembled from simpler neuronal arrays has been a matter of intense debate for at least 100 years. We are now tackling this issue using Xenacoelomorpha models. These represent an ideal system for this work because the members of the three clades have nervous systems with different degrees of cephalization; from the relatively simple sub-epithelial net of Xenoturbella to the compact brain of acoels. How this process of 'progressive' cephalization is reflected in the genomes or transcriptomes of these three groups of animals is the subject of this paper.

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Section: The Acoel Nervous System In Contextmentioning

confidence: 87%

“…In the latter group, the nervous system is organized in one to three ring commissures plus eight neurite bundles ( Fig. 1) (Crezée, 1975). The sister group of Prosopharyngida is Crucimusculata (Jondelius et al, 2011), a clade that includes all the named 'higher acoels'.…”

Section: The Acoel Nervous System In Contextmentioning

confidence: 99%

The nervous system of Xenacoelomorpha: a genomic perspective

Perea-Atienza

Gavilán

Chiodin

et al. 2015

Journal of Experimental Biology

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“…The NS in the Solenofilomorphidae is located below the body wall musculature and consists, close to the statocyst, of one to three commissures in the anterior part; these animals possess eight longitudinal neurite bundles that run along the body of the animal. The neurite bundles have two different spatial distributions: those that are clearly separated from the epidermis; and those that are associated with the epidermis (especially in the case of the dorsolateral and the ventrolateral neurite bundles) [6,57].…”

Section: Comparative Analysis Of Xenacoelomorpha Nervous System Morphmentioning

confidence: 99%

Xenacoelomorpha: a case of independent nervous system centralization?

Gavilán

Perea-Atienza

Martı́nez

2016

Phil. Trans. R. Soc. B

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One contribution of 16 to a discussion meeting issue 'Homology and convergence in nervous system evolution'. Centralized nervous systems (NSs) and complex brains are among the most important innovations in the history of life on our planet. In this context, two related questions have been formulated: How did complex NSs arise in evolution, and how many times did this occur? As a step towards finding an answer, we describe the NS of several representatives of the Xenacoelomorpha, a clade whose members show different degrees of NS complexity. This enigmatic clade is composed of three major taxa: acoels, nemertodermatids and xenoturbellids. Interestingly, while the xenoturbellids seem to have a rather 'simple' NS (a nerve net), members of the most derived group of acoel worms clearly have ganglionic brains. This interesting diversity of NS architectures (with different degrees of compaction) provides a unique system with which to address outstanding questions regarding the evolution of brains and centralized NSs. The recent sequencing of xenacoelomorph genomes gives us a privileged vantage point from which to analyse neural evolution, especially through the study of key gene families involved in neurogenesis and NS function, such as G protein-coupled receptors, helixloop-helix transcription factors and Wnts. We finish our manuscript proposing an adaptive scenario for the origin of centralized NSs (brains).

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“…To date, there is only one species of acoel known from Baja California, Mexico, Solenofilomorpha guaymensis Crezée, 1975, an interstitial species collected subtidally from Guaymas, Sonora (Crezée 1975, see also Tyler et al 2005). As part of an ongoing investigation of the taxonomy and biogeography of the Acoela (Hooge 2003, Hooge & Smith 2004, Hooge & Tyler 2001, 2003a,b, 2005, we collected acoels from San Felipe Bay, Baja, Mexico in February 2004.…”

Section: Introductionmentioning

confidence: 99%