The parasite has somehow evolved to turn off the host's defenses, presumably by disarming the crab's immune response with some chemical trickery that fools the host into accepting the parasite as part of itself. ...The adult parasite castrates the host, not by directly eating the gonadal tissue, but by some unknown mechanism probably involving penetration of the interna's roots around and into the crab's nervous system.
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Triumph of the Root-Heads, p. 367Stephen Jay Gould
» Stephen Jay Gould - all quotes »
In short, the root-head turns the crab into a Darwinian cipher, a feeding machine working entirely in the parasite's service. The castrated crab can make no contribution to its own evolutionary history; its "Darwinian fitness" has become flat zero. ...But ever so carefully, for the parasite must maintain the crab in constant and perfect servitude - not draining the host enough to kill this golden goose, but not letting the crab do anything for its own Darwinian benefit.
Stephen Jay Gould
Lernaeodiscus porcellanae turns control of the host into a fine art. After castration by the parasite, male crabs develop female characteristics in both anatomy and behavior, while females become even more feminized. The emerging externa then takes the same form and position as the crab's own egg mass... The crabs then treat the externa as their own brood. In other words, the parasite usurps all the complex care normally invested in the crab's own progeny.
Stephen Jay Gould
"Perfect replication is the enemy of any robust system... Lacking a central nervous system—much less a brain—the parasite is a simple system designed to compromise a very specific target host. The more uniform the host, the more effective the infestation."
Daniel Suarez
Or let us say that we have a green thing growing forever. Everything that is done is done by it. And on it we also have the red parasite crunching forever: and everything that is undone is undone by that. The parasite will present itself as a modern thing. It will call itself the Great Change. Less often, and warily, it will call itself the Great Renewal. But it can never be another thing than the Red Failure returned. It is a disease, it is a scarlet fever, a typhoid, a diphtheria; it is the Africa disease, it is the red leprosy, it is the crab-cancer. It is the death of the individual and of the corporate soul. And incidentally, but very often, it is also the death of the individual and of the corporate body. We are asked to swear fealty to the parasite disease which the enemy sowed from the beginning. I will not do it, and I hope that you will not.
R. A. Lafferty
The intricate and different life cycles of both male and female root-heads, and the great behavioral sophistication shown by the female in reconfiguring a host crab as a support system, all underscore the myopia of our conventional wisdom in regarding rhizocephalans as degenerate parasites because the adult anatomy of internal roots and external sac seem so simple.
Stephen Jay Gould
Gould, Stephen Jay
Govorov, Leonid
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