A bristleworm (Polychaeta sp.) off the coast of Boca Raton, Florida, USA
by Bryant Turffs
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King ragworm (Alitta virens) in the White Sea, Russia
Alexander Semenov
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14/09/23 - Syllidae sp.
14/09/23 - Annelida sp.
14/09/23 - Unidentified
14/09/23 - Annelida sp.
14/09/23 - Unidentified
14/09/23 - Annelida sp.
Marine worms collected from tidepools
14/09/23
QLD:CQC - Yeppoon, tidepools
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flickr
Alitta virens by Alexander Semenov
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hello hello, just wanted to ask, what do you think abt the osedax, bone eating worms? they're pretty cool in my opinion!! :D
Osedax or Bone-Eating Worms
Also known as zombie worms, these polychaetes do, in fact, eat bone! They don't have a mouth or stomach, but have a symbiotic relationship with a species of bacteria that breaks down the bone into something the worms can absorb. This process happens relatively quickly- a whale whale skeleton can be eaten by these tiny guys in about a decade!
And all the worms you see in that photo? They're female! The male individuals are microscopic and live inside of the female. Research has found as many as 111 males living in a single female.
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Alitta virens by Alexander Semenov https://flic.kr/p/2ocVyhA
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Diagram of a polychaete worm
Stefano Andrea Renier (1759-1830) Osservazioni postume di zoologia Adriatica
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This is Aphrodita aculeata, also known as the sea mouse! It is a species of bristle worm that possesses brilliantly bright hair-like structures known as setae. Unlike mammalian hairs (which are made of keratin), setae are composed of chitin. These setae are actually hollow tubes composed of hexagonal cylinders; the structure of the setae allows for their spines to reflect visible light with a reflectivity of 100% to the human eye. This is why it appears so vividly kaleidoscopic. The scales covering its back are its elytra which are not actually morphologically equivalent or even related to the elytra possessed by beetles.
They typically grow between 10-20 centimetres long, and their main diet consists of other annelid worms and crabs. They were noted by researchers to devour prey up to three times its size head first: Gunnar Thorson was quoted as saying that it was similar "to a hedgehog swallowing a snake". They were also noted to only feed when their head was underneath the sand (its preferred state of being), and it would only eat at night.
Unlike many other bristle worms, the sea mouse moves itself forward in a "fast stepping pattern" instead of a more undulating motion.
Its setae have a potential use in the manufacturing of nanowires due to the same properties that produces their iridescence.
Edibility: 6/10 - Not toxic, but covered in slime and dirt.
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Tomopteris sp. by Alexander Semenov
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Polychaete epitoke with egg mass
http://cifonauta.cebimar.usp.br/media/9119/
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her name is Jenny…
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Alitta virens by Alexander Semenov
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Alitta virens flying X1DII by Alexander Semenov
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Nov 4th, 2022
As an example of how different my job projects are, here are pictures from something I had never did before: samples of encrusting fauna! They basically left a tile board on a rocky shore for a set time and then removed it for analysis. Hey, I'm used to identify polychaetas but now I'd have to identify barnacles!
But, as it's always a surprise, in this type of sample I was able to re-encounter with my old acquaintances, Syllidae and Boccardia, who I haven't seen since my college internship! (they are both polychaetas, but look at them, look how cute they are 🥺)
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