Hoek, Mann and Jahns system explained

The Hoek, Mann and Jahns system is a system of taxonomy of algae. It was first published in Algae: An Introduction to Phycology by Cambridge University Press in 1995.

Division Cyanophyta (= Cyanobacteria)

See main article: Cyanophyta.

Class Cyanophyceae

Order Chroococcales (e.g., Cyanothece, Aphanothece, Merismopedia, Chroococcus, Gloeocapsa, Microcystis, Chamaesiphon)

Order Pleurocapsales (e.g., Cyanocystis, Pleurocapsa)

Order Oscillatoriales (e.g., Oscillatoria, Lyngbya, Microcoleus)

Order Nostocales (e.g., Nostoc, Anabaena, Aphanizomenon, Scytonema, Rivularia)

Order Stigonematales (e.g., Stigonema)

Division Prochlorophyta

See main article: Prochlorophyta.

Class Prochlorophyceae (e.g., Prochloron, Prochlorococcus, Prochlorothrix)

Division Glaucophyta

See main article: Glaucophyta.

Class Glaucophyceae (e.g., Cyanophora, Glaucocystis)

Division Rhodophyta

See main article: Rhodophyta.

Class Bangiophyceae

Order Porphyridiales (e.g., Porphyridium, Chroodactylon)

Order Rhodochaetales (e.g., Rhodochaete)

Order Erythropeltidales (e.g., Erythrotrichia)

Order Bangiales (e.g., Porphyra, Bangia)
Class Florideophyceae

Order Acrochaetiales (e.g., Audouinella)

Order Palmariales (e.g., Palmaria, Rhodophysema)

Order Nemaliales (e.g., Nemalion, Galaxaura)

Order Batrachospermales (e.g., Lemanea, Batrachospermum)

Order Corallinales (e.g., Lithophyllum, Jania)

Order Bonnemaisoniales

Order Gelidiales (e.g., Gelidium)

Order Gigartinales (e.g., Acrosymphyton, Dumontia, Chondrus, Mastocarpus)

Order Gracilariales

Order Ahnfeltiales

Order Rhodymeniales (e.g., Chylocladia)

Order Ceramiales (e.g., Polysiphonia, Callithamnion, Ceramium, Hypoglossum)

Division Heterokontophyta

See main article: Heterokontophyta.

Class Chrysophyceae

Order Ochromonadales (e.g., Ochromonas, Pseudokephyrion, Dinobryon)

Order Mallomonadales (= Class Synurophyceae, e.g., Mallomonas, Synura)

Order Pedinellales (= Class Pedinellophyceae, e.g., Pedinella)

Order Chrysamoebidales (e.g., Rhizochrysis, Chrysarachnion)

Order Chrysocapsales (e.g., Chrysocapsa, Hydrurus)

Order Chrysosphaerales (e.g., Chrysosphaera)

Order Phaeothamniales (e.g., Phaeothamnion, Thallochrysis)
Class Parmophyceae

Order Parmales (e.g., Pentalamina)
Class Sarcinochrysidophyceae

Order Sarcinochrysidales (e.g., Ankylochrysis, Sarcinochrysis, Nematochrysis)
Genus Pelagococcus (relative of the Chrysophyceae)
Class Xanthophyceae

Order Chloramoebales (e.g., Chloromeson)

Order Rhizochloridales (e.g., Rhizochloris, Myxochloris)

Order Heterogloeales (e.g., Gloeochloris)

Order Mischococcales (e.g., Chloridella, Botrydiopsis, Characiopsis, Ophiocytium)

Order Tribonematales (e.g., Tribonema, Heterococcus, Heterodendron)

Order Botrydiales (e.g., Botrydium)

Order Vaucheriales (e.g., Vaucheria)
Class Eustigmatophyceae (e.g., Ellipsoidion, Eustigmatos [= [[Pleurochloris]]], Polyedriella, Vischeria, Chlorobotrys, Nannochloropsis)
Class Bacillariophyceae (= Diatomophyceae)

Order Pennales (e.g., Navicula, Gyrosigma, Achnanthes, Tabellaria, Nitzchia, Surirella)

Order Centrales (e.g., Coscinodiscus, Thalassiosira, Stephanodiscus, Cerataulus, Triceratium, Odontella, Rhizosolenia)
Class Raphidophyceae (e.g., Chatonella, Gonyostomum, Merotrichia, Vacuolaria, Fibrocapsa)
Class Dictyochophyceae (e.g., Dictyocha)
Class Phaeophyceae

Order Ectocarpales (e.g., Phaeostroma, Spongonema, Ectocarpus)

Order Sphacelariales (e.g., Sphacelaria)

Order Syringodermatales

Order Dictyotales (e.g., Dictyota)

Order Scytosiphonales (e.g., Scytosiphon)

Order Cutleriales (e.g., Cutleria)

Order Dictyosiphonales (e.g., Dictyosiphon)

Order Chordariales (e.g., Sphaerotrichia, Liebmania, Elachista)

Order Sporochnales

Order Desmarestiales (e.g., Desmarestia)

Order Laminariales (e.g., Laminaria, Chorda)

Order Fucales (e.g., Fucus, Hormosira)

Order Durvillaeales (e.g., Durvillaea)

Order Ascoseirales
Class Bicocoecida (e.g., Pseudobodo, Cafeteria)
Class Oomycetes (e.g., Phytophthora)
- Class Hyphochytridiomycetes Class Labyrinthulomycetes

Division Haptophyta (= Prymnesiophyta)

See main article: Haptophyta.

Class Haptophyceae

Order Prymnesiales (e.g., Chrysochromulina, Prymnesium, Corymbellus, Phaeocystis)

Order Isochrysidales (e.g., Chrysotila, Pleurochrysis [= ''[[Hymenomonas]]])

Order Coccolithophorales (e.g., Emiliania, Syracosphaera, Discosphaera)

Order Pavlovales (e.g., Pavlova)

Division Cryptophyta

See main article: Cryptophyta.

Class Cryptophyceae (e.g., Cryptomonas, Chilomonas, Bjornbergiella)

Division Dinophyta

See main article: Dinophyta.

Class Dinophyceae

Order Gymnodiniales (e.g., Gymnodinium, Symbiodinium, Polykrikos)

Order Gloeodiniales (e.g., Gloeodinium)

Order Thoracosphaerales (e.g., Thoracosphaera)

Order Phytodiniales (= Dinococcales, e.g., Phytodinium)

Order Dinotrichales (e.g., Dinoclonium)

Order Dinamoebidales (e.g., Stylodinium, Dinamoebidium)

Order Noctilucales (e.g., Noctiluca)

Order Blastodiniales (e.g., Blastodinium)

Order Syndiniales

Order Peridiniales (e.g., Peridinium, Protoperidinium, Ceratium, Gonyaulax)

Order Dynophysiales (e.g., Dinophysis, Triposolenia, Amphisolenia, Ornithocercus, Histioneis)

Order Prorocentrales (e.g., Prorocentrum)

Division Euglenophyta

See main article: Euglenophyta.

Class Euglenophyceae

Order Euglenales (e.g., Euglena, Astasia)

Order Eutreptiales

Order Euglenamorphales

Order Rhabdomonadales

Order Sphenomonadales

Order Heteronematales

Division Chlorarachniophyta

See main article: Chlorarachniophyta.

Class Chlorarachniophyceae (e.g., Chlorarachnion)

Division Chlorophyta

See main article: Chlorophyta.

Class Prasinophyceae

Order Mamiellales (e.g., Mamiella, Bathycoccus)

Order Pseudoscourfieldiales (e.g., Nephroselmis)

Order Pyramimonadales (e.g., Pyramimonas, Halosphaera, Pachysphaera [?], Pterosperma [?], Mesostigma [?])

Genus Pedinomonas (sometimes classified in the class Pedinophyceae, or Loxophyceae)

Order Chlorodendrales (e.g., Tetraselmis)
Class Chlorophyceae

Order Volvocales [including the [[Tetrasporales]]] (e.g., Chlamydomonas, Chlorogonium, Hyalogonium, Gloeomonas, Diplostauron, Polytoma, Carteria, Brachiomonas, Lobomonas, Sphaerellopsis, Haematococcus, Phacotus, Pteromonas, Stephanosphaera, Gonium, Pandorina, Eudorina, Volvox, Pseudosphaerocystis)

Order Chlorococcales (e.g., Chlorococcum, Golenkinia, Chlorella, Chodatella, Oocystis, Kirchneriella, Nephrocytium, Actinastrum, Crucigenia, Sphaerocystis, Coccomyxa, Scenedesmus, Hydrodictyon, Pediastrum, Chlorosarcinopsis, Cylindrocapsa, Geminella, Binuclearia, Radiofilum, Sphaeroplea, Characiosiphon, Atractomorpha)

Order Chaetophorales (e.g., Uronema, Stigeoclonium, Draparnaldia, Schizomeris)

Order Oedogoniales (e.g., Oedogonium)
Class Ulvophyceae

Order Codiolales (e.g., Chlorocystis, Ulothrix, Spongomorpha, Urospora, Acrosiphonia, Monostroma)

Order Ulvales (e.g., Ulva, Enteromorpha, Ulvaria, Acrochaete)
Class Cladophorophyceae

Order Cladophorales (e.g., Cladophora, Chaetomorpha, Rhizoclonium, Struvea, Valonia, Siphonocladus, Dictyosphaeria)
Class Bryopsidophyceae

Order Bryopsidales (e.g., Bryopsis, Pseudobryopsis, Derbesia, Codium)

Order Halimedales (e.g., Udotea, Penicillus, Halimeda, Caulerpa)
Class Dasycladophyceae

Order Dasycladales (e.g., Acetabularia, Batophora, Dasycladus, Neomeris, Cymopolia)
Class Trentepohliophyceae

Order Trentepohliales (e.g., Trentepohlia, Cephaleuros)
Class Pleurastrophyceae

Order Pleurastrales (e.g., Trebouxia, Myrmecia, Friedmannia, Pleurastrosarcina, Pleurastrum, Microthamnion)
Position uncertain:

Order Prasiolales (e.g., Prasiola)
Class Klebsormidiophyceae

Order Klebsormidiales (e.g., Chlorokybus, Raphidonema, Klebsormidium)

Order Coleochaetales (e.g., Chaetosphaeridium, Coleochaete)
Class Zygnematophyceae

Order Zygnematales (e.g., Spirogyra, Mougeotia, Zygnema, Spirotaenia, Cylindrocystis, Netrium)

Order Desmidiales (e.g., Cosmarium, Gonatozygon, Closterium, Pleurotaenium, Tetmemorus, Euastrum, Micrasterias, Cosmocladium, Xanthidium, Staurastrum, Desmidium, Hyalotheca, Spondylosium, Sphaerozosma, Onychonema)
Class Charophyceae

Order Charales (e.g., Chara, Lamprothamnium, Nitellopsis, Nitella, Tolypella)

Note added in proof

In a note added in proof, an alternative classification is presented for the class Chlorophyceae:

Class Chlamydophyceae

Order Chaetophorales

Order Chlorococcales (e.g., Chlorococcum, Chlorosarcinopsis, Cylindrocapsa [?])

Order Chlorellales (e.g., Chlorella, Kirchneriella, Scenedesmus, Hydrodictyon, Pediastrum, Sphaeroplea, Atractomorpha)
Class Oedogoniophyceae

Order Oedogoniales (e.g., Oedogonium)

Many examples of genus given in the book could not be assigned to one of these classes, because the ultrastructural characteristics needed for their classification have not yet been studied.

External links

Book: van den Hoek, C. . Algae: An Introduction to Phycology . Mann . D. G. . Jahns . Hans Martin . Cambridge University Press . 1995 . 9780521304191.