Tylonotus bimaculatus

Haldeman, 1847

Ash and Privet Borer

Tylonotus bimaculatus is a longhorn beetle (Cerambycidae) described by Haldeman in 1847. Commonly known as the Ash and Privet Borer, this is documented across North America with over 1,000 iNaturalist observations. As a member of the Cerambycinae and tribe Hesperophanini, it belongs to a group of wood-boring beetles whose larvae typically develop in hardwood trees.

Tylonotus bimaculatus by (c) Annika Lindqvist, some rights reserved (CC BY), uploaded by Annika Lindqvist. Used under a CC-BY license.

Tylonotus bimaculatus by (c) Justin Williams, some rights reserved (CC BY), uploaded by Justin Williams. Used under a CC-BY license.

Tylonotus bimaculatus 312890086 by jimeckert49. Used under a CC BY 4.0 license.

Pronunciation

How to pronounce Tylonotus bimaculatus: //taɪloʊˈnoʊtəs ˌbaɪmæˈkjuleɪtəs//

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Images

Distribution

North America, with confirmed records from Manitoba, Ontario, and Québec in Canada. GBIF distribution records indicate presence across the continent.

Host Associations

Fraxinus - larval ash trees, per
Ligustrum - larval privet, per

Similar Taxa

Other Tylonotus speciescongeneric share similar and wood-boring habits; precise identification requires examination of elytral markings and antennal proportions
Other Hesperophaninitribe members share elongate cylindrical bodies and cryptic coloration; T. bimaculatus distinguished by characteristic two-spotted pattern implied by specific epithet

More Details

Taxonomic Note

The specific epithet 'bimaculatus' (two-spotted) suggests distinctive elytral markings, though detailed morphological descriptions are not available in the provided sources. The was among the early North American cerambycids described by Samuel Stehman Haldeman, a prominent 19th-century American naturalist.

Nomenclatural Stability

The has maintained stable since its original description in 1847, with no recorded synonymy or taxonomic revisions in major databases (Catalogue of Life, GBIF, NCBI all list as accepted).