Bryozoa : While not a dominant form or even a readily observed form of 

 life, the bryozoa are another type of indicator organism. These are usually 

 encrusting forms with rather delicate structures found growing on rocky 

 substrate, shells of organisms, and other hard surfaces. 



Table 



7. Bryozoans at Rincon Island 



Common Name 



Scientific Name 



Moss animal 



Buguta sp. 



Moss animal 



Diaperoeaia aalifovnica (d'Orbigny) 



Moss animal 



Membranipora membraruiaea (Linnaeus) 



Moss animal 



Memhranipora savarti (Audouin) 



Moss animal 



Membranipora tviberouldta (Bose) 



Lace moss animal 



Phidolopora paaifioa [Robertson) 



Moss animal 



Smittina sp. 



Moss animal 



Thalamorporella oaliformioa (Levinson) 



Echinodermata : The echinoderms are one of the most noticeable forms of 

 life on the island and a good cross-section of this phylum is now to be 

 found in the intertidal zone. Four of the five major classes are repre- 

 sented. The class Asteroidea is more widely represented than any other , 

 with seven species present. The following echinoderms have been collected 

 at Rincon Island: 



Table 8. 



Echinoderms at Rincon Island 



Common Name 



Scientific Name 



Sand starfish 



Astropeoten armatus Gray 



Sea cucumber 



Cuaumaria sp. 



Leather star 



Dermasterias imbriaata (Grube) 



Yellow sea cucumber 



Eupentaata quinquesemita (Selenka) 



Brittle star 



Ophiothrix spioulata LeConte 



Brittle star 



Ophiopteris papillosa (Lyman) 



Red-brown sea cucumber 



Parastichopus califovniaus (Stimpson) 



Sea cucumber 



Parastiahopus parvimensis (Clark) 



Bat star 



Patiria miniata (Brandt) 



Short-spined starfish 



Pisaster brevispinus (Stimpson) 



Giant starfish 



Pisaster giganteus (Stimpson) 



Common starfish 



Pisaster oahraceus (Brandt) 



Sunburst starfish 



Solas ter dawsoni Verrill 



Red sea urchin 



Strongytocentrotus franaisoanus (Agassiz) 



Purple sea urchin 



Strongylooentrotus purpuratus (Stimpson) 



Chordata : This group of animals contains a diversity in size from the gray 

 whale down to the tiny sea squirts and provides some of the more interesting 

 forms around the island. The simple tunicates, the numerous kinds of fishes, 

 birds, and marine mammals compose this phylum. The construction of this 

 island has made possible the diversity of chordates now found in the area. 

 This diversity of life again emphasizes the maturity of the reef and the 

 ecological enhancement provided by this structure. 



68 



