Genus names whose last component is an Ancient Greek noun (or Ancient Greek adjective treated like a noun) obtain their gender from the gender of that noun [Rule 65 (1), Rule 65 (2)]. A list of genus names formed in that manner is provided below, together with the gender of the terminal Ancient Greek noun. For instance, it should be noted that nouns of Greek origin ending in -ma are neuter and declined according to the third declension while Latin nouns ending in -a are usually feminine and belong to the first declension.
Names with Ancient Greek components in other positions are not listed here. The list neither includes names whose last component is a Neolatin word that was strongly modified compared to the original Ancient Greek word from which it was derived, particularly if this modification affected the gender. (Thus bacter, which is masculine, and bacterium, which is neuter, are not listed.) The list includes names with minor modifications, which are shown in parentheses after the Ancient Greek original. See also the LPSN introductory page on forming names.
Gender: feminine
Examples: "Chalaractis" — "Dasyactis" — "Euactis" — "Heteractis" — "Hormactis" — Inactis — "Inactis" — Isactis — "Limnactis" — "Physactis"
Gender: masculine
Examples: Desulfallas
Gender: feminine
Examples: "Calialoa" — Micraloa
Gender: feminine
Examples: "Microhaloa"
Gender: masculine or feminine
Examples: Tepidamorphus
Gender: masculine or feminine
Examples: Amorphus
Gender: masculine
Examples: Amphirytos
Gender: neuter
Examples: Archangium — "Asiosporangium" — "Astrosporangium" — Dactylosporangium — Elytrosporangium — Haliangium — "Haploangium" — "Haploangium" — Hyalangium — Intrasporangium — Melittangium — "Natronosporangium" — [Podangium] — Polyangium — Sinosporangium — Sorangium — Sphaerisporangium corrig. — Virgisporangium corrig. — Vitiosangium
Gender: feminine
Examples: Limnanthe
Gender: neuter
Examples: Desmanthos
Gender: feminine
Examples: Haliarachne
Gender: neuter
Examples: Roseateles
Gender: neuter
Examples: Geitleribactron — [Myxobactron]
Gender: neuter
Examples: "Colobactrum" — Kineobactrum — Marinibactrum — Ochrobactrum
Gender: neuter
Examples: Myxobaktron
Gender: feminine
Examples: Leptobasis
Gender: feminine
Examples: Nanobdella
Gender: feminine
Examples: "Candidatus Desulfatibia" — "Candidatus Desulfobia" — "Candidatus Minimicrobia"
Gender: masculine
Examples: "Candidatus Taurinisymbion" — "Candidatus Thiosymbion"
Gender: masculine
Examples: Abyssibius — Aestuariibius — "Candidatus Bathyanammoxibius" — Branchiibius — Caenibius — Caldanaerobius — Conchiformibius corrig. — Fodinibius — Haloarchaeobius — Maribius — Methylohalobius — Natranaerobius — Natrarchaeobius — Pelagibius — Salinibius — "Solibius" — "Candidatus Subterrananammoxibius" — Thalassobius — "Candidatus Thiobius" corrig.
Gender: masculine
Examples: "Candidatus Thiobios"
Gender: masculine
Examples: "Chthonoblastus" — Mariniblastus — Rhodoblastus
Gender: masculine
Examples: Prolinoborus — Proteiniborus
Gender: masculine
Examples: Cyanobotrys — "Hyalobotrys"
Gender: feminine
Examples: Oncobyrsa
Gender: feminine
Examples: Pleomorphochaeta — Sphaerochaeta — Spirochaeta
Gender: feminine
Examples: Calochaete — Gloeochaete — Leptochaete — "Leptochaete" — Macrochaete — Microchaete — Phormidiochaete — [Spirochaete] — Thiochaete
Gender: feminine
Examples: Gloeochlamys
Gender: feminine
Examples: "Limnochlide"
Gender: feminine
Examples: Acaryochloris — Ancalochloris — Blastochloris — [Clathrochloris] — Coccochloris — Oscillochloris — Pediochloris — Prosthecochloris — Tetrachloris
Gender: neuter
Examples: Prochloron — Prochloron
Gender: masculine
Examples: Petrachloros
Gender: feminine
Examples: Dapis
Gender: neuter
Examples: "Thiodendron"
Gender: neuter
Examples: Bactoderma — Cyanoderma — [Mycoderma] — Myxoderma — Phylloderma — Rhabdoderma — "Siphoderma"
Gender: neuter
Examples: Cyanodermatium — Phaeodermatium
Gender: neuter
Examples: Coleodesmium — Trichodesmium
Gender: feminine
Examples: "Leptodesmis" — Phormidesmis
Gender: neuter
Examples: Pyrodictium
Gender: neuter
Examples: Cyanodictyon — Pelodictyon — "Schizodictyon" — Sphaerodictyon — Thiodictyon
Gender: masculine or feminine
Examples: "Candidatus Aphodenecus" — "Brotocaccenecus" — "Candidatus Caccenecus" — "Candidatus Colenecus" — "Candidatus Coprenecus" — "Candidatus Egerieenecus" — "Candidatus Enterenecus" — "Candidatus Faecenecus" — "Candidatus Fimenecus" — "Candidatus Hippenecus" — Hominisplanchenecus — "Candidatus Limenecus" — "Candidatus Merdenecus" — "Candidatus Minthenecus" — "Candidatus Nanosalenecus" — "Candidatus Onthenecus" — "Candidatus Pelethenecus" — "Candidatus Scatenecus" — "Candidatus Scybalenecus" — "Candidatus Spyradenecus" — "Candidatus Ventrenecus"
Gender: neuter
Examples: "Tropheryma" — "Tropheryma"
Gender: feminine
Examples: Methylogaea
Gender: feminine
Examples: "Candidatus Methanogaster"
Gender: masculine
Examples: "Candidatus Methanohydrogenicus"
Gender: feminine
Examples: Chalicogloea — Chlorogloea — Chondrogloea — "Dactylogloea" — Dasygloea — Dermogloea — Rhabdogloea — "Candidatus Troglogloea" — Zoogloea
Gender: feminine
Examples: "Candidatus Tabaqchalia"
Gender: feminine
Examples: "Didymohelix" — "Candidatus Nitrohelix"
Gender: neuter
Examples: Chloroherpeton
Gender: masculine
Examples: Trichormus
Gender: neuter
Examples: Cyanohydnum
Gender: feminine
Examples: Sporichthya
Gender: feminine
Examples: Eucapsis
Gender: feminine
Examples: Marmoreocelis
Gender: neuter
Examples: Thermocladium
Gender: masculine
Examples: Mastigocladus — "Mastigocladus" — Pelatocladus
Gender: masculine
Examples: Cyanocloster — Diplocloster — Enterocloster
Gender: feminine
Examples: Coenonia
Gender: masculine
Examples: [Mikrokokkus]
Gender: neuter
Examples: Hydrocoleum — Sirocoleum
Gender: feminine
Examples: Erythroconis — "Phytoconis"
Gender: feminine
Examples: Hydrocoryne
Gender: feminine
Examples: Myxacorys — "Myxocorys"
Gender: masculine
Examples: "Candidatus Thermokryptus"
Gender: masculine
Examples: Aetokthonos
Gender: masculine
Examples: Cyanokybus
Gender: masculine
Examples: "Candidatus Umbricyclops"
Gender: feminine
Examples: Cymatolege
Gender: feminine
Examples: Anacystis — Chondrocystis — Clathrocystis — Coelocystis — Cyanocystis — Diplocystis — Geminocystis — "Candidatus Ichthyocystis" — Isocystis — Lamprocystis — Methylocystis — Microcystis — Minicystis — Nannocystis — [Nitrosocystis] — Phaselicystis — Plesiocystis — Polycystis — Racemicystis — Radiocystis — [Rhodocystis] — "Sulfuricystis" — Synechocystis — Thaumaleocystis — Thiocystis — Trichocystis
Gender: neuter
Examples: Chroakolemma
Gender: neuter
Examples: "Candidatus Methanoliparum"
Gender: masculine
Examples: Segniliparus
Gender: masculine or feminine
Examples: Epilithia
Gender: feminine
Examples: Pilimelia
Gender: feminine
Examples: Katagnymene
Gender: masculine
Examples: Meniscus
Gender: neuter
Examples: Aphanizomenon
Gender: masculine
Examples: Stenomitos
Gender: neuter
Examples: Coelomoron
Gender: feminine
Examples: Calycomorphotria
Gender: masculine
Examples: Actinomyces — Agromyces — "Anulomyces" — "Borrelomyces" — Chondromyces — [Discomyces] — Glycomyces — [Malleomyces] — Mechercharimyces — Melghirimyces — [Micromyces] — [Murimyces] — [Musculomyces] — Mzabimyces — "Odontomyces" — Planctomyces — Polycladomyces — "Sapromyces" — Streptomyces — Tenggerimyces — Thermasporomyces — Thermoactinomyces
Gender: feminine
Examples: Enhygromyxa — Lithomyxa — "Paraliomyxa" — [Phytomyxa]
Gender: feminine
Examples: Spelaeonaias
Gender: masculine
Examples: "Candidatus Cacconaster" — "Candidatus Colinaster" — "Candidatus Copronaster" — "Candidatus Equinaster" — "Candidatus Faecinaster" — "Candidatus Fiminaster" — "Candidatus Liminaster" — "Candidatus Merdinaster" — "Candidatus Onthonaster" — "Candidatus Scatonaster"
Gender: neuter
Examples: Acetonema — Achroonema — Actinosynnema — Aerosakkonema — Alkalinema — Almyronema — Amazoninema — Anagnostidinema — Apatinema — Argonema — "Arhinema" — Arizonema — Arthronema — "Arthronema" — Baaleninema — Bacterionema — Boanema — Brachynema — Brasilonema — Brevinema — Calenema — Camptylonema — Campylonema corrig. — "Chamaenema" — Chloronema — Chondrinema — Coleonema — Colteronema — "Deinonema" — Desmonema — Desulfonema — Diplonema — Egbenema — "Candidatus Electronema" — Eleutheronema — Endonema — "Eoleptonema" — Eoplectonema — Euryhalinema — Gansulinema — Geitlerinema — "Gloionema" — Gracilinema — Halomicronema — Herpyzonema — Hormathonema — Iningainema — Jaaginema — Johanseninema — Kamptonema — Klisinema — Koinonema — Konicacronema — Lagosinema — Laspinema — Leptonema — Letestuinema — Leuconema — Limnonema — Lithonema — "Longinema" — Marininema — "Mastichonema" — "Mastigonema" — Meganema — Monilinema — [Myrionema] — Natrinema — Neomegalonema — Olisthonema — Onkonema — Oxynema — Palaeoscytonema — Pantanalinema — Pelonema — Persinema — Petalonema — Phyllonema — "Plaxonema" — Plectonema — "Candidatus Pleuronema" corrig. — Pycnacronema — "Qingjiangonema" — Radiculonema — Rectinema — Rhicnonema — Rhizonema — Sacconema — Salininema — [Schmidleinema] — Scopulonema — Scytonema — Shahulinema — Siphononema — Skujaephyconema — Sodalinema — "Candidatus Sphaeronema" — "Candidatus Spironema" — Stauromatonema — Stigonema — Symphyonema — "Tapinonema" — Teretinema — "Termitinema" — Thainema — Thermonema — "Thionema" — "Toxinema" — Treponema — Tryponema — Tychonema
Gender: masculine
Examples: Cyanonephron
Gender: masculine
Examples: "Candidatus Nitronereus"
Gender: feminine
Examples: Allocoleopsis — "Allocoleopsis" — Amycolatopsis — Anabaenopsis — Aphanocapsaopsis — Brachytrichiopsis — Camptylonemopsis — Chamaesiphonopsis — Chlorogloeaopsis — Chlorogloeopsis — Chroococcidiopsis — Chroococcopsis — Coelosphaeriopsis — Coleodesmiopsis corrig. — Coleodesmiumopsis — "Coleospermopsis" — Cylindrospermopsis — Dactylococcopsis — Echeverriopsis — Eomycetopsis — Fischerellopsis — Gloeocapsopsis — Hapalopsis — Kirchneriellopsis — Komarkovaeasiopsis — "Loriellopsis" — Lyngbyopsis — Mastigocladopsis — Mastigocoleopsis — Microcoleusiopsis — Mycoplasmopsis — Nocardiopsis — Nostochopsis — Nostocopsis — Nostocopsis — Ortonellopsis — Oscillatoriopsis — Raphidiopsis — Rivulariopsis — Romeriopsis — Scytonematopsis — Sphaerospermopsis — Spirillopsis — Spirulinopsis — Symphyonemopsis — "Tolypothrichopsis" — "Toxopsis" — Westiellopsis
Gender: feminine
Examples: "Candidatus Aphodousia" — "Candidatus Apopatousia" — "Candidatus Caccousia" — "Candidatus Choladousia" — "Candidatus Colousia" — "Candidatus Coprousia" — "Candidatus Egerieousia" — "Candidatus Enterousia" — "Candidatus Faecousia" — "Candidatus Fimousia" — Kryptousia — "Candidatus Limousia" — "Candidatus Merdousia" — "Candidatus Methanospyradousia" — "Candidatus Minthousia" — "Candidatus Onthousia" — "Candidatus Pelethousia" — "Candidatus Physcousia" — "Candidatus Scatousia" — "Candidatus Scybalousia" — "Candidatus Stercorousia" — "Candidatus Ventrousia"
Gender: neuter
Examples: Holopedium
Gender: neuter
Examples: "Candidatus Micropelagos"
Gender: feminine
Examples: Skujapelta
Gender: feminine
Examples: Micropepsis
Gender: neuter
Examples: Caryophanon — Cyanophanon
Gender: masculine
Examples: Ferriphaselus
Gender: masculine
Examples: Arsenophonus
Gender: neuter
Examples: "Alyssophoron" — Komvophoron
Gender: neuter
Examples: "Sarcinophycus"
Gender: feminine
Examples: Entophysalis
Gender: feminine
Examples: "Candidatus Thiophysa"
Gender: neuter
Examples: Cephalophytarion
Gender: neuter
Examples: Epiphyton
Gender: masculine
Examples: Actinoplanes — Bacterioplanes — Catenuloplanes — Couchioplanes — Desulfoplanes — Rhodoplanes — Spirilliplanes
Gender: masculine
Examples: Haliplanktos
Gender: neuter
Examples: Acholeplasma — Acidiplasma — Anaeroplasma — Anaplasma — "Candidatus Aphodoplasma" — Asteroleplasma — "Candidatus Bacilliplasma" corrig. — "Candidatus Bacilloplasma" — "Candidatus Bathoplasma" corrig. — "Candidatus Bathyoplasma" — "Candidatus Caccoplasma" — "Candidatus Carboxiplasma" — "Candidatus Coliplasma" — "Candidatus Coproplasma" — "Candidatus Cryptoplasma" — Cuniculiplasma — "Edwardiiplasma" — Entomoplasma — "Candidatus Faeciplasma" — Ferroplasma — "Candidatus Fimiplasma" — "Candidatus Gimiplasma" — "Candidatus Haladaptoplasma" — Haloplasma — "Candidatus Haloplasma" — Haploplasma — "Candidatus Hepatoplasma" — "Candidatus Hepatoplasma" — "Hujiaoplasma" — "Candidatus Izemoplasma" corrig. — "Candidatus Izimaplasma" — "Candidatus Limiplasma" — "Candidatus Lunaplasma" — Malacoplasma — Mariniplasma — "Candidatus Mariniplasma" corrig. — "Candidatus Medusoplasma" — "Candidatus Merdiplasma" — Mesoplasma — "Candidatus Methanoplasma" — "Candidatus Moeniiplasma" — Mycoplasma — "Candidatus Natronoplasma" — "Candidatus Onthoplasma" — "Candidatus Phytoplasma" — "Pluraplasma" — "Candidatus Saliniplasma" — "Candidatus Scatoplasma" — "Candidatus Scheffleriplasma" — "Schizoplasma" — Spiroplasma — Thermoplasma — "Tullyiplasma" — "Candidatus Tyloplasma" — Ureaplasma — "Candidatus Vermiplasma" — Williamsoniiplasma — "Candidatus Xianfuyuplasma"
Gender: feminine
Examples: "Candidatus Chloroploca" — Peloploca — Rhodoploca — Symploca — Thioploca
Gender: masculine
Examples: Leptopogon — Spelaeopogon
Gender: feminine
Examples: Homoeoptyche
Gender: feminine
Examples: Kallipyga
Gender: neuter
Examples: Aeropyrum
Gender: feminine
Examples: Sphingopyxis
Gender: neuter
Examples: Desulfatirhabdium
Gender: feminine
Examples: Aestuariirhabdus — Anaerorhabdus — Antarcticirhabdus — Aquirhabdus — Brevirhabdus — Desulforhabdus — Edaphorhabdus — Enterorhabdus — Flavirhabdus — Halorhabdus — Intestinirhabdus — Longirhabdus — Luteirhabdus — Marinirhabdus — Methylorhabdus — Oceanirhabdus — Paludirhabdus — Pelagirhabdus — Pelorhabdus — Persicirhabdus — Photorhabdus — Pontirhabdus — Profundirhabdus — Rhizorhabdus — Salirhabdus — Sandarakinorhabdus — Sphingorhabdus — Sulfurirhabdus — Syntrophorhabdus — Tellurirhabdus — Thalassorhabdus — "Thalassorhabdus" — Thiomicrorhabdus — Xenorhabdus
Gender: feminine
Examples: Limnoraphis
Gender: feminine
Examples: Rhizorhapis
Gender: feminine
Examples: Microseira
Gender: feminine
Examples: Aulosira — Capsosira — "Chamaesiphonosira" — "Spermosira"
Gender: masculine
Examples: "Candidatus Anthektikosiphon" — "Arthrosiphon" — Bacillosiphon — Chamaesiphon — Cirrosiphon — Desmosiphon — "Drilosiphon" — Gomphosiphon — Hapalosiphon — Herpetosiphon — "Hormosiphon" — Porphyrosiphon — Potamosiphon — "Schizosiphon" — Sirosiphon — "Sirosiphon" — Sphaenosiphon — Sphinctosiphon — Stichosiphon — "Symphyosiphon" — "Thiosiphon"
Gender: neuter
Examples: Thermanaerosceptrum corrig. — Thermoanaerosceptrum
Gender: feminine
Examples: [Trochiscia]
Gender: neuter
Examples: Acidisoma — Anaerosoma — "Candidatus Aphodosoma" — "Candidatus Apopatosoma" — "Candidatus Caccosoma" — "Candidatus Colisoma" — "Candidatus Coprosoma" — [Dechlorisoma] — Dechlorosoma — Deferrisoma — Denitratisoma — Desulfosoma — "Candidatus Egerieisoma" — "Candidatus Enterosoma" — "Candidatus Epixenosoma" — "Candidatus Faecisoma" — Fibrisoma — "Candidatus Fimisoma" — "Candidatus Limisoma" — "Candidatus Merdisoma" — Methylosoma — "Candidatus Minthosoma" — "Candidatus Onthosoma" — "Candidatus Pelethosoma" — "Candidatus Physcosoma" — "Candidatus Scatosoma" — "Candidatus Scybalosoma" — Spirosoma — "Candidatus Spyradosoma" — Sulfurisoma — "Candidatus Ventrisoma"
Gender: feminine
Examples: Aestuariispira — Arthrospira — Aureispira — Azospira — Brachyspira — Cristispira — "Cyanospira" — Desulfonatronospira — Desulfospira — Desulfurispira — Dissulfurispira — "Drepanospira" — Ectothiorhodospira — Entomospira — Exilispira — "Flexispira" — Fluviispira — "Candidatus Gallispira" — Glaucospira — "Candidatus Haliotispira" — "Halochlorospira" — Juguspira — Lachnospira — Leptospira — Limnospira — Magnetospira — "Candidatus Magnispira" corrig. — "Candidatus Magnospira" — "Candidatus Methylospira" — Natronospira — Nitrosospira — Nitrospira — Oleispira — Oscillospira — "Pacificispira" — Propionispira — Rhodospira — Roseospira — Salinispira — Saprospira — Simplicispira — Spongiispira — Succinispira — Terasakiispira — Thalassospira — Thermospira — Thioalkalispira — Thiospira — Trichospira
Gender: neuter
Examples: "Cyclosperma"
Gender: neuter
Examples: Coleospermum — "Coleospermum" — Cylindrospermum — Dolichospermum — "Dolichospermum" — Macrospermum — Sphaerospermum
Gender: feminine
Examples: Acidisphaera — "Aerosphaera" — Algisphaera — "Candidatus Alisphaera" — "Candidatus Alysiosphaera" — "Candidatus Alysiosphaera" — Anaerohalosphaera — Apollinarisphaera — Aquisphaera — Aureisphaera — "Candidatus Bathosphaera" — Caldisphaera — Catenisphaera — Conexivisphaera — Crocosphaera — "Diplosphaera" — Epigloeosphaera — Fontisphaera — Geminisphaera — "Candidatus Halyseosphaera" corrig. — "Candidatus Halysiosphaera" corrig. — "Humisphaera" — Ignisphaera — Isosphaera — Kineosphaera — Lactosphaera — "Lacunisphaera" — Lentisphaera — Limisphaera — "Candidatus Limnosphaera" — Megasphaera — Melasmatosphaera — Metallosphaera — Methanosphaera — Methylosphaera — Microsphaera — Mirosphaera — Mucisphaera — Nitrososphaera — "Candidatus Nitrososphaera" — Oceanisphaera — Oligosphaera — Paludisphaera — [Pedosphaera] — Phycisphaera — Poriferisphaera — Psychrosphaera — Quadrisphaera — Rubinisphaera — Salinisphaera — Scissilisphaera — Sedimentisphaera — Singulisphaera — Siphonosphaera — Sulfurisphaera — "Candidatus Syntrophosphaera" — Tepidisphaera — Tetrasphaera — Thermosphaera — Thiosphaera — Tundrisphaera — Zestosphaera
Gender: feminine
Examples: Acrocarpospora — Actinaurispora — Actinobispora — Actinocatenispora — Actinokineospora — "Actinomonospora" — Actinomycetospora — Actinopolyspora — Actinorectispora — Actinorhabdospora — Actinorugispora — Anaerospora — Asaccharospora — "Brachystreptospora" — Carbonactinospora — Catelliglobosispora — Catenulispora — Desertactinospora corrig. — Desertiactinospora — Desmospora — Desulfitispora — Desulfonispora — Desulfurispora — Endospora — Excellospora — Faecalispora — Haloactinospora — Halopolyspora — Herbidospora — Holospora — Holospora — Hydrogenispora — Kitasatospora corrig. — Ktedonospora — Lacrimispora — Longispora — Lutispora — [Macrospora] — Mangrovactinospora — Marinactinospora — "Marinispora" — Marinitenerispora — Microbispora — "Microechinospora" — Micromonospora — Micropolyspora — "Microstreptospora" — Microtetraspora — "Nonospora" — "Oospora" — "Parvopolyspora" — Pelospora — Phosphitispora — Phytomonospora — Planobispora — Planomonospora — Planopolyspora — Planotetraspora — Plantactinospora — Polycladospora — Polymorphospora — Propionispora — Rugosimonospora — Saccharomonospora — Saccharopolyspora — Salinactinospora — Salinispora — "Solwaraspora" — Sorospora — Sphaerimonospora — Spinactinospora — Spiractinospora — Spirillospora — Spongiactinospora — Staphylospora — Streptimonospora — Streptomonospora corrig. — Syntrophospora — Thermoactinospora — Thermobispora — Thermocatellispora — Thermogemmatispora — Thermomonospora — Thermopolyspora — Verrucosispora
Gender: feminine
Examples: Pelistega
Gender: masculine
Examples: Dapisostemon — Streptostemon
Gender: masculine
Examples: Rhodostichus — Thermostichus — "Thermostichus"
Gender: masculine
Examples: Cyanostylon
Gender: masculine
Examples: Symbiotes
Gender: masculine
Examples: "Candidatus Haloectosymbiotes"
Gender: masculine or feminine
Examples: "Spirosymplokos"
Gender: feminine
Examples: "Calotaxis"
Gender: feminine
Examples: Cyanotetras
Gender: neuter
Examples: Thalassoporum
Gender: neuter
Examples: Hormothamnion
Gender: masculine or feminine
Examples: Cyanothamnos — Dactylothamnos
Gender: neuter
Examples: "Candidatus Gigantothauma" corrig.
Gender: feminine
Examples: Anathece — Aphanothece — Cyanothece — Gloeothece — Halothece — Hormothece — "Rhodothece" — "Symphothece" — "Thiothece"
Gender: feminine
Examples: Leptothoe
Gender: masculine or feminine
Examples: Xenotholos
Gender: feminine
Examples: Acidithrix — Amphithrix — Anabaenothrix — Ancylothrix — Atlanticothrix — Blennothrix — Brachythrix — Brochothrix — Caldithrix — Calorithrix — Calothrix — Calyptothrix — Camptothrix — Cephalothrix — Chamaethrix — "Cladothrix" — "Clonothrix" — "Candidatus Combothrix" — "Conidiothrix" — Crenothrix — Cuspidothrix — Cyanothrix — Cyanothrix — Dichothrix — "Dictyothrix" — "Candidatus Electrothrix" — "Entothrix" — Erysipelothrix — Ferrithrix — Flexithrix — Geothrix — "Glaucothrix" — Gliothrix — Haloechinothrix — Halythrix — Heliothrix — [Homeothrix] — Homoeothrix — Hypheothrix — "Hypheothrix" — Kineothrix — [Kouleothrix] — Kyrtuthrix — Labilithrix — Leptochromothrix — Leptothrix — Leucothrix — Limnothrix — "Candidatus Marithrix" — Methanothrix — "Candidatus Microthrix" — "Candidatus Nephrothrix" — Ophiothrix — Pegethrix — Pelagothrix — Planktothrix — Polythrix — Prochlorothrix — Proterendothrix — Rapidithrix — Saccharothrix — Salinithrix — "Candidatus Sarcinithrix" — Schizothrix — "Sphaerothrix" — [Streptothrix] — "Candidatus Symbiothrix" — "Symphyothrix" — Tapinothrix — "Thermanaerothrix" — Thermosporothrix — Thermothrix — "Thioflexothrix" — Thiothrix — Tolypothrix — Toxothrix — Tumidithrix — "Candidatus Vecturithrix"
Gender: feminine
Examples: Brachytrichia — "Diplotrichia" — Gloeotrichia — Leptotrichia — "Zonotrichia"
Gender: feminine
Examples: "Archaeotrichion"
Gender: feminine
Examples: Azomonotrichon
Gender: masculine
Examples: "Arthrotilum"
Gender: masculine
Examples: Halorutilus — Sphaerotilus
Gender: masculine
Examples: Actinoalloteichus — Streptoalloteichus
Gender: masculine
Examples: "Stenotopis"
Gender: feminine
Examples: Abiotrophia
Gender: masculine or feminine
Examples: Rhodoligotrophos
Gender: masculine or feminine
Examples: Oligotropha — Thermosyntropha — "Candidatus Thiodiazotropha"
Gender: masculine or feminine
Examples: "Candidatus Manganitrophus" — "Candidatus Methanomixotrophus" corrig. — "Candidatus Omnitrophus"
Gender: masculine
Examples: Campylotropium
Gender: masculine
Examples: "Candidatus Polytropus"
Gender: neuter
Examples: Eperythrozoon