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: "Ainactis" — "Chalaractis" — "Dasyactis" — "Euactis" — "Heteractis" — "Hormactis" — Inactis — "Inactis" — Isactis — "Limnactis" — "Physactis"
Gender: masculine
Examples: Desulfallas
Gender: masculine or feminine
Examples: Amorphus
Gender: neuter
Examples: Actinosporangium — Amorphosporangium — Archangium — "Asiosporangium" — "Astrosporangium" — Cryptosporangium — Dactylosporangium — Elytrosporangium — Haliangium — "Haploangium" — "Haploangium" — Hyalangium — Intrasporangium — Kibdelosporangium — Melittangium — "Natronosporangium" — Planosporangium — [Podangium] — Polyangium — Pseudosporangium — Sinosporangium — Sorangium — Sphaerisporangium corrig. — Streptosporangium — Virgisporangium corrig. — Vitiosangium
Gender: feminine
Examples: Limnanthe
Gender: neuter
Examples: Desmanthos
Gender: feminine
Examples: Haliarachne
Gender: neuter
Examples: Roseateles
Gender: neuter
Examples: Geitleribactron
Gender: neuter
Examples: "Colobactrum" — Kineobactrum — Marinibactrum — Ochrobactrum
Gender: neuter
Examples: Myxobaktron
Gender: feminine
Examples: Leptobasis
Gender: feminine
Examples: Nanobdella
Gender: feminine
Examples: "Desulfatibia" — "Desulfobia" — [Minimicrobia]
Gender: masculine
Examples: "Candidatus Thiosymbion"
Gender: masculine
Examples: Aestuariibius — Branchiibius — Caenibius — Caldanaerobius — Conchiformibius corrig. — Fodinibius — Haloarchaeobius — Maribius — Methylohalobius — Natranaerobius — Natrarchaeobius — Natronolimnobius — Pelagibius — Salinibius — "Solibius" — Thalassobius — "Candidatus Thiobius" corrig.
Gender: masculine
Examples: "Candidatus Thiobios"
Gender: masculine
Examples: "Chthonoblastus" — Mariniblastus — Rhodoblastus
Gender: masculine
Examples: Prolinoborus — Proteiniborus
Gender: masculine
Examples: Cyanobotrys
Gender: feminine
Examples: Oncobyrsa
Gender: feminine
Examples: Pleomorphochaeta — Sphaerochaeta — Spirochaeta — Thiospirochaeta
Gender: feminine
Examples: Calochaete — Gloeochaete — Leptochaete — "Leptochaete" — Macrochaete — Microchaete — Phormidiochaete — [Spirochaete] — Thiochaete
Gender: feminine
Examples: Gloeochlamys
Gender: feminine
Examples: Acaryochloris — Ancalochloris — Blastochloris — [Clathrochloris] — Coccochloris — Oscillochloris — Pediochloris — Prosthecochloris — "Pseudoacaryochloris" — [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: neuter
Examples: "Tropheryma" — "Tropheryma"
Gender: feminine
Examples: Methylogaea
Gender: masculine
Examples: "Candidatus Methanohydrogenicus"
Gender: feminine
Examples: Chalicogloea — Chlorogloea — Chondrogloea — "Dactylogloea" — Dasygloea — Dermogloea — "Palmogloea" — Rhabdogloea — "Candidatus Troglogloea" — Zoogloea
Gender: feminine
Examples: "Didymohelix" — [Nitrohelix]
Gender: neuter
Examples: Chloroherpeton
Gender: masculine
Examples: Trichormus
Gender: neuter
Examples: Cyanohydnum
Gender: feminine
Examples: Sporichthya
Gender: feminine
Examples: [Pedodermatophilus]
Gender: feminine
Examples: Eucapsis
Gender: neuter
Examples: Thermocladium
Gender: masculine
Examples: 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 Nitrosocosmicus" — "Candidatus Nitrosocosmicus"
Gender: masculine
Examples: Aetokthonos
Gender: masculine
Examples: Cyanokybus
Gender: masculine
Examples: "Candidatus Umbricyclops"
Gender: feminine
Examples: Cymatolege
Gender: feminine
Examples: Anacystis — Chondrocystis — "Chroogloeocystis" — Clathrocystis — Coelocystis — Cyanocystis — Diplocystis — Geminocystis — "Candidatus Ichthyocystis" — Isocystis — Lamprocystis — Methylocystis — Microcystis — Microcystis — Minicystis — Nannocystis — [Nitrosocystis] — Phaselicystis — Plesiocystis — Polycystis — Racemicystis — Radiocystis — [Rhodocystis] — "Sulfuricystis" — Synechocystis — Thaumaleocystis — Thiocystis — Trichocystis
Gender: neuter
Examples: Amphiheterocytum
Gender: feminine
Examples: Labrys
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 — Haloactinomyces — [Malleomyces] — Mechercharimyces — Melghirimyces — [Micromyces] — [Murimyces] — [Musculomyces] — Mzabimyces — "Odontomyces" — "Parastreptomyces" — Planctomyces — Polycladomyces — "Proactinomyces" — "Sapromyces" — Streptomyces — Tenggerimyces — Thermasporomyces — Thermoactinomyces
Gender: feminine
Examples: Enhygromyxa — Lithomyxa — "Paraliomyxa" — [Phytomyxa]
Gender: feminine
Examples: Spelaeonaias
Gender: neuter
Examples: Acetonema — Achroonema — Actinosynnema — Aerosakkonema — Alkalinema — "Candidatus Allospironema" corrig. — Amazoninema — Anagnostidinema — Argonema — "Arhinema" — Arizonema — Arthronema — "Arthronema" — Baaleninema — Bacterionema — Boanema — Brachynema — Brasilonema — Brevinema — Calenema — Callonema — Camptylonema — Campylonema corrig. — "Chamaenema" — Chloronema — Coleonema — Colteronema — "Deinonema" — Desmonema — Desulfonema — Diplonema — "Candidatus Electronema" — Eleutheronema — Endonema — "Eoleptonema" — Euryhalinema — Geitlerinema — "Gloionema" — Gracilinema — Halomicronema — Herpyzonema — Hormathonema — Iningainema — Jaaginema — Johanseninema — Kamptonema — Klisinema — Koinonema — Lagosinema — Laspinema — Leptonema — Letestuinema — Leuconema — Lithonema — "Longinema" — Marininema — "Mastichonema" — "Mastigonema" — Meganema — Monilinema — Natrinema — Neomegalonema — Onkonema — Oxynema — Pantanalinema — Paraplectonema — Pelonema — Persinema — Petalonema — "Phragmonema" — Phyllonema — "Plaxonema" — Plectonema — "Candidatus Pleuronema" corrig. — "Pseudogeitlerinema" — Pseudoscytonema — Pycnacronema — Rectinema — Rhizonema — Sacconema — Salininema — Scopulonema — Scytonema — Siphononema — Skujaephyconema — Sodalinema — "Candidatus Sphaeronema" — "Candidatus Spironema" — Stauromatonema — Stigonema — Symphyonema — "Tapinonema" — "Teretinema" — "Termitinema" — Thermonema — "Thionema" — "Toxinema" — Treponema — Tryponema — Tychonema
Gender: masculine
Examples: Cyanonephron
Gender: feminine
Examples: Allocoleopsis — "Allocoleopsis" — Amycolatopsis — Anabaenopsis — Brachytrichiopsis — Camptylonemopsis — Chamaesiphonopsis — Chlorogloeopsis — Chroococcidiopsis — Chroococcopsis — Coelosphaeriopsis — Coleodesmiopsis — "Coleospermopsis" — Cylindrospermopsis — [Dactylococcopsis] — Echeverriopsis — "Candidatus Endobryopsis" — Fischerellopsis — Gloeocapsopsis — Hapalopsis — Kirchneriellopsis — "Loriellopsis" — Lyngbyopsis — Mastigocladopsis — Mastigocoleopsis — Microcoleusiopsis — Mycoplasmopsis — Nocardiopsis — Nostochopsis — Oscillatoriopsis — Raphidiopsis — Rivulariopsis — Scytonematopsis — Sphaerospermopsis — Spirillopsis — Spirulinopsis — Symphyonemopsis — "Thiospirillopsis" — "Tolypothrichopsis" — "Toxopsis" — Westiellopsis
Gender: feminine
Examples: Kryptousia
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: "Candidatus Methanomixophus"
Gender: neuter
Examples: Caudiculophycus — Ophiophycus — Siphonophycus — Sphaerophycus
Gender: feminine
Examples: Entophysalis
Gender: feminine
Examples: "Candidatus Thiophysa"
Gender: masculine
Examples: Actinoplanes — Bacterioplanes — Catenuloplanes — Couchioplanes — Desulfoplanes — Rhodoplanes — Spirilliplanes
Gender: neuter
Examples: Acholeplasma — Acidiplasma — "Candidatus Allocryptoplasma" corrig. — Anaeroplasma — Anaplasma — Asteroleplasma — "Candidatus Bacilliplasma" corrig. — "Candidatus Bacilloplasma" — "Candidatus Bathoplasma" corrig. — "Candidatus Bathyoplasma" — "Candidatus Cryptoplasma" — Cuniculiplasma — "Edwardiiplasma" — Entomoplasma — Ferroplasma — Haloplasma — Haploplasma — "Candidatus Hepatoplasma" — "Candidatus Izemoplasma" corrig. — "Candidatus Izimaplasma" — "Candidatus Lunaplasma" — Malacoplasma — Mariniplasma — "Candidatus Mariniplasma" corrig. — "Candidatus Medusoplasma" — Mesoplasma — "Candidatus Methanoplasma" — "Candidatus Moeniiplasma" — Mycoplasma — "Paranaplasma" — "Candidatus Phytoplasma" — "Pluraplasma" — "Candidatus Scheffleriplasma" — "Schizoplasma" — Spiroplasma — Thermoplasma — "Tullyiplasma" — Ureaplasma — "Candidatus Vermiplasma" — Williamsoniiplasma — "Candidatus Xianfuyuplasma"
Gender: feminine
Examples: "Candidatus Chloroploca" — Peloploca — Rhodoploca — Symploca — Thioploca
Gender: masculine
Examples: Leptopogon — Pseudospelaeopogon — Spelaeopogon
Gender: feminine
Examples: "Thiopontia"
Gender: feminine
Examples: Cyanoptyche — Homoeoptyche
Gender: feminine
Examples: Kallipyga
Gender: neuter
Examples: Aeropyrum
Gender: feminine
Examples: Sphingopyxis
Gender: neuter
Examples: Desulfatirhabdium
Gender: feminine
Examples: Aestuariirhabdus — Anaerorhabdus — Aquirhabdus — Brevirhabdus — Desulforhabdus — Dissulfurirhabdus — Edaphorhabdus — Enterorhabdus — Flavirhabdus — Halorhabdus — Intestinirhabdus — Longirhabdus — Luteirhabdus — Marinirhabdus — Methylorhabdus — Oceanirhabdus — Paludirhabdus — Pelagirhabdus — Pelorhabdus — Persicirhabdus — Photorhabdus — Pontirhabdus — Rhizorhabdus — Salirhabdus — Sandarakinorhabdus — Sphingorhabdus — Sulfurirhabdus — Syntrophorhabdus — Tellurirhabdus — Thalassorhabdus — "Thalassorhabdus" — Thermodesulforhabdus — Thiohalorhabdus — Thiomicrorhabdus — Xenorhabdus
Gender: feminine
Examples: Limnoraphis
Gender: feminine
Examples: Rhizorhapis
Gender: masculine
Examples: Amphirytos
Gender: feminine
Examples: Microseira
Gender: feminine
Examples: Aulosira — Capsosira — "Chamaesiphonosira" — "Spermosira"
Gender: masculine
Examples: "Candidatus Anthektikosiphon" — "Arthrosiphon" — Bacillosiphon — Chamaesiphon — Cirrosiphon — Desmosiphon — "Drilosiphon" — 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 — [Dechlorisoma] — Dechlorosoma — Deferrisoma — Denitratisoma — Desulfosoma — "Candidatus Epixenosoma" — Fibrisoma — Methylosoma — Spirosoma — Sulfurisoma
Gender: feminine
Examples: Aestuariispira — Arthrospira — Aureispira — Azospira — Brachyspira — Cristispira — "Cyanospira" — Desulfonatronospira — Desulfospira — Desulfurispira — Dissulfurispira — "Drepanospira" — Ectothiorhodospira — "Entomospira" — Exilispira — "Flexispira" — Fluviispira — Glaucospira — "Halochlorospira" — Halorhodospira — Juguspira — Lachnospira — Leptospira — Limnospira — Magnetospira — "Candidatus Magnispira" corrig. — "Candidatus Magnospira" — "Candidatus Maribrachyspira" — "Candidatus Methylospira" — Natronospira — Nitrosospira — Nitrospira — Oleispira — Oscillospira — "Pacificispira" — Propionispira — Rhodospira — Roseospira — Salinispira — Saprospira — Simplicispira — Spongiispira — Succinispira — Terasakiispira — Thalassospira — Thioalkalispira — Thiohalospira — Thiomicrospira — Thiorhodospira — Thiospira — Trichospira
Gender: neuter
Examples: "Cyclosperma"
Gender: neuter
Examples: Coleospermum — "Coleospermum" — Cylindrospermum — Dolichospermum — "Dolichospermum" — Macrospermum — Sphaerospermum
Gender: feminine
Examples: Acidisphaera — "Aerosphaera" — Algisphaera — [Alisphaera] — "Candidatus Alysiosphaera" — Anaerohalosphaera — Anaerosphaera — Aquisphaera — Aureisphaera — "Candidatus Bathosphaera" — Caldisphaera — Catenisphaera — Conexivisphaera — Crocosphaera — "Diplosphaera" — Embryosphaera — Epigloeosphaera — Geminisphaera — [Halyseosphaera] — "Candidatus Halysiosphaera" corrig. — "Humisphaera" — Ignisphaera — Isosphaera — Kineosphaera — Lactosphaera — "Lacunisphaera" — Lentisphaera — Limisphaera — "Candidatus Limnosphaera" — Megasphaera — Metallosphaera — Methanosphaera — Methylosphaera — Microsphaera — Mucisphaera — 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: Gomphosphaeria
Gender: feminine
Examples: Acrocarpospora — Actinaurispora — Actinobispora — Actinocatenispora — Actinokineospora — "Actinomonospora" — Actinomycetospora — Actinopolyspora — Actinorectispora — Actinorhabdospora — Actinorugispora — Anaerospora — Asaccharospora — Carbonactinospora — Catellatospora — Catelliglobosispora — Catenulispora — Desertactinospora corrig. — Desertiactinospora — Desmospora — Desulfitispora — Desulfonispora — Desulfurispora — Endospora — Excellospora — Haloactinopolyspora — Haloactinospora — Halopolyspora — Herbidospora — Holospora — Holospora — Hydrogenispora — Kitasatospora corrig. — Ktedonospora — Lacrimispora — Longispora — Lutispora — [Macrospora] — Marinactinospora — "Marinispora" — Marinitenerispora — Microbispora — "Microechinospora" — Micromonospora — Micropolyspora — "Microstreptospora" — Microtetraspora — "Nonospora" — "Oospora" — "Parvopolyspora" — Pelospora — Phosphitispora — Phytoactinopolyspora — Phytomonospora — Planobispora — Planomonospora — Planopolyspora — Planotetraspora — Plantactinospora — 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 — Thermostaphylospora — Verrucosispora
Gender: feminine
Examples: Kineosporia — Kitasatosporia — Microellobosporia
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: Hormothamnion
Gender: masculine or feminine
Examples: Cyanothamnos — Dactylothamnos
Gender: neuter
Examples: "Candidatus Gigantothauma" corrig.
Gender: feminine
Examples: Anathece — Aphanothece — Chroothece — Cyanothece — Gloeothece — Halothece — Hormothece — "Rhodothece" — "Symphothece" — "Thiothece"
Gender: neuter
Examples: "Candidatus Acetithermum"
Gender: masculine
Examples: Acetothermus — "Candidatus Acetothermus" — Acidothermus — Carboxydothermus — Desulfothermus — "Candidatus Homeothermus" — Hydrogenothermus — "Candidatus Hydrothermus" — Hyperthermus — Marinithermus — Meiothermus — Methanothermus — [Methylacidithermus] — Methylothermus — "Methylothermus" — Oceanithermus — Rhabdothermus — Rhodothermus — Roseithermus — Staphylothermus — Syntrophothermus — Thermus — Vulcanithermus
Gender: feminine
Examples: Leptothoe
Gender: masculine or feminine
Examples: Xenotholos
Gender: feminine
Examples: "Acidithrix" — Amphithrix — Anabaenothrix — Ancylothrix — "Asterothrix" — Atlanticothrix — Blennothrix — Brachythrix — Brochothrix — Caldithrix — Calorithrix — Calothrix — Camptothrix — Cephalothrix — Chamaethrix — "Cladothrix" — "Clonothrix" — "Candidatus Combothrix" — "Conidiothrix" — Crenothrix — Cuspidothrix — Cyanothrix — Cyanothrix — Dichothrix — "Dictyothrix" — "Candidatus Electrothrix" — "Entothrix" — Erysipelothrix — Ferrithrix — Flexithrix — Geothrix — "Glaucothrix" — Gliothrix — Haloechinothrix — Halothermothrix — Heliothrix — Homoeothrix — Hypheothrix — "Hypheothrix" — Kineothrix — "Kouleothrix" — Kyrtuthrix — Labilithrix — Leptochromothrix — Leptothrix — Leucothrix — Limnothrix — "Candidatus Marithrix" — Methanothrix — "Candidatus Microthrix" — "Candidatus Neomicrothrix" corrig. — "Candidatus Nephrothrix" — Ophiothrix — Pegethrix — Pelagothrix — Planktothrix — Polythrix — Prochlorothrix — Proterendothrix — Rapidithrix — Saccharothrix — Salinithrix — "Candidatus Sarcinithrix" — Schizothrix — [Streptothrix] — "Candidatus Symbiothrix" — "Symphyothrix" — Tapinothrix — "Thermanaerothrix" — Thermosporothrix — Thermothrix — Thioflexithrix — Thiothrix — Tolypothrix — Toxothrix — "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: 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 Allopolytropus" corrig. — "Candidatus Polytropus"
Gender: neuter
Examples: Eperythrozoon