Maevia Inclemens – Dimorphic Jumper

Maevia inclemens, commonly called dimorphic jumper is a species of jumping spiders mainly found in the Eastern U.S States and Southeastern Canada. Its common name comes from the fact that there are two types of males that differ in appearance and behavior – so called morphs.

Dimorphic Jumper Description

As mentioned, the male dimorphic jumper comes in two forms (or morphs): the dark morph with a completely black abdomen and cephalothorax and white legs.

Dark morph dimorphic jumping spider
A dark morph seen in Bellavista, Arkansas by Julie

The grey morph has grey and white stripes along its body and legs. It is therefore sometimes confused with the grey wall jumper or the zebra jumping spider. However, the grey morph of maevia inclemens can be identified by its bright orange pedipalps which doesn’t occur in the other two species.

Dimoprphic jumper grey morph
The orange pedipalps are the distinctive mark of the grey morph. Photo: Wikipedia

Around 50% of all males are dark morphs while the other 50% are grey morphs.

The female maevia clemens has a brown body and legs with white and red markings on the back of its abdomen.

Maevia inclemens jumping spider
Female Maevia inclemens jumping spider. Photo: Wikipedia

Size

The dimorphic jumper is, like other jumping spiders, a rather small spider. They reach a size of 0.2-0.3 inches (0.5-1.0cm). Females are around 20% larger than males.

Web

Like all jumpings spiders, the dimorphic jumper is a hunting spider and doesn’t spin a web to catch prey. It only uses its absility to create silk to drag a safety line for dangerous jumps. In case the jump goes wrong, the spider will be stopped by the silk string.

Bite

A maevia inclemens bite is not dangerous for humans. They are also very shy and incredibly fast spiders – so it is unlikely to be bitten by one. In case a bite occurs, minor swellings can be expected. The level of pain is much less than that of a bee sting.

Scientific Classification of Maevia inclemens

  • Kingdom: Animalia
  • Phylum: Arthropoda
  • Subphylum: Chelicerata
  • Class: Arachnida
  • Order: Araneae
  • Infraorder: Araneomorphae
  • Family: Salticidae
  • Genus: Maevia
  • Species: Meavia inclemens

Common Names

Dimorphic jumper or dimorphic jumping spider.

Distribution of the dimorphic jumping spider in the USA

The dimorphic jumper is a quite common species throughout the Eastern United States and is mostly found in the followin states: Alabama, Arkansas, Connecticut, Delaware, Florida, Georgia, Illinois, Indiana, Iowa, Kansas, Kentucky, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, New Hampshire, New Jersey, New York, North Carolina, Ohio, Pennsylvania, Rhode Island, South Carolina, Tennessee, Vermont, Virginia, West Virginia, Wisconsin

Maevia Inclemens – Dimorphic Jumper

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