I am tired of explaining evolution to people. This is in response to the "missing link" you are talking about.
Sometimes during meiosis (cell division that creates gametes- the sperm and egg) mistakes occur. Maybe just during DNA transcription, perhaps due to radiation, a mutagen or some other factor. When they happen in body cells, they usually die or turn cancerous, but in the gametes they can be passed on the the next generation. These are mutations.
If the mutation happens in the active DNA (genes which actually do something) it usually only occurs in one gene. They create a new allele (a version of a gene). Genes are codes for proteins and enzymes that make other substances, thus creating living cells. The mutation will change the shape of the protein it makes, either changing it's function, making it inert, or just something benign like colour.
The mutation is either advantageous, disadvantageous, or neutral. Usually it is disadvantageous and the organism dies. Neutral mutations have no effect in it's current environment. But if the gene gives it an edge over the other individuals in the population, it is more likely to survive and pass on its genes to the next generation. Eventually the gene will be present in most of the population. It is still the same species, but it has evolved.
A succession of mutations like this, or a change in environment so that other, older genes become useful and more prevalent, will change the species even further. Eventually it will no longer be able to breed with the original species (If any even remain, in an isolated area). Either because its genetics are too different, its ecological niche differs too much, or maybe their courtship displays are no longer recognised by one another. A new species has been created.
The upshot of all this is that "missing links" are a bit of a misnomer. I can only assume that they refer to the common ancestor that two modern species are descended from, but they would have died out, since as the new species gradually emerged they would outcompete the old one, or the old one would have changed gradually into the new ones in the way described. I can only assume that buy "missing link" they mean a third modern species descended from the common ancestor that has changed very little over the millions of years. Of course, now there are two missing links, and all the in between states which probably were not recorded in the fossil record.
So it is unlikely that meeches are the missing link between scrabs and paramites, but they share a common ancestor, as do all living things on a planet if you go back far enough.
Scrabs and paramites are very different. Scrabs, Scrabanicus tyranni, are Scrabanidae, and paramites, Paramitus paramitus, are Phalangipodae. I do not know enough about meeches, Tretramandibi mudosus, to classify them into a family, but they seem very different.
Paramites and Scrabs were designed so that they had the same torso, for combining into Shrykull, even the veins on their necks are the smae. Meeches were not designed that way.
A side note: it is very easy to wipe out a species without meaning to, but Odd damn hard to wipe out a species intentionally. They may be hidden meech colonies out there, like it is suspected of Tasmanian Tigers. We just have to wait and see.
Phew! That was a long post!
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