stout spanworm moth

(Lycia ursaria)

               
Hodges #

6651

stout spanworm moth

 

Conservation Status

IUCN Red List

not listed

NatureServe

NNR - Unranked

Minnesota

not listed

Occurrence

Locally common

Flight/Season

One generation per year: Early April to late May

Habitat

Deciduous and mixed woodlands

Size

Wingspan: 13 16 to 1¾ (30 to 45 mm)

Photo by Alfredo Colon
 
Identification

Stout spanworm moth is a medium-sized, broad-winged, very hairy, typical geometer moth. It occurs in the northern United States and southern Canada from coast to coast. Its distribution is patchy and it is common at some locations (locally common).

Adults have a wingspan of 13 16 to 1¾ (30 to 45 mm). Males have plume-like antennae and broad wings. Females have thread-like antennae. Their wings are smaller than the male’s and they cannot fly. The thorax and abdomen are extremely hairy. The forewing is gray with fine black speckling (peppery); black antemedial (AM), median, and postmedial (PM) lines; and a white subterminal line. The hindwing is similar but the markings are muted.

The caterpillar is up to 19 16 (4 cm) long and, as the common name suggests, is stout. It is pinkish and has many fine, wavy, longitudinal, black stripes. It has yellow breathing pores (spiracles); yellow, round warts above the spiracles (supraspiracular area); and yellow, dash-like warts above on each side (subdorsal area). The legs and the head are reddish.

 
Similar
Species

 

 
Larval Food

Leaves of deciduous trees and woody plants, including alder, apple, ash, basswood, birch, blueberry, cherry, cranberry, dogwood, elm, hawthorn, maple, poplar, and willow.

 
Adult Food

 

 
Life Cycle

Eggs are laid under bark. The pupa overwinters.

 
Behavior

Males are active at night and will come to lights. Females cannot fly. Wings are held flat when at rest.

 
Distribution Distribution Map  

Sources: 21, 24, 29, 30, 75.

 
Comments

 

 
Taxonomy

Order:

Lepidoptera (butterflies and moths)

 

Suborder:

Glossata

 

Infraorder:

Neolepidoptera

 

Parvorder:

Heteroneura

 

No Rank:

Ditrysia

 

No Rank:

Obtectomera

 

Superfamily:

Geometroidea (inchworm moths)

 

Family:

Geometridae (geometer moths)

 

Subfamily:

Ennominae (typical geometers)

 

Tribe:

Bistonini

 
Synonyms

 

 
Common
Names

stout spanworm

stout spanworm moth

 

 

 

 

 

Glossary

Antemedial line

A thin line separating the basal area and the median area of the forewing of Lepidoptera.

 

Spiracle

A small opening on the surface of an insect through which the insect breathes.

 

 

 

 

 

       
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Alfredo Colon
       
  stout spanworm moth   stout spanworm moth
       
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Alfredo Colon
Summer 2018

Location: Woodbury, MN

stout spanworm moth


     
     
 
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Created: 11/10/2019

Last Updated:

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