Sea star dissection
Left: dorsal (aboral) surface; Right: ventral (oral) surface.
Dorsal body wall removed.
Dorsal body wall removed and pyloric caecum laid to side.
Other Echinoderms
Sea Urchin Test (shell)- dorsal view
Note the pentaradial symmetry evident in the distribution of bumps where the spines were attached and the distribution of holes where the tube feet came through.
Sand Dollar Test (shell)- dorsal view
Note that this animal has the pentaradial symmetry of its lineage evident in the 5-petalled, flower-like pattern of holes where tube feet emerged.
IRL
(in real life)...
Leather Star (Dermasterias imbricata) -ventral surface
6C field trip to Pillar Point - Photo by: Hanh
Another Leather Star (Dermasterias imbricata) held by Dikaios
6C field trip to Pillar Point
Purple Sea Urchins (Strongylocentrotus purpuratus) in a Pillar Point tide pool, along with sea anemones and coralline algae.
El Granada, CA (San Mateo County)
Photo by: Phuong Vu