slender flower longhorn beetle

(Strangalia famelica solitaria)

               
Conservation Status

IUCN Red List

not listed

slender flower longhorn beetle

NatureServe

NNR - Unranked

Minnesota

not listed

Occurrence

 

Flight/Season

May to July

Habitat

Woodlands

Size

Total Length: to (10 to 17 mm)

          Photo by Brent Haglund
 
Identification

Slender flower longhorn beetle is medium-sized flower longhorn beetle. It occurs in the United States east of the Great Plains. In Minnesota it occurs in the southern half of the state, where it is at the northwest extent of its range. Larvae feed on dead and decaying hardwood, including birch and oak. Adults feed on the nectar of a variety of flowers including meadowsweet, dogwood, New Jersey tea, hydrangea, Queen Anne’s lace, and rose.

Adults are to (10 to 17 mm) long. Males are slightly smaller and more slender than females. The body is slender and strongly tapered to the rear. The last segment of the abdomen is long, expanded, and notched underneath. On the female it is reddish-black. On the male it is black, more expanded, and more deeply notched.

The head is angled forward in front and is abruptly constricted in back forming a neck that is visible when viewed from above. It is mostly black except for the yellow mouth parts. The compound eyes are large, black, and deeply notched. The antennae are thread-like, slender, entirely black, and long, about as long as the body. The base of each antenna is inserted in the notch in the compound eye. The first five antennal segments are densely covered with short, bristle-like hairs. All segments are uniformly slender. The third segment is much longer than the first (scape), the fourth is shorter than the third, and the fifth is longer than the fourth. The neck is yellow and has two black longitudinal stripes.

The upper thoracic shield (pronotum) is bell-shaped and sinuate, narrow at the front, widening to the middle, narrowing just beyond the middle, then widening to the base. It is as wide at the base as the base of the hardened wing covers (elytra), and as long as the base is wide. It is slightly inflated (arched) on top (dorsally). It has a shallow impression in the middle near the base. The angles at the rear (posterior) corners of the pronotum are very sharp and point outward. The pronotal surface is densely covered with fine pits. It is also densely covered with short, gold and dark hairs. It may be yellow with two black longitudinal stripes that do not quite reach the base. It may also be entirely black.

The hardened wing covers (elytra) are long and narrow, about 3 times as long as wide. They taper evenly from the broad base to the narrow tip, making the body appear broad-shouldered. They are yellow with a variable amount of black marks. There is a black round spot near the middle (median spot) and a black elongated spot behind the median spot. The median spot is sometimes faded, sometimes absent. The inner margins (suture) and outer margins are narrowly black. The elytral surface is finely pitted and moderately covered with short gold and dark hairs.

The legs are slender, mostly yellow, and densely covered with fine hairs. The fourth segment (tibia) has a spur at the tip. On the male the third segment (femur) of the hind leg is black on the outer (distal) half. The tibia on the hind leg is ridged along the inside. On the female the femur is black just at the tip and the tibia is not ridged. The last part of each leg (tarsus), corresponding to the foot, is black. It has five segments but the first segment is minute, making it appear that there are only four segments. On the hind leg, the tarsi are slender. The first segment is as long as all of the remaining segments together. The third segment is split beyond the middle.

 
Similar
Species

 

 
Larval Food

Decaying hardwoods, including birch and oak

 
Adult Food

Nectar of a wide variety of flowers including meadowsweet, dogwood, New Jersey tea, hydrangea, Queen Anne’s lace, and rose.

 
Life Cycle

 

 
Behavior

 

 
Distribution Distribution Map  

Sources: 24, 27, 29, 30, 82, 83.

 
Comments

Subspecies
There are two subspecies of slender flower longhorn beetle. Strangalia famelica famelica occurs east of the Appalachian Mountains, S. f. solitaria occurs west of the Appalachians.

 
Taxonomy

Order:

Coleoptera (beetles)

 

Suborder:

Polyphaga (water, rove, scarab, longhorn, leaf and snout beetles)

 

Infraorder:

Cucujiformia

 

Superfamily:

Chrysomeloidea (long-horned and leaf beetles)

 

Family:

Cerambycidae (long-horned beetles)

 

Subfamily:

Lepturinae (flower long-horned beetles)

 

Tribe:

Lepturini

 

Genus:

Strangalia

 
Synonyms

 

 
Common
Names

slender flower longhorn beetle

 

 

 

 

 

Glossary

Elytra

The hardened forewings on an insect used to protect the fragile hindwings, which are used for flying, in beetles and true bugs.

 

Femur

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

 

Pronotum

The saddle-shaped, exoskeletal plate on the upper side of the first segment of the thorax of an insect.

 

Tarsus

The last two to five subdivisions of an insect’s leg, attached to the tibia; the foot. Plural: tarsi.

 

Tibia

The fourth segment of an insect leg, after the femur and before the tarsus (foot).

 

 

 

 

 

       
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Brent Haglund
       
  slender flower longhorn beetle    
       
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Brent Haglund
6/13/2020

Location: Sibley State Park, New London, MN

slender flower longhorn beetle


     
     
 
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Created: 7/12/2020

Last Updated:

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