I found this one orange juvenile Tylomelania snail in my aquarium on January 23, 2014.
Other snails in my aquarium are as follows: many Gyraulus crista, many Bithynia tentaculata, one Neritina pulligera, one adult orange Tylomelania. Therefore I know, that the one adult Tylomelania is a female. It is good to know, because the gender of Tylomelania snails can be usually identified according to the snail size. Females are larger.