Is the highest taxonomic rank of organisms There wasn’t predict by Limneo and Wittacker Are Eukarya, Bacteria and Archea Domain The domain that we keep in consideration is EUKARYA
Kingdom In biology, kingdom is a taxonomic rank, which is either the highest rank or in the more recent three-domain system, the rank below domain. Since 1969 Whittacker has introduced 5 domain The Kingdom of echinoderm is those of ANIMAL
Phylum In biology, a phylum is a taxonomic rank below kingdom and above class The symmetry of echinoderm is bilateral, the digestive system has 2 opening, it is an metametric organism The Subphylum is called elethorozea
Charateristics Deuterostome embryo development Secondary radial symmetry: larvae have bilateral symmetry Five radial parts; sea cucumbers developed pseudo- bilateral symmetry Endoskeleton: calcite plates (ossicles) covered by epidermis, may be single plates (flexible body) or fused (solid shell, sea urchin) Spines on calcite plates give “spiny skin” (phylum name!) sea urchin spines are endoskeleton and covered by thin skin!
A particoular charateristic: Aquiferous System The aquiferous system is a particular system of vessels that forms the basis for locomotion, the grip on the substrate, the capture of prey and to the respiration of Echinodermata It is based on the principle of osmosis