Their larvae are up to 6 mm long, white, slender and legless, with a black head and smooth semi-transparent skin which reveals the contents of the digestive tract.

In the formation sperms of males the 1st spermatocystic division is monocentric mitosis, the maternal and paternal homologous chromosomes are separated.

In the formation ova of the females the 1st ovarian division is monocentric mitosis, the maternal and paternal homologous chromosomes are separated.

During early cleavage stages of the embryo limited chromosomes are eliminated.

Hence male soma line cells have 3 pairs of autosomes and one maternal X chromosome.

Hence female soma line cells have 3 pairs of autosomes and one maternal and one paternal X chromosome.