According to Hobson (1976), complete worms are 16-30 mm long, 0.4-0.8 mm wide excluding parapodia, and have 61-80 ... [details]
The specific epithet refers to the absence of branchiae in the posterior body region. [details]
Type material collected on 23 and 26 April and 31 May 1974 included three specimens and two fragments with eggs. ... [details]
Maynard Cove, Victoria, British Columbia, Pacific Ocean (48.4517°, -123.265°). [details]