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  • 1
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    Larval development and the formation of the gut of Siboglinum poseidoni Flügel & Langhof (Pogonophora, Perviata). Evidence of protostomian affinity (1995)
    Taylor & Francis
    In:  Sarsia, 80 (2). pp. 73-89.
    Details
    Publication Date: 2018-08-15
    Description: Larvae of Siboglinum poseidoni were reared in the laboratory. About 6 weeks after recovery from the central Skagerrak the larvae develop a small tentacular bud. On the opposite side a stomodaeum is formed. Electron microscopy of suitable sections shortly in front of the tentacular bud reveals a ciliated opening and tract. In the trunk this tract is reduced to a small tube by bulging endoderm cells containing large amounts of yolk. The lumen is obscured by densely packed cilia. In more advanced stages extracellular symbiotic bacteria occur within this transient digestive tract. They appear to be taken in via the transient mouth. As development progresses the mouth and ciliated foregut close. In the trunk of adult specimens the space between the dorsal and the ventral vessel is occupied by bacteriocytes forming the trophosome. The lumen ofthe digestive tract is reduced to small ciliated spaces. The tentacle develops opposite to the transient mouth and hence dorsally, while the main nerve trunk is ventral. More advanced larval stages closely resemble an elongated annelidian metatrochophora. A relationship between Vestimentifera (Obturata) and Pogonophora (Perviata) is confirmed and the placement of both groups within the phylum Annelida suggested.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1080/00364827.1995.10413582
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    Unknown
    A new species of the genusSiboglinum(Pogonophora) from the North Atlantic off Portugal (1993)
    Taylor & Francis
    In:  Sarsia, 78 (3-4). pp. 255-264.
    Details
    Publication Date: 2018-03-05
    Description: A new species of Siboglinum is reported from off the Tejo mouth, Portugal. It was dredged from c. 1100 m. It resembles S. atlanticum and certain other species, in having paired white glandular stripes on the forepart. In the posterior trunk region we found small gram-negative internal symbiotic bacteria. All described species of the genus Siboglinum are equipped with a single tentacle, but one of our specimens bears two tentacles.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1080/00364827.1993.10413539
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Unknown
    New observations on the biology ofSiboglinum poseidoniFlügel & Langhof (Pogonophora) from the Skagerrak (1992)
    Taylor & Francis
    In:  Sarsia, 77 (3-4). pp. 287-290.
    Details
    Publication Date: 2018-03-20
    Description: Specimens of Siboglinum poseidon were collected by box coring and studied together with their undisturbed habitat. Occupied tubes occur in depse aggregations beneath the sediment surface directly at methane seep sites. Fertilized eggs develop into small larvae within the anterior transparent region of the tube. The oldest larvae observed in tubes measure c. 370 µm in length. It is concluded that released larvae develop in the sediment in the oxygenated top layer. Three tube types have been found: 1, the larval envelope; 2, the juvenile, transparent tube and 3, the ringed, adult tube. The smallest specimens recovered from the sediment measure c. 2 mm. They are complete with a tentacle, pyriform glands, bacteriocytes and juvenile opisthosoma. Some larvae were reared under laboratory conditions for 10 weeks. At that stage red blood becomes visible and a small tentacular bud is formed dorsally.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1080/00364827.1992.10413513
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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