| Absent | Absent |
| Abundance | Abundance |
| AbundanceAndDistributionOfMarineMammals | Abundance and Distribution of marine mammals (M4) |
| Abyssobenthic | Abyssobenthic (Abyssal) |
| Abyssopelagic | Abyssopelagic (2500-6000 m) |
| AccessoryFeedingStructures | Accessory feeding structures |
| Accretion | Accretion |
| Actinula | Actinula |
| Adult | Adult |
| AdultBody | Adult body |
| AdultBurrow | Adult burrow |
| AdultDiapause | Adult |
| Adverse habitat modification | Adverse habitat modification |
| AerialDipping | Aerial dipping |
| AerialHawking | Aerial hawking |
| AgeAtMaturity | Age at maturity |
| Aggregations | Aggregations |
| AlgalGravel | Algal gravel |
| Alien | Alien |
| AlphaHaline | Alpha-haline |
| AlphaMesohaline | Alpha-Mesohaline |
| AlphaOligohaline | Alpha-Oligohaline |
| AlphaPolyhaline | Alpha-Polyhaline |
| AlternationOfGenerations | Alternation of generations |
| Alters bio-geochemical/hydrologic cycles | Alters bio-geochemical/hydrologic cycles |
| Alters trophic interactions | Alters trophic interactions |
| Ambusher | Ambusher |
| AmorphousCaCO3 | Amorphous CaCO3 |
| Amphiblastula | Amphiblastula |
| AnchialineCaves | Anchialine caves |
| AnchorShaped | Anchor-shaped |
| Anisogamous | Anisogamous |
| AnnualEpisodic | Annual episodic |
| AnnualProtracted | Annual protracted |
| ApomicticParthenogenesis | Apomictic parthenogenesis |
| AppendagesPaddles | Appendages (paddles) |
| Aquaculture: accidental | Aquaculture: accidental |
| Aquaculture: deliberate | Traits:Pathways/vector |
| Aquatic transport | Aquatic transport |
| Aragonite | Aragonite |
| ArborescentArbuscular | Arborescent/Arbuscular |
| AristolesLantern | Aristotle's lantern |
| ArmsAppendages | Arms or appendages |
| Arrhenotoky | Arrhenotoky |
| Articulate | Articulate |
| Artificial | Artificial (man-made) |
| AscidianTadpole | Ascidian tadpole |
| AsexualReproduction | Asexual reproduction |
| AttachedSediment | Sediment surface |
| Auricularia | Auricularia |
| AutomicticParthenogenesis | Automictic parthenogenesis |
| Autotroph | Autotroph |
| BallooningKiting | Ballooning/Kiting |
| Bathybenthic | Bathybenthic (Bathyal) |
| Bathylpelagic | Bathylpelagic (1000-2500 m) |
| Beak | Beak |
| BedForming | Bed forming |
| Bedrock | Bedrock |
| Benthic | Benthic |
| Benthopelagic | Benthopelagic |
| BetaHaline | Beta-Haline |
| BetaMesohaline | Beta-Mesohaline |
| BetaOligohaline | Beta-Oligohaline |
| BetaPolyhaline | Beta-Polyhaline |
| Biannual | <Biannual |
| BiannualEpisodic | Biannual episodic |
| BiannualProtracted | Biannual protracted |
| Bio-control: accidental translocation with deliberate bio-control release | Bio-control: accidental translocation with deliberate bio-control release |
| Bio-control: deliberate translocation as a bio-control agent | Bio-control: deliberate translocation as a bio-control agent |
| Biodiffusor | Biodiffusor |
| Biogenic | Bio-genic |
| BiogenicReef | Biogenic reef |
| Biological Descriptors | Biological Descriptors |
| Bipinnaria | Bipinnaria |
| BirdsDirective | Birds Directive |
| BirdsDirectiveAnnex1 | Birds Directive Annex 1 |
| BirdsDirectiveAnnex2 | Birds Directive Annex 2 |
| BirdsDirectiveAnnex3 | Birds Directive Annex 3 |
| BirdsDirectiveAnnex4 | Birds Directive Annex 4 |
| BirdsDirectiveAnnex5 | Birds Directive Annex 5 |
| BitingMacerating | Biting or macerating |
| BitingPiercing | Piercing or suctorial |
| Bivalved | Bivalved |
| Bivoltine | Bivoltine |
| BlindEndedVentilation | Blind-ended ventilation |
| BodyAccretion | Accretion |
| BodyAlgalGravel | Algal gravel |
| BodyForm | Body form |
| BodyShape | Body shape |
| BodySize | Body size |
| Bodylength | Body length |
| Border Intercept | Border Intercept |
| Brachioloaria | Brachiolaria |
| Brackish | Brackish |
| BrackishSalinity | Brackish |
| Broadcast | Broadcast |
| BroodChamber | Brood chamber |
| Brooding | Brooding |
| BroodingBehaviour | Brooding behaviour |
| Browser | Browser |
| BuccalOrgansAbsent | Buccal organ absent or occluded |
| Budding | Budding |
| BullateSaccate | Bullate/Saccate |
| BurrowBuilder | Burrow builder |
| BurrowDweller | Burrow dweller |
| Burrower | Burrower |
| Bysso-Pelagic | Bysso-pelagic |
| CITES | CITES |
| CITESAppendixI | CITES Appendix I |
| CITESAppendixII | CITES Appendix II |
| CITESAppendixIII | CITES Appendix III |
| Calcareous | Calcareous |
| CalcareousSkeleton | Calcareous |
| Calcite | Calcite |
| Canals: natural range expansion through man-made canals | Canals: natural range expansion through man-made canals |
| CapitateClubbed | Capitate/Clubbed |
| Captacula | Captacula |
| Carnivore | Carnivore |
| Cave | Cave |
| CementedAttached | Cemented or attached |
| CephalicSpines | Cephalic spines |
| Chains | Chains |
| ChangeInAverageTrophicLevelOfMarinePredatorsInTheBayOfBiscay | Change in average trophic level of marine predators in the Bay of Biscay (FW4) |
| ChangesInBiodiversityIndex | Changes in biodiversity index(s) (PH3) |
| ChangesInPlanktonFunctionalTypesIndexRatio | Changes in plankton functional types (life form) index Ratio (PH1/FW5) |
| Chemoautotroph | Chemoautotroph |
| Chitinous | Chitinous |
| Choanocytes | Choanocytes |
| CiliaFlagella | Cilia/Flagella |
| Circalittoral | Circalittoral |
| CircalittoralOffshore | Circalittoral offshore |
| Clathrate | Clathrate |
| Clawed | Clawed |
| Clay | Clay |
| ClutchSize | Clutch size |
| CoarseCleanSand | Coarse clean sand |
| CoarseSediments | Coarse sediments |
| Cobbles | Cobbles |
| Colonial (e.g. sea birds) | Colonial (e.g. sea birds) |
| Commensal (with/on/in) | Commensal (with/on/in) |
| Common | Common |
| Common to dominant | Common to dominant |
| Conaria | Conaria |
| ConditionOfBenthicHabitatCommunities | Condition of Benthic Habitat Communities (BH2) |
| ConeHalfSphere | Cone with half sphere |
| Conical | Cone (Conical) |
| Consumes native species (predator or herbivore) | Consumes native species (predator or herbivore) |
| ContactDipping | Contact dipping |
| Copepodid | Copepodid (copepodite) |
| CoralSands | Coral (or similar) sands |
| Coronate | Coronate |
| CrawlerWalkerClimber | Crawler/Walker/Climber |
| Creeper | Creeper |
| CrevicesFissures | Crevices and fissures |
| CriticallyEndangered | Critically Endangered (CR) |
| Cruising | Cruising |
| CrustoseHard | Crustose hard |
| CrustoseSoft | Crustose soft |
| Ctenidia | Ctenidia |
| Cushion | Cushion |
| Cydippid | Cydippid |
| Cylindrical | Cylindrical |
| Cyphonautes | Cyphonautes |
| Cypris | Cyprid (cypris) |
| Dabbling | Dabbling |
| Damage to marine structures or archaeology | Damage to marine structures or archaeology |
| DataDeficient | Data Deficient (DD) |
| DeOxygenationTolerance | De-Oxygenation Tolerance |
| Debris: transport of species on human generated debris | Debris: transport of species on human generated debris |
| Demersal | Demersal |
| Dendroid | Dendroid |
| Dependancy | Dependency |
| DepositFeeder | Deposit Feeder |
| Depth | Depth |
| DepthRange | Depth range |
| DepthSubstratum | Depth in substratum |
| Detected in invasion pathway | Detected in invasion pathway |
| Detected in the wild | Detected in the wild |
| Detritivore | Detritivore |
| Diameter | Diameter |
| DiapauseStage | Dormancy/Diapause Stage |
| Diel | Diel |
| Digitate | Digitate |
| Diplontic | Diplontic |
| Dipping | Dipping |
| DippingToSurface | Dipping to surface |
| DirectDevelopment | Direct development |
| DispersalPotential | Larval or juvenile dispersal potential |
| DispersalPotentialAdult | Dispersal potential (adult) |
| Distribution Descriptors | Distribution Descriptors |
| Diving | Diving |
| Doliolaria | Doliolaria |
| Dominant | Dominant |
| DoubleCone | Double cone |
| DownwardConveyor | Downward conveyor |
| Drifter | Drifter |
| DrivingFishForward | Driving Fish Forward |
| Echinopluteus | Echinopluteus |
| Ecological Descriptors | Ecological Descriptors |
| EcologicalInteraction | Ecological Interaction |
| Ecophysiology | Ecophysiology |
| Ectoparasitic | Ectoparasitic |
| EggClutchLocation | Egg, egg mass or clutch location |
| EggPropaguleSize | Egg or propagule size |
| EggSac | Egg sac |
| Eggs | Eggs |
| Elevation | Elevation |
| EnclosedCoast | Enclosed coast or embayment |
| Encrusting | Encrusting |
| Endangered | Endangered (EN) |
| Endoparasitic | Endoparasitic |
| Endophytic | Endophytic |
| Endoskeleton | Endoskeleton |
| Endozoic | Endozoic |
| Environment | Environment |
| EnvironmentalPosition | Environmental position |
| Ephyra | Ephyra |
| Epibenthic | Epibenthic |
| Epifaunal | Epifaunal |
| Epifloral | Epifloral |
| Epilithic | Epilithic |
| Epipelagic | Epipelagic (0-200 m) |
| Epipelic | Epipelic |
| Epiphytic | Epiphytic |
| Epizooic | Epizooic |
| Eradicated | Eradicated |
| Eradication unconfirmed | Eradication unconfirmed |
| Erect | Erect |
| Established | Established |
| Established and expanding | Established and expanding |
| Established and stable | Established and stable |
| Estuary | Estuary |
| Eulittoral | Littoral |
| EversiblePharynx | Eversible pharynx |
| Exoskeleton | Exoskeleton (including shells) |
| Exposed | Exposed |
| ExtentOfPhysicalDamageToPredominantAndSpecialHabitats | Extent of Physical Damage to Predominant and Special Habitats (BH3) |
| External | External |
| ExternalTube | External Tube |
| Extinct | Extinct (EX) |
| ExtinctInTheWild | Extinct in the Wild (EW) |
| Extirpated | Extirpated |
| ExtremelyExposed | Extremely exposed |
| ExtremelySheltered | Extremely sheltered |
| FAOASFISSpeciesForFisheryStatisticsPurposes | FAO-ASFIS: Species for Fishery Statistics Purposes |
| FaunalBeds | Faunal beds |
| FeaturesOther | Features or other substratum |
| Fecundity | Fecundity |
| Feeding | Feeding |
| FeedingApparatus | Feeding apparatus |
| FeedingMethodBehaviour | Feeding Method/Behaviour |
| Fertilization | Fertilization |
| FilerBasket | Filter basket |
| Filiform | Filiform |
| FineCleanSand | Fine clean sand |
| Fisheries: accidental as bait | Fisheries: accidental as bait |
| Fisheries: accidental with deliberate translocations of fish or shellfish | Fisheries: accidental with deliberate translocations of fish or shellfish |
| Fisheries: accidental with fishery products, packing or substrate | Fisheries: accidental with fishery products, packing or substrate |
| Fisheries: deliberate translocations of fish or shellfish to establish or support fishery | Fisheries: deliberate translocations of fish or shellfish to establish or support fishery |
| Fission | Fission |
| Flabellate | Flabellate |
| Flaccid | Flaccid |
| FlattenedEllipsoid | Flattened Ellipsoid |
| Flexibility | Flexibility |
| Floating | Floating |
| Fluctuating | Fluctuating |
| FlyerFlight | Flyer (Flight) |
| Foliose | Foliose |
| FollowingFishingBoats | Following Fishing Boats |
| FoodPiracy | Food Piracy |
| FoodTypeDiet | Food Type/Diet |
| FootPaddling | Foot Paddling |
| FootStirring | Foot Stirring |
| Forest | Forest |
| ForestForming | Forest-forming |
| ForkLength | Fork length (FL) |
| Fragile | Fragile |
| Fragility | Fragility |
| FreeLiving | Free living |
| FreeWaterColumn | Free or water column |
| Freshwater | Freshwater |
| FreshwaterSalinity | Freshwater |
| FunnelShaped | Funnel Shaped |
| GameteType | Gamete type |
| GenerationTime | Generation time |
| Genetic impacts: hybridisation and introgression | Genetic impacts: hybridisation and introgression |
| GillRakers | Gill rakers |
| Gills | Gills |
| Glider | Glider |
| Globose | Globose |
| Glochidium | Glochidium |
| GoettesLarva | Goette's larva |
| Gonochoristic | Gonochorisitc (dioecious) |
| Gorgonin | Gorgonin |
| Grasping | Grasping |
| GraspingClaws | Grasping claws |
| GraspingPaws | Grasping paws, hands, feet |
| GravelShingle | Gravel or shingle |
| GravellyMud | Gravelly mud |
| GravellyMuddySand | Gravelly muddy sand |
| GravellySand | Gravelly sand |
| Grazer | Grazer |
| GrazerBrowser | Grazer/Browser |
| GrazerFrondsBlades | Grazer (fronds/blades) |
| GrazerGrainsParticles | Grazer (grains / particles) |
| GrazerSurfaceSubstratum | Grazer (surface/substratum) |
| Gregarious | Gregarious |
| GreySealPupProduction | Grey seal pup production (M5) |
| GroundForaging | Ground Foraging |
| GrowthForm | Growth form (or type) |
| GrowthRate | Growth Rate |
| Habitat | Habitat |
| HabitatModification | Habitat modification |
| HabitatPreferences | Habitat Preferences |
| HabitatsDirective | Habitats Directive |
| HabitatsDirectiveAnnexI | Habitats Directive Annex I |
| HabitatsDirectiveAnnexII | Habitats Directive Annex II |
| HabitatsDirectiveAnnexIII | Habitats Directive Annex III |
| HabitatsDirectiveAnnexIV | Habitats Directive Annex IV |
| HabitatsDirectiveAnnexV | Habitats Directive Annex V |
| HabitatsDirectiveAnnexVI | Habitats Directive Annex VI |
| Hadobenthic | Hadobenthic (Hadal) |
| Hadopelagic | Hadopelagic (>6000 m) |
| HalfCone | Half cone |
| HalfConeFlattenedEllipsoid | Half cone with flattened ellipsoid |
| HalfParallelepiped | Half parallelepiped |
| HalfSphereDome | Half sphere (dome) |
| HaploidDiploid | Haploid-diploid (haplodiplontic) |
| Haplontic | Haplontic |
| Hard | Hard |
| HardImmobile | Immobile hard |
| HardMobile | Mobile hard |
| HardSubstrata | Rock (hard substrata) |
| Hawking | Hawking |
| HeightAboveSubstratum | Height (above substratum) |
| Herbivore | Herbivore |
| Heteromorphic | Heteromorphic |
| Heterotroph | Heterotroph |
| HighMagnesiumCalcite | High Magnesium Calcite |
| Host | Host |
| HoverDipping | Hover dipping |
| Hovering | Hovering |
| Human health | Human health |
| Hydrostatic | Hydrostatic skeleton |
| HyperSaline | Hyper-saline |
| Hyperbenthic | Hyperbenthic |
| IUCNRedList | IUCN Red List |
| IceAssociated | Ice-Associated |
| Impact | Impact |
| In captivity/cultivated | In captivity/cultivated |
| Independant (Free living) | Independant (free living) |
| Individual release: accidental release by individuals | Individual release: accidental release by individuals |
| Individual release: deliberate release by individuals | Individual release: deliberate release by individuals |
| Induces novel behavioural or eco-physiological responses | Induces novel behavioural or eco-physiological responses |
| Infaunal | Infaunal |
| Infralittoral | Infralittoral |
| InhalentSiphon | Inhalent siphon |
| Inquilinist | Inquilinist |
| Instar | Instar |
| Intermediary | Intermediary |
| Internal | Internal |
| Interstitial | Interstitial |
| Introduced Species Catalog | Introduced Species Catalog |
| Introduced country and/or sea area | Introduced country and/or sea area |
| Introduction unverified | Introduction unverified |
| Introvert | Introvert |
| Invasive | Invasive |
| Invasiveness | Invasiveness |
| Invasiveness Not specified | Invasiveness Not specified |
| Invasiveness Uncertain | Invasiveness Uncertain |
| Isogamous | Isogamous |
| Isomorphic | Isomorphic |
| Iteroparous | Iteroparous (polytely) |
| JetPropulsion | Jet propulsion |
| Jumper/Hopper | Jumper/Hopper |
| Juvenile | Juvenile |
| Juveniles | Juveniles |
| Keratinous | Keratinous |
| Kleptoparasitism | Kleptoparasitism |
| Lagoon | Isolated saline water (lagoon) |
| Lanceolate | Lanceolate |
| LargeBoulders | Large or very large boulders |
| LargeInsectColonies | Large (insect colonies) |
| Larva | Larva |
| LarvalJuvenileDevelopment | Larval and juvenile development |
| LarvalSettlement | Larval settlement period |
| LarvalStageDuration | Duration of larval stage |
| LarvalSttlementSubstratum | Larval settlement substratum |
| LeastConcern | Least Concern (LC) |
| Lecithotrophic | Lecithotrophic |
| LifeCycle | Life cycle |
| LifeSpan | Life span |
| Lifehistory | Life history |
| Lifestage | Life stages |
| Lithotomous | Lithotomous |
| Locally common | Locally common |
| Location Type | Location Type |
| Lophophore | Lophophore |
| Loss of aquaculture/commercial/recreational harvest or gain | Loss of aquaculture/commercial/recreational harvest or gain |
| Loss of public/tourist amenity | Loss of public/tourist amenity |
| LowerCircalittoral | Lower circalittoral |
| LowerInfralittoral | Lower infralittoral |
| LowerLittoral | Lower littoral |
| LowerLittoralFringe | Lower littoral fringe |
| Lures | Lures |
| MSFDIndicators | MSFD Indicators |
| Macroalgae | Macroalgae |
| Macrobiota | Macrobiota [2.0 - 200 mm] |
| Maerl | Maerl |
| Management recorded | Management recorded |
| Marine | Marine |
| MarineBirdAbundance | Marine bird abundance (B1) |
| MarineBirdBreedingSuccessFailure | Marine Bird Breeding Success / Failure (B3) |
| MarineMammalBycatch | Marine mammal bycatch (M6) |
| MarineSalinity | Marine |
| Massive | Massive |
| Mat | Mat |
| MediumCleanSand | Medium clean sand |
| Medusiform | Medusiform/Medusoid |
| Megabiota | Megabiota [> 200 mm] |
| Megalopa | Megalopa |
| Meiobiota | Meiobiota [0.2 - 2.0 mm] |
| Mesohaline | Mesohaline |
| Mesopelagic | Mesopelagic (200-1000 m) |
| Metanauplius | Metanauplius |
| Microbiota | Microbiota [<0.2 mm] |
| MidEulittoral | Mid littoral |
| Migratory | Migration (migratory) |
| Mitraria | Mitraria |
| Mixed | Mixed |
| MixedCalcareousMaterial | Mixed Calcareous Material |
| Mixotroph | Mixotroph |
| Mobile | Mobile |
| Mobility | Mobility |
| ModeOfLife | Mode of Life |
| ModeratelyExposed | Moderately exposed |
| ModeratelyStrong | Moderately strong |
| Modular | Modular |
| Monoculture | Monoculture |
| Monoecious | Hermaphrodite (monoecious) |
| Monoraphidioid | Monoraphidioid |
| MouthParts | Mouth parts |
| Movement | Movement |
| MucusMesh | Mucus mesh or net |
| Mud | Mud |
| MudSandyMud | Mud and sandy mud |
| MuddyGravel | Muddy gravel |
| MuddySand | Muddy sand |
| MuddySandyGravel | Muddy sandy gravel |
| MullersLarva | Muller's larva |
| Multivoltine | Multivoltine |
| Muscular Contraction (body length) | Muscular contraction (body length) |
| MuscularAxialProboscis | Muscular axial proboscis |
| MutualistMutualism | Mutualist (mutualism) |
| Native | Native |
| Native - Endemic | Native - Endemic |
| Native - Non-endemic | Native - Non-endemic |
| Native country and/or native sea area | Native country and/or native sea area |
| Natural dispersal | Natural dispersal |
| Nauplius | Nauplius |
| NearThreatened | Near Threatened (NT) |
| Nectochaeta | Nectochaeta |
| Nekton | Nektonic (nekton) |
| Neritic | Neritic |
| Neustonic | Neustonic |
| NoDiapause | None |
| NoOviparousCare | No care |
| NoViviparousCare | No care |
| NonBrooding | Non-brooding |
| NonMigratoryResident | Non-migratory (resident) |
| NonSelfing | Non-selfing |
| NonSolidCement | Non-solid; cement |
| NonSolidParticlesComp | Non-solid; particles |
| NonTerritorial | Non-Territorial |
| Nonfeeding | Non-Feeding |
| Not invasive | Not invasive |
| NotEvaluated | Not Evaluated (NE) |
| OSPARCommonIndicators | OSPAR Biodiversity Common Indicators |
| OSPARListOfThreatenedAndOrDecliningSpeciesAndHabitats | OSPAR List of Threatened and/or Declining Species and Habitats |
| OSPARRegionIArcticWaters | OSPAR Region I: Arctic Waters |
| OSPARRegionIIGreaterNorthSea | OSPAR Region II: Greater North Sea |
| OSPARRegionIIICelticSeas | OSPAR Region III: Celtic Seas |
| OSPARRegionIVBayOfBiscayAndIberianCoast | OSPAR Region IV: Bay of Biscay and Iberian Coast |
| OSPARRegionVWiderAtlantic | OSPAR Region V: Wider Atlantic |
| Occurrence | Occurrence |
| Occurrence Not specified | Occurrence Not specified |
| Oceanic | Oceanic |
| Of concern | Of concern |
| OffshoreSeabed | Offshore seabed |
| Oligohaline | Oligohaline |
| Omnivore | Omnivore |
| OntogeneticMigration | Ontogenetic migration |
| Oogamous | Oogamous |
| OpenCoast | Open coast |
| OpenEndedVentilation | Open-ended ventilation |
| Ophiopluteus | Ophiopluteus |
| OralPodia | Oral podia |
| Organic | Organic |
| Origin | Origin |
| Origin uncertain | Origin uncertain |
| Origin unknown | Origin unknown |
| Other | Other |
| Other impact - undefined or uncertain | Other impact - undefined or uncertain |
| OtherSpecies | Other species |
| Outcompetes native species for resources and/or space | Outcompetes native species for resources and/or space |
| OvalCylinder | Oval cylinder |
| Overhangs | Overhang |
| Oviparous | Oviparous |
| OviparousCare | Parental Care |
| Ovoviviparous | Ovoviviparous |
| Palps | Palps |
| Papillae | Papillae or tube feet |
| ParallelepipedRhomboid | Parallelepiped (rhomboid) |
| Parasite | Parasitic |
| ParasiticFeeding | Parasitic |
| Parasitoid | Parasitoid |
| Parenchymella | Parenchymella |
| Passive | Passive |
| PassiveDrifter | Passive drifter |
| Pathogen/parasite or carrier of a pathogen/parasite | Pathogen/parasite or carrier of a pathogen/parasite |
| Pathway/vector Other | Pathway/vector Other |
| Pathway/vector Unknown | Pathway/vector Unknown |
| Pathways/vector | Pathways/vector |
| Pattering | Pattering |
| Pebbles | Pebbles |
| Pediveliger | Pediveliger |
| Pelagic | Pelagic |
| Pelagosphaera | Pelagosphaera |
| Penicillate | Penicillate |
| PermanentHermaphrodite | Permanent (synchronous) hermaphrodite |
| Phagocytosis | Phagocytosis |
| Phosphatic | Phosphatic |
| Photoautotroph | Photoautotroph |
| PhotosyntheticPigment | Photosynthetic pigment(s) |
| Physiography | Physiography |
| Physiology | Physiology |
| PickingfromWaterSurface | Picking from the water surface |
| PiercingToxic | Piercing |
| Pilidium | Pilidium |
| Pinnate | Pinnate |
| PinnateBranching | Pinnate or branching |
| Pisciform | Pisciform |
| Plankton | Planktonic (plankton) |
| PlanktonBiomassAndOrAbundance | Plankton biomass and/or abundance (PH2) |
| Planktotrophic | Planktotrophic |
| Plant introductions: accidental with deliberate plant translocations | Plant introductions: accidental with deliberate plant translocations |
| Plant introductions: deliberate translocation of plant species | Plant introductions: deliberate translocation of plant species |
| Planula | Planula |
| Pleustonic | Pleustonic |
| PlungeDiving | Plunge Diving |
| Plunging | Plunging |
| Pollination | Pollination (plants) |
| Polyhaline | Polyhaline |
| Pouncing | Pouncing |
| Predator | Predator (Hunter) |
| Present/controlled | Present/controlled |
| Probing | Probing |
| ProportionOfLargeFish | Proportion of large fish (Large Fish Index) (FC2) |
| Protandrous | Protandrous |
| Protogynous | Protogynous |
| Protonymphon | Protonymphon |
| Protozoea | Protozoea |
| Province | Province |
| PseudoArrhenotoky | Pseudo-arrhenotoky |
| PursuitDiving | Pursuit Diving |
| PursuitHunterCooperative | Pursuit hunter (co-operative) |
| PursuitHunterIndividual | Pursuit Hunter (individual) |
| PursuitPlunging | Pursuit Plunging |
| QualitativeBodySize | Qualitative body size |
| QuantitativeBodySize | Quantitative body size |
| Radial | Radial |
| Radulae | Radulae |
| Rare | Rare |
| Rare to common | Rare to common |
| Rare to dominant | Rare to dominant |
| Rasping | Rasping |
| Rataria | Rataria |
| Recorded in error | Recorded in error |
| RecoveryInThePopulationAbundanceOfSensitiveFishSpecies | Recovery in the population abundance of sensitive fish species (FC1) |
| Recreational equipment: accidental with recreational equipment | Recreational equipment: accidental with recreational equipment |
| ReefBuilding | Reef-building |
| Regenerator | Regenerator |
| Reported | Reported |
| ReproductiveFrequency | Reproductive Frequency |
| ReproductiveSeason | Reproductive season |
| ReproductiveType | Reproductive type |
| Reticulate | Reticulate |
| RiaVoe | Ria or voe |
| Robust | Robust |
| Rockpools | Rockpool |
| RotationalEllipsoid | Rotational ellipsoid |
| Salinity | Salinity (regime) |
| Saltmarsh | Salt marsh |
| Sand | Sand |
| SandMuddySand | Sand and muddy sand |
| SandyGravel | Sandy gravel |
| SandyMud | Sandy mud |
| Saprophage | Saprophage |
| Scavenger | Scavenger |
| Scientific research: accidental release with research activities | Scientific research: accidental release with research activities |
| Scientific research: deliberate release with research activities | Scientific research: deliberate release with research activities |
| SeaIce | Sea ice |
| SeaLoch | Sea loch (Scotland), sea lough (Ireland) |
| Seagrass | Seagrass |
| SealAbundanceAndDistribution | Seal Abundance and Distribution (M3) |
| Seaplanes: accidental as attached or free-living fouling organisms | Seaplanes: accidental as attached or free-living fouling organisms |
| SearcherForager | Searcher/Forager |
| SeasonalEnvironment | Seasonal (environment) |
| SeasonalFeeding | Seasonal (feeding) |
| SeasonalReproduction | Seasonal (reproduction) |
| SedimentReworking | Sediment reworking |
| SedimentSoft | Soft (sediment) |
| SedimentSurface | Sediment surface |
| Seeds | Seeds (plants) |
| Seizing | Seizing |
| SelfFertilizing | Self-fertilizing |
| Semelparous | Semelparous (monotely) |
| Semivoltine | Semivoltine |
| SequentialHermaphrodite | Sequential hermaphrodite |
| Sessile | Sessile |
| Setose | Setose (Hairy) |
| SexualReproduction | Sexual reproduction |
| ShallowPlunging | Shallow plunging |
| Sheltered | Sheltered |
| Ships: accidental as attached or free-living fouling organisms | Ships: accidental as attached or free-living fouling organisms |
| Ships: accidental associated with cargo | Ships: accidental associated with cargo |
| Ships: accidental with ballast water, sea water systems, live wells or other deck basins | Ships: accidental with ballast water, sea water systems, live wells or other deck basins |
| Ships: accidental with solid ballast | Ships: accidental with solid ballast |
| Ships: general | Ships: general |
| Shrub | Shrub |
| Siliceous | Siliceous |
| SimpleAxialProboscis | Simple axial proboscis |
| SizeCompositionInFishCommunities | Size composition in fish communities (FW3) |
| Skimming | Skimming |
| SmallBoulders | Small boulders |
| SmallTribePridePackPod | Small (tribe/pride/pack/pod) |
| Snatching | Snatching |
| Sociability | Sociability |
| SocialGroup | Social group |
| Solid | Solid |
| Solitary | Solitary |
| Sometimes present | Sometimes present |
| Source country and/or sea area | Source country and/or sea area |
| SpecialisedStage | Specialised stage |
| Species Importance To Society | Species' Importance to Society |
| Spermcast | Spermcast |
| Sphere | Sphere (spherical) |
| SplashZone | Splash zone |
| Sponginous | Sponginous |
| Sporogenesis | Sporogenesis |
| SprayZone | Spray Zone |
| Stacks | Stacks |
| StandardLength | Standard length (SL) |
| Stellate | Stellate |
| StickyMucus | Sticky or mucus covered |
| Stinging | Stinging |
| StraitSound | Strait or sound |
| Strandline | Strand-line |
| Straplike | Straplike/Ribbonlike |
| Strong | Strong |
| StunAttack | Stun attack |
| Sublittoral | Sublittoral |
| SublittoralFringe | Sublittoral fringe |
| Substratum | Substratum |
| SubstratumHabitat | Substratum |
| SubsurfaceDepositFeeder | Sub-surface deposit feeder |
| SubsurfaceSeizing | Subsurface seizing |
| Suctorial | Suctorial (sucker bearing) |
| Support | Support |
| SupportingStructuresEnclosures | Supporting Structures and Enclosures |
| Supralittoral | Supralittoral |
| SurfaceDabbling | Surface dabbling |
| SurfaceDepositFeeder | Surface deposit feeder |
| SurfaceDipping | Surface dipping |
| SurfaceDiving | Surface Diving |
| SurfacePlunging | Surface plunging |
| SurfaceSeizing | Surface seizing |
| SuspensionFeeder | Suspension feeder |
| Swimmer | Swimmer |
| Swimming | Swimming |
| SymbiontContribution | Symbiont contribution |
| Symbiotic | Symbiotic |
| Tadpole | Tadpole |
| Talons | Talons |
| TaxonSpecificBodySize | Taxon specific body size |
| TaxonSpecificBodySizeFish | Taxon specific body size: Fish |
| TaxonSpecificBodySizeMacroAlgae | Taxon specific body size: Macroalgae |
| TempRange | Temperature range tolerated |
| TemporaryAttachment | Temporary attachment |
| Tentacles | Tentacles |
| Terrestrial | Terrestrial |
| Territorial | Territorial |
| TidalStrength | Tidal streams and water flow (range) |
| Tolerance | Tolerance |
| TotalLength | Total length (TL) |
| Trapezoid | Trapezoid/Trapezium |
| Traps | Traps |
| TrendsInNewRecordsOfNonIndigenousSpeciesIntroducedByHumanActivities | Trends in New Records of Non-Indigenous Species (NIS) Introduced by Human Activities (NIS) |
| TruncatedCone | Truncated cone |
| Tubicolous | Tube dwelling (tubicolous) |
| Turbinate | Turbinate |
| Turf | Turf |
| TypeI | Type I |
| TypeII | Type II |
| TypeIII | Type III |
| TypeIV | Type IV |
| TypeV | Type V |
| TypicalSpeciesComposition | Typical species composition (BH1) |
| UltraSheltered | Ultra sheltered |
| Under10 | <10m |
| UnderBoulders | Under boulders |
| UnderIce | Under ice |
| UnderwaterSeizing | Underwater seizing |
| UnderwaterSwimming | Underwater swimming |
| Unitary | Unitary |
| Univoltine | Univoltine |
| UpperCircalittoral | Upper circalittoral |
| UpperEulittoral | Upper littoral |
| UpperInfralittoral | Upper infralittoral |
| UpperLittoralFringe | Upper littoral fringe |
| UpwardsConveyor | Upward conveyor |
| Variable | Variable |
| Vegetation | Vegetation |
| Vegetative | Vegetative reproduction |
| Veliger | Veliger |
| VentralBuccalOrgan | Ventral buccal organ |
| VentralMuscularProboscis | Ventral muscular proboscis |
| Vermiform | Vermiform |
| VermiformAnnulated | Vermiform annulated |
| VermiformSegmented | Vermiform segmented |
| VermiformUnsegmented | Vermiform Unsegmented |
| VerticalBiologicalZone | Vertical biological zone (or zonation) |
| VeryExposed | Very exposed |
| VerySheltered | Very sheltered |
| VeryStrong | Very strong |
| VeryWeak | Very weak |
| Viviparous | Viviparous |
| ViviparousCare | Parental care |
| Vulnerable | Vulnerable (VU) |
| WadinginShallowWater | Wading in shallow water |
| Water abstraction or nuisance fouling | Water abstraction or nuisance fouling |
| WaveExposed | Wave exposed |
| WaveExposure | Wave exposure |
| WaveSheltered | Wave sheltered |
| Weak | Weak |
| Whiplike | Whiplike |
| Width | Width |
| WidthOfDisc | Width of disc (WD) |
| Wingspan | Wingspan |
| Zoea | Zoea |
