Overview

Comprehensive Description

Hard substrate with oxide deposits and bacterial mats. Temperature 5-17°C. Specific structure of buccal cavity points to epistrate feeder.

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Distribution

Lau Back-Arc Basin.

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Physical Description

Morphology

Draconematid with coarsely striated cuticle except in head region. Helmet present. Amphid spiral. Buccal cavity well developed, with a dorsal tooth and two small subventral teeth. Pharynx with terminal bulb. Numerous cephalic adhesion tubes with non-swollen base and open tip located posterior head region and extending to about two head diamters along the cervical region; posterior adhesion tubes with bellshaped end, all located anterior to cloacal opening/anus. Tail cylindro-conoid with numerous annules. Four pairs of cloacal setae. Females with vulva at about 48% of body length. Males with spicule length 40-50 ìm.

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Size

575-850 ?m.

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Type Information

Paratype for Cephalochaetosoma pacificum notium Decraemer & Gourbault, 1997
Catalog Number: USNM 172813
Collection: Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology
Sex/Stage: male; female;;; ;; juvenile
Preparation: Slide
Collector(s): A. Dinet
Year Collected: 1989
Locality: Lau Group, Fiji, South Pacific Ocean
Microhabitat: Hydrothermal vents
Depth (m): 1887 to 1887
Vessel: Nautile DSR/V
  • Paratype:
Creative Commons Attribution 3.0 (CC BY 3.0)

© Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology

Source: National Museum of Natural History Collections

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Paratype for Cephalochaetosoma pacificum notium Decraemer & Gourbault, 1997
Catalog Number: USNM 172814
Collection: Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology
Sex/Stage: male; female;;; ;; juvenile
Preparation: Slide
Collector(s): A. Dinet
Year Collected: 1989
Locality: Lau Group, Fiji, South Pacific Ocean
Microhabitat: Hydrothermal vents
Depth (m): 1887 to 1887
Vessel: Nautile DSR/V
  • Paratype:
Creative Commons Attribution 3.0 (CC BY 3.0)

© Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology

Source: National Museum of Natural History Collections

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Paratype for Cephalochaetosoma pacificum notium Decraemer & Gourbault, 1997
Catalog Number: USNM 172811
Collection: Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology
Sex/Stage: male; female;;; ;; juvenile
Preparation: Slide
Collector(s): A. Dinet
Year Collected: 1989
Locality: Lau Group, Fiji, South Pacific Ocean
Microhabitat: Hydrothermal vents
Depth (m): 1887 to 1887
Vessel: Nautile DSR/V
  • Paratype:
Creative Commons Attribution 3.0 (CC BY 3.0)

© Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology

Source: National Museum of Natural History Collections

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Paratype for Cephalochaetosoma pacificum notium Decraemer & Gourbault, 1997
Catalog Number: USNM 172812
Collection: Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology
Sex/Stage: male; female;;; ;; juvenile
Preparation: Slide
Collector(s): A. Dinet
Year Collected: 1989
Locality: Lau Group, Fiji, South Pacific Ocean
Microhabitat: Hydrothermal vents
Depth (m): 1887 to 1887
Vessel: Nautile DSR/V
  • Paratype:
Creative Commons Attribution 3.0 (CC BY 3.0)

© Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology

Source: National Museum of Natural History Collections

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Ecology

Habitat

Depth range based on 5 specimens in 1 taxon.
Water temperature and chemistry ranges based on 5 samples.

Environmental ranges
  Depth range (m): 1600 - 1887
  Temperature range (°C): 2.382 - 2.931
  Nitrate (umol/L): 35.857 - 36.027
  Salinity (PPS): 34.581 - 34.620
  Oxygen (ml/l): 3.445 - 3.503
  Phosphate (umol/l): 2.499 - 2.558
  Silicate (umol/l): 99.065 - 117.588

Graphical representation

Depth range (m): 1600 - 1887

Temperature range (°C): 2.382 - 2.931

Nitrate (umol/L): 35.857 - 36.027

Salinity (PPS): 34.581 - 34.620

Oxygen (ml/l): 3.445 - 3.503

Phosphate (umol/l): 2.499 - 2.558

Silicate (umol/l): 99.065 - 117.588
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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