Key to the species of Tellervotrema Gibson & Bray, 1982

1. Position of genital pore bifurcal or pre-bifurcal; egg size small (47.5–66 × 24–42) or large (80–110 × 40–60); geographic locality either North Atlantic or North Pacific Oceans............................................................. 2

- Position of genital pore post-bifurcal; egg intermediate in size (70–82 × 40–52); geographic locality in North Pacific Ocean (off Japan).......................................... Tellervotrema katadara (Kuramochi, 2001) Kuramochi, 2009

2. Anterior extent of paired vitelline “bunches” in forebody (i.e. “ Tellervotrema vitellarium distribution”) to level of intestinal bifurcation or short distance posterior to it; cirrus pouch terminates posteriorly at level of intestinal bifurcation or just posterior to it; egg size small (47.5–66 × 24–42); geographic locality in North Atlantic Ocean (off Scotland, Gulf of Mexico)...................................................................... Tellervotrema armstrongi Gibson & Bray, 1982

- Anterior extent of paired vitelline “bunches” in forebody (i.e. “ Tellervotrema vitellarium distribution”) to level noticeably anterior to intestinal bifurcation (i.e. level of mid-oesophagus); cirrus pouch terminates posteriorly at level well posterior to intestinal bifurcation; egg size large (80–110 × 40–60); geographic locality in North Pacific Ocean (Bering Sea, off Oregon and Japan)........................................... Tellervotrema beringi (Mamaev, 1965) Gibson & Bray, 1982