Autonomous Biological Units, especially for Reproduction

I’m not sure where to post this, but since this seems to be initially a creation of the movies, this seems like the appropriate forum.

I’ve been fascinated by a concept that appears to have been born in the cinema, although it’s bled out into other forms of pop culture. I can’t think of any examples in science fiction literature prior to what I’m going to say, or – even better - in Real Life. Although I’d be grateful if anyone could point to pre-movie examples.

What I’m thinking about is an Autonomous Living Item that is created to establish one desired goal, then dies. It’s not really a creature in its own right, since is always created by the parent unit, doesn’t feed or reproduce on its own, and has a circumscribed period of existence. It can’t really exist on its own, or without the parent. As far as I know, there’s nothing like this in the real world – any examples I come up with end up requiring special pleading.

The first case I can think of were the “Inject-a-Pods” from the Roger Corman’s 1956 opus It Conquered the World That’s the one with the creature from Venus that’s shaped like a teepee with giant crab-claws and a stupidly evil grinning face. It gains control of people by emitting “inject-a-pods” that look like bats, little autonomous flying units whose only purpose is to inject some sort of control mechanism into people, after which they are subject to the Venusian’s will. Both the Venusianand the inject-a-pods were manufactured for the film by Corman’s favorite low-budget creature maker, Paul Blaisdell. The screenwriters were LouRusoff and an uncredited Charles B. Griffith (who acted in the movie), so I guess they’re the guys we have to thank for this concept.*


Inject-a-pod in upper left:
https://www.google.com/search?q=Blaisdell+Inject+a+pod+It+Conquered+the+World&source=lnms&tbm=isch&sa=X&ved=0ahUKEwj8nMuGq_PYAhVFnuAKHRBtAokQ_AUICigB&biw=1440&bih=729#imgrc=LTLx47rNBOhj9M:&spf=1516890928852
The Autonomous Biological Unit (ABU) got its next outing with the movie Alien, this time with the goal of injecting the embryonic monster into the host. the Face Hugger looks like two hands stuck together at the wrist, with a long tail and a scrotal sac. It was designed by H.R. Giger for Ridley Scott’s film (I’ve long felt that Alien would not have been the success it was were it not for Giger’s visual design). This is what sits in the Alien egg, and it’s clearly alive enough to seek out and pounce on a victim, then fight off attempts to dislodge it. It’s a clever bit of pseudobiology, in that it implants its creature, then dies and leaves its victim apparently well and unharmed, allowing the victim to carry the “infection” into a mass of its fellow beings. It’s the kind of reproductive strategy that would probably work, if this was a Real Life thing, but as far as I know, it isn’t.

As far as I know, nobody said anything about this at the time the film came out, but it’s really a pretty revolutionary concept. After all the Alien films in the franchise, all of them using this idea, people have pretty much come to take it for granted. But it’s a pretty significant idea.

Xtro, a 1982 film building on the success of Alien, has several variations on the ABU concept, but it’s not very coherent.

A better use of it came with the 2006 film Slither, which was sort of a “throw all the tropes in a blender and see which ones stick” kind of film that used concepts from Alien, The Blob, Night of the Living Dead, and others in a sort of hodgepodge of horror. The trouble starts, as in The Blob, with a meteorite, from which emerges a sluglike creature that crawls along until a likely victim comes along, in which it shoots an impregnating dart. So the slug is a reproductive ABU. Later in the film, the altered victim alters a woman to become a bioreactor creating a mass of slugs that act like the inject-a-pods, turning people they attack into controlled slaves, so it also has that kind of ABU.
The idea was used again in the 2012 film Prometheus, which is part of the Alien universe, but where the ABU isn’t a face-hugger, but the octopus-like creature that gestates inside Elizabeth Shaw after she has sex with Charlie Holloway, who has been infected by alien goo for no apparent reason by the android David. Shaw gets the thing out of her abdomen using an autodoc, but it survives and, at the film’s end it attacks the Engineer and implants an alien-like embryo insid him. Clearly, despite its weird-ass lifecycle, the octopus-like thing is an ABU and the Alien-clone the intended lifeform.
There are undoubtedly other examples, and not just in Alien-derived movies, books, and comics. The idea, like an ABU, has taken on a life of its own, at least long enough to infest other media.

Does anyone know of any prior examples in film or literature? Or any examples in the real world? (And don’t tell me that a beehive is like this – there’s a huge difference between a Queen Bee with her drones and workers and the ABU with its Host. Nor about termites, or about the weird way that fungi and parasites can “reprogram” animals to act differently. There’s no ABU there at all.)

*The inject-a-pods differ from prior “mind control” alien monsters in that it’s not them doing the controlling. Heinlein’s “slugs” in The Puppet Masters continue to ride on their slaves’ backs, and each is a unique individual when not tied in with the others, although they connect to form a shared hive-mind. Finney’s “Body Snatchers” start as seed pods, but that’s clearly the “larval form” of the final creature – the pod isn’t a separate temporary creature

It sounds like you’re assuming that face-huggers are just a carrier for some other embryo which is also the direct offspring of the queen. I’d always assumed that the embryo that the face-hugger injected was the face-hugger’s own offspring, which would make this an example of alternation of generations, something which is found in the real world (albeit mostly in plants).

This could ultimately boil down into nothing more than definitions. Yes, I’ve assumed that the Face-Huger (and other examples given) is an autonomous creation of the Alien, part of its life cycle. But if it’s “really” that generations alternate forms between Face-Hugger and full-blown Alien, how would it look any different?
As argument against the necessity of alternating appearance of generations, I note that in the original Alien, the fully adult-Alien was supposed to have itself injected embryos into Captain Dallas, who Ripley later found glued to the wall in the Nostromo – but that scene got cut. it was a fully-grown Alien that placed an embryo inside Ripley in alien 3, and again it was a fully grown Alien that implanted embryos in pregnant women in the execrable second Alien vs. Predator movie.
But: a.) you can argue that these aren’t “canon”
b.) Who says that the generations really have to alternate?
In any event, I’m curious about these examples of real-world “alternation of generation” cases, especially any that aren’t plants.

Are fungi sufficiently different from plants? Let’s take the example of Puccinia graminis, which causes stem rust of wheat. It has two different hosts, five stages of its life cycle with five different spore types, and three reproductive phases. This is so frakken complicated that I’m just going to link to a couple of sites that describes its life cycle in more detail than you can possibly imagine.

If it can’t run after me and bite me, I’m lumping it in with the plants.
Interesting cycle. Reminds me of Slime molds.

As a general rule of thumb in biology, if you can think up something really weird for living things to do, then some living thing somewhere does it, except weirder.

I always thought of the facehuggers as larvae. They don’t seem any more “single-minded” than fly larvae. Once inside of their growth medium, they eat and eat and then transform morphologically into their adult form.

Why leave out plants? Pollen and spores are exactly what I was thinking of when I was reading your post. Leaving those out is saying “give me real world examples but not the very, very, very common real world examples.”

Not digging too deep into non-plant examples now because I’m tapping it out on a phone, but how about this one?

Isn’t this what sperm are? Small single celled semi-autonomous creatures that exist for one purpose, to meet an egg and allow the host organism to reproduce?

Well, except that most of the FaceHugger then falls off. Unless you view that as a disposable part of the larva, and only the essential larval part gets implanted.

It’s still weird, though – I’m not aware of any larval that does do that.

I really hope that this isn’t really true – I’ve read of some damnably awful things, and conceived of a few on my own, that I’m glad I have not seen running rampant through the world.

We do seem to be constrained by the laws of Natural and Sexual Selection and the limits of Adaptive Radiation. I might imagine a parasite with diamonds for teeth that can make its way past any barrier , then burrow into your body to nest in your bones, creating copies of itself a la viruses using your bone marrow for raw material, then burst forth to multiply again, but the evolution of such a beast seems refreshingly unlikely.

How about this?

You just perfectly described Mr. Meeseeks.

For instance, here is something that is clearly from Stranger Things’ “Upside Down” dimension. It is actually a highly successful species of mole, the star-nosed mole (Condylura cristata), with the most sensitive collectoin of Eimer’s organs and one of the fastest sensory responses of any animal. Or the massive variety and adaptations of sea cucumbers.

Sperm are certainly motile. I can’t think of any creature that produces a multicellular ovipositor that is mobile and completely freestanding (and it is unclear how or if the “Xenomorphs” in the Alien franchise reproduce sexually if at all) and it is difficult to see the evolultionary advantage of such but it wouldn’t suprirse me if there is some analgoue in the animal kingdom.

Stranger

Interesting and weird, but not really the same.

Is this the same as the “worm” that basically creates a new version of itself out of its digestive system?

Star-nosed moles I know well. My friend earned our group a prize of a watermelon at summer camp by finding a (dead) one and presenting it to the camp museum. But not weird in this sense.

You bring up an interesting point about sperm – they closely resemble what I describe – they’re biological units that are charged with a single goal, and which can follow biochemical cues that direct it towards its goal, and it’s even reproduction. On the other hand, it clear is the creature (or at least half of it), not a separate entity tasked by the creature with delivering something to a goal. It’s a strtetch to call the swimming tail of the sperm such an autonomous unit.

Not precisely that, but there is a starfish (Linkia) whose larval form hatches as a swimming creature - with a tiny starfish attached. It swims about feeding until the starfish grows to a certain point. It then settles to the sea floor, the starfish separates and goes off to grow up, and the swimmer, relieved of the weight, swims off and resumes its swimming existence for days to weeks. :eek:

Another fictional example is that one of the flying forms in Wayne Barlowe’s Expedition is actually a subcomponent of one of the larger, land-based forms.I don’t remember which off the top of my head (maybe the sea striders?) but you can find them browsing around in the book. (That’s no terrible burden.)

Where do the triffids go then?

Kinda a skew example but what about the golems from David Brin’s Kiln People?

In it, people create copies of themselves - out of a special clay that can imitate life - and place a copy of their own brain patterns in them. Golems can last a day for short term chores or even longer for other chores. At the end of their life cycle the golems attempt to return to their originator so their memories can be uploaded to the originating brain and they live on that way.

A placenta strikes me as a real-life example. It’s created by the fetus, but mostly separate from it, survives only as long as it’s needed to serve as the interface between mother and fetus, then dies.