nightcrawler

(Lumbricus terrestris)

               
Conservation Status

IUCN Red List

not listed

nightcrawler

NatureServe

NNA - Not applicable

Minnesota

not listed

Occurrence

Common

Habitat

 

Size

Total Length: 4¼ to 8

    Photo by Alfredo Colon
 
Identification

Earthworms are terrestrial, tube-shaped, segmented animals. They are not native to Minnesota. If they ever were, they did not survive the last period of glaciation that ended 11,700 years ago. We do not know if they ever occurred in Minnesota because, having neither an internal skeleton nor an exoskeleton, their bodies do not fossilize. There are at least fifteen species of earthworms found in Minnesota. All of them were imported from Europe and Asia.

Nightcrawler is a common, large earthworm. It is native to western Europe but is now widely distributed throughout the temperate and mildly boreal regions of the world. It is considered invasive outside of its native range, including in Minnesota. Its spread is attributed to human activities, including the movement of soil as ship’s ballast, importation of exotic plants, and disposal of fish bait. It is not the most abundant earthworm in Minnesota but it is the most often encountered.

The body is cylindrical, 4¼ to 8 long, and stout, often as thick as a pencil. It is pointed in the front, broad and flattened at the rear. There is no head. The front end, referred to as the head end, is dark brown to reddish-brown, darker in front and fading to the rear. The tail end is light reddish-brown. The dark blood vessel can be seen through the body wall at the upper middle (middorsal) part of the tail end.

The body is divided into 120 to 170 segments. Each segment has four pairs of chitinous bristles (chaetae), a lateral pair and a lower (ventral) pair on each side. The chaetae are not visible without strong magnification. They are used to hold parts of the worm in place as other parts elongate, enabling controlled movement. For identification purposes, the four chaetae on each side are referred to as chaeta A, chaeta B, chaeta C, and chaeta D. The distance between C and D is slightly less than between A and B.

The first body segment contains the mouth and a fleshy lobe (prostomium) that covers the mouth when at rest. The prostomium contains chemical receptors that function as sensory organs. It is prehensile and can be used to grab an item, such as a grass leaf, and pull it into the worm’s burrow. There are two small furrows on the upper (dorsal) side that reach the boundary between the first and second segments.

Separating the head and tail ends there is a thick, differently colored, saddle-like ring (clitellum) around segments 32 through 37. The clitellum is unsegmented but has six rounded lobes corresponding to the underlying segments. It is used to store the worm’s eggs.

Like all earthworms, nightcrawlers have both male and female reproductive organs (hermaphroditic). The male pore, from which sperm is expelled, is on a prominent pad on segment 15. The female pore, from which eggs are released, is on segment 14.

 
Similar
Species

 

 
Food

Leaf litter

 
Life Cycle

Nightcrawlers copulate on the soil surface at night.

 
Behavior

They burrow 1 to 2 meters deep into the soil where they spend the day. They come to the surface at night to feed on leaf litter.

 
Distribution Distribution Map  

Sources: 4, 7, 24, 29, 30.

 
Comments

Fish Bait
Nightcrawler is a favorite fish bait due to its large size.

 
Taxonomy

Phylum:

Annelida (annelids)

 

Class:

Clitellata

 

Subclass:

Oligochaeta (earthworms)

 

Superorder:

Metagynophora

 

Order:

Haplotaxida

 

Suborder:

Lumbricina (earthworms)

 

Superfamily:

Lumbricoidea

 

Family:

Lumbricidae (earthworms)

 

Subfamily:

Lumbricinae

 
Synonyms

 

 
Common
Names

common earthworm (Britain)

dew worm (Canada)

lob worm (Britain)

nightcrawler (United States)

 

 

 

 

 

       
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Alfredo Colon
       
  nightcrawler    
       
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Important info from wiki:
In parts of Europe, notably the Atlantic fringe of northwestern Europe, it is now locally endangered due to predation by the New Zealand flatworm (Arthurdendyus triangulatus) and the Australian flatworm (Australoplana sanguinea), two predatory flatworms accidentally introduced from New Zealand and Australia. These predators are very efficient earthworm eaters, being able to survive for lengthy periods with no food, so still persist even when their prey has dropped to unsustainably low populations. In some areas, this is having a seriously adverse effect on the soil structure and quality. The soil aeration and organic material mixing previously done by the earthworms has ceased in some areas.

   
       
  How To Identify Canadian Nightcrawlers Lumbricus Terrestris
Pauly Piccirillo
 
   
 
About

Aug 13, 2015

http://www.wormfarmingrevealed.com/

Learn how to identify Canadian Nightcrawlers easily. With just a quick look and ability to identify a few key features you'll know beyond a shadow of a doubt if you have a Canadian Nightcrawler (Lumbricus Terrestris) or not.

   
       

 

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Alfredo Colon
6/17/2018

Location: Woodbury, Minnesota

nightcrawler


     
     
 
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Created: 10/20/2019

Last Updated:

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