Morphological analysis

All cephalopods collected from stomach contents were partly digested and lost parts of the arms and suckers. However, some were sufficiently preserved to allow some measurements and counts. Octopuses had their total weight (TW), total length (TL) dorsal mantle length (DML, measured from the posterior end to the midpoint between the eyes), mantle width (MW), funnel length (FL) free funnel length (FFL), the length (AL) and width (AW) of some arms and in males the hectocotylus (Hc), ligula length (LL) and calamus length (CL) were measured. In some cases, the diameter and number of intraovaric oocytes, the number and length of spermatophores and the number of gill lamellae could be measured or counted. All measurements were carried out following Roper and Voss⁷⁷ and indices were expressed as quotients relative to the mantle length except for the free funnel index (FFI = FFL/FL) and the calamus index (CL/LL). Males with a fully developed hectocotylus and/or fully developed spermatophores in their spermatophoric sac and females with developed oviducal glands and/or developing oocytes in their ovaries were considered as mature for description purposes.