About a couple of Thysanoteuthis rhombus (Cephalopoda, Thysanoteuthidae) found in the Strait of Messina (Sicily)

The capture of two large specimens of Thysanoteuthis rhombus in the waters of the Straits of Messina (Sicily) is reported. Body measurements and data on reproductive biology are given. T. rhombus seems unique among squids by its monogamy, where pairs consisting of male and female of the same size remain together from their juvenile stage until death (probably the main function of this paired lifestyle is reproductive).