radial symmetry is the type of symmetry that a sea star has.
radial symmetry is the type of symmetry that a sea star has.
what type of symmetry does a sea star have?
radial symmetry
there are three main characteristics that all echinoderms share. when mature, echinoderms have a pentamerous radial symmetry. while this can easily be seen in a sea star or brittle star, in the sea cucumber it is less distinct and seen in their five primary tentacles. the pentamerous radial symmetry can also be seen in their five ambulacral canals. the ambulacral canals are used in their water vascular system which is another characteristic that binds this phylum together.
sea cucumber
list of echinoderms of ireland









































there are 75 species of echinoderm (phylum echinodermata) recorded in ireland.









































section::::class asteroidea (sea stars).









































section::::class asteroidea (sea stars).:order forcipulatida.









































section::::class asteroidea (sea stars).:order forcipulatida.:family asteriidae.









































bullet::::- "asterias rubens" (common sea star)









































bullet::::- "leptasterias muelleri" (northern sea star)









































bullet::::- "marthasterias glacialis" (spiny sea star)









































bullet::::- "stichastrella rosea"









































section::::class asteroidea (sea stars).:order paxillosida.









































section::::class asteroidea (sea stars).:order paxillosida.:family astropectinidae.









































bullet::::- "astropecten irregularis" (sand sea star)









































section::::class asteroidea (sea stars).:order paxillosida.:family luidiidae.









































bullet::::- "luidia ciliaris" (seven-armed sea star)









































bullet::::- "luidia sarsi"









































section::::class asteroidea (sea stars).:order spinulosida.









































section::::class asteroidea (sea stars).:order spinulosida.:family echinasteridae.
list of echinoderms of ireland