Ligyrus gibbosus
(De Geer, 1774)
Carrot beetle
Ligyrus gibbosus, commonly known as the carrot , is a in the . measure 13–17 mm and are dark reddish- to black. The feeds on roots, grasses, and decaying vegetation in soil, and is recognized as a pest of sunflowers and other . Formerly classified under the Tomarus, it was reclassified to Ligyrus in a 2022 taxonomic revision.
Pronunciation
How to pronounce Ligyrus gibbosus: /lɪˈɡaɪrəs ˈdʒɪbəsəs/
These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.
Identification
can be recognized by their , oval body shape typical of , dark reddish- to black coloration, and size of 13–17 mm. The lacks the prominent horns seen in some other dynastine . Formerly identified under the Tomarus, specimens may be encountered under that name in older literature.
Images
Appearance
are 13–17 mm (0.5–0.7 in) long, dark reddish- to black in color. are with a dark .
Habitat
Occurs in agricultural fields and areas with sandy soils. and are found in soil, where they feed on roots and decaying matter.
Distribution
Widely distributed across North America. Recorded from Canada (Alberta, Ontario) and throughout the United States (Alabama, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, District of Columbia, Florida, Georgia, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Hampshire, New Jersey, New Mexico, New York, North Carolina, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Utah, Virginia, Washington, West Virginia, Wisconsin, Wyoming). Also present in Mexico (Aguascalientes, Baja California, Chihuahua, Coahuila, Distrito Federal, Durango, Guanajuato, Morelos, Nuevo León, San Luis Potosí, Sinaloa, Sonora, Tamaulipas, Zacatecas).
Diet
Feeds on roots, grasses, and decaying vegetation in the soil. Documented as a pest of sunflowers and other .
Host Associations
- sunflower - pest feed on roots, causing stunting, wilting, and
Life Cycle
are with a dark and develop in soil. Specific details on and time are not documented in available sources.
Behavior
are active in soil where they feed on roots and matter. can be detected by excavations near the base of stalks made by skunks and other mammals foraging for the .
Ecological Role
Contributes to soil through consumption of decaying vegetation. Serves as for skunks and other soil-foraging mammals.
Human Relevance
Recognized as an agricultural pest, particularly damaging to sunflowers in sandy soils of the Texas Rolling Plains. Control measures include managing pigweed in and around fields, as this weed may harbor the pest.
Similar Taxa
- other rhinoceros beetles (Dynastinae)Similar body form, but L. gibbosus lacks prominent horns and has distinctive dark reddish- to black coloration
- Tomarus (former genus placement)Formerly classified under this ; specimens in older literature or collections may be encountered under this name
More Details
Taxonomic history
L. gibbosus was formerly placed under the Tomarus until a 2022 revision by López-García, M.M. and C. Deloya reclassified it to Ligyrus.