ANATOMY AND SYSTEMATICS OF CARDIOLUC1NA 



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Fig. 8 Cardiolucina civica from Andaman Islands. Large specimen illustrated by Melvill and Sykes ( 1 897, fig. 1 ) as Lucina (Codakia) semperiana Issel 

 (BMNH 1898.4.30.7) a. Right valve exterior; b. Left valve interior. Scale bar a-b = 1.0mm. 



cardinal large and the anterior very small. There is a single anterior 

 lateral tooth. Ligament short, extending from the beak to about half 

 way to posterior lateral tooth. Inner margin of shell thickened and 

 with 30 crenulations. Small denticles on anterodorsal margin. Ante- 

 rior adductor muscle scar elongate and not buttressed, pallial line 

 attached near ventral tip. Posterior adductor scar small and rounded. 

 Pallial line continuous. Shell grey white. 



Juveniles less inflated and more extended anteriorly. Posterior 



sulcus more pronounced and anterodorsal shell margin markedly 

 convex. Shell thinner with radial riblets visible from interior of shell. 

 A large specimen (BMNH 1898.4.30.7) from the Andaman 

 Islands, figured by Melvill and Sykes (1898 pi. 3, fig.l) as Lucina 

 (Codakia) semperiana, has many of the characters of C. civica, 

 although larger than specimens from other localities. Other speci- 

 mens in the BMNH from Port Blair. Andamans are similarly 

 large. 



Fig. 9 Geographical distribution of Cardiolucina civica (Yokoyama). 



