Red milkweed beetles are 8-15 millimeters long. They are narrow, thin beetles. They are reddish in color with matching black spots. Their antennae are smooth. Larvae are pale in color, elongated, and ridged. The food that they eat impacts how big they grow. (Coin, et al., 2019)
Tetraopes tetrophthalmus, commonly known as red milkweed beetles, are native to the Nearctic. They are found in the northeastern part of North America. (Coin, et al., 2019)
Tetraopes tetrophthalmus, commonly known as red milkweed beetles, are found in the northeastern part of North America. (Coin, et al., 2019)
Red milkweed beetles are most commonly found near their host plant, common milkweeds. (Coin, et al., 2019)
Red milkweed beetles go through different stages of development. Larvae go through a few stages before becoming pupae. They undergo metamorphosis in order to become adults.
Red milkweed beetles use internal fertilization and sexual reproduction. Females lay eggs on their host plants. Females select larger males for mating over the smaller males. (Mason, 1983)
Red milkweed beetles do not take care of their young.
The lifespan of red milkweed beetles has not been determined.
Adult red milkweed beetles move around to eat during June and July. They spend their time alone. As fliers, red milkweed beetles are able to easily move around. (Mason, 1983)
Red milkweed beetles mostly communicate through pheromones. They use visual, tactile, and chemical senses of perception.
Red milkweed beetles eat the leaves, stems, and flowers of their host plant, common milkweeds. They have also been observed feeding on horsetail milkweeds. Those that eat horsetail milkweeds are smaller than those that eat on common milkweeds. Adults eat the leaves and stems. Larvae eat the roots. (Coin, et al., 2019; Mason, 1983)
Red milkweed beetles impact the species of plants from which they feed.
They can be household pests.
Red milkweed beetles are not currently undergoing any conservation efforts.
Deena Hauze (author), Animal Diversity Web Staff.
Coin, P., B. Moisset, R. McLeod, M. Quinn. 2019. "Species Tetraopes tetrophthalmus - Red Milkweed Beetle" (On-line). Bug Guide. Accessed October 23, 2020 at https://bugguide.net/node/view/2966.
Erwin, A., T. Züst, J. Ali, A. Agrawal. 2014. Above-ground herbivory by red milkweed beetles facilitates above- and below-ground conspecific insects and reduces fruit production in common milkweed. Journal of Ecology, 102(4): 1038-1047. Accessed October 26, 2020 at https://www.jstor.org/stable/24541559.
Mason, L. 1983. Secondary Sexual Characteristics and Sexual Selection in Tetraopes. The American Midland Naturalist, 110(2): 235-239.
Matter, S. 2009. Abundance of an Herbivorous Beetle: Factors Affecting Dispersal and Local Reproduction. The American Midland Naturalist, 162(1): 19-28. Accessed October 26, 2020 at https://www.jstor.org/stable/25602294.
Price, P., M. Willson. 1976. Some Consequences for a Parasitic Herbivore, the Milkweed Longhorn Beetle, Tetraopes tetrophthalmus, of a Host-Plant Shift from Asdepias syriaca to A. verticillata. Oecologia, 24(4): 331-340. Accessed October 26, 2020 at https://www.jstor.org/stable/4215330.