Abstract

SUMMARYA cytological analysis of the thelytokous species Psychoda parthenogenetica has been made. A 3 n=15 complement and a type of apomictic thelytoky have been found. Apart from the triploidy, the complement of P. parthenogenetica is very similar to the one of P. alternata and P. cinerea. The phylogenetic interrelationships with the related bisexual species P. severini and the origins both of the thelytoky and triploidy have been discussed.

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