Thursday, September 15, 2011

classes and orders of echinodermata

This classification is based on Hyman done in 1955.He has described the classes and orders of echinodermata which are existing on earth.According to him there are five classes of echinodermata that are listed here with the words that form the class and orders and examples.

    Class1:-Crinoidea  (Gr.,crinon=lily+eidos=form)
                  order:- Articulata
                  Examples:-Antedon, Rhizocrinus, Metacrinus
Metacrinus



Rhizocrinus
  































Class2:-Holothuroidea( Gr.,holothurion=waater polyp+eidos)
                  order1:-Aspidochirota
                  Examples:-Holothuria,Stichopus,Mesothuria
Mesothuria intestinalis

Holothuria tubulosa

Stichopus tremulus

Stichopus







              




  





























  
















order2:-Elasipoda
                 Examples:-Deima, Benthodytes
Benthodytes

Benthodytes

















Deima


Deima










                  


order:3-Dendrochirota
                 Examples:- Thyone,Cucumaria,Phyllophorus
Thyone-fusus

Thyone -







            


cucumaria frondosa

cucumaria miniata

cucumaria piperata

cucumaria planci

cucuaria pulcheerima



      








order4:-Molpadonia
                 Examples:- Molpadia,Paracaudina

                  order5:-Apoda
                 Examples:- Synapta, Chiridoata

   Class3:-Echinoidea (Gr.,echinos=hedgehog+eidos=form)
                  order:1-Lepidocentroda
                 Examples:-Phormosoma,Sperosoma

                   order2:-Cidaroidea
                 Examples:-Cidaris, Notocidaris

                   order3:- Aulodonata
                 Examples:- Diodema, Astropyga

                   order4:- Camarodonata
                 Examples:-Echinus,Strongylocentrotus

   Class4:-Asteroidea (Gr.,aster=star+eidos=form)
                   order1:-Phanerozinia
                 Examples:-Luidia,Astropecten, Archaster,Pentaceros

                   order2:- Spinulosa
                 Examples:- Aesterina,Echinaster,Hymenater,Solaster

                   order3:-Forcipulata
                Examples:- Brisingaster,Heliater,Zoraster,Asterias

   Class5:- Ophiuroidea (Gr., ophis=serpent+oura=tail+eidos=form)
                   order1:-Ophirae
                 Examples:- Ophioderma,Ophioscolex,Ophiothrix

                   order2:-Euryalae
                 Examples:-Asteronyx.Astrophyton,Astoporpa










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