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tipnaree · a day ago

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Vampyroteuthis Infernalis (Vampire squid) 🦑 for @lamentera

#Vampyroteuthis Infernalis #vampire squid #marine biology #cephalopod #ocean life #biology #squid #marine snow #dawn tag #ellisgifs #crawling out of my cave to gif cephalopods for dawnie #because they deserve it <3 #and i love them A Lot :)))#😘😘😘😘#HAPPY BIRTHDAY DAWN ILYSM #have a lil token of my love for your love of sea beasties <3 #VAMPIRE SQUIDDDD #THE CARMILLA OF CEPHALOPODS

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debelice · 22 hours ago

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Fish in a jellyfish .....

#mine mlgc #ocean life #source my reddit blog

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chilirasbora · 4 months ago

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Crabeater seal | Lobodon carcinophagus

Fun fact: crabeater seals don't eat crabs, nor do they really even encounter them! Their diet consists of 90% krill, which is what caused their teeth to be so specialized.

X, X

#boras posts #salt #marine life #ocean life #ocean #seal #marine mammal

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angelnumber27 · a month ago

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Dirona Albolineata

Jeff Goddard

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protectoursharks · 7 months ago

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Hexabranchus sanguineus or Spanish Dancer

Spanish Dancers are the largest known nudibranchs. They are vivid shades of red, pink or orange, often mixed with white or yellow. Their bright colors warm predators of the toxins in their body.

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nonetoon · 5 months ago

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Hope everyone is ready for some ocean fun, Sea Legs is here!

#my art #comic #comics #sea legs #long post #seal #sea lion #animals #ocean life

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seffien · 3 months ago

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thinkin bout marimos

#sea life #sea #ocean life #marimo #moss balls #moss ball #plant #plants #sea plants #algae

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beautyunderthewaves · 18 days ago

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The Giant Oarfish

These beautiful fish grow up to 36 ft and are considered the longest bony fish of the modern day!

They are also thought to be a cosmopolitan species meaning that they are found in most oceans around the world!

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spontaneousmusicalnumber · 2 months ago

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Can I have a weird animal fact plz

Wanna hear about SHARKS and EARLY EMBRYONIC DEVELOPMENT and COMMON CULTURAL MISCONCEPTIONS?

And no, it's not that some species will eat their siblings before birth, though that does happen. If you're not an only child, be glad you're not a sand tiger shark.

Anyway, we're mostly talking about teeth. Now teeth, despite common cultural mindsets, aren't actually bones.

Bone is made of, well, bone: Most of your long bones have a rigid, dense layer outside (Cortical bone) and a spongy, lighter layer inside (cancellous bone), and a space inside for marrow and other tissues. Your bones aren't hollow, why waste that space when you could be making blood cells in there?

Teeth, on the other hand, don't have any actual bone inside. The outer layer, enamel, is the hardest thing in our bodies, which is one reason teeth are so easily fossilized. If our teeth were actually bones, then we'd be gumming our food by the time we're twenty.

I know some of you are asking: But, but, how do we know teeth didn't start out as bones and just got super specialized over time? I'd say, great question! We know they didn't for two main reasons.

Teeth come from a different embryonic layer than bone. Embryogenesis gets pretty complicated, but I'll try to explain it simply.

Back when you (and every animal) is first conceived, you start life as a single cell called a zygote, then that divides into a solid ball of cells. That ball of cells keeps dividing and becomes hollow inside. Then at some point, like sticking your thumb into the clay to make a little bowl in elementary school, a hole forms and the hollow ball of cells folds inside of itself to create some layers. Now look at you! You've got three layers of cells! You've got an outside, or ectoderm. You've got an inside, or endoderm. And you've got the cells between your inside and outside, or mesoderm.

Each layer of cells gives rise to different parts of you. The endoderm mostly makes the inner lining of your digestive tract. The mesoderm makes most of your insides, including your bones. And the ectoderm makes your skin and eyes and outsides, including your teeth.

We also know teeth aren't bones because teeth evolved before true bones. Sharks and their kin have well-developed teeth with enamel, but they don't have any mineralized bones in their bodies. Even their jaws aren't true bone, but an evolutionary precursor. It takes a whole different leap of evolution to add full-body mineralized bone to the vertebrate repertoire!

Now, let's bring some things together. Sharks, though we love to sing their smooth praises, have skin that has been used throughout history as sandpaper or protective coverings. This is due to a layer of dermal denticles covering the skin- note that I didn't say scales! Scales evolved from dermal bone, or thin plates of bone arising from the ectoderm layer. These structures aren't bony at all, they're made of a different material: enamel. Yep, the same stuff in teeth. Yep, arising from the same embryonic layer as teeth.