A video claims to show a black, blob-like organism known as a marine flatworm clambering around on a small crab. The poster suggested that the relationship between the two marine animals was that of a “symbiote' — but that's not entirely true.
Polyclad flatworms are small organisms that normally grow to no more than 4 inches in length and described by the citizen science platformas having a “flattened, roughly oval, body shape and, in many cases, a pair of short tentacles on the head. Polyclads have what’s known as a folded pharynx, which is an elongated intestine in the center underside of their body that allows them to swallow prey whole,” reports.
“Since the video is short, I’m not positive that this worm definitely was eating that crab, but it is possible – they basically can evert their pharynx and swallow prey whole, and then later spit out what isn’t digestible. Polyclads have been known to follow snail slime trails back to a snail and eat it, so this worm could’ve been pursuing that crab once it first came in contact with it.”
Marine Flatworm with Crab Prey. www.youtube.com, https://www.youtube.com/watch?v=Y7ZBu4aQBwg. Accessed 27 July 2022. Parking, Directions &. and 379-8000. “Alison Young.” California Academy of Sciences, https://www.calacademy.org/staff/ibss/citizen-science/alison-young. Accessed 27 July 2022.
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