This study investigated if the external morphology of an insect had a negative effect on United States (US) preservice elementary teacher’s attitudes toward insects and beliefs concerning the likelihood of incorporating insects into future science education settings. 270 US kindergarten through sixth grade preservice elementary teachers participated and a randomized design with a control group was used for the study. The participants were shown pictures of three insects (i.e., butterfly, lady beetle or dragonfly) and were asked to rate their attitude toward the insects and beliefs concerning the likelihood of incorporating the insects into future science education settings. The treatment group was shown a picture of the larva and adult stage of the insect. The control group was only shown the adult stage of the insect. Unique to this study, is the finding that the external morphology of an insect is a causal factor that can negatively affect preservice elementary teacher’s attitudes toward insects and beliefs concerning the likelihood of incorporating insects into future science education settings. Implications are discussed that can assist preservice teacher training programs.