You have 0 product(s) in your cart.
TOTAL
AU$ 0.00
ECHINODERMS
General
- Greek “Echinos” meaning “spiny” and “dermos” meaning “skin"
- Approximately 7,000 species
- Includes starfish, sea urchins, sand dollars, sea cucumbers, sea lillies
Distribution
- Exclusively marine animals, no freshwater
Habitat
- Benthic animals
- Found usually on the sea floor in every marine habitat from the intertidal zone to ocean depths
Body
- They are triploblastic.
- Larval form show bilateral symmetry and adult forms show radial symmetry
- Body is unsegmented without a head
- The body is uniquely shaped. It can be star like, elongated or spherical
Reproduction
- Sexes are separate, Echinoderms are either male or female
- Become sexually mature after about two to three years
- Most release their eggs and sperm into the water where they are fertilized externally
- A female can release one hundred million eggs at once
Divided into:
Subphylum: Asterozoa
Class Asteroidea Sea Stars & starfishes
Class Ophiuroidea Brittle Stars
Subphylum: Crinozoa
Class Crinoidea Sea Lilies & Feather Stars
Subphylum: Echinozoa
Class Echinoidea Sea Urchins and Sand Dollar
Class Holothuroidea Sea Cucumbers
SUBPHYLYUM: ASTEROZOA
CLASS: ASTEROIDEA
Scientific Name: Asterias amurensis (Lütken, 1871)
Common Name: Northern Pacific Sea Star
Photo by Paul Sorensen. Victoria, Mornington Pier, 2009. Introduced species.
Scientific Name: Coscinasterias muricata (Verrill, 1867)
Common Name: Eleven Arm Seastar
Photo by Paul Sorensen. Victoria, Blairgowrie Pier, 2013.
Scientific Name: Uniophora granifera (Lamarck, 1816)
Common Name: Granular Sea Star
Photo by Paul Sorensen. Victoria, Mornington Pier, October 2020.
Photo by Paul Sorensen. Victoria, Blairgowrie Pier, February 2020.
Scientific Name: Echinaster luzonicus (Gray, 1840)
Common Name: Luzon Sea Star
Photo by Paul Sorensen. Philippines, Puerto Galera, October 2018.
Scientific Name: Petricia vernicina (Lamarck, 1816)
Common Name: Velvet Sea Star
.jpg "Velvet Sea Star")
Photo by Paul Sorensen. Victoria, Mornington Pier, October 2009.
.jpg "Velvet Sea Star")
Photo by Paul Sorensen. Victoria, Ricketts Point, November 2020
.jpg "Velvet Sea Star")
Photo by Paul Sorensen. Victoria, Ricketts Point, November 2020.
Scientific Name: Nectria ocellata Perrier, 1925
Common Name: Spotted Sea Star
Photo by Paul Sorensen. Victoria, Point Lonsdale, June 2020.
Scientific Name: Nectria ocellata Perrier, 1925
Common Name: Spotted Sea Star
Photo by Paul Sorensen. South Australia, Rapid Bay, March 2022.
Scientific Name: Leiaster sp.
Common Name: Velvety Sea Stars
Photo by Paul Sorensen. Queensland, Lady Musgrave Island, October 2007.
Scientific Name: Linckia laevigata (Linnaeus, 1758)
Common Name: Blue Linckia
Photo by Paul Sorensen. Philippines, Dauin, September 2016.
SUBPHYLYUM: ECHINOZOA
CLASS: ECHINOIDEA
Scientific Name: Phyllacanthus irregulatis (Mortensen, 1928)
Common Name: Club-spined Sea Urchin
.JPG)
Photo by Paul Sorensen. South Australia, Rapid Bay 2022.
SUBPHYLYUM: ECHINOZOA
CLASS: HOLOTHUROIDEA
Scientific Name: Australostichopus mollis (Hutton, 1872)
Common Name: Australasian Brown Sea Cucumber
Photo by Paul Sorensen. Victoria, Blairgowrie Pier 2022.
Scientific Name: Paracaudina bacillis (O’Loughlin & Barmos, 2011)
Common Name: Sea Cucumber
Photo by Paul Sorensen. Victoria, Blairgowrie Pier 2021.
