Sexual differences in the growth of Pteronarcys californica Newport and Pteronarcella badia (Hagen) (Plecoptera)

Abstract

Two species of Plecoptera, Pteronarcys californica Newport and Pteronarcella badia (Hagen), were collected seasonally from a single site in the Provo River, Utah. Body weights of the living animals were used to distinguish four size classes in each sex of Pteronarcys californica, and one size class for each sex of Pteronarcella badia. Ovaries, fat bodies, and guts were dissected from Pteronarcys californica. Growth of whole animals and of the organs are discussed with regard to life cycle, sexual development, and age. The importance of weight measurements on insects to be used for physiological studies is discussed.