late long-horned caddisfly

(Triaenodes tardus)

Conservation Status
late long-horned caddisfly
Photo by Alfredo Colon
  IUCN Red List

not listed

     
  NatureServe

N4N5 - Apparently Secure to Secure

SNR - Unranked

     
  Minnesota

not listed

     
           
           
 
Description
 
 

Late long-horned caddisfly is common small caddisfly. It occurs in North America mostly in the east and in the Pacific Northwest. In the United States it occurs from Maine and North Dakota south to Ohio and Kansas, and from Washington to northern California, with scattered records in between and in the south. It is common in Minnesota, where it is the second most widespread caddisfly species. Global Biodiversity Information Facility (GBIF) shows more records from Minnesota by far than from any other U.S. state or Canadian province. Larvae eat living plant material. They are found in the beds of submerged aquatic plants, both in the still water of wetlands and along the shores of lakes and ponds, and in the fast moving water of rivers and streams. Adults do not feed. They are usually found near the aquatic habitat of the larvae, but may wander up to several miles. They are active at night (nocturnal) and at dusk and dawn (crepuscular). They are attracted to light.

Adults are slender and 516 to ½ (8 to 12 mm) in length.

There are two compound eyes but no simple eyes (ocelli). The antennae are pale, thread-like, and long, more than twice as long as the forewings. On the first quarter of each antenna there is a dark brown band at the base of each segment. The mouth parts are reduced but the finger-like sensory organs attached to the mouth (maxillary palps) are well developed. On both sexes they have 5 segments. The last segment is not much longer than the other segments and does not have horizontal grooves.

The thorax has three exoskeletal plates above. The plate covering the first segment (pronotum) has a pair of warts separated be a deep notch. The plate covering the second segment (mesoscutum) has two irregular rows of closely spaced bristly spots.

There are 4 membranous wings. The hindwings are a little shorter than the forewings. The forewings are light brown with dark brown markings on the outer third. When the wings are at rest they are held roof-like over the body and the dark brown areas of each wing meet in the middle. No hairs on the forewings have an enlarged or swollen tip (clubbed). The median vein (M) has 4 branches on the forewing, 3 branches on the hindwing. The cubitus vein (Cu) on each wing has 3 branches. There is a small spot on each wing in the fork of the fourth and fifth branch of the radius vein (R4+5).

The legs are relatively long and slender. The fourth segment (tibia) of the middle leg does not have a row of spurs near the tip but does have a row of black spines. The last part of the leg (tarsus), corresponding to the foot, has 5 segments. At the end of each tarsus there is a pair of claws. The claws on the middle and hind legs are equal in length.

The larva is similar in appearance to a caterpillar. It constructs a portable protective tube up to 1516 (33 mm) long in which it lives. The tube is made of plant pieces arranged in a spiral pattern.

 
     
 

Size

 
 

Total Length: 516 to ½ (8 to 12 mm)

 
     
 

Similar Species

 
     
     
 
Habitat
 
 

Lakes, streams, rivers, and wetlands; all habitat types.

 
     
 
Biology
 
 

Season

 
 

One generation per year: May through September

 
     
 

Behavior

 
 

Adults are active at night (nocturnal) and at dusk and dawn (crepuscular). They are attracted to light.

 
     
 

Life Cycle

 
 

The female lays a flat oval mass of eggs.

 
     
 

Larva Food

 
 

Plant fragments

 
     
 

Adult Food

 
 

 

 
     
 
Distribution
 
 

Distribution Map

 

Sources

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

 
  11/30/2020      
         
 

Occurrence

 
 

Common and widespread in Minnesota

 
         
 
Taxonomy
 
 

Order

Trichoptera (caddisflies)  
 

Suborder

Integripalpia  
 

Infraorder

Brevitentoria  
 

Superfamily

Leptoceroidea  
 

Family

Leptoceridae (long-horned caddisflies)  
 

Subfamily

Leptocerinae  
 

Tribe

Triaenodini  
 

Genus

Triaenodes  
       
 

Synonyms

 
 

Triaenodes marginata tarda

Triaenodes mephitus

Triaenodes tarda

 
       
 

Common Names

 
 

late long-horned caddisfly

 
       

 

 

 

 

 

 

 

Glossary

Maxillae

Paired mouth structures of arthropods located immediately behind the mandible and used for tasting and manipulating food.

 

Ocellus

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

 

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

 

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.

 

Tibia

The fourth segment of an insect leg, after the femur and before the tarsus (foot). The fifth segment of a spider leg or palp.

 

 

 

 

 

       
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Alfredo Colon
       
  late long-horned caddisfly    
       
       
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Alfredo Colon
8/15/2019

Location: Woodbury, MN

late long-horned caddisfly


     
     
 
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Created: 12/1/2020

Last Updated:

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