Ridgeia piscesae on Juan de Fuca Ridge.

Images taken using the vehicle ROPOS (Canadian Scientific Submersible Facility).A. Eight months post-eruption at Nascent Vent, South Rift Zone, Axial; scale 10 cm. B. Branchial plume with white obturaculum of high flux R. piscesae; scale 1.5 cm. C. Sparse branchial plumes in low flux grazed by polynoid polychaetes (top centre); scale 1.5 cm. D. Clump of short-fat R. piscesae on the side of a smoker chimney; fluids emerging from ledge below. Orange polychaetes are Paralvinella palmiformis, a microbial grazer; scale 5 cm. E. Extensive tubeworm clumps on basalts in weak fluid flow between chimneys; image about 2 m across.