In Venezuela are five classes representatives living today : Crinoidea, Asteroidea, Ophiuroidea, Echinoidea and Holothuroidea.
2.
Extracellular endosymbionts are also represented in all four extant classes of Echinodermata ( Crinoidea, Ophiuroidea, Echinoidea, and Holothuroidea ).
3.
The Echinodermata are radially symmetric and exclusively marine, including starfish ( Asteroidea ), sea urchins, ( Echinoidea ), brittle stars ( Ophiuroidea ), feather stars ( Crinoidea ).
मोबाइल