Overview

Brief Summary

Deep-sea hydrothermal vents, methane seeps and shallow-water.

  • Stiller, J., Rousset, V., Pleijel, F., Chevaldonné, P., Vrijenhoek, R.C. & Rouse, G.W. (2013). Phylogeny, biogeography and systematics of hydrothermal vent and methane seep Amphisamytha (Ampharetidae, Annelida), with descriptions of three new species. Systematics and Biodiversity 11:35-65.
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The ampharetid genus Amphisamytha comprises nine known species of tube-dwelling worms. Seven species are known from deeper waters associated with hydrothermal vents and methane seeps in the Pacific and the Atlantic. 

  • Stiller, J., Rousset, V., Pleijel, F., Chevaldonné, P., Vrijenhoek, R.C. & Rouse, G.W. (2013). Phylogeny, biogeography and systematics of hydrothermal vent and methane seep Amphisamytha (Ampharetidae, Annelida), with descriptions of three new species. Systematics and Biodiversity 11:35-65.
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Comprehensive Description

Remarks

9 species known; found in deep sea hydrothermal vent and methane seep communities.

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© Wilson, Robin

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Description

Prostomium anteriorly truncated, simple. Buccal tentacles smooth. Prostomial dorsal glandular ridges absent. Branchiae 4 pairs. All branchiae similar, all smooth. Only last pair of branchiae clearly associated with a specific segment. Paleae on segment 3 absent. Dorsal crest present. Nuchal (post branchial) hooks on segment 4 absent. Notopodia all similar. Neuropodia present. Segments 3–6 without neurochaetae. Number of pairs of thoracic uncinigers 14. Abdominal notopodial rudiments present. Anal cirri present, 1 pair.

Description generated from: Hutchings, PA & Johnson, RT, 2003. Australian Ampharetidae (Polychaeta) DELTA database. In Wilson RS, Hutchings PA & Glasby CJ (eds) Polychaetes: Interactive Identification and Information Retrieval. CSIRO Publishing, Melbourne.

Additional references:
Fauchald, K. 1977. The polychaete worms. Definitions and keys to the orders, families and genera. Natural History Museum of Los Angeles County, Science Series 28, 1-188.
Stiller, J., Rousset, V., Pleijel, F., Chevaldonné, P., Vrijenhoek, R. C., & Rouse, G. W. (2013). Phylogeny, biogeography and systematics of hydrothermal vent and methane seep Amphisamytha (Ampharetidae, Annelida), with descriptions of three new species. Systematics and Biodiversity, 11(1), 35-65.
Reuscher, M., Fiege, D., & Wehe, T. (2009). Four new species of Ampharetidae (Annelida: Polychaeta) from Pacific hot vents and cold seeps, with a key and synoptic table of characters for all genera. Zootaxa, 2191, 1-40.

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Source: Annelida LifeDesk

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Distribution

Distribution within Australia: Not known from Australia.

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Amphisamytha species were only known from the Pacific Ocean but the genus' range was recently extended to the hydrothermal vents of the Atlantic Ocean. The molecular study by Stiller et al. (2013) showed that a species previously assigned to a different genus (Amathys) from Atlantic hydrothermal vents is a member of Amphisamytha.

  • Stiller, J., Rousset, V., Pleijel, F., Chevaldonné, P., Vrijenhoek, R.C. & Rouse, G.W. (2013). Phylogeny, biogeography and systematics of hydrothermal vent and methane seep Amphisamytha (Ampharetidae, Annelida), with descriptions of three new species. Systematics and Biodiversity 11:35-65.
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Ecology

Habitat

Deep sea.

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Depth range based on 117 specimens in 3 taxa.
Water temperature and chemistry ranges based on 106 samples.

Environmental ranges
  Depth range (m): 1519.5 - 3660
  Temperature range (°C): 1.629 - 2.931
  Nitrate (umol/L): 21.028 - 43.603
  Salinity (PPS): 34.493 - 34.944
  Oxygen (ml/l): 1.130 - 5.742
  Phosphate (umol/l): 1.396 - 3.060
  Silicate (umol/l): 34.435 - 177.173

Graphical representation

Depth range (m): 1519.5 - 3660

Temperature range (°C): 1.629 - 2.931

Nitrate (umol/L): 21.028 - 43.603

Salinity (PPS): 34.493 - 34.944

Oxygen (ml/l): 1.130 - 5.742

Phosphate (umol/l): 1.396 - 3.060

Silicate (umol/l): 34.435 - 177.173
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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Evolution and Systematics

Systematics or Phylogenetics

A molecular phylogeny of eight Amphisamytha species can be found in Stiller et al. (2013). 

  • Stiller, J., Rousset, V., Pleijel, F., Chevaldonné, P., Vrijenhoek, R.C. & Rouse, G.W. (2013). Phylogeny, biogeography and systematics of hydrothermal vent and methane seep Amphisamytha (Ampharetidae, Annelida), with descriptions of three new species. Systematics and Biodiversity 11:35-65.
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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage

Barcode of Life Data Systems (BOLD) Stats
Specimen Records:90
Specimens with Sequences:91
Specimens with Barcodes:90
Species:1
Species With Barcodes:1
Public Records:85
Public Species:1
Public BINs:12
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Barcode data

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Genomic DNA is available from 2 specimens with morphological vouchers housed at Bermuda Aquarium, Museum and Zoo
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© Ocean Genome Legacy

Source: Ocean Genome Resource

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