Cladida is a major subgroup of crinoids with a complicated taxonomic history. Cladida was originally applied to a wide assortment of extinct crinoids with a dicyclcic calyx. Under this original definition, cladids would represent a

paraphyletic In taxonomy (general), taxonomy, a group is paraphyletic if it consists of the group's most recent common ancestor, last common ancestor and most of its descendants, excluding a few Monophyly, monophyletic subgroups. The group is said to be pa ...

order ancestral to several other major crinoid groups, particularly the living Articulata. More recently, Cladida has been redefined as a

monophyletic In cladistics for a group of organisms, monophyly is the condition of being a clade—that is, a group of taxa composed only of a common ancestor (or more precisely an ancestral population) and all of its lineal descendants. Monophyletic gro ...

parvclass of pentacrinoids which encompasses articulates and the extinct Flexibilia (flexibles). Cladids also include various minor taxa such as the hybocrinids and " cyathocrines". As flexibles were not originally considered cladids, the new subgroup Eucladida has been erected for cladids which are more derived than flexibles. Cladida is the

sister group In phylogenetics, a sister group or sister taxon, also called an adelphotaxon, comprises the closest relative(s) of another given unit in an evolutionary tree. Definition The expression is most easily illustrated by a cladogram: Taxon A and t ...

Disparida Disparida is an parvclass of extinct marine animals in the class Crinoidea. Disparids are a speciose and morphologically diverse group of crinoids distinguished by their monocyclic calyx and slender arms without pinnules. They range from the Earl ...

, another large group of extinct crinoids.

Taxonomy

* Parvclass Cladida ** Superorder † Porocrinoidea *** Order † Hybocrinida *** Order † Porocrinida ** Superorder † Flexibilia *** Order † Sagenocrinida *** Order † Taxocrinida ** Magnorder Eucladida *** † Ampelocrinida ('' incertae sedis'') *** Superorder † Cyathoformes **** †" Cyathocrinida" ('' incertae sedis'') **** †" Dendrocrinida" ('' incertae sedis'') **** †" Poteriocrinida" ('' incertae sedis'') *** Superorder Articulata **** Order † Encrinida **** Order † Holocrinida **** Order † Millericrinida **** Order † Roveacrinida **** Order † Uintacrinida **** Order Comatulida **** Order Cyrtocrinida **** Order Hyocrinida **** Order Isocrinida

List of genera

* ''

Aaglacrinus ''Aaglacrinus'' is an extinct genus of crinoidea in the ''Cladia'' order. It has been proposed that it was a stationary (attached) suspension feeder Filter feeders are a sub-group of suspension feeding animals that feed by straining suspend ...

'' * '' Aatocrinus'' * '' Abrachiocrinus'' * '' Acariaiocrinus'' * '' Achradocrinus'' * '' Acylocrinus'' * '' Adinocrinus'' * '' Aenigmocrinus'' * '' Agassizocrinacea'' * '' Agassizocrinoidea'' * '' Agassizocrinus'' * '' Aithriocrinus'' * '' Alcimocrinus'' * '' Allosycocrinus'' * '' Alsopocrinus'' * '' Ampelocrinida'' * '' Ampheristocrinus'' * '' Amphipsalidocrinus'' * '' Anarchocrinus'' * '' Anartiocrinus'' * '' Ancyrocrinus'' * '' Anemetocrinus'' * '' Antihomocrinus'' * '' Apektocrinidae'' * '' Arachnocrinus'' * '' Araeocrinus'' * '' Armenocrinus'' * '' Ascetocrinus'' * '' Asymmetrocrinus'' * '' Atelestocrinus'' * '' Atractocrinus'' * '' Atrapocrinus'' * '' Atremacrinus'' * '' Aulocrinus'' * '' Aulodesocrinus'' * '' Bactrocrinites'' * '' Basleocrinus'' * '' Bathericrinus'' * '' Belanskicrinus'' * '' Benthocrinus'' * '' Bicidiocrinus'' * '' Bolbocrinus'' * '' Bollandocrinus'' * '' Botryocrinidae'' * '' Brabeocrinus'' * '' Briseocrinus'' * '' Bronaughocrinus'' * '' Brychiocrinus'' * '' Bursacrinus'' * '' Cadocrinus'' * '' Caelocrinus'' * '' Carcinocrinus'' * '' Carlopsocrinus'' * '' Cathetocrinus'' * '' Ceratocrinus'' * '' Cercidocrinus'' * '' Cestocrinus'' * '' Clathrocrinus'' * '' Clistocrinus'' * '' Codiacrinus'' * ''

Coenocystis ''Coenocystis'' is a genus of green algae in the family Radiococcaceae Radiococcaceae is a family of green algae in the order Sphaeropleales. Genera , AlgaeBase accepted the following genera: * Catenococcus F.Hindák * Chlororustica Shin Wa ...

'' * '' Contignatindocrinus'' * '' Corematocrinus'' * '' Corynecrinus'' * '' Corythocrinus'' * '' Cradeocrinus'' * '' Cranocrinus'' * '' Cricocrinus'' * '' Cromyocrinacea'' * '' Cromyocrinus'' * ''

Crotalocrinites ''Crotalocrinites'', also known as the feather star, is a genus of extinct sea lily belonging to the family Crotalocrinitidae. These feather stars were stationary intermediate-level organisms feeding on suspension epifauna. They lived in the Si ...

'' * '' Cryphiocrinus'' * '' Culmicrinus'' * '' Cyathocrinacea'' * ''

Cydrocrinus ''Cydrocrinus'' is an extinct genus of crinoids. Fossil records This genus is known in the fossil records of the Carboniferous The Carboniferous ( ) is a geologic period and system of the Paleozoic that spans 60 million years from the end o ...

'' * '' Cyliocrinus'' * '' Dasciocrinus'' * '' Denariocrinus'' * '' Dendrocrinina'' * '' Depaocrinus'' * '' Derbiocrinus'' * '' Dichostreblocrinus'' * '' Dictenocrinus'' * '' Dinotocrinus'' * '' Edapocrinus'' * '' Eifelocrinus'' * '' Eirmocrinus'' * '' Elicrinus'' * '' Enallocrinus'' * '' Eopilidiocrinus'' * '' Epipetschoracrinus'' * '' Eratocrinus'' * '' Ethelocrinus'' * ''

Eucladida Cladida is a major subgroup of crinoids with a complicated taxonomic history. Cladida was originally applied to a wide assortment of extinct crinoids with a dicyclcic calyx. Under this original definition, cladids would represent a paraphyletic o ...

'' * '' Euerisocrinus'' * '' Eupachycrinus'' * '' Euspirocrinus'' * '' Exaetocrinus'' * '' Exochocrinus'' * '' Exoriocrinus'' * '' Exterocrinus'' * '' Fifeocrinus'' * '' Flexibilia'' * '' Follicrinus'' * '' Forthocrinus'' * '' Gastrocrinus'' * '' Goniocrinus'' * '' Gothocrinus'' * '' Hallocrinus'' * '' Harmostocrinus'' * '' Harrellicrinus'' * '' Hemiindocrinus'' * '' Hemimollocrinus'' * '' Hemistreptacron'' * '' Holcocrinus'' * '' Hosieocrinus'' * '' Hydreionocrinus'' * '' Hydriocrinus'' * '' Hydroporocrinus'' * '' Hylodecrinus'' * '' Idaeumocrinus'' * '' Idosocrinus'' * '' Imitatocrinus'' * '' Indocrinus'' * '' Intermediacrinus'' * '' Jahnocrinus'' * '' Kalpidocrinus'' * '' Kanabinocrinus'' * '' Kansacrinus'' * '' Kooptoonocrinus'' * '' Kopficrinus'' * '' Kophinocrinus'' * '' Laccocrinus'' * '' Lageniocrinus'' * '' Lanecrinus'' * '' Lasiocrinus'' * '' Laudonocrinus'' * '' Lebetocrinus'' * '' Lecythocrinus'' * '' Lekocrinus'' * '' Linobrachiocrinus'' * '' Linocrinus'' * '' Lobalocrinus'' * '' Lopadiocrinus'' * '' Lophocrinacea'' * '' Lophocrinus'' * '' Malaiocrinus'' * '' Manicrinus'' * '' Mantikosocrinus'' * '' Maragnicrinus'' * '' Marathonocrinus'' * '' Mathericrinus'' * '' Menniscocrinus'' * '' Metaffinocrinus'' * '' Metasycocrinus'' * '' Miatschkovocrinus'' * '' Mictocrinus'' * '' Moapocrinus'' * '' Mollocrinus'' * '' Monobrachiocrinus'' * '' Mooreocrinus'' * '' Moscovicrinus'' * '' Myrtillocrinus'' * '' Nacocrinus'' * '' Nactocrinus'' * '' Nanocrinus'' * '' Nassoviocrinus'' * '' Neocatacrinus'' * '' Neolageniocrinus'' * '' Nereocrinus'' * '' Notiocrinus'' * '' Nuxocrinus'' * '' Oligobrachyocrinus'' * '' Ophiurocrinus'' * '' Oxynocrinus'' * '' Pagecrinus'' * '' Paianocrinus'' * '' Parabotryocrinus'' * '' Paracosmetocrinus'' * '' Paracydonocrinus'' * '' Paradelocrinus'' * '' Paragraphiocrinus'' * '' Parapernerocrinus'' * '' Paraplasocrinus'' * '' Parascytalocrinus'' * '' Parastachyocrinus'' * '' Parastephanocrinus'' * '' Parasycocrinus'' * '' Paratimorocidaris'' * '' Parazeacrinites'' * '' Parindocrinus'' * ''

Parisangulocrinus ''Parisangulocrinus'' is an extinct genus of crinoids from the Early Devonian The Devonian ( ) is a geologic period and system of the Paleozoic era, spanning 60.3 million years from the end of the Silurian, million years ago (Mya) ...

'' * '' Parisocrinus'' * '' Pegocrinus'' * '' Pelecocrinus'' * '' Pellecrinus'' * '' Pentaramicrinus'' * '' Pentececrinus'' * '' Permiocrinus'' * ''

Pernerocrinus ''Pernerocrinus'' is an extinct genus of crinoids from the Devonian The Devonian ( ) is a geologic period and system of the Paleozoic era, spanning 60.3 million years from the end of the Silurian, million years ago (Mya), to the be ...

'' * '' Petalambicrinus'' * '' Petschoracrinus'' * '' Phanocrinus'' * '' Pilidiocrinus'' * '' Pirasocrinus'' * '' Platyfundocrinus'' * '' Polygonocrinus'' * '' Porocrinoidea'' * '' Poteriocrinitina'' * '' Premanicrinus'' * '' Prininocrinus'' * '' Proampelocrinus'' * '' Probletocrinus'' * '' Prochoidiocrinus'' * '' Proctothylacocrinus'' * '' Proindocrinus'' * '' Prolobocrinus'' * '' Psilocrinus'' * '' Pskovicrinus'' * '' Pulaskicrinus'' * '' Pumilindocrinus'' * '' Pyrenocrinus'' * '' Ramulocrinus'' * '' Retusocrinus'' * '' Rhabdocrinus'' * '' Rhadinocrinus'' * '' Rhenocrinus'' * '' Rhopalocrinus'' * '' Rhopocrinus'' * '' Rimosidocrinus'' * '' Roemerocrinus'' * '' Saccosompsis'' * '' Sardinocrinus'' * '' Sarocrinus'' * '' Scammatocrinus'' * '' Schedexocrinus'' * '' Schistocrinus'' * '' Schultzicrinus'' * '' Scoliocrinus'' * '' Scotiacrinus'' * '' Sellardsicrinus'' * '' Separocrinus'' * '' Sigambrocrinus'' * '' Simocrinus'' * '' Sphaerocrinus'' * '' Springericrinus'' * '' Stachyocrinus'' * '' Staphylocrinus'' * '' Stinocrinus'' * '' Streblocrinus'' * '' Streptocrinus'' * '' Sublobalocrinus'' * '' Sycocrinites'' * '' Syndetocrinus'' * '' Tarachiocrinus'' * '' Telikosocrinus'' * '' Tenagocrinus'' * '' Terpnocrinus'' * '' Tetrabrachiocrinus'' * '' Tetrapleurocrinus'' * '' Texacrinacea'' * '' Thalamocrinus'' * '' Thenarocrinus'' * '' Thetidicrinus'' * '' Tholocrinus'' * '' Thyridocrinus'' * '' Timorechinus'' * '' Treocrinus'' * '' Trimerocrinus'' * '' Tyrieocrinus'' * ''

Ulrichicrinus ''Ulrichicrinus'' is an extinct genus of crinoids. Fossil records This genus is known in the fossil records of the Carboniferous period of United States (age range: from 345.3 to 342.8 million years ago). References * See also List of crin ...

'' * '' Ureocrinus'' * '' Vasocrinus'' * '' Wetherbyocrinus'' * '' Woodocrinus'' * '' Worthenocrinus'' * '' Yakovlevicrinus'' * '' Zeacrinitacea'' * '' Zeacrinites'' * '' Zeusocrinus'' * '' Zostocrinus'' * '' Zygotocrinus''

References

External links

Cladida
in the

Paleobiology Database The Paleobiology Database is an online resource for information on the distribution and classification of fossil animals, plants, and microorganisms. History The Paleobiology Database (PBDB) originated in the NCEAS-funded Phanerozoic Marine Paleo ...

Early Ordovician first appearances Crinoidea {{paleo-crinoidea-stub