| Family | Common Name | Selected Genus and Species | Image |
|---|---|---|---|
| Amphinomidae | Bristle worms | Hermodice carunculata | |
| Euphrosinidae | Marine worms | Euphrosine triloba | |
| Family | Common Name | Selected Genus and Species | Image |
|---|---|---|---|
| Chaetophteridae | Tube worms | Chaetopterus variopedatus |  |
| Ctenodrilidae | Bristle worms | Ctenodrilus serratus |  |
| Magelonidae | Bristle worms | Magelona filiformis |  |
| Poeobiidae | Bristle worms | Poeobius meseres |  |
| Polygordiidae | Bristle worms | Polygordius appendiculatus |  |
| Protodrilidae | Bristle worms | Lindrilus rubropharyngeus |  |
| Protodriloididae | Bristle worms | Protodriloides chaetifer |  |
| Sabellariidae | Marine worms | Sabellaria alveolata |  |
| Saccocirridae | Bristle worms | Saccocirrus pussicus |  |
| Siboglinidae | Beard worms | Riftia pachyptila |  |
| Spirorbidae | Bristle worms | Janua heterostropha |  |
| Family | Common Name | Selected Genus and Species | Image |
|---|---|---|---|
| Bonelliidae | Spoon worms | Bonellia viridis |  |
| Echiuridae | Spoon worms | Echiurus echiurus |  |
| Ikedidae | Spoon worms | Ikeda taenioides |  |
| Thalassematidae | Spoon worms | Ochetostoma erythrogrammon |  |
| Urechidae | Spoon worms | Urechis caupo |  |
| Family | Common Name | Selected Genus and Species | Image |
|---|---|---|---|
| Dorvilleidae | Marine worms | Schistomeringos longicornis |  |
| Eunicidae | Marine worms | Eunice aphroditois |  |
| Hartmaniellidae | Sea thumbs | Hartmaniella erecta |  |
| Ichthyotomidae | Marine worms | Ichthyotomus sanguinarius |  |
| Lumbrineridae | Marine worms | Eranno bicarrata |  |
| Oenonidae | Marine worms | Arabella robusta |  |
| Onuphidae | Marine worms | Diopatra neapolitana |  |
| Family | Common Name | Selected Genus and Species | Image |
|---|---|---|---|
| Aberrantidae | Marine worms | Aberranta palpata |  |
| Acoetidae | Marine worms | Polyodontes maxillosus |  |
| Alciopidae | Marine worms | Alciopina parasitica |  |
| Antonbruunidae | Marine worms | Antonbruunia sociabilis |  |
| Aphroditidae | Sea mice | Aphrogenia alba |  |
| Chrysopetalidae | Marine worms | Dysponetus populonectens |  |
| Eulepethidae | Marine worms | Pareulepis malayana |  |
| Glyceridae | Beak-thrower worms | Glycera alba |  |
| Goniadidae | Marine worms | Gonida maculata |  |
| Hesionidae | Marine worms | Oxydromus pugettensis |  |
| Iospilidae | Marine worms | Phalacrophorus uniformis |  |
| Lacydoniida | Marine worms | Lacydonia eliasoni |  |
| Lopadorrhynchidae | Marine worms | Lopadorrhynchus brevis |  |
| Myzostomidae | Marine worms | Myzostoma capitocutis |  |
| Nautiliniellidae | Marine worms | Natsushima bifurcata |  |
| Nephtyidae | Cat-worms | Nephtys hombergii |  |
| Nereididae | Rag-worms | Alitta succinea |  |
| Nerillidae | Marine worms | Nerilla antennata |  |
| Paralacydoniidae | Marine worms | Paralacydonia paradoxa |  |
| Pholoidae | Scale worms | Pholoides asperus |  |
| Phyllodocidae | Marine worms | Phyllodoce lineata |  |
| Pilargidae | Marine worms | Hermundura fauveli |  |
| Pisionidae | Marine worms | Pisione remota |  |
| Polynoidae | Scale worms | Lepidonotus oculatus |  |
| Pontodoridae | Marine worms | Pontodora pelagica |  |
| Sigalionidae | Marine worms | Sthenelais boa |  |
| Sphaerodoridae | Marine worms | Sphaerephesia philippi |  |
| Spintheridae | Marine worms | Spinther arcticus |  |
| Syllidae | Marine worms | Syllis gracilis |  |
| Tomopteridae | Marine worms | Tomopteris elegans |  |
| Typhloscolecidae | Marine worms | Typhloscolex muelleri |  |
| Yndolaciidae | Marine worms | Yndolacia lopadorrhynchoides |  |
| Family | Common Name | Selected Genus and Species | Image |
|---|---|---|---|
| Fabriciidae | Marine worms | Fabricia stellaris |  |
| Oweniidae | Marine worms | Owenia fusiformis |  |
| Sabellidae | Feather duster worms | Sabella spallanzanii |  |
| Serpulidae | Christmas tree worms | Spirobranchus giganteus |  |
| Family | Common Name | Selected Genus and Species | Image |
|---|---|---|---|
| Aeolosomatidae | Suction-feeding worms | Aeolosoma hemprichi |  |
| Arenicolidae | Lugworms | Arenicola marina |  |
| Capitellidae | Lugworms | Capitella capitata |  |
| Cossuridae | Worms | Cossura pygodactylata |  |
| Histriobdellidae | Worms | Stratiodrilus circensis |  |
| Laetmonectidae | Worms | Laetmonecticus nigrum |  |
| Maldanidae | Bamboo worms | Maldane sarsi |  |
| Opheliidae | Worms | Euzonus flabelligerus |  |
| Orbiniidae | Worms | Orbinia sertulata |  |
| Paraonidae | Worms | Paraonides platybranchia |  |
| Parergodrilidae | Worms | Stygocapitella subterranea |  |
| Potamodrilidae | Worms | Potamodrilus fluviatilis | |
| Psammodrilidae | Worms | Psammodrilus balanoglossoides |  |
| Questidae | Worms | Novaquesta trifurcata |  |
| Scalibregmatidae | Worms | Scalibregma inflatum |  |
| Travisiidae | Worms | Travisia forbesii |  |
| Family | Common Name | Selected Genus and Species | Image |
|---|---|---|---|
| Apistobranchidae | Bristle worms | Apistobranchus tullbergi |  |
| Longosomatidae | Bristle worms | Heterospio sinica |  |
| Poecilochaetidae | Bristle worms | Poecilochaetus serpens |  |
| Spionidae | Bristle worms | Scolelepis squamata |  |
| Trochochaetidae | Bristle worms | Trochochaeta multisetosa |  |
| Uncispionidae | Bristle worms | Uncispio reesi |  |
| Family | Common Name | Selected Genus and Species | Image |
|---|---|---|---|
| Acrocirridae | Bristle worms | Macrochaeta clavicornis |  |
| Alvinellidae | Bristle worms | Alvinella pompejana |  |
| Ampharetidae | Bristle worms | Ampharete acutifrons |  |
| Cirratulidae | Bristle worms | Cirratulus cirratus |  |
| Fauveliopsidae | Bristle worms | Laubieriopsis norvegica |  |
| Flabelligeridae | Cage worms | Trophoniella radesiensis |  |
| Pectinariidae | Trumpet worms | Lagis koreni |  |
| Sternaspidae | Mud owls | Sternaspis scutata |  |
| Terebellidae | Spaghetti worms | Lanice conchilega |  |
| Trichobranchidae | Bristle worms | Terebellides horikoshii |  |