round-necked longhorn beetle

(Clytus ruricola)

Conservation Status
round-necked longhorn beetle
 
  IUCN Red List

not listed

 
  NatureServe

NNR - Unranked

 
  Minnesota

not listed

 
           
           
           
           
           
           
           
 
Description
 
 

Round-necked longhorn beetle is a common, medium-sized, wood boring beetle. It occurs in the United States from Maine to northern South Carolina, west to Minnesota, Illinois, and Georgia. It also occurs in southern Canada from Nova Scotia west to Alberta. Adults are found from May to early August in deciduous forests. They feed on the pollen of many flowers in numerous plant families. The larvae feed on the rotting wood of hardwoods, especially maple.

Adults are to (10 to 15 mm) in length. They are black with bright yellow markings. When in flight they resemble a yellowjacket or paper wasp. This is an example of Batesian mimicry, mimicking the defensive coloration of a defended species. The body is elongated, rather robust, and somewhat cylindrical. It is constricted between the thorax and the abdomen, forming a distinct rounded “neck”.

The head is large and entirely black. The face is slanted forward or nearly vertical. There is no ridge (carina) on the front of the head. The compound eyes are deeply notched. The small antennae-like structures (palps) emerging from the lower jaws (maxillae) are blunt or straight across at the tip, not pointed. The antennae are slender, thread-like, and long, at least half as long as the body. They are mostly reddish-brown but the last 4 to 5 segments are black.

The exoskeletal plate covering the thorax (pronotum) is black, rounded on the sides, widest near the middle when viewed from above, and strongly convex when viewed from the side. It is densely pitted (punctate), but it does not have a transverse ridge. There is a single, narrow, yellow band on the front and lateral margins that extends only slightly onto the rear margin on each side. The small plate between the wing bases (scutellum) is yellow.

The hardened forewings (elytra) are broad at the base, round at the tips, and black with yellow markings. On each elytron there is an oblique, oval spot in the basal third; a U-shaped band extending from the inner margin (suture), back to the middle, then forward and outward to near the leading edge (costal margin); and an oblique bar beyond the middle.

The legs are long and mostly reddish-brown. The third segment (femur) on each leg is narrow and reddish-brown at the base, swollen (clubbed) and black from the middle to the tip. The last part of each leg (tarsus), corresponding to the foot, has five segments. The first segment is very long. The fourth segment is very short and is concealed within the lobes of the heart-shaped third segment, making the tarsus appear to have only four segments.

 
     
 

Size

 
 

Total length: to (10 to 15 mm)

 
     
 

Similar Species

 
     
     
 
Habitat
 
 

woodlands

 
     
 
Biology
 
 

Season

 
 

One generation per year: May to early August

 
     
 

Behavior

 
 

 

 
     
 

Life Cycle

 
 

 

 
     
 

Larva Food

 
 

Rotting wood of hardwoods, especially maple

 
     
 

Adult Food

 
 

Flower pollen

 
     
 
Distribution
 
 

Distribution Map

 

Sources

7, 24, 27, 29, 30, 82, 83.

 
  7/1/2023      
         
 

Occurrence

 
 

 

 
         
 
Taxonomy
 
 

Order

Coleoptera (beetles)  
 

Suborder

Polyphaga (water, rove, scarab, long-horned, leaf, and snout beetles)  
 

Infraorder

Cucujiformia  
 

Superfamily

Chrysomeloidea (longhorn beetles and allies)  
 

Family

Cerambycidae (longhorn beetles)  
 

Subfamily

Cerambycinae (typical longhorn beetles)  
 

Tribe

Clytini  
 

Genus

Clytus  
       
 

Synonyms

 
 

Clytanthus ruricola

 
       
 

Common Names

 
 

field long-horned beetle

round-necked longhorn beetle

 

 

 

 

 

 

 

 

 

Glossary

Costal margin

The leading edge of the forewing of insects.

 

Elytra

The hardened or leathery forewings of beetles used to protect the fragile hindwings, which are used for flying. Singular: elytron.

 

Femur

On insects and arachnids, the third, largest, most robust segment of the leg, coming immediately before the tibia. On humans, the thigh bone.

 

Maxillae

Paired mouth structures of arthropods located immediately behind the mandible and used for tasting and manipulating food. “Under-jaws”.

 

Palp

Short for pedipalp. A segmented, finger-like process of an arthropod; one is attached to each maxilla and two are attached to the labium. They function as sense organs in spiders and insects, and as weapons in scorpions. Plural: palpi or palps.

 

Pronotum

The exoskeletal plate on the upper side of the first segment of the thorax of an insect.

 

Punctate

Dotted with pits (punctures), translucent sunken glands, or colored spots of pigment.

 

Scutellum

The exoskeletal plate covering the rearward (posterior) part of the middle segment of the thorax in some insects. In Coleoptera, Hemiptera, and Homoptera, the dorsal, often triangular plate behind the pronotum and between the bases of the front wings. In Diptera, the exoskeletal plate between the abdomen and the thorax.

 

Tarsus

On insects, the last two to five subdivisions of the leg, attached to the tibia; the foot. On spiders, the last segment of the leg. Plural: tarsi.

 

 

 

 

 
 
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Greg Watson

 
    round-necked longhorn beetle      
           
 
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    round-necked longhorn beetle   round-necked longhorn beetle  
           
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Clytus ruricola
Andree Reno Sanborn
  Clytus ruricola  

 

slideshow

       
 
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Other Videos
 
  Round-necked Longhorn Beetles (Cerambycidae: Clytus ruricola)
Carl Barrentine
 
   
 
About

Jun 16, 2010

Photographed at the Rydell NWR, Minnesota (16 June 2010).

 
  LONGHORN BEETLE Clytus ruricola
Rob Curtis
 
   
 
About

Jul 20, 2019

Clytus ruricola CERAMBYCINAE LONGHORN BEETLE, McClaughery Springs FP, 7/3/2019

 

 

Camcorder

 
 
Visitor Sightings
 
           
 

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  Greg Watson
6/19/2023

Location: Whitewater State Park, along the Trout Run Creek Trail

round-necked longhorn beetle  
           
 
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Created: 7/1/2023

Last Updated:

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