ArticleBMC evolutionary biology2016
Neural reconstruction of bone-eating Osedax spp. (Annelida) and evolution of the siboglinid nervous system.
Article in BMC evolutionary biology, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 12 papers.
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12 citing papers in PubMed.
- Faster and smaller: Heterochronic shift in gene expression leads to larval onset of spermatogenesis and miniaturized males.iScience · 2026Article
- Postembryonic development and male paedomorphosis inFrontiers in neuroscience · 2024Article
- Distinct genomic routes underlie transitions to specialised symbiotic lifestyles in deep-sea annelid worms.Nature communications · 2023Article
- Palps across the tree - the neuronal innervation and development of sensory head appendages in Annelida.Frontiers in neuroscience · 2023Article
- Histamine and gamma-aminobutyric acid in the nervous system of Pygospio elegans (Annelida: Spionidae): structure and recovery during reparative regeneration.BMC zoology · 2022Article
- Sensory cells and the organization of the peripheral nervous system of the siboglinid Oligobrachia haakonmosbiensis Smirnov, 2000.BMC zoology · 2022Article
- May the palps be with you - new insights into the evolutionary origin of anterior appendages in Terebelliformia (Annelida).BMC zoology · 2021Article
- Myogenesis of Siboglinum fiordicum sheds light on body regionalisation in beard worms (Siboglinidae, Annelida).Frontiers in zoology · 2021Article
- Within-family plasticity of nervous system architecture in Syllidae (Annelida, Errantia).Frontiers in zoology · 2020Article
- The neuroanatomy of the siboglinid Riftia pachyptila highlights sedentarian annelid nervous system evolution.PloS one · 2018Article
- Convergent evolution of the ladder-like ventral nerve cord in Annelida.Frontiers in zoology · 2018Article
- Molecular regionalization in the compact brain of the meiofaunal annelid Dinophilus gyrociliatus (Dinophilidae).EvoDevo · 2016Article
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3 authors.
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No grant is acknowledged in the PubMed record.
Abstract
backgroundBone-devouring Osedax worms were described over a decade ago from deep-sea whale falls. The gutless females (and in one species also the males) have a unique root system that penetrates the bone and nourishes them via endosymbiotic bacteria. Emerging from the bone is a cylindrical trunk, which is enclosed in a transparent tube, that generally gives rise to a plume of four palps (or tentacles). In most Osedax species, dwarf males gather in harems along the female's trunk and the nervous system of these microscopic forms has been described in detail. Here, the nervous system of bone-eating Osedax forms are described for the first time, allowing for hypotheses on how the abberant ventral brain and nervous system of Siboglinidae may have evolved from a ganglionated nervous system with a dorsal brain, as seen in most extant annelids.
resultsThe intraepidermal nervous systems of four female Osedax spp. and the bone-eating O. priapus male were reconstructed in detail by a combination of immunocytochemistry, CLSM, histology and TEM. They all showed a simple nervous system composed of an anterior ventral brain, connected with anteriorly directed paired palp and gonoduct nerves, and four main pairs of posteriorly directed longitudinal nerves (2 ventral, 2 ventrolateral, 2 sets of dorso-lateral, 2 dorsal). Transverse peripheral nerves surround the trunk, ovisac and root system. The nervous system of Osedax resembles that of other siboglinids, though possibly presenting additional lateral and dorsal longitudinal nerves. It differs from most Sedentaria in the presence of an intraepidermal ventral brain, rather than a subepidermal dorsal brain, and by having an intraepidermal nerve cord with several plexi and up to three main commissures along the elongated trunk, which may comprise two indistinct segments.
conclusionsOsedax shows closer neuroarchitectural resemblance to Vestimentifera + Sclerolinum (= Monilifera) than to Frenulata. The intraepidermal nervous system with widely separated nerve cords, double brain commissures, double palp nerves and other traits found in Osedax can all be traced to represent ancestral states of Siboglinidae. A broader comparison of the nervous system and body regions across Osedax and other siboglinids allows for a reinterpretation of the anterior body region in the group.
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