83 



IC 



c. 



'^ 



Figure 55 (contd.) 



larger. Both valves are compact. Sculpture on the shell is indistinct. The 

 provincular margin of C. / niponensis bears five rectangular denticles. The 

 central part of the provinculum lacks teeth; the length here is almost equal to 

 the marginal areas bearing teeth (Figure 55). The margin of the shell is edged 

 with a moderately wide, distinct band. 



Ecology 



In Peter the Great Bay, larvae of this scallop are found from the end of 

 June to early August at a water temperature of 15-20°C. Larvae settled in mid- 

 July. 



Kulikov, Medvedeva and Guida (1981) describe the structure of the shell 

 and of live larvae of this scallop. They present the characters that differentiate 

 the larvae of this species from those of Mizuhopecten yessoensis and Swiftopecten 

 swifti. 



