San salvador bivalves




Дата канвертавання25.04.2016
Памер3.54 Kb.
SAN  SALVADOR  BIVALVES

 

Family Ostreidae (Triassic to Holocene) - the oysters are filter-feeding, epifaunal, hard substrate encrusters that sometimes form reefs.  They occupy tropical to temperate estuarine and shallow-water marine settings.



 







Dendostrea frons (Lamarck, 1819) - exterior (top) & interior (middle) & lateral view (bottom) of a left valve of the frond oyster, 5.9 cm across at its widest.  Frond oyster shells vary in shape, which is dictated by the nature of the encrusted substrate - usually gorgonians ("soft corals").  This individual had encrusted an upright gorgonian.  The three coiled structures on the shell's exterior are encrusting worm tubes.


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