Table 2. Characteristics and sex ratio of the four classes of the young series.

Class	Shell length interval (mm)	# of specimens	# of females	# of males
1	1–3	10	5	5
2	5–6	13	8	5
3	9–15	5	3	2
4	18–20	16	8	8

Sex of the specimens was assigned after the qPCR experiments, based on the absence/presence of a M mtDNA signal (absence: female, presence: male; see text for details).