List of extant animal genera represented in the fossil record

A

*"Caberea"
*"Cabestanna"
*"Cadella"
*"Cadulus"
*"Caecum"
*"Caesia"
*"Caesio"
*"Calamocrinus"
*"Calamus"
*"Calantica"
*"Calappa"
*"Calappilia"
*"Calcancora"
*"Calcancorella"
*"Calcitrapessa"
*"Calclamnella"
*"Calclamnoidea"
*"Calcligula"
*"Callanaitis"
*"Callianassa"
*"Callianax"
*"Calliaster"
*"Calliderma"
*"Callimitra"
*"Callinectes"
*"Callionymus"
*"Calliostoma"
*"Calliotectum"
*"Calliotropis"
*"Callista"
*"Callistele"
*"Callistochiton"
*"Callistocypraea"
*"Callistocythere"
*"Callistotapes"
*"Callithaca"
*"Calloarca"
*"Callocardia"
*"Callochiton"
*"Callolongchaeus"
*"Callopoma"
*"Callopora"
*"Calloporina"
*"Callorhinus"
*"Callorhynchus"
*"Callucina"
*"Callucinopsis"
*"Callyodon"
*"Calocidaris"
*"Calotrophon"
*"Calpensia"
*"Calpurna"
*"Calthalotia"
*"Calthropella"
*"Calyptogena"
*"Calyptraea"
*"Calyptropsis"
*"Cambarus"
*"Campages"
*"Campanile"
*"Campylocythere"
*"Canarium"
*"Cancellaria"
*"Cancellothyris"
*"Cancer"
*"Cancilla"
*"Canda"
*"Cannartidium"
*"Cannartiscus"
*"Cannobotrys"
*"Cantharidella"
*"Cantharidus"
*"Cantharus"
*"Cantrainea"
*"Capros"
*"Capsella"
*"Capulacmaea"
*"Capulus"
*"Caranx"
*"Carapus"
*"Carcharhinus"
*"Carcharodon"
*"Carcinoplax"
*"Carcinus"
*"Cardilia"
*"Cardinalia"
*"Cardiocardita"
*"Cardioecia"
*"Cardiomya"
*"Cardisoma"
*"Cardita"
*"Carditamera"
*"Carditella"
*"Carditellopsis"
*"Cardites"
*"Carditopsis"
*"Cardium"
*"Cardobairdia"
*"Careliopsis"
*"Caretta"
*"Caribachlamys"
*"Caribiella"
*"Carinaria"
*"Carinocythereis"
*"Carinodrillia"
*"Carota"
*"Carpilius"
*"Carpilodes"
*"Carpocanarium"
*"Carpocanistrum"
*"Carpocanium"
*"Caryocorbula"
*"Caryophyllia"
*"Caryosphaera"
*"Casmaria"
*"Cassidaria"
*"Cassidulus"
*"Cassis"
*"Catenariopsis"
*"Cativella"
*"Caudites"
*"Caulastrea"
*"Caulophacus"
*"Cavilinga"
*"Cavolina"
*"Cellana"
*"Cellaria"
*"Cellarinella"
*"Cellepora"
*"Celleporaria"
*"Celleporella"
*"Celleporina"
*"Cementula"
*"Cenellipsis"
*"Cenocrinus"
*"Cenodiscus"
*"Cenosphaera"
*"Centracanthus"
*"Centrifuga"
*"Centriscus"
*"Centroberyx"
*"Centrobotrys"
*"Centrocardita"
*"Centrophorus"
*"Centropomus"
*"Centropristis"
*"Centrostephanus"
*"Cephalodiscus"
*"Cephalopyramis"
*"Cepola"
*"Cerastoderma"
*"Ceratia"
*"Ceratoporella"
*"Ceratoscopelus"
*"Ceratostoma"
*"Ceratotrochus"
*"Cerithidea"
*"Cerithideops"
*"Cerithideopsilla"
*"Cerithideopsis"
*"Cerithidium"
*"Cerithiella"
*"Cerithioclava"
*"Cerithiopsida"
*"Cerithiopsidella"
*"Cerithiopsis"
*"Cerithiscala"
*"Cerithium"
*"Certonardoa"
*"Cetorhinus"
*"Chaceia"
*"Chaenogaleus"
*"Chaetodon"
*"Chaetopleura"
*"Chaeturichthys"
*"Chama"
*"Chamaesipho"
*"Chamelea"
*"Chametrachea"
*"Chanda"
*"Chanos"
*"Chaperia"
*"Characodoma"
*"Charonia"
*"Charybdis"
*"Chasmocarcinus"
*"Chasmotheca"
*"Chattonia"
*"Chauliodus"
*"Chaunax"
*"Chauvetia"
*"Cheilea"
*"Cheilinus"
*"Cheilopora"
*"Cheiloporina"
*"Chejudocythere"
*"Chelmon"
*"Chelonia"
*"Chelonibia"
*"Chelyconus"
*"Chemnitzia"
*"Cheramus"
*"Chevallieria"
*"Chiastolus"
*"Chicoreus"
*"Chiiengphoherus"
*"Chilara"
*"Chileutomia"
*"Chilomycterus"
*"Chiloscyllium"
*"Chimaera"
*"Chion"
*"Chione"
*"Chionelasmus"
*"Chioneryx"
*"Chionista"
*"Chionopsis"
*"Chirocentrus"
*"Chirona"
*"Chirostoma"
*"Chiton"
*"Chitonastrum"
*"Chitonotus"
*"Chladocrinus"
*"Chlamydoselachus"
*"Chlamys"
*"Chlathrus"
*"Chlidoniopsis"
*"Chlorodiella"
*"Chlorophthalmus"
*"Chlorostoma"
*"Chondrocidaris"
*"Chondrocladia"
*"Chorilia"
*"Chorizopora"
*"Chorus"
*"Chromis"
*"Chrysallida"
*"Chrysame"
*"Chrysostoma"
*"Chthamalus"
*"Cicatellia"
*"Cidarina"
*"Cidaris"
*"Cilara"
*"Ciliatocardium"
*"Cinclopyramis"
*"Cinctipora"
*"Cinctiscala"
*"Cingula"
*"Cingulina"
*"Cionobrissus"
*"Circe"
*"Circeis"
*"Circomphalus"
*"Circulus"
*"Cirillia"
*"Cirolana"
*"Cirsonella"
*"Cirsotrema"
*"Citharichthys"
*"Citharus"
*"Cittarium"
*"Cladangia"
*"Cladocora"
*"Cladorhiza"
*"Cladospyris"
*"Clanculopsis"
*"Clanculus"
*"Clathrocyclas"
*"Clathrodrillia"
*"Clathromangelia"
*"Clathroscala"
*"Clathrospyris"
*"Clathrus"
*"Clathurella"
*"Claudiconcha"
*"Clausinella"
*"Clava"
*"Clavagella"
*"Clavatula"
*"Clavilithes"
*"Claviporella"
*"Claviscala"
*"Clavus"
*"Cleidochasma"
*"Cleidothaerus"
*"Clementia"
*"Cleobula"
*"Cleotrivia"
*"Cletocythereis"
*"Clibanarius"
*"Clidiophora"
*"Clidoderma"
*"Climacoidea"
*"Clinocardium"
*"Clinopegma"
*"Clinus"
*"Clio"
*"Cliona"
*"Clithrocytheridea"
*"Closia"
*"Clupea"
*"Cluthia"
*"Clypeaster"
*"Clypeola"
*"Clypeolum"
*"Clypeomorus"
*"Clypidina"
*"Cnesterium"
*"Cobitopsis"
*"Coccocyclia"
*"Coccodentalium"
*"Coccodiscus"
*"Coccolarcus"
*"Coccopigya"
*"Cocculina"
*"Cocculinella"
*"Cochiolepis"
*"Cochlespira"
*"Cochlodesma"
*"Codakia"
*"Codonella"
*"Codonellina"
*"Coelopleurus"
*"Coelopora"
*"Coelorhynchus"
*"Coeloseris"
*"Coelotrochus"
*"Coenangia"
*"Coenobita"
*"Coenocyathus"
*"Coleopora"
*"Colina"
*"Collarina"
*"Colliculus"
*"Collisella"
*"Collonista"
*"Colpichthyes"
*"Colpophyllia"
*"Colpospira"
*"Colubraria"
*"Colubrellina"
*"Columbarium"
*"Columbella"
*"Columbellopsis"
*"Colus"
*"Coluzea"
*"Comarmondia"
*"Comaster"
*"Cominella"
*"Cominista"
*"Cominula"
*"Comitas"
*"Compressidens"
*"Compsodrillia"
*"Compsomyax"
*"Comus"
*"Conarchnium"
*"Concavus"
*"Conchocele"
*"Conchoecia"
*"Concholepas"
*"Condylocardia"
*"Condylocuna"
*"Conescharellina"
*"Conger"
*"Conjectura"
*"Conocerithium"
*"Conocrinus"
*"Conocyathus"
*"Conoidacmaea"
*"Conolithes"
*"Conominolia"
*"Conomurex"
*"Conopeum"
*"Conopora"
*"Conosphaera"
*"Conotrochus"
*"Conuber"
*"Conus"
*"Convexopecten"
*"Cookia"
*"Cooperella"
*"Copidozoum"
*"Coptothyris"
*"Copytus"
*"Coralliophaga"
*"Coralliophila"
*"Corallistes"
*"Corallium"
*"Corallospondylus"
*"Corbicula"
*"Corbula"
*"Cordieria"
*"Coriandria"
*"Coripia"
*"Cornucoquimba"
*"Cornutella"
*"Cornuticella"
*"Corocalyptra"
*"Coroniscala"
*"Coronula"
*"Corophiidae"
*"Corticium"
*"Cortina"
*"Cortiniscus"
*"Coryphaenoides"
*"Coryphopterus"
*"Cosa"
*"Coscinaraea"
*"Cosciniopsis"
*"Coscinospongia"
*"Cosmetalepas"
*"Cossmannea"
*"Cossmannica"
*"Costa"
*"Costacallista"
*"Costatoleda"
*"Costazia"
*"Costellaria"
*"Costellipitar"
*"Costokidderia"
*"Cothurnicella"
*"Cotonopsis"
*"Cottonia"
*"Cottopsis"
*"Couthouyia"
*"Coxiella"
*"Crania"
*"Craniella"
*"Craniscus"
*"Cranopsis"
*"Cranosina"
*"Craspedochiton"
*"Crassadoma"
*"Crassatellites"
*"Crassatina"
*"Crassilabrum"
*"Crassimarginatella"
*"Crassinella"
*"Crassispira"
*"Crassispirella"
*"Crassopleura"
*"Crassostrea"
*"Crateromorpha"
*"Crateropora"
*"Cratis"
*"Crawfordina"
*"Crebriscala"
*"Cremides"
*"Crenatula"
*"Crenella"
*"Crenidens"
*"Crenidens"
*"Crenilabium"
*"Crenomytilus"
*"Crenulilimopsis"
*"Crepidacantha"
*"Crepidula"
*"Crepipatella"
*"Crepis"
*"Creseis"
*"Creusia"
*"Cribella"
*"Cribellopora"
*"Cribraria"
*"Cribrilaria"
*"Cribrilina"
*"Crisia"
*"Crisidia"
*"Crisiella"
*"Crisiona"
*"Crisisina"
*"Crisulipora"
*"Cromyodruppa"
*"Cromyomma"
*"Cronia"
*"Crossata"
*"Crossea"
*"Crosseola"
*"Crucibulum"
*"Cryptobranchia"
*"Cryptocapsa"
*"Cryptocephalus"
*"Cryptochiton"
*"Cryptoconchus"
*"Cryptolepas"
*"Cryptomella"
*"Cryptomya"
*"Cryptonatica"
*"Cryptopecten"
*"Cryptoplax"
*"Cryptopora"
*"Cryptopora"
*"Cryptospira"
*"Cryptosula"
*"Ctena"
*"Ctenactis"
*"Ctenoberyx"
*"Ctenocardia"
*"Ctenocheles"
*"Ctenocolpus"
*"Ctenoides"
*"Ctenophoraster"
*"Ctenosciaena"
*"Cubestana"
*"Cubiceps"
*"Cubiculovinea"
*"Cucullaea"
*"Cucullaearca"
*"Cucumarites"
*"Culicia"
*"Cultellus"
*"Cumingia"
*"Cuna"
*"Cunanax"
*"Cunearca"
*"Cuneocythere"
*"Cuneus"
*"Cupidoliva"
*"Cupuladria"
*"Cushmanidea"
*"Cuspidaria"
*"Cuvierina"
*"Cyamiomactra"
*"Cyanocyclas"
*"Cyanoplax"
*"Cyathelia"
*"Cyathidium"
*"Cyathoceras"
*"Cyathodonta"
*"Cyathotrochus"
*"Cycladicama"
*"Cycladophora"
*"Cyclampterium"
*"Cyclaster"
*"Cyclastrum"
*"Cyclicopora"
*"Cyclina"
*"Cyclinella"
*"Cyclocardia"
*"Cyclochlamys"
*"Cyclodostomia"
*"Cycloes"
*"Cyclomactra"
*"Cyclope"
*"Cyclopecten"
*"Cycloperiella"
*"Cyclopoma"
*"Cyclopterus"
*"Cycloscala"
*"Cycloseris"
*"Cyclostrema"
*"Cyclostremela"
*"Cyclostremiscus"
*"Cyclostromella"
*"Cyclosuneta"
*"Cyclotellina"
*"Cyclothone"
*"Cyclothyca"
*"Cycloxanthops"
*"Cylichna"
*"Cylichnatys"
*"Cylichnella"
*"Cylichnina"
*"Cylinder"
*"Cylindriscala"
*"Cylindromitra"
*"Cylindrophyllia"
*"Cyllene"
*"Cymatiella"
*"Cymatium"
*"Cymatogaster"
*"Cymatoica"
*"Cymatophos"
*"Cymatosyrinx"
*"Cymbiola"
*"Cymbium"
*"Cymia"
*"Cymodoce"
*"Cynisca"
*"Cynoscion"
*"Cyphastraea"
*"Cyphoma"
*"Cyphonochelus"
*"Cypraea"
*"Cypraecassis"
*"Cypraeerato"
*"Cyprideis"
*"Cypridina"
*"Cypridopsis"
*"Cyrenobatissa"
*"Cyrenodonax"
*"Cyrtocalpis"
*"Cyrtocapsa"
*"Cyrtodaria"
*"Cyrtopinna"
*"Cyrtopleura"
*"Cyrtorhina"
*"Cystisella"
*"Cystodytes"
*"Cystophora"
*"Cythara"
*"Cytharella"
*"Cytheralison"
*"Cythere"
*"Cytherella"
*"Cytherelloidea"
*"Cytheretta"
*"Cytheridea"
*"Cytherois"
*"Cytheroma"
*"Cytheromorpha"
*"Cytheropteron"
*"Cytherura"

D

*"Fabella"
*"Fabulina"
*"Falsifusus"
*"Falsocythere"
*"Falunia"
*"Faorina"
*"Farrea"
*"Fartulum"
*"Fasciculipora"
*"Fasciolaria"
*"Fastigiella"
*"Fautor"
*"Favartia"
*"Faveolebris"
*"Favia"
*"Favites"
*"Fax"
*"Felaniella"
*"Felicia"
*"Fellaster"
*"Fenestrosyrinx"
*"Fenestrulina"
*"Fibularia"
*"Fictonoba"
*"Ficus"
*"Figularia"
*"Filicrisia"
*"Filifascigera"
*"Filisparsa"
*"Filodrilla"
*"Filograna"
*"Filogranula"
*"Fimbria"
*"Finlayola"
*"Finmarchinella"
*"Fissidentalium"
*"Fissurella"
*"Fissurellidea"
*"Fissurisepta"
*"Fistularia"
*"Fistulobalanus"
*"flabelligerid"
*"Flabellipecten"
*"Flabellopora"
*"Flabellum"
*"Flexopecten"
*"Flexus"
*"Floridina"
*"Floridinella"
*"Florimetis"
*"Flustrella"
*"Foegia"
*"Folina"
*"Foratiscala"
*"Forcepia"
*"Forreria"
*"Forskaelena"
*"Fossacallista"
*"Fossarius"
*"Fossatrivia"
*"Foveoleberis"
*"Fragum"
*"Frenula"
*"Frigidocardium"
*"Friginatica"
*"Frondipora"
*"Fugleria"
*"Fulcrella"
*"Fulgoraria"
*"Fulgurofusus"
*"Fulvia"
*"Fungia"
*"Fungiacava"
*"Fungiacyathus"
*"Fuscibuccinum"
*"Fuscoscala"
*"Fusinus"
*"Fusitriton"
*"Fusiturricula"
*"Fusiturris"
*"Fusoterebra"
*"Fustiaria"
*"Fusus"

*placeholder*

G

*"Iacra"
*"Icelinus"
*"Ichthyococcus"
*"Idasola"
*"Idiotrochus"
*"Idmidronea"
*"Idmonea"
*"Idmoneoides"
*"Ilanga"
*"Ilba"
*"Ilia"
*"Iliochione"
*"Ilisha"
*"Illyanassa"
*"Imbricaria"
*"Immergentia"
*"Inachus"
*"Indocerithium"
*"Infundibulipora"
*"Infundibulops"
*"Inglisella"
*"Inquisitor"
*"Inversiula"
*"Iolaea"
*"Iophon"
*"Iothia"
*"Iphiana"
*"Iphiculus"
*"Iphigenia"
*"Iravadia"
*"Iredalina"
*"Iredalula"
*"Irus"
*"Irusella"
*"Isacia"
*"Isanda"
*"Ischadium"
*"Ischnochiton"
*"Iselica"
*"Ishnula"
*"Isïphyllastrea"
*"Isis"
*"Isistius"
*"Isocrassina"
*"Isocrinus"
*"Isognomon"
*"Isogomphodon"
*"Isophyllia"
*"Isopsetta"
*"Isselia"
*"Istiophorus"
*"Isurus"
*"Ithycythara"
*"Itia"
*"Ivara"
*"Ividella"
*"Ixa"
*"Ixoides"

*placeholder*

J

*"Labioporella"
*"Labiostrombus"
*"Labis"
*"Labrisomus"
*"Labrodon"
*"Labrus"
*"Lacazella"
*"Lacerna"
*"Laciolina"
*"Lacrimula"
*"Lactarius"
*"Laculina"
*"Lacuna"
*"Laemonema"
*"Laetifautor"
*"Laevicardium"
*"Laevichlamys"
*"Laevicirce"
*"Laevicordia"
*"Laevidentalium"
*"Laevistrombus"
*"Laganum"
*"Lagarozoum"
*"Lagenipora"
*"Laiocochlis"
*"Lajonkairia"
*"Lambis"
*"Lamellaria"
*"Lamelliconcha"
*"Lamellinucula"
*"Laminopora"
*"Lamna"
*"Lampadena"
*"Lampanella"
*"Lampanyctodes"
*"Lampanyctus"
*"Lampasopsis"
*"Lampichthyes"
*"Lampris"
*"Lamprocyclas"
*"Lamprocyrtis"
*"Lamprodoma"
*"Lampusia"
*"Lanceopora"
*"Laqueus"
*"Larcidium"
*"Larcopyle"
*"Larcospira"
*"Larimus"
*"Larkinia"
*"Larnacalpis"
*"Larnacantha"
*"Lasaea"
*"Laternula"
*"Lathyrulus"
*"Latiaxis"
*"Latifusus"
*"Latirolagena"
*"Latirus"
*"Latisipho"
*"Latona"
*"Latrunculia"
*"Lautoconus"
*"Lazariella"
*"Ledella"
*"Lefroyella"
*"Leiodermatium"
*"Leiognathus"
*"Leiolambrus"
*"Leionucula"
*"Leiopathes"
*"Leiopyrga"
*"Leiosella"
*"Leiosolenus"
*"Leiostraca"
*"Lekythopora"
*"Lembulus"
*"Lemintina"
*"Lenitrophon"
*"Lentidium"
*"Lentigo"
*"Leochlamys"
*"Leodia"
*"Leopecten"
*"Lepas"
*"Lepeta"
*"Lepetella"
*"Lepidion"
*"Lepidocardia"
*"Lepidochitona"
*"Lepidocottus"
*"Lepidopleurus"
*"Lepidopus"
*"Lepidorhombus"
*"Lepidotrigla"
*"Lepidozona"
*"Lepisosteus"
*"Lepophidium"
*"Leporemax"
*"Leporicypraea"
*"Leporimetis"
*"Lepralia"
*"Lepsiella"
*"Lepsithais"
*"Leptadrillia"
*"Leptastrea"
*"Leptaxinus"
*"Leptegauana"
*"Leptochiton"
*"Leptoconus"
*"Leptocottus"
*"Leptocythere"
*"Leptomithrax"
*"Leptomya"
*"Lepton"
*"Leptopecten"
*"Leptoria"
*"Leptoscopus"
*"Leptoseris"
*"Leptothyra"
*"Leptothyropsis"
*"Lestidiops"
*"Lethops"
*"Leuconia"
*"Leucorhynchia"
*"Leucosia"
*"Leucosilia"
*"Leucosyrinx"
*"Leucozonia"
*"Leufroyia"
*"Leuresthes"
*"Levenia"
*"Libinia"
*"Lichenopora"
*"Lienardia"
*"Ligatella"
*"Lilax"
*"Liloa"
*"Lima"
*"Limacina"
*"Limanda"
*"Limaria"
*"Limatuella"
*"Limatula"
*"Limea"
*"Limneria"
*"Limopsis"
*"Limulatys"
*"Limulus"
*"Linatella"
*"Linckia"
*"Lindisfarnia"
*"Linemera"
*"Linga"
*"Lingula"
*"Liniaxis"
*"Linopyrga"
*"Linucula"
*"Linuparus"
*"Lioberus"
*"Liocerithium"
*"Lioconcha"
*"Liocyma"
*"Lioglyphostoma"
*"Liomesus"
*"Liosphaera"
*"Liotella"
*"Liothyrella"
*"Liotia"
*"Liotina"
*"Lippistes"
*"Lirachiton"
*"Liracraea"
*"Lirastrombina"
*"Liratilia"
*"Liriospyris"
*"Liripora"
*"Lirobittium"
*"Lirocingula"
*"Lironoba"
*"Lirophora"
*"Lirularia"
*"Lischkeia"
*"Lissarca"
*"Lissopecten"
*"Lissospira"
*"Lissotesta"
*"Lissotestella"
*"Lithapium"
*"Lithatractus"
*"Lithelius"
*"Lithobotrys"
*"Lithocampe"
*"Lithocarpium"
*"Lithochytris"
*"Lithoconus"
*"Lithocyclia"
*"Lithognathus"
*"Lithomelissa"
*"Lithomespilus"
*"Lithomitra"
*"Lithopera"
*"Lithophaga"
*"Lithophyllon"
*"Lithopoma"
*"Lithornithium"
*"Lithostrobus"
*"Litigiella"
*"Litiopa"
*"Littoraria"
*"Littorina"
*"Littorinopsis"
*"Littorniscala"
*"Livonia"
*"Liza"
*"Lobantale"
*"Lobianchia"
*"Lobophyllia"
*"Loculicytheretta"
*"Lodderena"
*"Lodderia"
*"Loligo"
*"Lonchistium"
*"Longchaeus"
*"Longicerithium"
*"Longimactra"
*"Lopha"
*"Lophaster"
*"Lophelia"
*"Lophioturris"
*"Lophius"
*"Lophocardium"
*"Lophocochlias"
*"Lophoconus"
*"Lophocorys"
*"Lophocyrtis"
*"Lophogaster"
*"Lophopanopeus"
*"Lophophaena"
*"Lophophyllia"
*"Lophosmilia"
*"Lophospyris"
*"Lorica"
*"Loricella"
*"Loripes"
*"Loripinus"
*"Lota"
*"Lottia"
*"Lovenia"
*"Loxoconcha"
*"Loxoconchella"
*"Loxocorniculum"
*"Loxocythere"
*"Loxoglypta"
*"Loxorhynchus"
*"Lucapina"
*"Lucapinella"
*"Lucerapex"
*"Lucidestea"
*"Lucina"
*"Lucinella"
*"Lucinisca"
*"Lucinoma"
*"Luidia"
*"Lumbriconereis"
*"Lunarca"
*"Lunatia"
*"Lunatica"
*"Lunella"
*"Lunularia"
*"Lunulicardia"
*"Luria"
*"Lutraria"
*"Luvarus"
*"Luvula"
*"Lychnocanium"
*"Lychnodictyum"
*"Lycodopsis"
*"Lycodopsis"
*"Lyconectes"
*"Lydiphnis"
*"Lyidium"
*"Lyncina"
*"Lyonsia"
*"Lyopsetta"
*"Lyratellina"
*"Lyreidus"
*"Lyria"
*"Lyrocardium"
*"Lyrodobankia"
*"Lyromangelia"
*"Lysiosquilla"
*"Lytechinus"

*placeholder*

M

*"Oamaruia"
*"Obex"
*"Obexomia"
*"Oblada"
*"Oblitacythereis"
*"Obtortio"
*"Obtusella"
*"Occultocythereis"
*"Ocenebra"
*"Ochetoclava"
*"Ocinebrellus"
*"Ocinebrina"
*"Octotympanum"
*"Oculina"
*"Ocypode"
*"Odetta"
*"Odobenus"
*"Odontaspis"
*"Odontaster"
*"Odontionella"
*"Odontocyathus"
*"Odostomella"
*"Odostomia"
*"Oenopota"
*"Offadesma"
*"Ogcocephalus"
*"Ogilbia"
*"Ogivalia"
*"Ogivia"
*"Oligoplites"
*"Oligopus"
*"Oliva"
*"Olivancillaria"
*"Olivella"
*"Olivia"
*"Olssonella"
*"Omalogyra"
*"Omalosecosa"
*"Ommatartus"
*"Ommatocampe"
*"Ommatocarcinus"
*"Ommatodiscus"
*"Ommatospyris"
*"Omogymna"
*"Omphalius"
*"Omphalotropis"
*"Oncorhynchus"
*"Oncousoecia"
*"Oniscidia"
*"Onithochiton"
*"Onoba"
*"Onuphis"
*"Onuxodon"
*"Onychocella"
*"Oocorys"
*"Oostrombus"
*"Opalia"
*"Opaliopsis"
*"Opechinus"
*"Ophiacantha"
*"Ophidion"
*"Ophiocnida"
*"Ophiocoma"
*"Ophiocrossota"
*"Ophiocten"
*"Ophiodermella"
*"Ophiodon"
*"Ophiomusium"
*"Ophisthoproctus"
*"Ophisurus"
*"Ophiura"
*"Ophryotrocha"
*"Opimilda"
*"Opisthonema"
*"Oplegnathus"
*"Oplophorus"
*"Oppenheimopecten"
*"Optivus"
*"Orbitestella"
*"Orcinus"
*"Orectospira"
*"Orinella"
*"Orionina"
*"Ornamentaria"
*"Ornaticannula"
*"Orobitella"
*"Orostaurs"
*"Orthopristis"
*"Orthoyoldia"
*"Osilinus"
*"Osmerus"
*"Ossiania"
*"Osthimosia"
*"Ostomya"
*"Ostracion"
*"Ostracoberyx"
*"Ostrea"
*"Ostreola"
*"Otaria"
*"Otatara"
*"Otionella"
*"Otopleura"
*"Otukaia"
*"Oudardia"
*"Oulangia"
*"Oulastrea"
*"Oulophyllia"
*"Ovalipes"
*"Ovatipsa"
*"Ovilia"
*"Ovinotis"
*"Ovirissoa"
*"Ovulactaeon"
*"Oxygyrus"
*"Oxyjulis"
*"Oxymeris"
*"Oxynaspis"
*"Oxynotus"
*"Oxyperas"
*"Oxystele"
*"Ozius"

*placeholder*

P

*"Rabicea"
*"Rachycentron"
*"Racodiscula"
*"Radimella"
*"Radiocondyla"
*"Radiofascigera"
*"Radiopora"
*"Radulinus"
*"Raeta"
*"Raja"
*"Ramphonotus"
*"Randallia"
*"Ranella"
*"Rangia"
*"Raniceps"
*"Ranilia"
*"Ranina"
*"Raninoides"
*"Ranularia"
*"Rapana"
*"Raphitoma"
*"Ratifusus"
*"Ravitrona"
*"Rectiplanes"
*"Recurvina"
*"Redicirce"
*"Regardrella"
*"Reginella"
*"Regozara"
*"Renea"
*"Reniera"
*"Reptadeonella"
*"Reptomultisparsa"
*"Resania"
*"Retepora"
*"Reteporellina"
*"Retizafra"
*"Retropluma"
*"Retusa"
*"Revssirella"
*"Rexea"
*"Rexithaerus"
*"Rhabdus"
*"Rhacochilus"
*"Rhamphostomella"
*"Rhapdopleura"
*"Rhechias"
*"Rhincodon"
*"Rhinobatos"
*"Rhinoclavus"
*"Rhinoptera"
*"Rhizoplegma"
*"Rhizoprionodon"
*"Rhizorus"
*"Rhodosphaera"
*"Rhombocythere"
*"Rhomboidella"
*"Rhopalastrum"
*"Rhopalocanium"
*"Rhynchobatus"
*"Rhynchoconger"
*"Rhyncholampas"
*"Rhynchopygus"
*"Rhynobrissus"
*"Rhyssoplax"
*"Rhytirhynchia"
*"Ricinella"
*"Rictaxis"
*"Rictocyma"
*"Rimacytheropteron"
*"Rimella"
*"Rimula"
*"Ringicula"
*"Ringiculella"
*"Ringiculina"
*"Risella"
*"Risellopsis"
*"Rissoa"
*"Rissoina"
*"Rissolina"
*"Rissomangelia"
*"Rissopsetia"
*"Ritena"
*"Riuguhdrillia"
*"Robertsonites"
*"Rochefortia"
*"Rochefortula"
*"Rochia"
*"Rogerella"
*"Romancheina"
*"Roncador"
*"Roperia"
*"Rosella"
*"Rosseliana"
*"Rossiteria"
*"Rostellaria"
*"Rotula"
*"Rotundracythere"
*"Roxania"
*"Roxaniella"
*"Roya"
*"Rudicardium"
*"Ruditapes"
*"Ruggieria"
*"Ruggieriella"
*"Rugotyphis"
*"Rumphia"
*"Rupellaria"
*"Ryenella"

*"Uberella"
*"Uca"
*"Ulophysema"
*"Umbilia"
*"Umbonium"
*"Umbonula"
*"Umbra"
*"Umbraculum"
*"Umbrina"
*"Uncinulina"
*"Undaria"
*"Undulostrea"
*"Unedogemmula"
*"Ungulina"
*"Uniavicularia"
*"Unicytis"
*"Upogebia"
*"Uranoscopus"
*"Uroconger"
*"Urocyrtis"
*"Urocythereis"
*"Uroleberis"
*"Urolophus"
*"Uromitra"
*"Urophycis"
*"Urosalpinx"
*"Utica"
*"Uttleya"
*"Uvanilla"
*"Uzita"

*placeholder*

V

*"Xancus"
*"Xantho"
*"Xanthochorus"
*"Xanthodius"
*"Xenistius"
*"Xenogalea"
*"Xenophalium"
*"Xenophora"
*"Xenophthalmus"
*"Xenostrobus"
*"Xenotrophon"
*"Xenuroturris"
*"Xestoleberis"
*"Xiphatractus"
*"Xiphias"
*"Xiphodictya"
*"Xiphosphaera"
*"Xylocythere"
*"Xylophaga"
*"Xymene"
*"Xymenella"

*placeholder*

Y

*"Yagudinella"
*"Ybseloscoecia"
*"Yoldia"
*"Yoldiella"

*placeholder*

Z

*"Zabythocypris"
*"Zaclys"
*"Zafra"
*"Zalipais"
*"Zalophus"
*"Zanassarina"
*"Zanclus"
*"Zaniolepis"
*"Zaphon"
*"Zaria"
*"Zeacolpus"
*"Zeacrypta"
*"Zeacumanthus"
*"Zeadmete"
*"Zealeda"
*"Zebina"
*"Zebittium"
*"Zegalerus"
*"Zeidora"
*"Zelithophaga"
*"Zemira"
*"Zemitrella"
*"Zemyllita"
*"Zemysia"
*"Zemysina"
*"Zenatia"
*"Zenatiopsis"
*"Zenepos"
*"Zenion"
*"Zenocentrotus"
*"Zenopsis"
*"Zephos"
*"Zeradina"
*"Zethalia"
*"Zeus"
*"Zeuxis"
*"Zirfaea"
*"Ziziphinus"
*"Zoarces"
*"Zoila"
*"Zonaria"
*"Zonodiscus"
*"Zoroaster"
*"Zygochlamys"
*"Zygocircus"
*"Zygostephanus"

*placeholder*

References