Attention Deficit Disorder Prosthetic Memory Program

Maratus Spider

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Maratus Spider - © Attention Deficit Disorder Prosthetic Memory Program

Maratus volans is a species in the jumping spider family (Salticidae), belonging to the genus Maratus (peacock spiders).Both sexes reach about 5 mm in body length. Females and immatures of both sexes are brown but have color patterns by which they can be distinguished from related species. Also, the males dance to attract females.

The red, blue and black colored males have flap-like extensions of the abdomen with white hairs that can be folded down. They are used for display during mating: the male raises his abdomen, then expands and raises the flaps so that the abdomen forms a white-fringed, circular field of color. The species, and indeed the whole genus Maratus have been compared to peacocks in this respect. The third pair of legs is also raised for display, showing a brush of black hairs and white tips. These legs are also used in a clapping motion to further attract a female’s attention. While approaching the female, the male vibrates his abdomen while waving raised legs and tail, and dances from side to side.

If the male continues his dance when the female is not interested, she attempts to attack, kill, and feed on him; she may also do this after mating (sexual cannibalism). The male may escape by jumping. The behavior of the female M. volans suggests why the males have developed unique sexual dimorphic features and courtship behavior.

M. volans use their colorful opisthosomal flaps to gain the attention of the female. Much of the mating ritual consists however of waving and vibrating the third legs, for between four and fifty-minutes. Jakob Bro-Jergensen states that “When both sexes are allowed to respond optimally by introducing adaptive dynamics to a standard runaway model of condition dependent signaling, multiple signals can coexist even if the signal preferences entail significant costs”. He explains that the potential sexual success outweighs the relatively low costs of the mating ritual. The mating behaviour of M. volans is an example of runaway sexual selection where the male risks death in attempting to mate.

Peacock spiders are diurnal cursorial hunters feeding primarily on insects and other spiders. The evolution of an acute visual system in salticids almost certainly originated as an adaptation for stalking prey. However, this development also facilitated a wandering lifestyle different from that of their sit-and-wait ancestors, enabling jumping spiders to roam and encounter many environments. Keen eyesight has probably been useful for peacock spiders in navigating, inhabiting and exploiting new types of habitats, and undoubtedly set the stage for the evolution of complex visual signals.

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