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Key to Coral Genera (in alphabetical order)

Family Acroporidae No axial corallite Corallites <2mm in diameter, columella absent Branches without basal structures Genus Anacropora (1:168, see below)
Branches with basal structures Genus Montipora (1:62, see below)
Corallites obvious (>2mm), columella present Genus Astreopora (1:434, see below)
Axial corallites on branch ends Genus Acropora (1:176, see below)
Family Agariciidae Colony not massive Corallite centers discernible Polyps aligned between collines Corallites without individual walls Genus Agaricia (2:170)
Corallites with individual walls Genus Leptoseris (2:202, see below)
Polyps not aligned between collines Genus Pavona (2:178, see below)
Corallite centers not discernible Genus Pachyseris (2:224)
Colony massive Corallites in concavities Genus Gardineroseris (2:222)
Corallites not in concavities Genus Coeloseris (2:221)
Family Astrocoeniidae Colonies encrusting, corallites inconspicuous Coenosteum style present Genus Stylocoeniella (2:4)
No coenosteum style Genus Stephanocoenia (2:9)
Colonies becoming branching, corallites conspicuous Septa with free margins Genus Palauastrea (2:10)
Septa fused with columella Genus Madracis (2:12 see below)
Family Caryophylliidae Genus Heteropyathus (2:412)
Family Dendrophylliidae Colony attached to substrate Colony with fronds or encrusting Genus Turbinaria (2:388, see below)
Colony composed of branches Branches subdivide Genus Duncanopsammmia (2:405)
Branches do not subdivide Genus Balanophyllia (2:406)
Colony not attached to substrate Genus Heteropsammia (2:407)
Family Euphyllidae Colonies do not vesicles extended during daytime Colonies have V-shaped valleys Genus Catalaphyllia (2:82)
Colonies do not have V-shaped valleys Colonies have tentacles Genus Euphyllia (2:68 see below)
Colonies have mantles Genus Nemenzophyllia (2:84)
Colonies have vesicles or mantles extended during daytime Colonies not massive Genus Plerogyra (2:86)
Colonies massive Genus Plysogyra (2:92)
Family Faviidae Colonies phaceloid Corallites small (<5mm diameter) Genus Cladocora (3:88)
Corallites not small (>5mm diameter) Genus Caulastrea (3:91)
Colonies flabello-meandroid Genus Erythrastrea
Colonies massive or derived from massive Budding intratentacular or meandroid Colonies plocoid Coraliites not exsert Genus Favia (3:100 see below)
Corallites exsert Genus Barabattoia (3:133)
Colonies cerioid to secondarily meandroid Paliform lobes present Paliform lobes not prominent Genus Favites (3:134)
Paliform lobes prominent Valleys <10mm across Genus Goniastrea (3:156, see below)
Valleys >10mm across Ambulacral groove present Colonies large Genus Colpophyllia (3:210)
Colonies Small Genus Manicina (3:99)
Ambulacral groove absent Genus Oulophyllia (3:195)
Paliform lobes absent or weakly developed Paliform lobes spongy Ambulacral groove absent Genus Platygyra (3:176)
Ambulacral groove present Genus Diploria (3:206)
Paliform lobes wall-like Genus Leptoria (3:202)
Colonies branching Genus Australogyra (3:194)
Budding extratentacular Corallites small (<4mm diameter) Corallites crowded Genus Cyphastrea (3:240)
Corallites not crowded Genus Plesiastrea (3:226)
Corallites middle-sized (?mm diameter) Corallites plocoid Colonies submassive Septa strongly alternate Genus Oulastrea (3:229)
Septa do not alternate Genus Montrastrea (3:212)
Colonies massive to columnar Genus Solenastrea (3:250)
Corallites cerioid Genus Leptastrea (3:232)
Corallites subplocoid Genus Parasimplastrea (3:239)
Corallites large, conspicuous (?mm diameter) Corallites cerioid Genus Moseleya (3:269)
Corallites plocoid Genus Diploastrea (3:230)
Colonies explanate to branching Genus Echinopora (3:252)
Family Fungiidae Not colonial Free living Central mouth dominant Disc small, costae inconspicuous Disc entire Genus Cycloseris (2:236)
Disc partitioned into segments Genus Diaseris (2:248)
Disc not small, costae conspicuous Septal teeth not large lobes Genus Fungia (2:256)
Septal teeth large lobes Genus Heliofungia (2:254)
Axial furrow dominant Genus Ctenactis (2:286)
Attached to substrate Genus Cantharellus (2:251)
Colonial Colony free living Axial furrow indistinct Genus Herpolitha (2:291)
Axial furrow indistinct or absent Septo-costae petaloid Genus Polyphyllia (2:294)
Septo not petaloid Corallites robust, crowded Genus Sandalolitha (2:296)
Corallites not robust or crowded Colonies delicate domes Genus Zoopilus
Colonies not delicate domes Genus Halomitra (2:300)
Colony attached to substrate Colony mostly encrusting Genus Lithophyllon
Colony mostly explanate Genus Podabacia (2:310)
Family Meandrinidae Colony not phaceloid Colony meandroid Valleys convoluted Colony hemispherical Genus Ctenella (2:123)
Colony columnar Genus Dendrogyra (2:126)
Valleys not convoluted Columella present Genus Meandrina (2:120)
Columellae absent Genus Gyrosmilia (2:128)
Colony not meandroid Colony plocoid Genus Dichocoenia (2:124)
Colony not plocoid Genus Montigyra (2:129)
Colony phaceloid Genus Eusmilia (2:130)
Family Merulinidae Monticules developed Genus Hydnophora (2:364)
Monticules not developed Colony consists of branches and/or laminae No basal laminae Genus Paraclavarina (2:374)
With basal laminae Genus Merulina (2:376)
Colony massive Genus Boninastrea
Colony columnar Genus Scapophyllia (2:383)
Family Mussidae Colonial Corallites <12mm diameter Colony phaceloid Genus Blastomussa (3:4)
Colony Cerioid Genus Micromussa (3:8)
Corallites >12mm diameter Colony cerioid to subplocoid Septal teeth pointed Genus Acanthastrea (3:12)
Septal teeth beaded Genus Mussismilia (3:34)
Colony subplocoid to submeandroid Genus Isophyllia (3:36)
Colony phaceloid to flabello-meandroid Corallites numerous Genus Lobophyllia (3:38)
Corallites not numerous Genus Mussa (3:64)
Colony meandroid Septal teeth very prominent Genus Symphyllia (3:52)
Septal teeth not very prominent Valleys mostly radiate Genus Mycetophyllia (3:72)
Valleys concentric Genus Australomussa (3:80)
Non Colonial Septal teeth pointed Genus Scolymia (3:66)
Septal teeth lobed Septal teeth very large Genus Cynarina (3:82)
Septal teeth not very large Genus Indophyllia (3:81)
Family Oculinidae Septa <2mm exsert Colony branching Budding intratentacular Genus Oculina (2:98)
Budding extratentacular Genus Schizoculina (2:104)
Colony not branching Genus Simplastrea (2:103)
Septa >2mm exsert Genus Galaxea (2:106)
Family Pectiniidae
Corallites more conspicuous than coenostial structures Non-colonial Genus Echinomorpha (2:333)
Colonial genera Coenostial pits present Genus Oxypora (2:334)
Coenostial pits absent Corallites not inclined Genus Echinophyllia (2:334)
Corallites inclined Genus Mycedium (2:342)
Coenostial structures very conspicuous Genus Pectinia (2:348)
Family Pocilloporidae Colonies have verrucae Genus Pocillopora (2:24)
Colonies do not have verrucae Branches fine (Genus Seriatopora (2:46)
Branches robust (>?mm diameter) Genus Stylophora (2:56)
Family Poritidae Corallites <2mm diameter Septa fused in non-cyclical pattern Genus Porites (3:276)
Septa not fused Columella present Genus Stylaraea (3:346)
Columella absent Genus Poritipora (3:347)
Corallites >2mm diameter Skeleton robust, not very porous Genus Goniapora (3:348)
Skeleton delicate, very porous Genus Alveopora (3:380)
Family Rhizangiidae Genus Astrangia (2:319)
Family Siderastreidae Corallite walls well defined Colony plocoid Genus Horastrea (2:136)
Colony not plocoid Colony cerioid Septal teeth saw-like Genus Pseudosiderastrea (2:134)
Septal teeth not saw-like Genus Siderastrea (2:138)
Colony not cerioid Genus Anomastraea (2:137)
Corallite walls not well defined Corallites < 3 mm diameter Genus Psammocora (2:144)
Corallites > 3 mm diameter Genus Coscinaraea (2:158)
Family Trachyphylliidae Genus Trahyphyllia (3:272)
Key to Coral Genera (Based on Veron 2000, Corals of the World)