Sentence:  In generalized Diplura, Archaeognatha and some Thysanura, five parts or <WSD>apotomes</WSD> are distinguished, which from the anterior to the posterior part are: the presternum, the basisternum, the furcasternum, the spinasternum and the poststernum. 
Meaning of the word marked with <WSD> tags:  A distinct division of an insect which is divided from the other divisions by a pinch point.