Creature Feature: Sawblade Shrimp.

With vacation pics over with, it's time to get back to what this blog is all about: becoming inspired by how weird and wonderful the world is. Yes, believe it or not, this blog has a point- to get people all fired up about how amazing the world already is, and to then use that information to fuel creative projects. So let's head to the oceans again; there's always more than enough weird stuff, there.

Source.

If you'll look to the above pic, you'll see a red thing that looks almost like a branch, but not quite. That's a saw-blade shrimp (Tozeuma). It's yet another weird resident of the Indo-Pacific reefs, as well as the Red Sea. They grow 5cm, or roughly 2 inches, and feed on parasites, algae, and plankton.

These are pretty much the walking sticks of the sea. Of course, since this is the ocean, the weirdness has been cranked up to eleven. Banded saw-blade shrimp have bands (go figure)that break up their outlines, as well as transparent bodies. The ocellated saw-blade shrimp above simply looks a lot like the coral it's attached to.  Now you see it, now you don't.

Source.

Along with being simply excellent at camouflage, these shrimp have some important jobs to do. As previously stated, they eat parasites. Those parasites come off of other, larger animals that allow themselves a free cleaning from the shrimp. The saw-blades will also clean burrows, jaws, and other things that animals simply can't be bothered to clean.

There are also a ton of saw-blade shrimp waiting to be discovered, or at least named properly. Some people take excellent photos of unknown shrimp when they go to reefs on vacation. There's still a lot to learn about these bizarre, hunched crustaceans. And no, what they taste like is not on the list of things to learn...although a few oddballs have probably tried.

Let's Go Spelunking: Cave Shrimp + Crayfish

(Apologies: I went to take a nap and wound up sleeping longer than intended. Come hither, Hell Week...)

Remember when I mentioned that cave creatures had a strange aesthetic to them? Well, to be more specific, creatures that spend their lives exclusively in caves tend to have a few features in common.  These include pale skin, poor or absent eyesight, reduced size, and enhanced senses of hearing, touch, and smell. In human terms, 3/4 isn't bad, nerds.

Lincoln approves of cave shrimp?

Enter the Kentucky and Alabama cave shrimp (Palaemonias). They are both native to the Southwestern U.S. as their names imply. Yes, apparently the South has a lot of neat cave life. They eat anything that washes into the sediments underground. (FYI: Since several kinds of shrimp do in fact eat dirt like this, they are probably not the healthiest seafood in the world.) As the picture above demonstrates, they are smaller than a penny.

Cave shrimp are a prime example of what happens to 'normal' animals once they adapt to cave life. These shrimp are not just blind - they're completely eyeless. They're pure white with translucent skin. If they ever left the safety of the caves, they would die in a heartbeat. Even as they are, they have predators in other cave creatures such as salamanders, raccoons, and equally-blind cave crayfish (a case of the blind eating the blind).

Yes, crayfish live in the caves, too. There are several species (Cambarus pecki in Alabama; Procambarus elsewhere), several of which live in Florida and all of which are endangered. They look a lot like cave shrimp, only bigger, nastier, and with pincers. Like the shrimp, their skin is so light you can see through it - who needs melanin when you live in depths in which nothing can see? It's amazing; we could have saved so much mess in biology if some smart soul had bred translucent crayfish for us to study.

Both species of cave shrimp and all cave crayfish are endangered. The main cause for this classification is poisoned groundwater. As we've said before, freshwater ecosystems are fragile. So are species that are highly adapted to one environment. Cave shrimp will probably not be around much longer, so enjoy them while you can.