In those flat heads there would be no room for brains. But he noticed the hump that rose between the bases of the necks, where the man became a thick protective mop and a memory floated up from eighteen decades behind him. This was a puppeteer, a Pierson's puppeteer. Its brain and skull were under the hump. And its eyes, one to a head in deep bone sockets, stared fixedly at Louis Wu from two directions.
Allometric growth is the phenomenon of the different growth rates of parts within the same organism.
This webpage will explore the development of the alien through fertilization, cleavage, gastrulation, neurulation, and organogenesis. Fertilization in the alien, will play out exactly as is would in a normal vertebrate. The acrosomal region of the sperm and the plasma membrane of the egg will fuse releasing enzymes. The DNA enters the eggs cytoplasmand the mitochondria and tail are excluded. This original protein does not require any new DNA synthesis as stored mRNA in the egg cytoplasm.