Archerd Shell Collection > Shell Classes > Bivalvia > Spondylidae


Family: Spondylidae (Thorny Oysters)


Description

Despite the similar common name, the thorny oyster molllusc is more closely related to the scallop. Like scallops and file clams, they have a well developed middle mantle that carries sensory tentacles with multiple eyes around the shell edges. Reflecting this rich endowment of sensory receptors, their cerebral and visceral ganglia have become much more concentrated, in the visceral region, and they show distinct optic lobes with nerve trunks to the mantle edges (Morton, 1960). 
 
However, in common with the true oysters, thorny oysters live cemented to shells or other substrates as epifaunal species, rather than living attached by a byssus. Their  key shell characteristic is a ball & socket type hinge, rather than the more common toothed hinge of bivalves.

Classification  
Class: Bivalvia
Subclass: Pteriomorpha
Order: Pterioida
Suborder: Ostreina
Family: Spondylidae
 
Single Genus: Spondylus

Spondylus wrightianus (Crosse, 1872)
Wright's Thorny Oyster
13.6 cm, spine-to-spine

 

Spondylus japonicus (Amano & Marui, 1958)
Japanese Spiny Oyster

  SEE MORE THORNY OYSTERS:

Spondylus princeps
Pacific Thorny Oyster


LINK- LIVE THORNY OYSTER

Spondylus varius
Thorny Oyster

 


Archerd Shell Collection > Shell Classes > Bivalves > Thorny Oysters