https://doi.org/10.1371/journal.pone.0241066, Editor: Johann Mourier, Institut de recherche pour le developpement, FRANCE, Received: May 9, 2020; Accepted: October 8, 2020; Published: November 11, 2020. One ROV had two additional lighting booms with variable and independent lighting controls. To ensure accuracy, measurements were taken when the squid were as perpendicular as possible to the camera’s line of sight. Consistent with previous anatomical studies of Magnapinna, standard measurements included dorsal mantle length (DML, taken from the anterior mantle edge to the posterior junction of the fins), mantle width (MW), fin length (FL), fin width (FW), total arm length, and DML:FL [8,16,27]. im Zoologischen Museum Kiel seit Mai 2012 ausgestellt. These squid are assumed to be “fishing”, with some Mastioteuthis squid capturing small plankters with minute, sticky suckers [44]. Die erste Video-Aufnahme eines "Langarm-Kalmars" wurde 1988 vor der brasilianischen Küste gemacht. 2001. Allerdings war es in schlechtem Zustand und so konnte nur wenig Information aus dem Fang gezogen werden, so dass die Art zunächst als Mastigoteuthis talismani der Familie Mastigoteuthidae zugeordnet wurde. As the squid moved toward the camera in a horizontal swimming position, the dorsal mantle and proximal arms/tentacles appeared a dark orange-brown, with the fins and head slightly lighter (Fig 7B). 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. The squid has large, elastic arms and tentacles and is about the same size. These numbers are suggestive of a higher than average rate of Magnapinna squid sightings in the GAB region, however should be interpreted with caution given the likelihood of variabilities in survey methods (e.g. One arm/tentacle lacked a distal filament. sightings reinforces the value of imagery as a tool in deep-sea squid research, and add to our knowledge of this elusive and intriguing genus. Where found, video hours are a common metric of unit effort, with 5 Magnapinna squid sighted in 75 hours of this study compared to 1 in 280 hours [14,30], 1 in 100 hours [18,31], 2 in 80 hours (not confirmed as individuals) [18,32], and 1 in 57 hours [19,33]. A third Magnapinna sp. (C) Dorsal view showing a pale pink-brown mantle and light brown proximal arms/tentacles. Description: Big fin squid are a group of rarely seen cephalopods with a distinctive morphology. B (95 mm ML) Scientific classification Kingdom: Animalia Benthic habitat was similar to the first sighting, consisting of flat, fine, light coloured ooze with overlay of possible biological origin (not gravel) and Lebensspuren (including mounds and seastar imprints). Specimen of Magnapinna sp. There was no apparent reaction to the towed camera as it passed quickly over the squid at an altitude of 2.3 m. A small Magnapinna squid (62 mm DML) was seen in a horizontal position, parallel to and just above the seafloor. Total survey time was 15.81 hrs, covering 46 km of linear transects, and approximating 218 km2 based on an average field of view width of 4.75 m [23]. Die Familie Magnapinnidae mit der einzigen Gattung Magnapinna innerhalb der Ordnung der Kalmare enthält seltene Arten mit einer sehr speziellen Morphologie.Bis vor kurzem waren nur Larven bekannt, larvenähnliche Exemplare und Jungtiere, anhand derer die Familie wissenschaftlich beschrieben wurde. Grid transects were undertaken at each site, followed by subsequent specimen collections within the grids. Außerdem sind ihre Flossen enorm groß. 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. The ROV sightings spanned 25 hours but were within 300 m of each other. Observations of Magnapinna sp. In response to previous Magnapinna sp. No, Is the Subject Area "Swimming" applicable to this article? Five video observations of Magnapinna sp. Competing interests: The authors have declared that no competing interests exist. Yes seen in our study would have been annotated as “Cephalopods: Squid”. Writing – review & editing, Roles Close. Submarine canyons and similar incised features often support high productivity and diversity in the deep-sea, and these locations may reflect habitat preference of Magnapinna sp. 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