Morphological description and mitochondrial DNA-based phylogenetic placement of a new species of Callistoctopus Taki, 1964 (Cephalopoda, Octopodidae) from the southeast waters of China

Callistoctopus xiaohongxu sp. nov A reproductive system of male, 56.3 mm ML (OUC-201812050303) B spermatophore, male, 56.3 mm ML (OUC-201812050303) mm C reproductive system of female, 51.7 mm ML (OUC-201812050305) D egg cluster, female, 51.7 mm ML (OUC-201812050305) E single egg female, 51.7 mm ML (OUC-201812050305). Abbreviations: ag, accessory gland; cb, cement body; do, distal oviduct; ea, ejaculatory apparatus; o, ovary; og, oviducal gland; sg, spermatophore gland; sr, sperm reservoir; ss, spermatophore storage sac; t, testis; tf, terminal filament; to, terminal organ; vd, vas deferens. Scale bars: 10 mm.