Order Hydroida
Order Hydroida (3+ Suborders, 36+ Families, 202+ Genera, 585+ Species)
Hydroides
- Suborder Anthomedusae (16+ Families, 80+ Genera, 250+ Species)
- Family Hydridae (1+ Genera, 1+ Species)
- Family Corymorphidae (12+ Genera, 20+ Species)
- Genus Corymorpha (1+)
One-armed Jellyfish
- Corymorpha nutans
- Corymorpha abyssalis
- Corymorpha annulicornis
- Corymorpha appelloefi
- Corymorpha glacialis
- Corymorpha groenlandica
- Corymorpha nana
- Genus Euphysa (1+)
- Genus Boreohydra (1+)
- Genus Steenstrupia (1+)
- Genus Eucodonium (1+)
- Genus Amalthaea (1+)
- Genus Branchiocerianthus (2+)
- Branchiocerianthus italicus
- Branchiocerianthus norgegicus
- Genus Eugotoea (1+)
- Genus Euphysora (2+)
- Euphysora annulata
- Euphysora bigelowi
- Genus Paragotoea (1+)
- Genus Plotocnide (1+)
- Genus Vannuccia (1+)
- Family Tubulariidae (4+ Genera, 15+ Species)
- Genus Tubularia (8+)
- Tubularia indivisa
Tall Tubularian
- Tubularia crocea
Tubularian Hydroid
- Tubularia larynx
Ringed Tubularian
- Tubularia bellis
- Tubularia ceratogyne
- Tubularia cornucopia
- Tubularia mesembryanthemum
- Tubularia regalis
- Genus Ectopleura (5+)
- Ectopleura dumortieri
- Ectopleura minerva
- Ectopleura petalina
- Ectopleura sacculifera
- Ectopleura wrighti
- Genus Hybocodon (1+)
One-armed Jellyfish
- Genus Rhabdoon (1+)
- Family Corynidae (7+ Genera, 35+ Species)
- Genus Coryne (11+)
- Coryne pusilla
- Coryne brevicornis
- Coryne caespes
- Coryne clavata
- Coryne epizoica
- Coryne filiformis
- Coryne fucicola
- Coryne graeffei
- Coryne hincksi
- Coryne muscoides
- Coryne pintneri
- Genus Actigia (1+)
- Genus Sarsia (12+)
Clapper Hydromedusa
- Sarsia loveni
- Sarsia eximia
- Sarsia gemmifera
- Sarsia prolifera
- Sarsia tubulosa
- Sarsia barentsi
- Sarsia occulta
- Sarsia pattersoni
- Sarsia piriformis
- Sarsia princeps
- Sarsia producta
- Sarsia striata
- Genus Sarsiella (1+)
- Genus Stauridiosarsia (2+)
- Stauridiosarsia producta
- Stauridiosarsia filiformis
- Genus Dipurena (6+)
- Dipurena halterata
- Dipurena ophiogaster
- Dipurena dolichogaster
- Dipurena reesi
- Dipurena simulans
- Dipurena spongicola
- Genus Dicodonium (2+)
- Dicodonium adriaticum
- Dicodonium ocellatum
- Family Zancleidae (1+ Genera, 2+ Species)
- Genus Zanclea (1+)
- Zanclea costata
- Zanclea sessilis
- Family Myriothelidae (1+ Genera, 1+ Species)
- Family Clavidae (8+ Genera, 16+ Species)
- Genus Clava (2+)
Club Hydroid
- Clava multicornis
- Clava squamata
- Genus Merona (3+)
- Merona ibera
- Merona nematophorum
- Merona cornucopiae
- Genus Tubiclava (2+)
- Tubiclava lucerna
- Tubiclava fruticosa
- Genus Cordylophora (4+)
- Cordylophora inkermanica
- Cordylophora pusilla
- Cordylophora lacustris
- Cordylophora caspia
- Genus Corydendrium (2+)
- Corydendrium dispar
- Corydendrium parasiticum
- Genus Oceania (1+)
- Genus Rhizogeton (1+)
- Genus Turritopsis (1+)
- Family Hydractinidae (4+ Genera, 24+ Species)
- Genus Hydractinia (11+)
- Hydractinia echinata
Snail Fur
- Hydractinia aculeata
- Hydractinia allmani
- Hydractinia arctica
- Hydractinia calderi
- Hydractinia carica
- Hydractinia fucicola
- Hydractinia humilis
- Hydractinia monocarpa
- Hydractinia ornata
- Hydractinia serrata
- Genus Podocoryne (8+)
- Podocoryne areolata
- Podocoryne carnea
Smooth-spined Snail Fur
- Podocoryne borealis
- Podocoryne hartlaubi
- Podocoryne minima
- Podocoryne minuta
- Podocoryne proboscidea
- Podocoryne sarsi
- Genus Stylactis (4+)
- Stylactis claviformis
- Stylactis fuciola
- Stylactis inermis
- Stylactis pruvoti
- Genus Tregoubovia (1+)
- Family Trichydridae (1+ Genera, 1+ Species)
- Family Agalopheniidae (6+ Genera, 35+ Species)
- Genus Gymnangium (3+)
- Gymnangium hians
- Gymnangium montagui
- Gymnangium sinosum
- Genus Lytocarpia (4+)
- Lytocarpia niger
- Lytocarpia distans
- Lytocarpia myriophyllum
- Lytocarpia phyteuma
- Genus Macrohynchia (1+)
- Genus Nematocarpus (1+)
- Genus Streptocaulus (4+)
- Streptocaulus corneliusi
- Streptocaulus dollfusi
- Streptocaulus pectiniferus
- Streptocaulus sinuosus
- Genus Aglaophenia (12+)
Feathery Hydroid
- Aglaophenia acacia
- Aglaophenia elongata
- Aglaophenia harpago
- Aglaophenia kirchenpaueri
- Aglaophenia latecarinata
- Aglaophenia lophocarpa
- Aglaophenia octodonta
- Aglaophenia parvula
- Aglaophenia picardi
- Aglaophenia pluma
- Aglaophenia tubiformis
- Aglaophenia tubulifera
- Genus Cladocarpus (12+)
- Caldocarpus bicuspis
- Caldocarpus bonneviaei
- Caldocarpus boucheti
- Caldocarpus cartieri
- Caldocarpus cornutus
- Caldocarpus diana
- Caldocarpus formosus
- Caldocarpus integer
- Caldocarpus multiseptatus
- Caldocarpus paraventricosus
- Cladocarpus sigma
- Caldocarpus sinuosos
- Family Bougainvilliidae (14+ Genera, 41+ Species)
- Genus Bougainvillia (12+)
Bougainvillia Hydroid
- Bougainvillia charcoti
- Bougaimvillia flavida
- Bougainvillia macloviana
- Bougainvillia maniculata
- Bougainvillia multicilia
- Bougainvillia muscoides
- Bougainvillia ramosa
- Bougainvillia fulva
- Bougainvillia britannica
- Bougainvillia principis
- Bougainvillia muscus
- Bougainvillia pyramidata
- Bougainvillia rugosa
- Bougainvillia superciliaris
- Genus Aselomaris (2+)
- Aselomaris arenosa
- Aselomaris michaeli
- Genus Clavopsella (1+)
- Genus Dicoryne (3+)
- Dicoryne conybearei
- Dicoryne conferta
- Dicoryne flexuosa
- Genus Garveia (5+)
- Garveia nutans
- Garveia biscayana
- Garveia fanciscana
- Garveia grisea
- Genus Koellikerina (1+)
- Genus Bimeria (1+)
- Genus Lizzia (3+)
- Lizzia blondina
- Lizzia fulgurans
- Lizzia octostyla
- Genus Lizzella (1+)
- Genus Nemopsis (2+)
- Nemopsis bachei
- Nemopsis crucifera
- Genus Nubiella (1+)
- Genus Pachycordyle (1+)
- Genus Rhizorhagium (4+)
- Rhizorhagium album
- Rhizorhagium formosum
- Rhizorhagium roseum
- Rhizorhagium sarsii
- Genus Thamnostoma (2+)
- Thamnostoma dibalium
- Thamnostoma russelli
- Family Pandeidae (11+ Genera, 23+ Species)
- Genus Amphinema (5+)
- Amphinema dinema
- Amphinema rugosum
- Amphinema krampi
- Amphinema rubrum
- Amphinema turridum
- Genus Annatiara (1+)
- Genus Catablema (1+)
- Catablema vesicarium
Constricted jellyfish
- Genus Codonorchis (1+)
- Genus Halitholus (2+)
- Halitholus pauper
- Halitholus yoldiaarcticae
- Genus Leuckartiara (4+)
- Leuckartiara octona
- Leuckartiara abyssi
- Leuckartiara breviconis
- Leuckartiara nobilis
- Genus Merga (4+)
- Merga galleri
- Merga reesi
- Merga tergestina
- Merga tregoubovii
- Genus Neoturris (1+)
- Genus Octotiara (1+)
- Genus Pandea (2+)
- Pandea conica
- Pandea rubra
- Genus Stomotoca (1+)
- Family Eleutheriidae (2+ Genera, 7+ Species)
- Genus Staurocladida (4+)
- Staurocladida acuminata
- Staurocladida alternata
- Staurocladida bilateralis
- Staurocladida oahuensis
- Staurocladida portmanni
- Genus Eleutheria (1+)
- Eleutheria claparedei
- Eleutheria dichotoma
- Family Eudendriidae (2+ Genera, 22+ Species)
- Genus Eudendrium (21+)
- Eudendrium album
White Stick Hydroid
- Eudendrium capillare
- Eudendrium rameum
- Eudendrium ramosum
Stick Hydroids
- Eudendrium annulatum
- Eudendrium arbusculum
- Eudendrium armatum
- Eudendrium calceolatum
- Eudendrium carneum
Red Stick Hydroid
- Eudendrium cunninghami
- Eudendrium fragile
- Eudendrium glomeratum
- Eudendrium insigne
- Eudendrium merulum
- Eudendrium motzkossowskae
- Eudendrium planum
- Eudendrium racemosum
- Eudendrium teissieri
- Eudendrium tenellum
- Eudendrium vaginatum
- Eudendrium vervoorti
- Genus Myrionema (1+)
- Family Cladonemidae (1+ Genera, 1+ Species)
- Family Rathkeidae (1+ Genera, 1+ Species)
- Suborder Leptomedusae (17+ Families, 108+ Genera, 322+ Species)
- Family Laodiceidae (8+ Genera, 14+ Species)
- Genus Laodicea (4+)
- Laodicea bigelowi
- Laodicea chapmani
- Laodicea neptuna
- Laodicea ocellata
- Laodicea undulata
- Genus Krampella (2+)
- Krampella dubia
- Krampella tardenti
- Genus Melicertissa (1+)
- Genus Ptychogena (2+)
- Ptychogena crocea
- Ptychogena lactea
- Genus Staurodiscus (1+)
- Staurodiscus tetrastaurus
- Genus Staurostoma (1+)
- Genus Teclaia (1+)
- Genus Toxorchis (1+)
- Family Mitrocomidae (10+ Genera, 13+ Species)
- Genus Cosmetira (1+)
- Genus Cyclocanna (1+)
- Genus Foersteria (2+)
- Foersteria antoniae
- Foersteria araiae
- Genus Halopsis (1+)
- Genus Mitrocoma (1+)
- Genus Mitrocomella (2+)
- Mitrocomella brownei
- Mitrocomella polydiademata
- Genus Mitrocomium (1+)
- Genus Octogonade (1+)
- Genus Tiaropsidium (3+)
- Tiaropsidium atlanticum
- Tiaropsidium mediterraneum
- Tiaropsidium vilaevelebiti
- Genus Tiaropsis (1+)
- Family Eirenidae (10+ Genera, 16+ Species)
- Genus Eirene (1+)
- Genus Campanopsis (1+)
- Genus Eugymnanthea (1+)
- Genus Eutima (3+)
- Eutima gegenbauri
- Eutima gracilis
- Eutima mira
- Genus Eutonina (2+)
- Eutonina indicans
- Eutonina scintillans
- Genus Helgicirrha (2+)
- Helgicirrha cari
- Helgicirrha schulzei
- Genus Irenium (1+)
- Genus Neotima (1+)
- Genus Phialopsis (1+)
- Genus Tima (3+)
Elegant Hydromedusa
- Tima bairdii
- Tima flavilabris
- Tima lucellana
- Family Eutimidae (2+ Genera, 2+ Species)
- Genus Eutima (1+)
- Genus Octorchis (1+)
- Family Campenulariidae (12+ Genera, 44+ Species)
- Genus Obelia (8+)
- Obelia bidentata
Double-toothed Bushy Wine-glass Hydroid
- Obelia dichotoma
Two-branched Wine-glass Hydroid
- Obelia medusa
- Obelia geniculata
Zig-zag Wine-glass Hydroid
- Obelia longissima
- Obelia lucifera
- Obelia fimbriata
- Genus Clytia (11+)
- Clytia hemisphaerica
- Clytia johnstoni
- Clytia gracilis
- Clytia islandicum
- Clytia linearis
- Clytia maccradyi
- Clytia noliformis
- Clytia paulensis
- Clytia pentata
- Clytia raridentata
- Clytia serrulata
- Genus Phialidium (5+)
- Phialidium discoideum
- Phialidium folleatum
- Phialidium islandicum
- Phialidium mccradyi
- Phialidium hemisphaericum
- Genus Agastra (1+)
- Genus Campanularia (4+)
Wine-glass Hydroid
- Campanularia crenata
- Campanularia volubilis
- Campanularia verticillata
- Campanularia hincksi
- Genus Orthopyxis (4+)
- Orthopyxis asymmaterica
- Orthopyxis crenata
- Orthopyxis caliculata
- Orthopyxis everta
- Othopyxis integra
- Genus Conothyraea (1+)
- Genus Laomedea (7+)
- Laomedea angulata
- Laomedea neglecta
- Laomedea gelatinosa
- Laomedea flexuosa
- Laomedea calceolifera
- Laomedea exigua
- Laomedea pseudodichotoma
- Genus Gonothyraea (1+)
- Genus Hartlaubella (1+)
- Genus Rhizocaulus (1+)
- Rhizocaulus verticillatus
- Genus Tulpa (1+)
- Family Campanulinidae (8+ Genera, 18+ Species)
- Genus Cuspidella (6+)
- Cuspidella costata
- Cuspidella grandis
- Cuspidella humilis
- Cuspidella mertensi
- Cuspidella procumbens
- Genus Calycella (2+)
- Calycella gracilis
- Calycella syringa
- Genus Campomma (1+)
- Genus Egmundella (2+)
- Egmundella amirantensis
- Egmundella grimaldii
- Genus Lafoeina (2+)
- Lafoeina maxima
- Lafoeina tenuis
- Genus Opercularella (3+)
- Opercularella lacerata
- Opercularella panicula
- Opercularella pumila
- Genus Tetrapoma (1+)
- Genus Eutima (1+)
- Family Cladonematidae (1+ Genera, 1+ Species)
- Family Lovenellidae (3+ Genera, 8+ Species)
- Genus Lovenella (6+)
- Lovenella chiquitita
- Lovenella clausa
- Lovenella cirrata
- Lovenella gracilis
- Lovenella paniculata
- Lovenella producta
- Genus Calycella (1+)
- Genus Stegopoma (1+)
- Family Phialellidae (2+ Genera, 3+ Species)
- Genus Phialella (1+)
- Genus Opercularella (2+)
- Opercularella lacerata
- Opercularella hispida
- Family Aequoridae (1+ Genera, 7+ Species)
- Genus Aequorea (4+)
- Aequorea aequorea
Many-ribbed Hydromedusa
- Aequorea conica
- Aequorea macrodactyla
- Aequorea paracuminata
- Aequorea forskalea
- Aequorea vitrina
- Aequorea pensilis
- Family Lafoeidae (11+ Genera, 32+ Species)
- Genus Lafoea (4+)
- Lafoea grandis
- Lafoea dumosa
- Lafoea pocillum
- Lafoea fruticosa
- Genus Acryptolaria (3+)
- Acryptolaria conferta
- Acryptolaria crassicaulis
- Acryptolaria longitheca
- Genus Anthohebella (1+)
- Genus Bedotella (1+)
- Genus Cryptolaria (3+)
- Cryptolaria abyssicola
- Cryptolaria exserta
- Cryptolaria pectinata
- Genus Filellum (3+)
- Filellum disaggregatum
- Filellum serpens
- Filellum serratum
- Genus Grammaria (2+)
- Grammaria abietina
- Grammaria immersa
- Genus Hebella (2+)
- Hebella brochi
- Hebella scandens
- Genus Scandia (2+)
- Scandia gigas
- Scandia michaelsarsi
- Genus Zygophylax (9+)
- Zygophylax bathyphila
- Zygophylax biarmata
- Zygophylax brownei
- Zygophylax echinata
- Zygophylax elegantula
- Zygophylax leloupi
- Zygophylax levinseni
- Zygophylax pinnata
- Zygophylax sibogae
- Family Haleciidae (4+ Genera, 35+ Species)
- Genus Halecium (26+)
- Halecium articulosum
- Halecium banyulense
- Halecium birulai
- Halecium conicum
- Halecium corrugatum
- Halecium curvicaule
- Halecium beani
Bean's Halecium Hydroid
- Halecium delicatulum
- Halecium groenlandicum
- Halecium halecinum
Halecium Hydroid
- Halecium labrosum
- Halecium lankesteri
- Halecium liouvillei
- Halecium mediterraneum
- Halecium minimum
- Halecium minutum
- Halecium muricatum
- Halecium nanum
- Halecium ornatum
- Halecium petrosum
- Halecium profundum
- Halecium pusillum
- Halecium reflexum
- Halecium sessile
- Halecium tenellum
Flared Halecium Hydroid
- Halecium undulatum
- Halecium
- Genus Hydrodendron (2+)
- Hydrodendron gorgonoide
- Hydrodendron mirabile
- Genus Hydranthea (3+)
- Hydranthea aloysii
- Hydranthea diaphana
- Hydranthea margarica
- Genus Campalecium (3+)
- Campalecium cirratum
- Campalecium medusiferum
- Campelecium microtheca
- Family Halocordylidae (1+ Genera, 1+ Species)
- Genus Pennaria (1+)
Feathered Hydroid
- Family Moerisiidae (3+ Genera, 5+ Species)
- Genus Moerisia (3+)
- Moerisia lyonsi
- Moerisia pallazsi
- Moerisia horii
- Genus Odessia (1+)
- Genus Ostroumovia (1+)
- Family Sertulariidae (14+ Genera, 77+ Species)
- Genus Diphasia (10+)
- Diphasia alata
- Diphasia attenuata
- Diphasia delagei
- Diphasia fallax
- Diphasia margareta
- Diphasia nigra
- Diphasia pinastrum
- Diphasia pinaster
- Diphasia rosacea
- Diphasia tamarisca
- Genus Tamarisca (1+)
- Genus Thuiaria (11+)
Silvery Hydroid, White Weed, Sea Fern
- Thuiaria alternitheca
- Thuiaria articulata
- Thuiaria breitfussi
- Thuiaria carica
- Thuiaria cupressoides
- Thuiaria decemserialis
- Thuiaria hippuris
- Thuiaria lichenastrum
- Thuiaria obsoleta
- Thuiaria thuja
- Thuiaria variabilis
- Genus Dynamena (7+)
- Dynamena dalmasi
- Dynamena disticha
- Dynamena pumila
- Dynamena cornicina
- Dynamena crisiodes
- Dynamena quadridentata
- Genus Sertularella (15+)
Garland Hydroid
- Sertularella arbuscula
- Sertularella crassicaulis
- Sertularella cubica
- Sertularella cylindritheca
- Sertularella ellisii
- Sertularella fusicormis
- Sertularella gayi
- Sertularella mediterranea
- Sertularella ornata
- Sertularella picta
- Sertularella simplex
- Sertularella tenella
- Sertularella unituba
- Sertularella polyzonias
- Sertularella rugosa
- Sertularella diaphana
- Genus Salacia (2+)
- Salacia desmoides
- Salacia dubia
- Genus Selaginopsis (1+)
- Genus Symplectoscyphus (3+)
- Symplectoscyphus amphorifera
- Symplectoscyphus bathyalis
- Symplectoscyphus tricuspidatus
- Genus Abietinaria (4+)
Fern Garland Hydroid
- Abeitinaria abientina
- Abeitinaria filicula
- Abeitinaria interversa
- Abeitinaria pulchra
- Genus Hydrallmania (1+)
- Genus Thujaria (1+)
- Genus Tridentata (1+)
- Genus Amphisbetia (1+)
- Family Olindiidae (7+ Genera, 9+ Species)
- Genus Calapasoma (1+)
- Genus Gonionemus (2+)
- Gonionemus vertens
Angled Hydromedusa
- Gonionemus vindobonensis
- Genus Craspedacusta (1+)
- Genus Gossea (2+)
- Gossea faureae
- Gossea corynetes
- Genus Maeotias (1+)
- Genus Monobrachium (1+)
- Genus Olindias (1+)
- Family Plumulariidae (12+ Genera, 42+ Species)
- Genus Kirchenpaueria (3+)
- Kirchenpaueria echinulata
- Kirchenpaueria pinnata
- Kirchenpaueria triangulata
- Genus Antennella (1+)
- Genus Monotheca (3+)
- Monotheca obliqua
- Monotheca margaretta
- Monotheca pulchella
- Genus Halopteris (1+)
- Genus Plumularia (13+)
- Plumularia alleni
- Plumularia setacea
- Plumularia buski
- Plumularia halecioides
- Plumularia catharina
- Plumularia diaphana
- Plumularia canariensis
- Plumularia filicula
- Plumularia floridana
- Plumularia linkoi
- Plumularia obliqua
- Plumularia syriaca
- Genus Nematophorus (1+)
- Genus Polyplumaria (2+)
- Polyplumaria frutescens
- Polyplumaria flabellata
- Polyplumaria gracillima
- Genus Pseudoplumaria (2+)
- Pseudoplumaria marocana
- Pseudoplumaria sabinae
- Genus Nemertesia (9+)
- Nemertesia antennina
- Nemertesia belini
- Nemertesia falcicula
- Nemertesia irregularis
- Nemertesia norvegica
- Nemertesia perrieri
- Nemertesia ramosa
- Nemertesia tetrasticha
- Nemertesia ventriculiformis
- Genus Halicornaria (1+)
- Genus Thecocarpus (1+)
- Suborder Limnomedusae (3+ Families, 7+ Genera, 13+ Species)
- Family Proboseidactylidae (3+ Genera, 5+ Species)
- Genus Proboscidactyla (1+)
- Proboscidactyla flavicirrata
- Proboscidactyla ornata
- Proboscidactyla stellata
- Genus Fabienna (1+)
- Genus Pochella (1+)
- Family Solanderiidae (3+ Genera, 6+ Species)
- Genus Rhopalonema (1+)
- Genus Solanderia (3+)
- Solanderia minima
- Solanderia misakinenesis
- Solanderia secunda
- Genus Somaris (2+)
- Somaris insculpta
- Somaris punctatus
- Family Syntheciidae (1+ Genera, 2+ Species)
- Genus Synthecium (2+)
- Synthecium evansi
- Synthecium megathecum
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