Byssally attached to lava around diffuse vents, with absence of massive hydrothermal deposits and vent fluid temperature not exceeding 8.5°C. Endemic to vents. Development not known but most probably with planktonic larval phase.

North Fiji Back-Arc Basin.

Shell elongate-wedge shaped, slender, beaks well subterminal. Ventral margin straight or slightly convex. Ligament plate somewhat arched to straight. Exterior with irregular growth lines and narrow to broad irregular, concentric grooves, mostly on the ventral part. Periostracum glossy, light chestnut brown, in umbonal region lighter brown. Anterior retractor scar at the anterior part of the umbonal cavity. Anterior part of posterior byssus retractor muscle scar at 2/3 of the ligament. Animal with large gills. Mantle lobes on anterior half of ventral side separate. Valvular siphonal membrane short.

Shell length up to 155 mm.

Paratype for Bathymodiolus elongatus Von Cosel et al., 1994
Catalog Number: USNM 882203
Collection: Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology
Preparation: Alcohol (Ethanol)
Collector(s): Y. Nojiri
Year Collected: 1989
Locality: North Fiji Basin, Mussel Valley Site, Fiji, South Pacific Ocean
Depth (m): 2750 to 2750
Vessel: Nautile DSR/V

Depth range based on 6 specimens in 1 taxon.
Water temperature and chemistry ranges based on 4 samples.

Environmental ranges
  Depth range (m): 1600 - 2750
  Temperature range (°C): 1.719 - 2.931
  Nitrate (umol/L): 35.857 - 38.344
  Salinity (PPS): 34.581 - 34.677
  Oxygen (ml/l): 2.750 - 3.503
  Phosphate (umol/l): 2.499 - 2.775
  Silicate (umol/l): 99.065 - 138.380

Graphical representation

Depth range (m): 1600 - 2750

Temperature range (°C): 1.719 - 2.931

Nitrate (umol/L): 35.857 - 38.344

Salinity (PPS): 34.581 - 34.677

Oxygen (ml/l): 2.750 - 3.503

Phosphate (umol/l): 2.499 - 2.775

Silicate (umol/l): 99.065 - 138.380
 
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