 The degree of sexual dimorphism in this species is very high, with females growing to two meters in length, whereas males, the first live specimen of which was seen off the Great Barrier Reef in 2002, grow to about 2.4 cm.Individual weights of males and females differ by a factor of about 10,000.Males and small females of less than 7 cm have been reported to carry with them the tentacles of the Portuguese man o' war.