Tetraclipeoides denticulatus
(Haldeman, 1848)
Tetraclipeoides denticulatus is a of scarab beetle in the Aphodiinae, described by Haldeman in 1848. It is distributed across the western and central United States and western Canada. The species has been historically confused with bark and ambrosia beetles, as evidenced by its misidentification as "Gnathotrichus denticulatus" in major entomological collections. It belongs to a of dung beetles within the diverse Scarabaeidae .
Pronunciation
How to pronounce Tetraclipeoides denticulatus: /ˌtɛtrəˌklaɪpiˈɔɪdiːz ˌdɛntɪˈkjuːlətəs/
These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.
Identification
The specific epithet "denticulatus" (meaning small-toothed) suggests the presence of finely toothed structures, likely on the , tibiae, or elytral margins. As a member of Aphodiinae, it can be distinguished from bark beetles (Scolytinae) by its (plate-like) with a distinct club, rather than the compact, saw-toothed or bead-like antennae typical of Scolytinae. It lacks the pronounced declivity ( slope) characteristic of many bark beetle .
Distribution
Western and central United States (California, Colorado, Idaho, Montana, Nevada, New Mexico, Oklahoma, Oregon, Utah, Washington, Wyoming) and western Canada (Alberta).
Human Relevance
Specimens of this have been collected for scientific study and deposited in major research collections. The species was notably misidentified as an ambrosia beetle (Gnathotrichus denticulatus) in the University of Florida's 20,000-vial cryo-collection milestone, highlighting ongoing challenges in identification and the importance of accurate taxonomic verification in entomological collections.
Similar Taxa
- Gnathotrichus denticulatusThis name has been applied erroneously to Tetraclipeoides denticulatus in collection databases and publications. Gnathotrichus are true ambrosia beetles (Curculionidae: Scolytinae) with cylindrical bodies and different antennal structure, whereas Tetraclipeoides is a scarab beetle (Scarabaeidae) with .
- Other Aphodiinae speciesMany small aphodiine dung beetles share similar size and general body form, requiring examination of mouthparts, tibial spurs, and male genitalia for definitive identification.
Misconceptions
This has been repeatedly misidentified as an ambrosia beetle due to the shared specific epithet "denticulatus" and superficial similarities in size. The misapplication of the name Gnathotrichus to this species in major institutional collections demonstrates how nomenclatural coincidences can propagate taxonomic errors.
More Details
Taxonomic History
The was originally described by Haldeman in 1848. It has been placed in the Tetraclipeoides, a group of small aphodiine scarabs. The persistent confusion with Gnathotrichus denticulatus (a valid species of ambrosia beetle) underscores the importance of verifying identifications against primary literature and .
Collection Significance
The misidentification of this in the University of Florida's milestone 20,000th vial collection highlights that even major research institutions can harbor taxonomic errors, particularly when working with large, diverse collections and similar epithets across unrelated .