2.  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

3. 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

4. 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

5. 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!

6. 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