flower weevil

(Madarellus undulatus)

               
Conservation Status

IUCN Red List

not listed

Alfredo Colon

NatureServe

NNR - Unranked

Minnesota

not listed

Occurrence

Uncommon in Minnesota

Flight/Season

April to late September (CCESR)

Habitat/Hosts

Savannas. Grape, Virginia creeper, woodbine, and eastern poison ivy.

Size

Total Length: to 316 (2.6 to 4.7 mm)

         
         
         
          Photo by Alfredo Colon
 
Identification

Madarellus undulatus is a small, shiny, black and red, flower weevil. It occurs in North America from Nova Scotia to Florida west to South Dakota and Texas. It is uncommon in Minnesota. It feeds on grape, Virginia creeper, woodbine, and eastern poison ivy.

Adults are to 316 (2.6 to 4.7 mm) and inversely egg-shaped, widest toward the front and directed downward toward the narrow rear. It has neither scales nor hairs (setae).

The head is red and is greatly elongated between the eyes and the mouth parts forming a conspicuous snout (rostrum). The rostrum is well-developed, narrow, and very long, one-fourth the length of the entire body. It is projected forward and slightly bent downward. It is mostly black, red just at the base. The sides are coarsely pitted (punctured), the top finely punctured. The antennae are short, slender, and elbowed. They have 11 segments. The last 3 segments are expanded and form a club.

The thorax is composed of three segments. The first segment (prothorax) is large and prominent and appears to be the entire thorax. It is covered by a saddle-shaped plate (pronotum). The pronotum is rectangular and twice as wide as long, much wider than the head. It is shiny and usually red, sometimes dark red, occasionally black. The sides are broadly rounded but abruptly constricted just behind the head. The surface is sparsely punctured.

There are two pairs of wings, a membranous inner pair and a hardened outer pair (elytra). The elytra are attached to the second thoracic segment (mesothorax). They cover the mesothorax, the third thoracic segment (metathorax), and completely cover the abdomen. They are slightly narrower than the pronotum, narrowed toward the tips and constricted just behind the pronotum. They are slightly constricted in the middle, making them appear wavy when viewed from above. They are black, narrowly grooved (striate), and have narrow rows of deep punctures. Toward the inner margin, the spaces between the deep punctures is flat, smooth, and sparsely covered with fine punctures. Toward the sides these spaces are rougher.

There is a small plate (mesepimeron [=mesepisternum?]) on each side between the pronotum and the elytra in the shoulder area. The mesepimeron is raised and is visible from above. This is an identifying feature of the subfamily Baridinae.

The legs are black and densely covered with large punctures. The last part of each leg (tarsus), corresponding to the foot, has five segments but the first segment is minute and is concealed within the extended lobes of the third segment, making it appear that there are only four segments. At the end of each tarsus there are two hooked claws.

 
Similar
Species

 

 
Larval Food

Grape, Virginia creeper, woodbine, and eastern poison ivy

 
Adult Food

Grape, Virginia creeper, woodbine, and eastern poison ivy

 
Life Cycle

 

 
Behavior

 

 
Distribution Distribution Map  

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

 
Comments

 

 
Taxonomy

Order:

Coleoptera (beetles)

 

Suborder:

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

 

Infraorder:

Cucujiformia

 

Superfamily:

Curculionoidea (snout and bark beetles)

 

Family:

Curculionidae (snout beetles, weevils)

 

Subfamily:

Baridinae (flower weevils)

 

Tribe:

Madarini

 

Genus:

Madarellus

 
Synonyms

 

 
Common
Names

This species has no common name. The common names of the subfamily Baridinae is flower weevils, and is applied here for convenience.

 

 

 

 

 

 

 

Glossary

Elytra

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

 

Pronotum

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

 

Prothorax

The first (forward) segment of the thorax on an insect, bearing the first pair of legs but not wings.

 

Rostrum

The stiff, beak-like projection of the carapace or prolongation of the head of an insect, crustacean, or cetacean.

 

Seta

A stiff, hair-like process on the outer surface of an organism. In Lepidoptera: A usually rigid bristle- or hair-like outgrowth used to sense touch. In mosses:The stalk supporting a spore-bearing capsule and supplying it with nutrients. Plural: setae.

 

 

 

 

 

       
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Alfredo Colon
       
  flower weevil (Madarellus undulatus)    
       
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Alfredo Colon
8/13/2019

Location: Woodbury, Minnesota

flower weevil (Madarellus undulatus)


     
     
 
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Created: 10/19/2020

Last Updated:

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