The working checklist below of ribbon-worm species is based on Pollock (1998), which reported them as occurring between Cape Cod and Newfoundland. Please send corrections and updates to info@vfthomas.com. Photographs are welcome. Thank you.
| Class | Order | Family | Genus | Specific Epithet | authority | common name | Sources (full citations given after this table) |
| Anopla | Heteronemertea | Lineidae | Cerebratulus | lacteus | (Leidy) | milky ribbon-worm | Pollock (1998), Procter (1933, p. 130) |
| Anopla | Heteronemertea | Lineidae | Lineus | arenicola | ? | sandy lineus | Pollock (1998) |
| Anopla | Heteronemertea | Lineidae | Lineus | ruber | (O. F. Müller) | ? | Pollock (1998), Procter (1933, p. 130.) |
| Anopla | Heteronemertea | Lineidae | Lineus | socialis | (Leidy) | ? | Pollock (1998), Procter (1933, p. 130.) |
| Anopla | Heteronemertea | Lineidae | Micrura | affinis | ? | bright red ribbon-worm | Pollock (1998) |
| Anopla | Heteronemertea | ? | Myoisophagos | sanguineus | (Rathke) | ? | Pollock (1998) as Lineus sanguineus |
| Anopla | Paleonemertea | Cephalothricidae | Procephalothrix | spiralis | Coe | thread ribbon-worm | Pollock (1998), Procter (1933, p. 130. [see note 1 below]) |
| Enopla | Bdellonemertea | Malacobdellidae | Malacobdella | grossa | ? | leech ribbon-worm | Pollock (1998) |
| Enopla | Hoplonemertea | Amphiporidae | Amphiporus | angulatus | (O. F. Müller) | chevron amphiporus | Pollock (1998), Procter (1933, p. 129.) |
| Enopla | Hoplonemertea | Amphiporidae | Zygonemertes | virescens | ? | green ribbon-worm | Pollock (1998) |
| Enopla | Hoplonemertea | Carcinonemertidae | Carcinonemertes | carcinophila | ? | crab nemertean | Pollock (1998) |
| Enopla | Hoplonemertea | Prosorchochmidae | Oerstedia | dorsalis | ? | ? | Pollock (1998) |
| Enopla | Hoplonemertea | Tetrastemmatidae | Tetrastemma | candidum | (O. F. Müller) | green four-eyed ribbon-worm | Pollock (1998), Procter (1933, p. 129.) |
| ? | ? | Tetrastemmatidae | Cyanophthalma | cordiceps | ? | striped four-eyed ribbon-worm | Pollock (1998) |