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#molluscs

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Jon Sullivan

#BiologicalInvasions expert Prof. Franz Essl from Austria gave a seminar today at #LincolnUniversityNZ. He showed a study of the global distribution of slugs and snails. Natives show distinct biogeographic regions. Australasian snails were different from African snails which were different from South American snails. Yet, naturalised snails (moved around the world by people) were just temperate and tropical. We are dramatically simplifying the natural world by moving species about. #molluscs

A photo of a bearded man, Prof. Franz Essl, and a presentation slide showing a map of the distinct communities of slugs and snails around the world. On the left are the native molluscs and the world is divided into many biogeographic regions. On the right are the naturalised (invasive) snails, and there's just a temperate and a tropic community.
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Jon Sullivan

@mads The animal that most blew my mind when I found out about it was the sea swallow.

I'm not sure how I'd not heard about these before.

Just look at it!

They float upside-down under the surface of the open ocean, scooting about looking for food. They eat things like Portuguese man o' war and steal the stinging nematocysts to use for their own defense.

And, they're just crazy-levels of elegant.

inaturalist.org/observations/2

iNaturalistSea Swallow (Glaucus atlanticus)Sea Swallow from Henderson Bay on February 11, 2016 by tangatawhenua. Is it a fish? Is it a slug? Is it a fishy anemone? I do not have a clue what this is! It is ab...
#SeaSwallow#molluscs#nudibranch
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Lukas VFN 🇪🇺

What a #mollusc shell and fiber optic cables have in common npr.org/2024/11/23/nx-s1-51996

Heart cockle shells transmit sunlight to photosymbiotic algae using bundled fiber optic cables and condensing lenses: Dakota McCoy et al. nature.com/articles/s41467-024

"the structure of the #HeartCockle's shell operates as its own kind of fiber #OpticCables to channel light to the #algae living inside it"

photos of various bivalve sea shells and a drawing showing them placed on the sea floor
#protists#symbiosis#mollusks
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Heliograph

@alcootatooter no no no that was superhelpful ☺️ I really had no idea those #oceans creatures exist!! When I sat down after visiting the beach looking at those pretty tiny pieces, they were all around the washed up lobsters, and googling the images did not return anything, so I made an assumption and am very happy to learn what they actually are!! ☺️ Now I will look out for the whole #mollusc :D they washed up on the beach with a flood of bluebottles, and seeing these #marine #molluscs are from QLD I guess the warmer water might have brought them along...

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Jon Sullivan

It’s not every day that you see the phrase “Gummy squirrel with parasitic snail attached”, yet, here it is, on #RadioNewZealand.

Turns out a “gummy squirrel” is “a weird sea cucumber with a large sail-like extension” and this one was found on a recent deep sea expedition to the Bounty Trough “one of the world’s least explored deep-ocean ecosystems”.

It’s an interesting article about lots of new discoveries.

rnz.co.nz/national/programmes/

A screenshot of part of an RNZ story about deep sea discoveries, including this gelatinous purplish red sea cucumber with a snail and a small yellowish parasitic snail on it. The photo is by Thom Linley.
#biodiversity#NZ#marine
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