Table 1. Description of morphological measurements recorded.

Abbreviations	Description
MLd	Dorsal mantle length
MW	Greatest width of mantle
HW	Greatest width of head at the level of eyes
AW	Width of stoutest arm
SDn	Diameter of largest non-enlarged sucker on any arm
WD	Measurement of deepest web sector, from beak to midpoint of sector
ALL3/R3	Length from beak to tip of third left/right arm
SDeL2/R2*	Largest enlarged sucker diameter on the second left/right arm
SDeL3/R3*	Largest enlarged sucker diameter on the third left/right arm
SCL3/R3	Entire number of suckers along intact third left/right arm
LL*	Length from distal most sucker to tip of hectocotylised arm
CL*	Length from distal most sucker to tip of calamus
TOL*	Length of male terminal organ

* Denotes morphological trait only recorded for male octopuses.