Maevia

C. L. Koch, 1846

Dimorphic Jumping Spider (M. inclemens)

Species Guides

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Maevia is a of jumping spiders (Salticidae) historically encompassing from both the New World and Asia. The genus has undergone significant taxonomic revision, with most Asian species transferred to other genera. The best-studied species, M. inclemens, exhibits remarkable male dimorphism with two distinct morphs differing in appearance and courtship .

Maevia by (c) David Hill, some rights reserved (CC BY). Used under a CC-BY license.Maevia inclemens by no rights reserved, uploaded by spidereyes. Used under a CC0 license.Maevia inclemens by (c) Matthew Lindsey, some rights reserved (CC BY), uploaded by Matthew Lindsey. Used under a CC-BY license.

Pronunciation

How to pronounce Maevia: /ˈmeɪ.vi.a/

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Identification

Males of M. inclemens occur in two distinct forms: the 'tufted form' is all-black with white legs and a triple tuft of setae on the ; the 'gray form' has black pinstripes with orange spots and chevrons. Females are consistently pale with orange or red longitudinal stripes on the . Body length ranges 4.8–7.0 mm (males) and 6.5–10 mm (females). Other in the lack documented diagnostic features.

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Habitat

in this occupy understory vegetation, walls, fences, and human structures. M. inclemens is frequently found in wooded areas, on building exteriors, and occasionally enters homes.

Distribution

New World occur in the United States, Canada, and Peru. Asian species are recorded from Sumatra, though several lack recent documentation.

Diet

M. inclemens feeds primarily on insects and has been observed consuming nectar from extrafloral of Prunus shrubs. Diet of other is undocumented.

Behavior

M. inclemens males perform complex visual that differ between morphs: tufted-form males stand elevated with dipped, waving front legs overhead; gray-form males adopt a low posture and sidle. Females possess distinct recognition templates for each morph's display. Both morphs produce signals that result in nearly identical visual target area to females at different distances.

Ecological Role

As jumping spiders, they function as visual in understory and building-associated . Occasional nectar consumption may contribute to pollination dynamics.

Human Relevance

M. inclemens is among the most commonly encountered jumping spiders in the eastern United States. Its distinctive male dimorphism makes it a subject of behavioral research and public interest. Occasionally enters homes but poses no threat.

Similar Taxa

  • Other SalticidaeMale dimorphism in M. inclemens is unique among jumping spiders; other lack this specific combination of discrete morphological and behavioral alternatives.

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