Nuchal Organ

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María Capa - One of the best experts on this subject based on the ideXlab platform.

  • Developmental studies provide new insights into the evolution of sense Organs in Sabellariidae (Annelida)
    BMC Evolutionary Biology, 2018
    Co-Authors: Conrad Helm, Michael J Bok, Pat Hutchings, Elena Kupriyanova, María Capa
    Abstract:

    Background Sabellarids, also known as honeycomb or sandcastle worms, when building their tubes, produce chemical signals (free fatty acids) that are responsible for larval settlement and the formation of three-dimensional aggregations. The larval palps and the dorsal hump (becoming the median Organ in adults) are presumed to participate in such a substrate selection during settlement. Notably, the sabellariid median Organ is an apparently unique Organ among annelids that has been attributed with a sensory function and perhaps with some affinities to the Nuchal Organs of other polychaetes. Nevertheless, detailed investigations of this prominent character complex including ultrastructural examinations are lacking so far. Results Our comprehensive investigations provide data about the anterior sensory Organs in Sabellariidae and inform about their transformation during pelagic larval development. We used a comparative approach including immunostaining with subsequent confocal laser scanning microscopy (clsm), histological sections as well as electron microscopy in a range of larval and adult stages of two sabellariid species. We find that the neuronal innervation as well as the ultrastructure of the sabellariid ciliary structures along the median Organ are highly comparable with that of Nuchal Organs known from other polychaetes. Furthermore, the myoinhibitory protein (MIP) – a protein known to be also involved into chemo-sensation - was detected in the region of the larval median Organ. Moreover, we reveal the presence of an unusual type of photoreceptor as part of the median Organ in Idanthyrsus australiensis with a corrugated sensory membrane ultrastructure unlike those observed in the segmental ocelli of other polychaetes. Conclusions We are describing for the first time the Nuchal Organ-like structures in different developmental stages of two species of Sabellariidae. The external morphology, neuronal innervation, developmental fate and ultrastructure of the newly-discovered median Organ-based ciliary pits are comparable with the characteristics known for annelid Nuchal Organs and therefore indicate a homology of both sensory complexes. The presence of myoinhibitory peptide (MIP) in the respective region supports such a hypothesis and exhibits the possibility of an involvement of the entire sabellariid median Organ complex, and in particular the prominent ciliated pits, in chemo-sensation.

  • Developmental studies provide new insights into the evolution of sense Organs in Sabellariidae (Annelida)
    BMC evolutionary biology, 2018
    Co-Authors: Conrad Helm, Michael J Bok, Pat Hutchings, Elena Kupriyanova, María Capa
    Abstract:

    Sabellarids, also known as honeycomb or sandcastle worms, when building their tubes, produce chemical signals (free fatty acids) that are responsible for larval settlement and the formation of three-dimensional aggregations. The larval palps and the dorsal hump (becoming the median Organ in adults) are presumed to participate in such a substrate selection during settlement. Notably, the sabellariid median Organ is an apparently unique Organ among annelids that has been attributed with a sensory function and perhaps with some affinities to the Nuchal Organs of other polychaetes. Nevertheless, detailed investigations of this prominent character complex including ultrastructural examinations are lacking so far. Our comprehensive investigations provide data about the anterior sensory Organs in Sabellariidae and inform about their transformation during pelagic larval development. We used a comparative approach including immunostaining with subsequent confocal laser scanning microscopy (clsm), histological sections as well as electron microscopy in a range of larval and adult stages of two sabellariid species. We find that the neuronal innervation as well as the ultrastructure of the sabellariid ciliary structures along the median Organ are highly comparable with that of Nuchal Organs known from other polychaetes. Furthermore, the myoinhibitory protein (MIP) – a protein known to be also involved into chemo-sensation - was detected in the region of the larval median Organ. Moreover, we reveal the presence of an unusual type of photoreceptor as part of the median Organ in Idanthyrsus australiensis with a corrugated sensory membrane ultrastructure unlike those observed in the segmental ocelli of other polychaetes. We are describing for the first time the Nuchal Organ-like structures in different developmental stages of two species of Sabellariidae. The external morphology, neuronal innervation, developmental fate and ultrastructure of the newly-discovered median Organ-based ciliary pits are comparable with the characteristics known for annelid Nuchal Organs and therefore indicate a homology of both sensory complexes. The presence of myoinhibitory peptide (MIP) in the respective region supports such a hypothesis and exhibits the possibility of an involvement of the entire sabellariid median Organ complex, and in particular the prominent ciliated pits, in chemo-sensation.

Capa María - One of the best experts on this subject based on the ideXlab platform.

  • Developmental studies provide new insights into the evolution of sense Organs in Sabellariidae (Annelida)
    BMC (part of Springer Nature), 2018
    Co-Authors: Helm Conrad, Hutchings Pat, Bok, Michael J, Kupriyanova Elena, Capa María
    Abstract:

    Background Sabellarids, also known as honeycomb or sandcastle worms, when building their tubes, produce chemical signals (free fatty acids) that are responsible for larval settlement and the formation of three-dimensional aggregations. The larval palps and the dorsal hump (becoming the median Organ in adults) are presumed to participate in such a substrate selection during settlement. Notably, the sabellariid median Organ is an apparently unique Organ among annelids that has been attributed with a sensory function and perhaps with some affinities to the Nuchal Organs of other polychaetes. Nevertheless, detailed investigations of this prominent character complex including ultrastructural examinations are lacking so far. Results Our comprehensive investigations provide data about the anterior sensory Organs in Sabellariidae and inform about their transformation during pelagic larval development. We used a comparative approach including immunostaining with subsequent confocal laser scanning microscopy (clsm), histological sections as well as electron microscopy in a range of larval and adult stages of two sabellariid species. We find that the neuronal innervation as well as the ultrastructure of the sabellariid ciliary structures along the median Organ are highly comparable with that of Nuchal Organs known from other polychaetes. Furthermore, the myoinhibitory protein (MIP) – a protein known to be also involved into chemo-sensation - was detected in the region of the larval median Organ. Moreover, we reveal the presence of an unusual type of photoreceptor as part of the median Organ in Idanthyrsus australiensis with a corrugated sensory membrane ultrastructure unlike those observed in the segmental ocelli of other polychaetes. Conclusions We are describing for the first time the Nuchal Organ-like structures in different developmental stages of two species of Sabellariidae. The external morphology, neuronal innervation, developmental fate and ultrastructure of the newly-discovered median Organ-based ciliary pits are comparable with the characteristics known for annelid Nuchal Organs and therefore indicate a homology of both sensory complexes. The presence of myoinhibitory peptide (MIP) in the respective region supports such a hypothesis and exhibits the possibility of an involvement of the entire sabellariid median Organ complex, and in particular the prominent ciliated pits, in chemo-sensation.publishedVersion© The Author(s). 2018 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/

  • Developmental studies provide new insights into the evolution of sense Organs in Sabellariidae (Annelida)
    'Springer Science and Business Media LLC', 2018
    Co-Authors: Helm Conrad, Hutchings Pat, Bok, Michael J, Kupriyanova, Elena K., Capa María
    Abstract:

    [Background] Sabellarids, also known as honeycomb or sandcastle worms, when building their tubes, produce chemical signals (free fatty acids) that are responsible for larval settlement and the formation of three-dimensional aggregations. The larval palps and the dorsal hump (becoming the median Organ in adults) are presumed to participate in such a substrate selection during settlement. Notably, the sabellariid median Organ is an apparently unique Organ among annelids that has been attributed with a sensory function and perhaps with some affinities to the Nuchal Organs of other polychaetes. Nevertheless, detailed investigations of this prominent character complex including ultrastructural examinations are lacking so far.[Results] Our comprehensive investigations provide data about the anterior sensory Organs in Sabellariidae and inform about their transformation during pelagic larval development. We used a comparative approach including immunostaining with subsequent confocal laser scanning microscopy (clsm), histological sections as well as electron microscopy in a range of larval and adult stages of two sabellariid species. We find that the neuronal innervation as well as the ultrastructure of the sabellariid ciliary structures along the median Organ are highly comparable with that of Nuchal Organs known from other polychaetes. Furthermore, the myoinhibitory protein (MIP) – a protein known to be also involved into chemo-sensation - was detected in the region of the larval median Organ. Moreover, we reveal the presence of an unusual type of photoreceptor as part of the median Organ in Idanthyrsus australiensis with a corrugated sensory membrane ultrastructure unlike those observed in the segmental ocelli of other polychaetes.[Conclusions] We are describing for the first time the Nuchal Organ-like structures in different developmental stages of two species of Sabellariidae. The external morphology, neuronal innervation, developmental fate and ultrastructure of the newly-discovered median Organ-based ciliary pits are comparable with the characteristics known for annelid Nuchal Organs and therefore indicate a homology of both sensory complexes. The presence of myoinhibitory peptide (MIP) in the respective region supports such a hypothesis and exhibits the possibility of an involvement of the entire sabellariid median Organ complex, and in particular the prominent ciliated pits, in chemo-sensation.CH was financed by a personal research fellowship (“Rückkehrerstipendium”) from the DFG (HE 7224/2–1). MC was financed by ForBio – the Research School in Biosystematics, funded by the Norwegian Taxonomy Initiative (70184215), the Research Council of Norway (248799) and the Ramón y Cajal program (RYC-2016-20799) funded by Spanish Ministerio de Economía, Industria y Competitividad, Agencia Estatal de Investigación, Comunidad Autónoma de las Islas Baleares and the European Social Fund. The European Commission Taxonomic Initiative SYNTHESYS (ES-TAF-7033) financed a visit to Museo Nacional de Ciencias Naturales, Madrid, Spain. MJB is supported by the Biotechnology and Biological Sciences Research Council (BBSRC, BB/P011357/1) and the Knut and Alice Wallenberg Foundation and the Swedish Research Council (grants awarded to Dan-Eric Nilsson).Peer reviewe

  • Figure 5 from: Capa M, Osborn KJ, Bakken T (2016) Sphaerodoridae (Annelida) of the deep Northwestern Atlantic, including remarkable new species of Euritmia and Sphaerephesia. ZooKeys 615: 1-32. https://doi.org/10.3897/zookeys.615.9530
    2016
    Co-Authors: Capa María, Osborn, Karen J., Bakken Torkild
    Abstract:

    Figure 5 - Sphaerephesia amphorata sp. n., paratypes, USNM 1002041, SEM. A Whole specimen, dorsal view B Same, ventral view C Anterior end, showing head appendages, dorsal view D Same, with head papillae visible E Same, lateroventral view; mouth and Nuchal Organ pits, visible F Anterior end, ventral view G Posterior chaetigers, dorsal view, showing the characteristic dorsal macrotubercles with long terminal papillae H Mid-body chaetigers, ventral view. Abbreviations: lateral antenna; ma, median antenna; mo, mouth; no, Nuchal Organ; pa, palp; tc, tentacular cirrus

  • Figure 2 from: Capa M, Osborn KJ, Bakken T (2016) Sphaerodoridae (Annelida) of the deep Northwestern Atlantic, including remarkable new species of Euritmia and Sphaerephesia. ZooKeys 615: 1-32. https://doi.org/10.3897/zookeys.615.9530
    2016
    Co-Authors: Capa María, Osborn, Karen J., Bakken Torkild
    Abstract:

    Figure 2 - Ephesiopsis guayanae, USNM 1001777, SEM. A Whole specimen, side view B Anterior end, side view C Chaetiger 3, with parapodia, macrotubercle and microtubercle, side view D Mid-body segments, side view E Mid-body parapodium showing detail of parapodial papillae, acicular lobe and ventral cirrus F Posterior chaetigers and pygidium with paired dorsal cirri and ventral digitiform anal cirrus, side view G Chaetae chaetiger 4 H Chaetae mid-body fascicle I–L Chaetae mid-body chaetigers. Abbreviations: 1st mc, macrotubercle from first chaetiger; al, acicular lobe; la, lateral antenna; ma, median antenna; mc, macrotubercle; mi, microtubercle; mo, mouth; no, Nuchal Organ; pa, palp; tc, tentacular cirrus; vc, ventral cirrus

Blake, James A. - One of the best experts on this subject based on the ideXlab platform.

Bick Andreas - One of the best experts on this subject based on the ideXlab platform.

  • FIGURE 8 in Spionidae (Polychaeta: Canalipalpata: Spionida) from seamounts in the NE Atlantic
    2014
    Co-Authors: Bick Andreas, Guggolz Theresa, Götting Miriam
    Abstract:

    FIGURE 8. Dipolydora paracaulleryi sp. nov.: A. Anterior end until chaetiger 6, dorsal view; palps lost; arrow indicating right Nuchal Organ. B. Anterior end, dorsolateral view; palps lost. C. Chaetigers 4 and 5, left side, lateral view. D. Chaetigers (3)4– 8(9), dorsal view; arrow indicating unidentate falcate spines at the left side in chaetiger 5, also note start of branchiae on chaetiger 7.—All from Great Meteor Seamount (A–D ZSRO-P2304, paratype), Scale: A, B, D 100 µm, C 30 µm

  • FIGURE 3 in Spionidae (Polychaeta: Canalipalpata: Spionida) from seamounts in the NE Atlantic
    2014
    Co-Authors: Bick Andreas, Guggolz Theresa, Götting Miriam
    Abstract:

    FIGURE 3. Aonidella cf. dayi Maciolek in López-Jamar, 1989: A. Anterior end, dorsolateral view; palps lost. B. Anterior end, dorsal view; palps lost; upper arrow indicating left Nuchal Organ, lower arrow indicating enlarged notopodial lamella on chaetiger two, left side. C. Anterior end, lateral view. D. Midbody region, interparapodial lateral pouches absent, dorsolateral view. E. Midbody region further posterior to image D, neuropodial hooks present in anterior row accompanied by posterior row of capillaries, anterolateral view. F. Hooded hook with pair of small, somewhat perpendicular apical teeth above main fang, from neuropodium of chaetiger 25. G. Posterior end, parapodia with cirriform postchaetal lamellae and hooks present in anterior rows in neuro- and notopodia, oblique view.—All from Great Meteor Seamount (A–C ZSRO-P2329, D–G ZMH- P27565), Scale: A–C, G 100 µm, D 40 µm, E 20 µm, F 1 µm

  • FIGURE 12 in On the identity of Spio filicornis (O. F. Müller, 1776) — with the designation of a neotype, and the description of two new species from the North East Atlantic Ocean based on morphological and genetic studies
    2011
    Co-Authors: Bick Andreas, Bastrop Ralf
    Abstract:

    FIGURE 12. Spio symphyta sp. nov.: A. Anterior end, dorsal view. B. Anterior dorsum, dorsal view. C. Anterior end, dorsal view; Nuchal Organ and dorsal ciliated Organs well observable in specimen stained with methyl green. D. Neuropodial hooks from chaetiger 20, lateral view. E. Neuropodial hook from 18th last chaetiger, anterior oblique view; arrow points at uppermost 3rd tooth. F. Anteriormost region, dorsal view; arrow points at fusion between prostomium and peristomium; specimen stained with methyl green. G. Ventrum of chaetigers 13–15, with pattern of white dots (arrows) discernible in specimen stained with methyl green. — A, B (without number, 53°43.941N, 6°31.310E, 23.9 m, 23.07.2008), C, F (ZMH P-25911), D (ZSRO- P2065), E (ZSRO-P2063), G (ZSRO-P1862)

  • (Table 1) Diagnostic characters of specimens of Marenzelleria bastropi sp. n., M. arctia, M. neglecta, M. viridis and M. wireni
    PANGAEA, 2005
    Co-Authors: Bick Andreas
    Abstract:

    Marenzelleria bastropi, a new species of Spionidae (Polychaeta) from the brackish water Currituck Sound, North Carolina, is described. The new species is characterized by the great number of chaetigers between the first neuro- and notopodial hooded hooks, the extension of the Nuchal Organ up to the end of chaetiger 2/middle of chaetiger 3 and the presence of about 60-90 branchiate chaetigers. Marenzelleria bastropi sp. nov. is closely related to M. neglecta (Sikorski and Bick, 2004) and Marenzelleria viridis (Verrill, 1873). Marenzelleria wireni Augener, 1913 is described here for the first time from western Spitsbergen. Adult specimens are investigated and compared with specimens from other areas of distribution. A key for subadult and adult specimens of all Marenzelleria species is provided

Conrad Helm - One of the best experts on this subject based on the ideXlab platform.

  • Developmental studies provide new insights into the evolution of sense Organs in Sabellariidae (Annelida)
    BMC Evolutionary Biology, 2018
    Co-Authors: Conrad Helm, Michael J Bok, Pat Hutchings, Elena Kupriyanova, María Capa
    Abstract:

    Background Sabellarids, also known as honeycomb or sandcastle worms, when building their tubes, produce chemical signals (free fatty acids) that are responsible for larval settlement and the formation of three-dimensional aggregations. The larval palps and the dorsal hump (becoming the median Organ in adults) are presumed to participate in such a substrate selection during settlement. Notably, the sabellariid median Organ is an apparently unique Organ among annelids that has been attributed with a sensory function and perhaps with some affinities to the Nuchal Organs of other polychaetes. Nevertheless, detailed investigations of this prominent character complex including ultrastructural examinations are lacking so far. Results Our comprehensive investigations provide data about the anterior sensory Organs in Sabellariidae and inform about their transformation during pelagic larval development. We used a comparative approach including immunostaining with subsequent confocal laser scanning microscopy (clsm), histological sections as well as electron microscopy in a range of larval and adult stages of two sabellariid species. We find that the neuronal innervation as well as the ultrastructure of the sabellariid ciliary structures along the median Organ are highly comparable with that of Nuchal Organs known from other polychaetes. Furthermore, the myoinhibitory protein (MIP) – a protein known to be also involved into chemo-sensation - was detected in the region of the larval median Organ. Moreover, we reveal the presence of an unusual type of photoreceptor as part of the median Organ in Idanthyrsus australiensis with a corrugated sensory membrane ultrastructure unlike those observed in the segmental ocelli of other polychaetes. Conclusions We are describing for the first time the Nuchal Organ-like structures in different developmental stages of two species of Sabellariidae. The external morphology, neuronal innervation, developmental fate and ultrastructure of the newly-discovered median Organ-based ciliary pits are comparable with the characteristics known for annelid Nuchal Organs and therefore indicate a homology of both sensory complexes. The presence of myoinhibitory peptide (MIP) in the respective region supports such a hypothesis and exhibits the possibility of an involvement of the entire sabellariid median Organ complex, and in particular the prominent ciliated pits, in chemo-sensation.

  • Developmental studies provide new insights into the evolution of sense Organs in Sabellariidae (Annelida)
    BMC evolutionary biology, 2018
    Co-Authors: Conrad Helm, Michael J Bok, Pat Hutchings, Elena Kupriyanova, María Capa
    Abstract:

    Sabellarids, also known as honeycomb or sandcastle worms, when building their tubes, produce chemical signals (free fatty acids) that are responsible for larval settlement and the formation of three-dimensional aggregations. The larval palps and the dorsal hump (becoming the median Organ in adults) are presumed to participate in such a substrate selection during settlement. Notably, the sabellariid median Organ is an apparently unique Organ among annelids that has been attributed with a sensory function and perhaps with some affinities to the Nuchal Organs of other polychaetes. Nevertheless, detailed investigations of this prominent character complex including ultrastructural examinations are lacking so far. Our comprehensive investigations provide data about the anterior sensory Organs in Sabellariidae and inform about their transformation during pelagic larval development. We used a comparative approach including immunostaining with subsequent confocal laser scanning microscopy (clsm), histological sections as well as electron microscopy in a range of larval and adult stages of two sabellariid species. We find that the neuronal innervation as well as the ultrastructure of the sabellariid ciliary structures along the median Organ are highly comparable with that of Nuchal Organs known from other polychaetes. Furthermore, the myoinhibitory protein (MIP) – a protein known to be also involved into chemo-sensation - was detected in the region of the larval median Organ. Moreover, we reveal the presence of an unusual type of photoreceptor as part of the median Organ in Idanthyrsus australiensis with a corrugated sensory membrane ultrastructure unlike those observed in the segmental ocelli of other polychaetes. We are describing for the first time the Nuchal Organ-like structures in different developmental stages of two species of Sabellariidae. The external morphology, neuronal innervation, developmental fate and ultrastructure of the newly-discovered median Organ-based ciliary pits are comparable with the characteristics known for annelid Nuchal Organs and therefore indicate a homology of both sensory complexes. The presence of myoinhibitory peptide (MIP) in the respective region supports such a hypothesis and exhibits the possibility of an involvement of the entire sabellariid median Organ complex, and in particular the prominent ciliated pits, in chemo-sensation.

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