The word, "tubercle", is used in this paper as a general term to indicate the location of a seta, or of a definite group of setae, or a process of the body wall bearing such a group.17] LEPIDOPTEROUS LARVAE -FRACKER 17 COMPABATIVE ANATOMY Caterpillars may be said to bear setae in all possible positions.Their great, number and uniform distribution in some species makes naming and homologizing them seem impossible.
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Stanley Black Fracker (1915) studied this question.