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Broad-Necked Root Borer (Prionus laticollis)


Detailing the physical features, habits, territorial reach and other identifying qualities of the Broad-Necked Root Borer.


 Updated: 8/30/2018; Authored By Staff Writer; Content ¬©www.InsectIdentification.org



  Broad-Necked Root Borer  
Picture of Broad-Necked-Root-Borer


The giant size of female Broad-Necked Root Borer Beetles and the fierce jaws of the smaller male give this species an unfortunately menacing appearance to humans.





This forest-dwelling beetle is at home in the eastern part of the continent. The 'neck' of the Broad-Necked Root Borer is quite wide and has small spikes along the sides. The body is black, but it may look like dark brown as well. In stark contrast to the dark overhead view, the ventral (belly) side of the abdomen is yellow. Females are mammoth in size. They are more than two times larger than males and because of their heft, they are unable to fly even though they have wings. In fact, this genus is as large (by weight) as Rhinocerous Beetles. The smaller male can fly, albeit noisily. Males have large mandibles making their jaws look like they could deliver a terrible bite. Typically, male beetles reserve use of these jaws for territorial battles with other males.

Broad-Necked Root Borers are most active in the summer months and can be see crawling on logs or the forest floor. Females deposit fertilized eggs into the soft earth using a syringe-like ovipositor. The eggs hatch and the larvae continue to dig deeper into the soil to find their food source: roots from trees and shrubs. They continue to feast on trees as they grow, consuming the inner bark and tissue for years before emerging as adults in the summer. Look for the Broad-Necked Root Beetle near woods and forests though it has been seen crossing parking lots between habitats. If this type of beetle has made a home near buildings, it is attracted to lights at night and has a propensity to hit windows reflecting light with a loud bang.

Basic Information
Common Name: Broad-Necked Root Borer
Other Name(s): Giant Root Borer
Scientific Name: Prionus laticollis
Category: Beetle


General Identification
Size (Adult; Length): 22mm to 75mm (0.86in to 2.93in)
Colorwheel Graphic
Identifying Colors: black, brown, maroon, yellow
Additional Descriptors: huge, bumpy, enormous, flying, jaws, hairy




Taxonomic Hierarchy
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Coleoptera
Family: Cerambycidae
Genus: Prionus
Species: laticollis


Beetle Anatomy
Graphic showing basic anatomy of a common North American Beetle insect
1
Antennae: Beetles have a pair of antennae on the head used as sensors.
2
Head: The head is home to the insect's eyes, antennae, and mandibles (jaws).
3
Thorax: Holds the three pairs of legs as well as vital internal organs.
4
Elytron: One of two wing cases on a Beetle that protects its wings (plural: elytra).
5
Wings: Appendages used for flying and kept under the elytra until needed.
6
Abdomen: Houses organs related to circulation, reproduction, and excretion.
7
Legs: Beetles have three pairs of legs located at the thorax, numbering six legs in all.


Territorial Reach (A-to-Z)
Note: An insect's reach is not limited by lines drawn on a map and therefore species may appear in areas, regions and/or states beyond those listed below as they are driven by environmental factors (such as climate change), available food supplies and mating patterns. Grayed-out selections below indicate that the subject in question has not been reported in that particular territory. U.S. states and Canadian provinces / territories are clickable to their respective bug listings.
Alabama
Alaska
Arizona
Arkansas
California
Colorado
Connecticut
Delware
Florida
Georgia
Hawaii
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
Vermont
Virginia
Washington
West Virginia
Wisconsin
Wyoming
Canadian National Flag Graphic
Alberta
British Columbia
Manitoba
New Brunswick
Newfoundland and Labrador
Nova Scotia
Ontario
Prince Edward Island
Quebec
Saskatchewan
Mexican National Flag Graphic
Mexico


Territorial Area Map (Visual Reference Guide)
The map below showcases (in red) the states and territories of North America where the Broad-Necked Root Borer may be found (but is not limited to). This sort of data can be useful in seeing concentrations of a particular species over the continent as well as revealing possible migratory patterns over a species' given lifespan. Some species are naturally confined by environment, weather, mating habits, food resources and the like while others see widespread expansion across most, or all, of North America.
Alaska  
Hawaii  
Prince Edward Is.  
State of Alabama graphic
State of Arizona graphic
State of Arkansas graphic
State of California graphic
State of Colorado graphic
State of Delware graphic
State of Florida graphic
State of Georgia graphic
State of Idaho graphic
State of Illinois graphic
State of Indiana graphic
State of Iowa graphic
State of Kansas graphic
State of Kentucky graphic
State of Louisiana graphic
State of Maine graphic
State of Maryland graphic
State of Michigan graphic
State of Minnesota graphic
State of Mississippi graphic
State of Missouri graphic
State of Montana graphic
State of Nebraska graphic
State of Nevada graphic
State of New England graphic
State of New Jersey graphic
State of New Mexico graphic
State of New York graphic
State of North Carolina graphic
State of North Dakota graphic
State of Ohio graphic
State of Oklahoma graphic
State of Oregon graphic
State of Pennsylvania graphic
State of South Carolina graphic
State of South Dakota graphic
State of Tennessee graphic
State of Texas graphic
State of Utah graphic
State of Virginia graphic
State of Washington graphic
State of West Virginia graphic
State of Wisconsin graphic
State of Wyoming graphic
Canadian territory of Alberta graphic
Canadian territory of British Columbia graphic
Canadian territory of Manitoba graphic
Canadian territory of New Brunswick graphic
Canadian territory of Newfoundland and Labrador graphic
Canadian territory of Ontario graphic
Canadian territory of Quebec graphic
Canadian territory of Saskatchewan graphic
Territory map graphic of the country of Mexico
Contiguous United States shape map layer graphic


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