Study discovers origins of cryptic markings in Aotearoa New Zealand's deep sea

While studying footage from a 2013 Chatham Rise survey, researchers kept seeing horseshoe-shaped imprints in the seabed but had no idea what they were or why they were there.

"Sadie sent me a bunch of images from the survey and asked whether they had been caused by a deep-sea rattail, also known as a grenadier. To investigate this theory, Stevens overlaid head profile images of specific rattails with images showing clearly defined seabed impressions."The reason we could point to a specific species is because of their unique head features—these types of rattails have a long snout and an extendable mouth on the underside of their head that allow them to feed off the seafloor, something that other species do not," said Stevens.

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