The benthic marine bivalve, , is a commercially caught species and is exploited in many southern coastal cities of China, where it is sold by wet weight. However, efficient and effective management strategies are needed for a sustainable supply of this wild resource, and an understanding of reproductive biology and the fishery is required. The aim of this study was:(1) characterize gonadal morphology and histology; (2) describe the main gametogenic events and link them to maturation stage, and (3) characterize spawning, eggs, and newly hatched veliger larvae. Samples were collected monthly from January 2012 to January 2013 from Cangnan Bay, south of Zhejiang Province, China. Routine histological techniques were used to characterize the gonadal development stages. The results show that the clam is characterized by typical gonadal development of bivalves, and the reproductive cycle was divided into proliferation, growing, maturation, breeding, and suspensive stages. Gonadal maturation of clams from the South Zhejiang coast was completed over 1 year. The spawning season occurred from early June to mid-September, and peak spawning occurred from early July to mid-August, when water temperature was 24.8-29.4℃. This clam is dioecious, and gametes of both sexes are released at about the same time. The female to male ratio was 1:1. Spawning was induced by shade-drying or running seawater. Embryos developed in salinity of 28 and temperature of 29℃. The D-shaped larvae hatched after 16-20 hours at 29℃. The larvae developed into post-larvae and completed metamorphosis into spat after 5-6 days, with a mean shell length of 200 μm.