Redescription of the flapjack octopod, Opisthoteuthis bruuni (Cephalopoda: Opisthoteuthidae) from the southeastern Pacific Ocean and evolutionary relationships of cirrate octopods M. Cecilia Pardo-Gandarillas1*, Mariana Díaz-Santana-Iturrios2, Mark Fenwick3, Roger Villanueva4, Christian M. Ibáñez2 1.- Departamento de Ciencias Ecológicas, Facultad de Ciencias, Universidad de Chile, Las Palmeras 3425, Ñuñoa, Santiago, Chile. 2.- Departamento de Ecología y Biodiversidad, Facultad de Ciencias de la Vida, Universidad Andres Bello, Avenida República 440, Santiago, Chile. 3.- National Institute of Water and Atmospheric Research, Ltd., Wellington, New Zealand. 4.- Institut de Ciències del Mar (CSIC), Passeig Maritim de la Barceloneta 37-49, 08003-Barcelona, Spain. Morphology and phylogeny of Opisthoteuthis bruuni *Corresponding author:
[email protected] CONFLICT OF INTEREST STATEMENT: The authors declare that there is no conflict of interest. ABSTRACT Cirrate octopods are considered to resemble the ancestor of all octopuses. Cirrates inhabit the deep ocean and are characterized by the presence of fins, a cartilaginous inner shell and a single row of suckers alternating with pairs of cirri thus comprising uniserial suckers and biserial cirri. The objective of this contribution is to improve the taxonomy of Opisthoteuthis bruuni from the southeastern Pacific Ocean and suggest a new hypothesis of cirrate phylogeny. Given that the most complete molecular data set for cirrates available in public databases is comprised almost exclusively of 16S 1 rRNA gene sequences, we compared morphological and mitochondrial gene 16S rRNA data (generated in this study) from the genus Opisthoteuthis from the southeastern Pacific Ocean. Additionally, we sequenced Opisthoteuthis chathamensis, Opisthoteuthis mero and Luteuthis dentatus from the southwestern Pacific, as along with Cirroctopus mawsoni from Antarctic waters.