[3] It is a marine, deep water-dwelling eel which is known from the eastern and western Pacific Ocean, including Japan, Chile, and California, USA.

It dwells at a depth range of 0 to 3,243 metres (0 to 10,640 ft), most often around 305 metres (1,001 ft).

Males can reach a maximum total length of 76 centimetres (30 in).

[2] The species epithet "sector" refers to the manner in which the roof of the eel's mouth is divided into equal parts or "sectors" by the vomer.

[2] The diet of S. sector consists primarily of amphipods and zooplankton, as well as small bony fish and cephalopods.