How you suppose the breeds of the extended Zerg swarms are composed?

[Zoar]

if i remember correctly that bit of info is from the Field Manual

[Zoar]

correction, its not in the field manual its on the official Starcraft 2 site in the game guide under the specimen analysis section

[Nolanstar]

I suspect maybe in the Leviathan brood they tried to mix viper and defiler DNA together, though the skins only said the vipers exhibit more defiler traits than the other broods, despite the fact that the viper was one of the original zerg strains and the defiler wasn't.

Vipers were not an original zerg strain. They fall into the same category as Swarm Hosts given that the swarm cobbled them from similar primals. Defilers might be "original" in the sense of being a designed organism, rather then assimilated (core genus unknown)

[Mislagnissa]

Some of the SC2 breeds have no core genus listed or have no date given for their assimilation. For example, the brood lord and corruptor have no core genus listed and may be a result of splicing existing genomes like the queen and mutalisk. The lurker, devourer and infestor could have been in the swarm since before the Great War.

There's no reason the broodmothers could not have been present before the Great War. According to SC1 manual (before the SC2 retcons) the xel'naga kept detailed genetic histories of the species they manipulated. Perhaps the Overmind tried to clone Protoss and, while the attempt was a failure, it led to the creation of the broodmothers (who are mouthless and have dreadlocks like Protoss).

[ragnarok]

Some of the SC2 breeds have no core genus listed or have no date given for their assimilation. For example, the brood lord and corruptor have no core genus listed and may be a result of splicing existing genomes like the queen and mutalisk. The lurker, devourer and infestor could have been in the swarm since before the Great War.

There's no reason the broodmothers could not have been present before the Great War. According to SC1 manual (before the SC2 retcons) the xel'naga kept detailed genetic histories of the species they manipulated. Perhaps the Overmind tried to clone Protoss and, while the attempt was a failure, it led to the creation of the broodmothers (who are mouthless and have dreadlocks like Protoss).

That's kind of how I originally saw the Viper and Swarm host, (prior to Blizzard giving us info for HotS), that they were created merely via DNA recombination experiments or something

[Nolanstar]

My point being is specifically the defiler in the SC1 manual has a core genus unknown, and is the only unit to do so, wheras most sc2 stuff they didn't even bother doing this with. Its possible some stuff is dna recombination, but there could easily be a core for something like a corruptor, even if its literally a squid with gravitic-modifying properties from some planet.

[Zoar]

the Scourge also has unknown core genus in the original manual as well

[Mislagnissa]

the Scourge also has unknown core genus in the original manual as well

Maybe it was subject to enough genetic alteration that the designation no longer applies, much as the original SC2 website said the broodmothers/new queens had an unknown core genus due to the inclusion of Terran and/or Protoss DNA. Gradius' Origins campaign has them being derived from what are either larval behemoths or some kind of parasite that lived on behemoths (I cannot tell since the map gives no details on them) and supposes that locusts share the same origin. We don't know the point at which a Zerg breed can be said to no longer have a core genus, since all Zerg have genes from several different species which gives their characteristic shared appearance and capabilities.

That raises the question of who is writing the manual, since the text is consistent with being written by a handful of authors at most (and contains minor contradictions, probably due to multiple drafts and lack of proofreading). Is it written in-character, out-of-character or omniscient narrator? By Terrans, Zerg or Protoss? How did they learn all they wrote?

[ragnarok]

My point being is specifically the defiler in the SC1 manual has a core genus unknown, and is the only unit to do so, wheras most sc2 stuff they didn't even bother doing this with. Its possible some stuff is dna recombination, but there could easily be a core for something like a corruptor, even if its literally a squid with gravitic-modifying properties from some planet.

Maybe back then they wanted to do that to keep things mysterious and everything, which would be a neat point for an alien race because you don't know just what planets the Overmind visited, what exact species it took into the swarm, and so on. It only proved Kerrigan was much less creative for such things for her efforts in trying to evolve the swarm

[drakolobo]

its core can be adn viral