Hey /sci/, Say I want to start breeding cockroaches for size. How soon will there be noticeable results?
I think they're cute when they aren't spreading salmonella around.
They're insects. 6 legs and head+abdomen+thorax structure is usually enough to tell. They look like beetles, but it's more accurate to think of them like mantises or earwigs. They are close relatives to mantises and very close relatives to termites. Apparently termites is what happened when a subspecies of little cockroach guys evolved colony structure.
It is nice that there are centipedes in your gnarly ass but centimeters are no insects.
Malpighi vessels transport air into the insect abdomen. Passively, and laws of physics limit that. So the max diameter of any insect abdomen is limited to approx 10 cm.
Recent research involving very bright x-ray sources and computer tomography has found insects significantly pump air in and out of their tracheas! I don't know if anyone has martyred a cockroach in that manner yet but these dudes claim to have confirmed significant respiration of the madagascar hissing cockroach by more mundane means. Pic related, how they confirmed that it inhales through the front and exhales through the back.
Better question, how many generations would it take to breed a regular quarter stallion/equus caballus with the same testicular dimensions as an imperial zebra/equus grevyi?
Isn't there some advantage in breeding animals to be more virile, if their sperm is a valuable commodity? A few straws of good quality issue can go for thousands of dollars, wouldn't it be a good idea to capitalize on that?
Pic related, the zebra's gonads are almost three times as massive.
Just smuggle some giant cockroaches from China through customs to get started.
They breed them big as food there.
Or pic related, Australian cockroaches.
Try growing them in a hyperbaric chamber, the more oxygen they have the less the natural atmospheric conditions can limit their development. Back in the hyper-oxygenated carboniferous period there were bugs as large as VW beetles crawling around, I dont see why roaches should be any different
Don't bother selecting. Just let their larvae grow up and metamorphose in a high oxygen atmosphere. Back in prehistoric times when oxygen was more prevalent in the atmosphere you had giant insects. Insects in fact haven't changed that much so its worth a try.
There were very large arthropods (2 meter millipedes!) but the biggest insect fossils we've identified are of giant dragonflys with bodies about the size of a crow and 70 cm wingspans. Having more than six legs makes being huge a lot easier presumably.