ant-mimicking jumping spider

(Synemosyna formica)

               
Conservation Status

IUCN Red List

not yet assessed

ant-mimicking jumping spider

NatureServe

NNR - Unranked

Minnesota

not listed

Occurrence

 

Season

 

Habitat/Host

Bushes and tall grass

Size

Female Body Length: 3 16 to ¼

Male Body Length: to 3 16

          Photo by Terry Hayes

Identification

The front body part of the body (cephalothorax) has a relatively sharp downward slope between the head portion and the thorax portion. The rear portion of the cephalothorax is narrow and has parallel sides. It appears to be part of the pedicel.

The abdomen is constricted, an evolutionary modification to mimic ants. There are white marks at the constriction on dark individuals, pale marks on light individuals.

The legs have no prominent spines. The front legs are curved, mimicking ant antennae.

On the copulatory organs of the male (palpal bulbs) the embolus is fixed to the tegulum.

There are four pairs of eyes arranged in three rows. The front middle (anterior median) pair is by far the largest. The rear two pair form a square.

 
Similar
Species

 


Food

 

 
Life Cycle

The ant-mimicking jumping spider is prey for the very ants that it mimics, yet it builds its nest in close proximity to an ant nest. It constructs a very tough nest that the ants cannot penetrate. The odor of the nearby ant nest keeps predators away from the spider nest.

 
Behavior

Movements by the spider keep ants at an acceptable distance.


Distribution Distribution Map   Sources: 24, 27.

Comments

Batesian Mimic
The ant-mimicking jumping spider is a Batesian mimic. It has evolved to imitate the appearance of ants which are avoided by mantises, ants, and larger jumping spiders.


Taxonomy

Order:

Araneae (spiders)

 

Suborder:

Araneomorphae

 

No Rank:

Entelegynae (eight-eyed spiders)

 

No Rank:

RTA clade

 

No Rank:

Dionycha

 

Family:

Salticidae (jumping spiders)

 

no rank:

Salticoida

 

no rank:

Amycoida

 

Subfamily:

Synemosyninae

 
Synonyms

 

 
Common
Names

ant-mimicking jumping spider


 

 

 

 

 

Glossary

cephalothorax

The front part of a spider’s body, composed of the head region and the thoracic area fused together. Eyes, legs, and antennae are attached to this part.

 

pedicel

In plants: the stalk of a single flower in a cluster of flowers. In Hymenoptera and Araneae: the narrow stalk connecting the thorax to the abdomen.

 

 

       

Visitor Photos

   
Share your photo of this arachnid.

Terry Hayes


Hi, I see you could use a few more spider pictures on your website. I have a lot of jumping spider pix, but this ant mimic spider is something new to me. I've seen three of them in my yard in Montrose MN.

  ant-mimicking jumping spider    

       
       

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  jumping spider (Synemosyna formica)
Bill Keim
 
  jumping spider (Synemosyna formica)  

 

slideshow

     

Visitor Videos

   
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Other Videos

 
  Synemosyna formica (ant mimic) - Jumping Spider
Dick Walton
 
   
 
About

Uploaded on Nov 26, 2010

female Synemosyna formica jumping spider; this ant mimic is shown preparing a leaf for a shelter

 
     
  Antlike Jumping Spider Synemosyna formica
Spiderville Kentucky
 
   
 
About

Published on Apr 27, 2015

Jumping spider

 
     

 

Camcorder

         

Visitor Sightings

   
Share your sighting of this arachnid.

Terry Hayes
10/4/2015

Location: Montrose MN

Hi, I see you could use a few more spider pictures on your website. I have a lot of jumping spider pix, but this ant mimic spider is something new to me. I've seen three of them in my yard in Montrose MN.

ant-mimicking jumping spider


     
     
 

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