Common name	Scientific name	Family	Status	Weight	Countries
Immortal jelly	Turritopsis dohrnii	Oceaniidae	Not recorded	Not recorded	Not recorded
Little sail	Velella velella	Porpitidae	Not recorded	Not recorded	Not recorded
Green hydra	Hydra viridissima	Hydridae	Not recorded	Not recorded	Not recorded
Grey hydra	Hydra oligactis	Hydridae	Not recorded	Not recorded	Not recorded
White hydra	Hydra vulgaris	Hydridae	Not recorded	Not recorded	Not recorded
Blue button	Porpita porpita	Porpitidae	Not recorded	Not recorded	Not recorded
Fire coral	Millepora dichotoma	Milleporidae	Not recorded	Not recorded	Not recorded
Fire coral	Millepora alcicornis	Milleporidae	Not recorded	Not recorded	Not recorded
Fire coral	Millepora platyphylla	Milleporidae	Not recorded	Not recorded	Not recorded
Hydroid	Cordylophora caspia	Cordylophoridae	Not recorded	Not recorded	Not recorded
Fire coral	Millepora complanata	Milleporidae	Not recorded	Not recorded	Not recorded
Fire coral	Millepora exaesa	Milleporidae	Not recorded	Not recorded	Not recorded
Fire coral	Millepora tenera	Milleporidae	Not recorded	Not recorded	Not recorded
Ringed tubularia	Ectopleura larynx	Tubulariidae	Not recorded	Not recorded	Not recorded
Snailfur	Hydractinia echinata	Hydractiniidae	Not recorded	Not recorded	Not recorded
Oaten pipe	Tubularia indivisa	Tubulariidae	Not recorded	Not recorded	Not recorded
Crimson jelly	Turritopsis rubra	Oceaniidae	Not recorded	Not recorded	Not recorded
Grapevine hydroid	Eudendrium racemosum	Eudendriidae	Not recorded	Not recorded	Not recorded
Stickhydroid	Eudendrium ramosum	Eudendriidae	Not recorded	Not recorded	Not recorded
Sea nettle	Pennaria disticha	Pennariidae	Not recorded	Not recorded	Not recorded
Giant bell jelly	Scrippsia pacifica	Corynidae	Not recorded	Not recorded	Not recorded
Tubular sponge hydroid	Zyzzyzus warreni	Tubulariidae	Not recorded	Not recorded	Not recorded
Stickyhydroid	Bougainvillia muscus	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Club polyps	Clava multicornis	Hydractiniidae	Not recorded	Not recorded	Not recorded
Lace coral	Distichopora violacea	Stylasteridae	Not recorded	Not recorded	Not recorded
Sea fir	Eudendrium rameum	Eudendriidae	Not recorded	Not recorded	Not recorded
Shell-mimic hydroid	Hydrocorella africana	Hydractiniidae	Not recorded	Not recorded	Not recorded
Box fire coral	Millepora squarrosa	Milleporidae	Not recorded	Not recorded	Not recorded
Clinging jellyfish	Nemopsis bachei	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Clapper medusa	Sarsia tubulosa	Corynidae	Not recorded	Not recorded	Not recorded
Noble coral	Stylaster nobilis	Stylasteridae	Not recorded	Not recorded	Not recorded
Gnome's hat hydroid	Candelabrum capensis	Candelabridae	Not recorded	Not recorded	Not recorded
Constricted jellyfish	Catablema vesicarium	Pandeidae	Not recorded	Not recorded	Not recorded
Nodding hydroid	Corymorpha nutans	Corymorphidae	Not recorded	Not recorded	Not recorded
Red flowerhead polyp	Coryne pusilla	Corynidae	Not recorded	Not recorded	Not recorded
Tubular hydroid	Ectopleura crocea	Tubulariidae	Not recorded	Not recorded	Not recorded
Red stickhydroid	Eudendrium carneum	Eudendriidae	Not recorded	Not recorded	Not recorded
Alberta hydra	Hydra canadensis	Hydridae	Not recorded	Not recorded	Not recorded
High-spined commensal hydroid	Hydractinia altispina	Hydractiniidae	Not recorded	Not recorded	Not recorded
Fire coral	Millepora foveolata	Milleporidae	Not recorded	Not recorded	Not recorded
Red paper lantern jelly	Pandea rubra	Pandeidae	Not recorded	Not recorded	Not recorded
Grey fan hydroid	Solanderia procumbens	Solanderiidae	Not recorded	Not recorded	Not recorded
Lace coral	Stylaster californicus	Stylasteridae	Not recorded	Not recorded	Not recorded
Aquarium medusa	Cladonema radiatum	Cladonematidae	Not recorded	Not recorded	Not recorded
Indian Ocean shell-encrusting hydroid	Clavactinia gallensis	Hydractiniidae	Not recorded	Not recorded	Not recorded
White stickhydroid	Eudendrium album	Eudendriidae	Not recorded	Not recorded	Not recorded
California stickhydroid	Eudendrium californicum	Eudendriidae	Not recorded	Not recorded	Not recorded
Slender stickhydroid	Eudendrium capillare	Eudendriidae	Not recorded	Not recorded	Not recorded
Balloon jelly	Halitholus cirratus	Pandeidae	Not recorded	Not recorded	Not recorded
Slender hydra	Hydra circumcincta	Hydridae	Not recorded	Not recorded	Not recorded
Fire coral	Millepora striata	Milleporidae	Not recorded	Not recorded	Not recorded
Red-eye medusa	Polyorchis penicillatus	Corynidae	Not recorded	Not recorded	Not recorded
Seafan hydroid	Solanderia gracilis	Solanderiidae	Not recorded	Not recorded	Not recorded
Hanging stomach jelly	Stomotoca atra	Pandeidae	Not recorded	Not recorded	Not recorded
Lace coral	Stylaster roseus	Stylasteridae	Not recorded	Not recorded	Not recorded
Fairypalm hydroid	Corymorpha palma	Corymorphidae	Not recorded	Not recorded	Not recorded
Lace coral	Distichopora vervoorti	Stylasteridae	Not recorded	Not recorded	Not recorded
Pink-mouth hydroid	Ectopleura marina	Tubulariidae	Not recorded	Not recorded	Not recorded
Pourtalès's lace hydrocoral	Errinopora pourtalesii	Stylasteridae	Not recorded	Not recorded	Not recorded
Annulate stickhydroid	Eudendrium annulatum	Eudendriidae	Not recorded	Not recorded	Not recorded
Annulate sticky hydroid	Eudendrium vaginatum	Eudendriidae	Not recorded	Not recorded	Not recorded
Orange hydroid	Garveia annulata	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Jersey hydra	Hydra hymanae	Hydridae	Not recorded	Not recorded	Not recorded
Oregon hydra	Hydra oregona	Hydridae	Not recorded	Not recorded	Not recorded
Utah hydra	Hydra utahensis	Hydridae	Not recorded	Not recorded	Not recorded
Tube hydrocoral	Pliobothrus tubulatus	Stylasteridae	Not recorded	Not recorded	Not recorded
Solitary gorgonian hydroid	Ralpharia gorgoniae	Tubulariidae	Not recorded	Not recorded	Not recorded
Corrugated lace hydrocoral	Stylantheca papillosa	Stylasteridae	Not recorded	Not recorded	Not recorded
Common lace hydrocoral	Stylaster campylecus	Stylasteridae	Not recorded	Not recorded	Not recorded
Fuchsia lace hydrocoral	Stylaster venustus	Stylasteridae	Not recorded	Not recorded	Not recorded
Pink branching lace hydrocoral	Stylaster verrillii	Stylasteridae	Not recorded	Not recorded	Not recorded
Rope grass hydroid	Calyptospadix cerulea	Bougainvilliidae	Not recorded	Not recorded	Not recorded
One-armed jelly	Corymorpha pendula	Corymorphidae	Not recorded	Not recorded	Not recorded
Hydroid	Pachycordyle michaeli	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Miller hydractinia	Schuchertinia milleri	Hydractiniidae	Not recorded	Not recorded	Not recorded
Raspberry hydroid	Zyzzyzus rubusidaeus	Tubulariidae	Not recorded	Not recorded	Not recorded
Smoothspined snailfur	Podocoryna carnea	Hydractiniidae	Not recorded	Not recorded	Not recorded
Hairy jelly	Spirocodon saltatrix	Corynidae	Not recorded	Not recorded	Not recorded
Not recorded	Acaulis primarius	Acaulidae	Not recorded	Not recorded	Not recorded
Not recorded	Acauloides ammisatum	Acaulidae	Not recorded	Not recorded	Not recorded
Not recorded	Acauloides ilonae	Acaulidae	Not recorded	Not recorded	Not recorded
Not recorded	Adelopora alveolata	Stylasteridae	Not recorded	Not recorded	Not recorded
Not recorded	Adelopora crassilabrum	Stylasteridae	Not recorded	Not recorded	Not recorded
Not recorded	Adelopora fragilis	Stylasteridae	Not recorded	Not recorded	Not recorded
Not recorded	Adelopora moseleyi	Stylasteridae	Not recorded	Not recorded	Not recorded
Not recorded	Adelopora pseudothyron	Stylasteridae	Not recorded	Not recorded	Not recorded
Not recorded	Adelopora robusta	Stylasteridae	Not recorded	Not recorded	Not recorded
Not recorded	Adelopora rosea	Stylasteridae	Not recorded	Not recorded	Not recorded
Not recorded	Adelopora stichopora	Stylasteridae	Not recorded	Not recorded	Not recorded
Not recorded	Allorathkea ankeli	Rathkeidae	Not recorded	Not recorded	Not recorded
Not recorded	Allorathkea macrogastrica	Rathkeidae	Not recorded	Not recorded	Not recorded
Not recorded	Amphinema australis	Pandeidae	Not recorded	Not recorded	Not recorded
Not recorded	Amphinema biscayana	Pandeidae	Not recorded	Not recorded	Not recorded
Not recorded	Amphinema bouilloni	Pandeidae	Not recorded	Not recorded	Not recorded
Not recorded	Amphinema calcariformis	Pandeidae	Not recorded	Not recorded	Not recorded
Not recorded	Amphinema cheshirei	Pandeidae	Not recorded	Not recorded	Not recorded
Not recorded	Amphinema dinema	Pandeidae	Not recorded	Not recorded	Not recorded
Not recorded	Amphinema globogona	Pandeidae	Not recorded	Not recorded	Not recorded
Not recorded	Amphinema gordini	Pandeidae	Not recorded	Not recorded	Not recorded
Not recorded	Amphinema krampi	Pandeidae	Not recorded	Not recorded	Not recorded
Not recorded	Amphinema modernisme	Pandeidae	Not recorded	Not recorded	Not recorded
Not recorded	Amphinema nanhainensis	Pandeidae	Not recorded	Not recorded	Not recorded
Not recorded	Amphinema physophorum	Pandeidae	Not recorded	Not recorded	Not recorded
Not recorded	Amphinema platyhedos	Pandeidae	Not recorded	Not recorded	Not recorded
Not recorded	Amphinema rollinsi	Pandeidae	Not recorded	Not recorded	Not recorded
Not recorded	Amphinema rubrum	Pandeidae	Not recorded	Not recorded	Not recorded
Not recorded	Amphinema rugosum	Pandeidae	Not recorded	Not recorded	Not recorded
Not recorded	Amphinema tsingtauensis	Pandeidae	Not recorded	Not recorded	Not recorded
Not recorded	Amphinema turrida	Pandeidae	Not recorded	Not recorded	Not recorded
Not recorded	Annatiara affinis	Pandeidae	Not recorded	Not recorded	Not recorded
Not recorded	Apatizanclea divergens	Zancleidae	Not recorded	Not recorded	Not recorded
Not recorded	Apatizanclea exposita	Zancleidae	Not recorded	Not recorded	Not recorded
Not recorded	Apatizanclea mayeri	Zancleidae	Not recorded	Not recorded	Not recorded
Not recorded	Arachnopora argentea	Milleporidae	Not recorded	Not recorded	Not recorded
Not recorded	Astya aspidopora	Stylasteridae	Not recorded	Not recorded	Not recorded
Not recorded	Astya subviridis	Stylasteridae	Not recorded	Not recorded	Not recorded
Not recorded	Asyncoryne philippina	Asyncorynidae	Not recorded	Not recorded	Not recorded
Not recorded	Asyncoryne ryniensis	Asyncorynidae	Not recorded	Not recorded	Not recorded
Not recorded	Atractylis bitentaculata	Proboscidactylidae	Not recorded	Not recorded	Not recorded
Not recorded	Australomedusa baylii	Australomedusidae	Not recorded	Not recorded	Not recorded
Not recorded	Australomedusa thrombolites	Australomedusidae	Not recorded	Not recorded	Not recorded
Not recorded	Axopora alpina	Axoporidae	Not recorded	Not recorded	Not recorded
Not recorded	Axopora arborea	Axoporidae	Not recorded	Not recorded	Not recorded
Not recorded	Axopora cleithrideum	Axoporidae	Not recorded	Not recorded	Not recorded
Not recorded	Axopora kolosvaryi	Axoporidae	Not recorded	Not recorded	Not recorded
Not recorded	Axopora mammilosa	Axoporidae	Not recorded	Not recorded	Not recorded
Not recorded	Axopora micropora	Axoporidae	Not recorded	Not recorded	Not recorded
Not recorded	Axopora parisiensis	Axoporidae	Not recorded	Not recorded	Not recorded
Not recorded	Axopora paucipora	Axoporidae	Not recorded	Not recorded	Not recorded
Not recorded	Axopora pyriformis	Axoporidae	Not recorded	Not recorded	Not recorded
Not recorded	Axopora ramea	Axoporidae	Not recorded	Not recorded	Not recorded
Not recorded	Axopora solanderi	Axoporidae	Not recorded	Not recorded	Not recorded
Not recorded	Balella mirabilis	Balellidae	Not recorded	Not recorded	Not recorded
Not recorded	Barnettia caprai	Pandeidae	Not recorded	Not recorded	Not recorded
Not recorded	Bathycodon pyramis	Corynidae	Not recorded	Not recorded	Not recorded
Not recorded	Bertratis ciurcae	Not recorded	Not recorded	Not recorded	Not recorded
Not recorded	Bibrachium euplectellae	Not recorded	Not recorded	Not recorded	Not recorded
Not recorded	Bicorona elegans	Corynidae	Not recorded	Not recorded	Not recorded
Not recorded	Bimeria australis	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bimeria belgicae	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bimeria corynopsis	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bimeria fluminalis	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bimeria lutea	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bimeria pygmaea	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bimeria rigida	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bimeria vestita	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Boeromedusa auricogonia	Boeromedusidae	Not recorded	Not recorded	Not recorded
Not recorded	Bougainvillia aberrans	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bougainvillia aurantiaca	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bougainvillia balei	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bougainvillia bitentaculata	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bougainvillia bougainvillei	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bougainvillia britannica	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bougainvillia carolinensis	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bougainvillia chenyapingii	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bougainvillia crassa	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bougainvillia dimorpha	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bougainvillia frondosa	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bougainvillia fulva	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bougainvillia glorietta	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bougainvillia inaequalis	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bougainvillia involuta	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bougainvillia jyrama	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bougainvillia lamellata	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bougainvillia leizhouensis	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bougainvillia longicirra	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bougainvillia longistyla	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bougainvillia macloviana	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bougainvillia marfenini	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bougainvillia meinertiae	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bougainvillia mertensii	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bougainvillia multicilia	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bougainvillia multitentaculata	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bougainvillia muscoides	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bougainvillia niobe	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bougainvillia pagesi	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bougainvillia papillaris	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bougainvillia paraplatygaster	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bougainvillia platygaster	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bougainvillia principis	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bougainvillia prolifera	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bougainvillia pyramidata	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bougainvillia reticulata	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bougainvillia robusta	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bougainvillia rugosa	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bougainvillia simplex	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bougainvillia superciliaris	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bougainvillia triestina	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bougainvillia trinema	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bougainvillia vervoorti	Bougainvilliidae	Not recorded	Not recorded	Not recorded
Not recorded	Bouillonactinia carcinicola	Hydractiniidae	Not recorded	Not recorded	Not recorded
Not recorded	Bouillonactinia hooperii	Hydractiniidae	Not recorded	Not recorded	Not recorded
Not recorded	Bouillonactinia misakiensis	Hydractiniidae	Not recorded	Not recorded	Not recorded
Not recorded	Bouillonactinia multigranosi	Hydractiniidae	Not recorded	Not recorded	Not recorded
Not recorded	Bouillonia cornucopia	Tubulariidae	Not recorded	Not recorded	Not recorded
Not recorded	Bouillonia denhartogi	Tubulariidae	Not recorded	Not recorded	Not recorded
Not recorded	Branchiocerianthus imperator	Corymorphidae	Not recorded	Not recorded	Not recorded
Not recorded	Branchiocerianthus italicus	Corymorphidae	Not recorded	Not recorded	Not recorded
Not recorded	Branchiocerianthus mirabilis	Corymorphidae	Not recorded	Not recorded	Not recorded
Not recorded	Branchiocerianthus norvegicus	Corymorphidae	Not recorded	Not recorded	Not recorded