The siphons are said to be orange, though in this view in our tank they look more brownish-orange or cream colored (compare below). Photo by Dave Cowles, July 2005
This individual has siphons which are more orange-colored. Note also the foot projecting from the anteroventral side (top right), which appears to be specialized for holding onto rocks rather than the standard hatchet-shape seen in species which dig in soft substrates. Photo by Dave Cowles, July 2012