damsel bug

(Nabis roseipennis)

               
Conservation Status

IUCN Red List

not listed

damsel bug (Nabis roseipennis)

 

NatureServe

not listed

Minnesota

not listed

Occurrence

Widespread in North America. Common in Minnesota.

Flight/Season

One generation, early May to early October

Habitat

Grassy fields, gardens, agricultural fields

Size

Total Length: about ¼

Photo by Alfredo Colon

Identification

Nabis roseipennis is a small, predatory, damsel bug. It is considered beneficial because it preys on many agricultural pests. It occurs across North America and southern Canada, but is most common fron the northeast to the Midwest.

Adults are soft-bodied, elongated, about ¼ long, slender, less than wide, and cone-shaped. They are tan and mottled with shades of reddish-brown and gray.

The head is small, cone-shaped, and much narrower than the thorax. At the front of the head there is a rounded lobe (tylus) that projects forward. The tylus is dark along the sides. The neck is very short. There are two large compound eyes and two small simple eyes (ocelli). The compound eyes are bulging and dark red. At the top of the head there are two converging pale lines with a dark, hairy, V-shaped area between them. The occelli are large and positioned at the back (posterior) ends of the pale lines. The antennae are exposed, conspicuous, and long, much longer than the head but not quite as long as the body. They have four segments. The end of the second segment is dark. The mouth parts are optimized for piercing and sucking. They take the form of a long, prominent, 4-segmented beak that extends along the underside of the body between the legs when not used. The beak is slender and much longer than the head. The abdomen is much wider than the thorax.

There are two pairs of wings, and they are held flat over the body when at rest. The forewings (hemelytra) on the mature adult are longer than the body and completely cover the sides of the body. They have a thickened section at the base and a thin membranous section at the tip with a clear dividing line between the two. The thickened basal part is comprised of a triangular section (scutellum) at the base; a narrow area (clavus) behind the scutellum when the wings are closed; and the remaining, broad, marginal area (corium). At the end of the corium there is a small but distinct triangular area (cuneus). There is one unbranched vein through the clavus, and two long veins in the corium, one of them split in the middle forming a diamond-shaped cell. A long submarginal vein in the membraneous section separates an inner row of long closed cells and an outer (marginal) row of short open cells. The hindwings are thin, membranous, and concealed under the forewings.

The legs are long, stilt-like, and yellowish-tan. The third segment (femur) and fourth segment (tibia) of each leg is heavily spotted above. The femurs on all legs have heavy dark spotting above. On the front leg they are thickened. On the front and middle legs they have a row of small, stiff bristles below. The tibia on all legs are also heavily spotted above. On the front legs they have double row of black teeth along the inner edge. On the middle legs they have a double row of black spines. The end part of the leg, corresponding to the foot, (tarsus) has only 3 segments. The tip of each segment is dark.

 
Similar
Species

 


Larval Food

 

 
Adult Food

Small insects, insect nymphs, and insect eggs, including aphids, mites, and caterpillars.

 
Life Cycle

Adults females probably overwinter after mating and deposit eggs in the spring. Nymphs pass through five stages (instars) before emerging as adults.

 
Behavior

Adults are usually found on grass or low on vegetation.


Distribution Distribution Map  

Sources: 24, 27, 29, 30.


Comments

No Common Name
This species has no common name. The common name of the Family Nabidae is damsel bugs, and is applied here for the sake of convenience.

Beneficial
Damsel bugs prey on aphids, caterpillars, and other insect nymphs and eggs, including many agricultural pests. They are considered beneficial, though they are not available commercially.


Taxonomy

Order:

Hemiptera (true bugs, cicadas, hoppers, aphids and allies)

 

No Rank:

Euhemiptera

 

No Rank:

Neohemiptera

 

No Rank:

Prosorrhyncha

 

Suborder:

Heteroptera (true bugs)

 

No Rank:

Euheteroptera

 

No Rank:

Neoheteroptera

 

No Rank:

Panheteroptera

 

Infraorder:

Cimicomorpha (thaumastocorid bugs)

 

Family:

Nabidae (damsel bugs)

 

Subfamily:

Nabinae

 

Tribe:

Nabini

 

Genus:

Nabis

 

Subgenus:

Nabis

 
Synonyms

 

 
Common
Names

no common name


 

 

 

 

 

Glossary

Beak

On plants: A comparatively short and stout, narrow or prolonged tip on a thickened organ, as on some fruits and seeds. On insects: The protruding mouthparts of a sucking insect.

 

Corium

The thickened basal portion of the front wing that lies between the clavus and the membrane of insects in the family Hemiptera.

 

Femur

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

 

Hemelytron

The forewing of true bugs (Order Hemiptera), thickened at the base and membranous at the tip. Plural: hemelytra.

 

Instar

The developmental stage of arthropods between each molt; in insects, the developmental stage of the larvae or nymph.

 

Ocellus

Simple eye; an eye with a single lens. Plural: ocelli.

 

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

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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Alfredo Colon


  damsel bug (Nabis roseipennis)    

       
       
       

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Alfredo Colon
6/10/2018

Location: Woodbury, Minnesota

damsel bug (Nabis roseipennis)


     
     
 

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