Below is a working checklist of echinoderms that potentially live in the waters of Mount Desert Island and adjacent ocean. When the presence of a species is verified, the source information will be added.
Please send verification and corrections 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) |
| Asteroidea | ? | Asteriidae | Asterias | forbesi | ? | Forbes' asterias | Pollock (1998) |
| Asteroidea | ? | Asteriidae | Asterias | rubens | ? | northern asterias | Southwest Harbor: Champlainer (TFV, tidepool) |
| Asteroidea | ? | Asteriidae | Leptasterias | tenera | ? | slender-armed star | Pollock (1998) |
| Asteroidea | ? | Goniopectinidae | Ctenodiscus | crispatus | ? | mud star | Pollock (1998) |
| Asteroidea | ? | Echinasteridae | Henricia | sanguinolenta | ? | blood star | Southwest Harbor: Champlainer (TFV, tidepool) |
| Asteroidea | ? | Goniasteridae | Hippasteria | phrygiana | ? | horse sea star | Pollock (1998) |
| Asteroidea | ? | Poraniidae | Porania | pulvillus | ? | badge sea star | Pollock (1998) |
| Asteroidea | ? | Pterasteridae | Pteraster | militaris | ? | winged sea star | Pollock (1998) |
| Asteroidea | ? | Solasteridae | Solaster | endeca | ? | purple sun star | Pollock (1998) |
| Asteroidea | ? | Solasteridae | Crossaster | papposus | ? | spiny sun star | Pollock (1998) |
| Ophiuroidea | ? | Amphiuridae | Axiognatus | squamatus | ? | dwarf brooding snake star | Pollock (1998) |
| Ophiuroidea | ? | Gorgonocephalidae | Gorgonocephalus | arcticus | ? | northern basket star | Pollock (1998) |
| Ophiuroidea | ? | Ophiacanthidae | Ophiacantha | bidentata | ? | [no common name] | Pollock (1998) |
| Ophiuroidea | ? | Ophiacanthidae | Ophiomitrella | clavigera | ? | [no common name] | Pollock (1998) |
| Ophiuroidea | ? | Ophiuridae | Ophiocten | scutatum | ? | [no common name] | Pollock (1998) |
| Ophiuroidea | ? | Ophiuridae | Ophiura | robusta | ? | [no common name] | Pollock (1998) |
| Ophiuroidea | ? | Ophiuridae | Ophiura | sarsi | ? | [no common name] | Pollock (1998) |
| Ophiuroidea | ? | Ophiactidae | Ophiopholis | aculeata | ? | daisy brittle star | Pollock (1998) |
| Holothuroidea | ? | Caudinidae | Caudina | arenata | ? | rat-tailed cucumber | Pollock (1998) |
| Holothuroidea | ? | Chiridotidae | Chiridota | laevis | ? | silky cucumber | Pollock (1998) |
| Holothuroidea | ? | Cucumariidae | Cucumaria | frondosa | ? | orange-footed cucumber | Pollock (1998) |
| Holothuroidea | ? | Cucumariidae | Duasmodactyla | commune | ? | [no common name] | Pollock (1998) |
| Holothuroidea | ? | Cucumariidae | Pentamera | calcigera | ? | [no common name] | Pollock (1998) |
| Holothuroidea | ? | Synaptidae | Epitomapta | roseola | ? | pink synapta | Pollock (1998) |
| Holothuroidea | ? | Synaptidae | Leptosynapta | tenuis | ? | white synapta | Pollock (1998) |
| Holothuroidea | ? | Molpadiidae | Molpadia | oolitica | ? | [no common name] | Pollock (1998) |
| Holothuroidea | ? | Psolidae | Psolus | fabricii | ? | scarlet psolus | Pollock (1998) |
| Holothuroidea | ? | Psolidae | Psolus | phantapus | ? | [no common name] | Pollock (1998) |
| Holothuroidea | ? | Sclerodactylidae | Sclerodactyla | briareus | ? | hairy cucumber | Pollock (1998) |
| Echinoidea | ? | Schizasteridae | Brisaster | fragilis | ? | [no common name] | Pollock (1998) |
| Echinoidea | ? | Echinarachniidae | Echinarachnius | parma | ? | sand dollar | Mount Desert: Champlainer (TFV, dead specimen on Seal Harbor Beach) |
| Echinoidea | ? | Strongylocentrotidae | Strongylocentrotus | droebachiensis | ? | green sea urchin (dorsal surface; ventral surface) |
Southwest Harbor: Champlainer (TFV, tidepool near Ship Harbor) |
