The Eastern Atlantic observations were of similar close spatiotemporal proximity to those of the GAB, but could not be distinguished as individual Magnapinna squid, as opposed to multiple sightings of the same squid. Only seven arms/tentacles of the squid possessed distal filaments. Coiling of distal arm/tentacle filaments can be seen at their proximal ends. The squid has large, elastic arms and tentacles and is about the same size. https://doi.org/10.1371/journal.pone.0241066.t001, https://doi.org/10.1371/journal.pone.0241066.t002. Nearby were rough low rock outcrops overlayed by fine ooze sediment. Distal arm/tentacle filaments were not of a uniform length, ranging from approximately 536 mm to 1626 mm. This page is a collection of images that are attached to a branch of the Tree of Life. Vecchione, M., R. E. Young, A. Guerra, D. J. Lindsay, D. A. Clague, J. M. Bernhard, W. W. Sager, A. F. Gonzalez, F. J. Rocha & M. Segonzac. It may be that imagery of Magnapinna squid are present in already surveyed areas, both in Australia and around the world, but have not yet come to light due to lack of identification at the appropriate taxonomic scale. Image light levels have been adjusted for clarity, and distance between paired lasers seen on the seafloor is 100 mm. A Magnapinna squid was observed in the shadow of the towed camera system, just above the substrate with distal arm/tentacle filaments largely trailing parallel to the seafloor. A cosmopolitan distribution has been hypothesised, but to date only three sightings have been reported in the southern hemisphere [14,19,20]. It is not known whether the outcome would have differed with another observer, and to date there have been no published studies by specialised taxonomists based on imagery of deep-sea squid in Australia. CATAMI) and although these schemes annotate at a broad scale, they allow the opportunity for revisiting by specialised taxonomists [38,39]. Museums Victoria, Melbourne, Victoria, Australia, Roles The distal arm/tentacle filaments were only visible in the stills image: their length relative to DML could not be measured as their full length trailed outside the field of view, and a full count of arms/tentacles was not possible due to image quality. Archived . The video and still image have a blue-green cast so accurate colours descriptions were not possible, however, mantle and proximal arms/tentacles appear much darker than the fins and distal filaments. Funding: Funding for this research was provided through the Great Australian Bight Deepwater Marine Program, a CSIRO led research program sponsored by Chevron Australia, with data generated to be made publicly available. https://doi.org/10.1371/journal.pone.0241066.g004. The ROV was at an altitude of 4.6 m, and the squid was encountered well below the ROV in an oblique position, with its proximal arms/tentacles held slightly opened at angles ranging from approximately 10–75 degrees. Locomotive and behavioural components were observed, including a ‘raised arm’ posture, a horizontal example of the ‘elbow’ pose, and filament coiling, a behaviour never before seen in squids. While identification to species is not possible based solely on imagery, the morphology of the observed squids, with characteristic large fins and extremely long distal arm/tentacle filaments, clearly corresponds to the genus Magnapinna . Das erste Exemplar aus dieser Gattung war Magnapinna talismani und wurde 1907 bei den Azoren gefangen. During grid transects, the ROVs travelled at a speed of 2 knots and at an altitude of approximately 2–3 m above seafloor . https://doi.org/10.1371/journal.pone.0241066.g001. This horizontal ‘elbow’ pose is rarely seen; only previously reported by  in which the squid was observed mid-water. Recent video observations of deep-sea chiroteuthid squid have revealed similarities in behaviour: some mastigoteuthids orientate vertically and dangle long whip-like tentacles in a “tuning fork” pose, and some Chiroteuthis squid dangle long tentacles at sharp right angles to their arms [43–45]. Two Magnapinna squid (Sightings 3 and 4) exhibited a postural behaviour, in which a single arm/tentacle (without filament) was raised perpendicular to the anterior-posterior body axis while the squid moved upwards and into a horizontal posture. 214 points • 16 comments - Magnapinna squid waiting for its pray deep in the ocean. This video was taken by ROV on 25 March 2017 at a depth of approximately 3002 m. Blue boxes are present in the lower corners to mask embedded logos in accordance with publishing requirements. Die Familie Magnapinnidae mit der einzigen Gattung Magnapinna innerhalb der Ordnung der Kalmare enthält seltene Arten mit einer sehr speziellen Morphologie. The squid was missing three distal arm/tentacle filaments. The squid entered the camera’s field of view, swimming with rapid fin flapping in a largely horizontal to slightly oblique position. One of the most remarkable groups of deep-sea squids is the Magnapinnidae, known for their large fins and strikingly long arm and tentacle filaments. Search. Bathymetric contours are 100, 200, 400, 1000, 1500, 2000, 3000 and 5000 m. Inset shows the location of the study area in the GAB. The peculiarity and distinctiveness of Magnapinna squid has meant that even incidental sightings from hydrocarbon well operations have been reported, but such peculiarity does not guarantee that generalist annotators would recognise the interest in its reporting . A fourth Magnapinna sp. 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