An interpretation of morphometric and gravimetric differences shown by adult Steganacarus magnus (Acari: Cryptostigmata)



The weights and lengths of about a thousand individuals of Steganacarus magnus (Nic.) have been analysed and found to have a bimodal distribution. It is suggested that this can be used as an aid to separating the sexes in this species.


An analysis of the weight distributions of adult Steganacarus magnus (Nic.) showed them to be bimodal. Small individuals, without eggs and pre-larvae had a mean weight of 159 μg and large individuals with eggs and pre-larvae had a mean weight of 335 μg. It is suggested that these two weight classes represent male and female individuals.