Masters Thesis

Gross internal morphology of Anasa tristis De Geer.

Two hemipterans, Oncopeltus fasciatus Dallas (Lygaeidae) and Leptocoris trivittatus Say (Corizidae) (Feir, 1974; Woolley, 1949), have been used extensively in research and teaching due to availability and/or ease of rearing. The common squash bug, Anasa tristis De Geer, should be added to the list since it is easily reared in the laboratory, is larger in size than either of the above, and the internal organs are brightly and differently colored permitting color coding. Additional advantages are the plant and fruit feeding habit of this species as opposed to the strictly seed feeding O. fasciatus, and the fact that it belongs to another family (Coreidae). The first steps in establishing the squash bug as a laboratory animal are the development of rearing methods, the collation of current knowledge, and the preparation of an available anatomical study. This paper describes the gross anatomy of the majority of the internal non-skeletal organ systems of the squash bug A. tristis De G.