Heterotoma planicornis

Common Flathorn Plant Bug

Family: Miridae · Class: Insecta · Order: Hemiptera

Heterotoma planicornis is a plant bug in the family Miridae, one of the largest families of true bugs (Hemiptera). The species belongs to the tribe Orthotylini within the subfamily Orthotylinae, a group that includes numerous small predatory and plant-feeding bugs. Like other members of the genus Heterotoma, this species likely measures 3-5 millimeters in length, though specific morphological descriptions have not been well documented in the available literature. The distribution and range of H. planicornis in California remain poorly characterized. While the species appears in federal taxonomic databases maintained by the U.S. Fish and Wildlife Service, specific locality records and county-level distribution data are not readily available. The genus Heterotoma includes species found across North America, but the particular geographic range of H. planicornis requires further documentation. Habitat preferences for this species have not been specifically described in the scientific literature. Members of the family Miridae typically inhabit various plant communities, with different species associated with specific host plants or vegetation types. Some species in the genus are known to occur on herbaceous plants, shrubs, or trees, but the specific habitat requirements of H. planicornis remain undocumented. Ecological information about H. planicornis is extremely limited. Many mirid bugs are omnivorous, feeding on plant juices, small arthropods, or both, but the specific feeding behavior, host plant associations, and life cycle of this species have not been studied in detail. Seasonal activity patterns, reproductive biology, and population dynamics are similarly undocumented. The conservation status of H. planicornis is unclear due to the lack of available data on population trends, threats, or distribution. The species does not appear on federal or state endangered species lists as of December 2025, but this may reflect insufficient survey effort rather than population stability. Many small insects remain poorly studied, making conservation assessments difficult. Scientific documentation for this species remains extremely limited despite searches of major entomological databases and government wildlife resources. The information presented here represents the extent of currently available data from taxonomic databases maintained by the U.S. Fish and Wildlife Service. Comprehensive field studies are needed to document the basic biology, distribution, and ecological requirements of H. planicornis. If you have verified information about this species' biology, distribution, or ecology, please contact Species List Pro to help improve this species account.

Data from The California Species Project — 14,000+ California species with verified data from CNPS, CDFW, USFWS, and more.