ArticleBMC evolutionary biology2015
A metameric origin for the annelid pygidium?
Article in BMC evolutionary biology, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 15 papers.
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Who cites it
15 citing papers in PubMed, 44 citations in OpenAlex.
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- A Fast And Versatile Method for Simultaneous HCR, Immunohistochemistry And Edu Labeling (SHInE).Integrative and comparative biology · 2023Article
- Sensory cells and the organization of the peripheral nervous system of the siboglinid Oligobrachia haakonmosbiensis Smirnov, 2000.BMC zoology · 2022Article
- Neural regulation of body polarities in nereid worm regeneration.FASEB bioAdvances · 2022Article
- Myogenesis of Siboglinum fiordicum sheds light on body regionalisation in beard worms (Siboglinidae, Annelida).Frontiers in zoology · 2021Article
- DNA methylation atlas and machinery in the developing and regenerating annelid Platynereis dumerilii.BMC biology · 2021Article
- Within-family plasticity of nervous system architecture in Syllidae (Annelida, Errantia).Frontiers in zoology · 2020Article
- Comparative Study of Pygidial Organization in Polychaetes of the Families Nephtyidae and Syllidae.Doklady biological sciences : proceedings of the Academy of Sciences of the USSR, Biological sciences sections · 2018Article
- Cell lineage and cell cycling analyses of the 4d micromere using live imaging in the marine annelideLife · 2017Article
- Article
- Development of the nervous system inFrontiers in zoology · 2017Article
- Report on the 13th symposium on invertebrate neurobiology held 26-30 August 2015 at the Balaton Limnological Institute, MTA Centre for ecological research of the Hungarian Academy of Sciences, Tihany, Hungary.Invertebrate neuroscience : IN · 2016Article
- Neural architecture of Galathowenia oculata Zach, 1923 (Oweniidae, Annelida).Frontiers in zoology · 2016Article
- The neuromuscular system ofEvoDevo · 2016Article
- Cambrian stem-group annelids and a metameric origin of the annelid head.Biology letters · 2015Article
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Authors and funding
6 authors at 2 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundSegmented body organizations are widely represented in the animal kingdom. Whether the last common bilaterian ancestor was already segmented is intensely debated. Annelids display broad morphological diversity but many species are among the most homonomous metameric animals. The front end (prostomium) and tail piece (pygidium) of annelids are classically described as non-segmental. However, the pygidium structure and development remain poorly studied.
resultsUsing different methods of microscopy, immunolabelling and a number of molecular markers, we describe the neural and mesodermal structures of the pygidium of Platynereis dumerilii. We establish that the pygidium possesses a complicated nervous system with a nerve ring and a pair of sensory ganglia, a complex intrinsic musculature, a large terminal circular blood sinus and an unusual unpaired torus-shaped coelomic cavity. We also describe some earlier steps of pygidial development and pygidial structure of mature animals after epitokous transformation.
conclusionsWe describe a much more complex organization of the pygidium of P. dumerilii than previously suggested. Many of the characteristics are strikingly similar to those found in the trunk segments, opening the debate on whether the pygidium and trunk segments derive from the same ancestral metameric unit. We analyze these scenarios in the context of two classical theories on the origin of segmentation: the cyclomeric/archicoelomate concept and the colonial theory. Both theories provide possible explanations for the partial or complete homology of trunk segments and pygidium.
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