This species births fully developed juveniles where, in brooding adults, all stages of development occur simultaneously in utero, from newly fertilized ova to large (5 mm), fully shelled juveniles. Prezant et al. (2006) found that water-borne cues from a predatory crayfish (Orconectes llimosus) induced a doubling of the number of offspring released and these newly born snails were generally smaller, though more variable in size, and possessed a greater shell organic content than control individuals (likely response to the predator).
TTGTATATTTTATTTGGTATGTGGTCAGGGTTGGTTGGTACTGGATTA---AGAATTTTAATTCGAATTGAGCTTGGTCAACCTGGTACTTTATTAGGAGAC---GATCAGTTATATAATGTAATTGTAACTGCTCATGCATTTGTTATAATTTTCTTTATAGTTATGCCTATAATAATTGGTGGATTTGGAAATTGATTAATTCCTTTAATA---TTAGGTGCTCCTGATATAGCTTTTCCTCGTTTAAATAACATAAGTTTCTGATTATTACCCCCTAGGTTGTTACTTCTTTTATCTTCAGCTGCTATTGAAAGGGGGGTTGGAACCGGTTGAACAGTGTATCCTCCTTTAGCTGGAAATTTAGCACATACTGGTGGATCAGTTGATTTA---GCTATTTTTTCATTACACTTGGCTGGTGCGTCTTCTATTTTAGGGGCTGTTAATTTTATTACTACTGTAATTAATATGCGTTGATGTGGTATGCAATTTGAACGATTATCATTATTTGTATGATCTGTAAAAATTACTGCTATTTTACTTTTATTGTCTTTACCAGTGTTGGCAGGA---GCAATTACTATATTATTGACTGATCGAAATTTTAATACGTCTTTTTCTGATCCTGCTGGA -- end --
This species is widely distributed in China (including Heilongjiang, Jilin, Liaoning, Neimenggu, Xinjiang, Ningxia, Shanxi, Hebei, Henan, Shandong, Anhui, Jiangsu, Zhejiang, Jiangxi, Hubei, Hunan, Fujian, Taiwan, Guangdong, Guangxi, Sichuan and Yunnan), Myanmar, Thailand, Viet Nam, the Philippines, Indonesia (Java), People's Republic of Korea and Japan (Liu et al. 1979, Indiana Department of Natural Resources 2005). Introduced widely in northern America.