The morphology of larval development and some aspects of oogenesis are described inMicromaldanespp. from eastern Australia. All four species breed throughout the year, and in all the oocytes are released into the coelom prior to vitellogenesis.Micromaldane androgyne, M. pamelaeandM. rubrospermathecaall have solitary oogenesis, whileMicromaldane nutriculahas “nurse” cells attached to the oocytes throughout vitellogenesis. Mature females ofMicromaldane nutriculabrood up to two groups of 1–4 directly developing larvae at a time. Newly fertilized eggs are ellipsoidal, 150x350 μm. No ciliation is visible during development. Larvae leave the tube after developing 12 chaetigers. AllMicromaldane androgyneadults brood a single batch of two or three directly developing larvae at a time. Newly deposited eggs are 1 mm long and 150 μm in diameter. No ciliation is visible on the larvae during development. Larvae develop 19 chaetigers before leaving the tube.Mature females of Micromaldane pamelaebrood single batches of up to 31 larvae at a time. Mature oocytes are ellipsoidal 300 X 150 μm. Larvae show a distinct neurotroch in early stages of development, but this is resorbed as chaetigers are formed. Larvae probably leave the tube at the 16-chaetiger stage.