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plural cephalothoraxes or cephalothoraces
The fused head and thorax of spiders and crustaceans quotations examples
"Come in!" says the gray spider to the house-fly; "I have entertained a great many flies. I have plenty of room, fine meals and a gay life. [...] Philosophers have written volumes about my antennae and cephalothorax."
1874, T. De Witt Talmage, Around the tea-table