Jorge I. Merchán M

Really cute, It looks like they have come across various of them

Orange sea pen inside a glass jar filled with seawater. With a small sea start hanging around

Sometimes you get to see animals you have never seen before and that's cool :) 🪸

Omg, definitely a flatworm and they picked it up. Looks like an acotylean to me

A flatworm, or is that a snail shell? Cute little blob. @schmidtocean.bsky.social dive 821 #MarDelPlataCanyon #MarineLife #conicet

Awesome, thanks! Not really sure but I'm so glad they picked it up

Oh there are many that are quite hard to spot, I miss many for sure even when I go out just to look for them

What is #InverteFest? It's a periodic event where we invite you to celebrate the overlooked invertebrate fauna around you and share the joys of discovery online. #InverteFest takes place every April, August, & December over the last 7 days of the month. Going out? 1. Find invertebrates 2. Share observations online using the hashtag #InverteFest 3. Interact with others who are celebrating the event NOT Going out? - Post your squid painting - Stream a game where you play as a crab with a knife - Selfie with your 27 beetle enamel pins - Write wikipedia pages Questions? ask franzanth / maureenbug / saimihanma More info and ideas on: invertefest.com

Greetings, chordate comrades. #InverteFest is upon us.

tl;dr: Over the last 7 days every April, August, and December, we invite you to show the internet your coolest bugs & slugs.

Go find critters, post your art, write wikipedia pages, do whatever you like to celebrate invertebrates with us!

Wow, do you have the link for this one? I'm curious about the worm looking thing

Ctenophore from @schmidtocean.bsky.social dive 819 #MarDelPlataCanyon #MarineLife

Some flatworms too, hiding in plain sight :)

That one is also a sea cucumber, you can tell by the lines which are its longitudinal muscles. They sometimes look like worms so good to spot those lines

Unmasking the Sea Star Killer After a decade of carnage, we finally know what’s devastating sea stars along North America’s West Coast. Does that mean scientists can save them?

Sea stars—26 species—have been dying by the billions from Mexico to Alaska, their arms tearing off, their bodies dissolving, w/huge consequences for the sea.

Experts finally figured out why— and gave @biographic.bsky.social exclusive access.

Can we save them? www.biographic.com/unmasking-th...

Foundations: please step up and take over the Biodiversity Heritage Library (BHL). This is an absolutely essential scanned archive of all of the old journals and books from the 1500s to about 1920. Has been indispensable for my research.
about.biodiversitylibrary.org/call-for-sup...

illustrations of four species of Physalia alongside original drawings and iNaturalist images. Maps of positively identified iNaturalist records show the distribution of each species.

My favorite outcome was validating species descriptions from 18th century scientists who illustrated animals on their voyages. Their descriptions were often rejected as implausible – we found that in many cases they were exactly right. Yet another reason why @biodivlibrary.bsky.social is so valuable

An episodic burst of massive genomic rearrangements and the origin of non-marine annelids - Nature Ecology & Evolution An analysis of annelid genomes reveals massive reshuffling of chromosomes in the ancestral lineage leading to clitellates, a clade composed of non-marine annelids, with potential implications for the ...

Glad to see this paper finally out! An episodic burst of massive genomic rearrangements and the origin of non-marine annelids
@natecoevo.nature.com @ibe-barcelona.bsky.social @csic.es @erc.europa.eu www.nature.com/articles/s41...

I think I haven't seen those videos before, cool channel!

YouTube video by 揭維邦 The attack predation stages of Ilyella gigas

Whoa. Did NOT know that flatworms could take crabs! #wormwednesday youtu.be/YE_tSKh8Sy0?...

YouTube video by 揭維邦 Try to attack nudibranch but fail by planocerid flatworms

OH FARK! Here's a freakin' FLATWORM attacking and devouring a NUDIBRANCH! Never seen that before! #molluscmonday #wormwednesday youtu.be/haOe9lQMKSo?...

A hypnotic flatworm flowing through the night

Among a dreamlike seascape of copepods and jellies, a rare heteropod (sea elephant)! Despite looking like the ghost a of a vengeful banana, with beady eyes and a long proboscis, they are a type of pelagic snail. Fin on its belly is its 'foot'.

I found it once, really beautiful nudi!

Purple urchin with smooth plates on top, blunt fringe around edge

spiny urchin with spines on spines

red urchin skeleton with white highlights

elongate spines with red/white bands on white center test

Stunning urchin tests by Anders Hallan via National Geographic www.facebook.com/natgeo/posts...

Oh I liked the genus Gecarcinus, time to learn a new one

"Dark" morph of what is still Gecarcinus ruricola (Linnaeus, 1758), the ‘black land crab’, western Caribbean, San Andrés Archipelago, Providence Island. After a long annual breeding migration from the damp and shaded forest areas, this ovigerous female, with a large pleon and pleopods bearing ripe eggs, lays its eggs in the sea. Credit: Gabriela Dominguez (MFA/ Filmmaker, bluelizardstudio.co).

"Red" morph of Gecarcinus ruricola in the field, opening its claws wide while standing on leaf litter, Cuba, Bay of Pigs. Photo: P. Lindgren (Creative Commons Attribution-Share Alike 4.0)

What is now Hartnollius lateralis (Fréminville in Guérin, 1832) n. comb., living in Guadeloupe, July 2015, on sand. Photo: J. Poupin

What is now Hartnollius quadratus (Saussure, 1853) n. comb. on a leaf on the forest floor in Corcovado National Park, Costa Rica. Photo by me!

Why taxonomy can't be replaced by 'AI':
The land crab genus Gecarcinus was just revised based on 26 morphological characters, some requiring dissection. Only an expert could do this! (Paper link next skeet)

It is now monotypic (1+2), the other 3 species referred to Hartnollius n. gen. (3+4) 🧪🦀

Concerning, I'm hoping they clarify what this means in a Forum post so we can better discuss it

Starfish found under a rock. It's coloration is red or purple in blotches over a white background

Not sure about the name of this one but it's a pretty good looking starfish.

There are always surprises under the rocks

Nemertea The eversible proboscis of the Nemertean can Create some consternation in the creatures in the sand Or rocky flats or cliffs or boulders, mud and seagrass too In many ocean habitats these weirdo worms make do They coil within their hidden homes, a tangled, slimy mass Just waiting for some wayward shrimp or worm or snail to pass The ribbon worm it strikes, its mouth extends, turns inside out If poor invertebrates could talk you bet your life they'd shout And now the Nemertean in a sort of reverse pout The outside-in proboscis now reverts to outside-out The sated worm it slowly skulks back to its slimy lair Leaving all remaining creatures quaking silently in fear

I wrote one of my first marine biology poems about ribbon worms, almost 10 years ago

#DeepDay 2025 is all about advancing knowledge—scientific and cultural—to protect the deep sea. The more we know, the better we can protect.

There is so much to discover in the deep sea, but what we know is that it is critical for the functioning of our planet. buff.ly/dglpCPc

Greenhouse Proboscis-worms (Genus Geonemertes) Greenhouse Proboscis-worms from Singapore on April 21, 2019 at 12:12 AM by Melvyn Yeo

whoa and even more worm on spider NOM NOM! #wormwednesday Geonemertes www.inaturalist.org/observations...