Misumena

Latreille, 1804

Flower Crab Spiders

Misumena is a of crab in the Thomisidae, commonly known as flower crab spiders. The genus contains approximately 40 distributed across the Northern Hemisphere, with the most well-known species being Misumena vatia, the goldenrod crab spider. These spiders are ambush that hunt on flowers, where they rely on to capture pollinating . Some species, particularly females of M. vatia, exhibit remarkable color-changing abilities, shifting between and to match their floral substrate.

Spider and bee June 2008-1 by Alvesgaspar. Used under a CC BY-SA 4.0 license.

Crab spider (Misumena Vatia) with prey silver-spotted skipper (Hesperia comma) by Charles J. Sharp
. Used under a CC BY-SA 4.0 license.

Thomise 3 by Luc Viatour. Used under a CC BY-SA 3.0 license.

Pronunciation

How to pronounce Misumena: /mɪˈsuːmɛnə/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

Distinguished from similar Misumenoides and Mecaphesa (also Thomisidae) by subtle morphological differences in arrangement, leg spination, and structure. Accurate identification to level typically requires examination of reproductive structures. M. vatia is recognizable by its color-changing ability and association with composite flowers such as goldenrod (Solidago).

Images

Habitat

Primarily associated with flowering plants where they serve as ambush . Found in meadows, gardens, agricultural fields, and open woodlands with abundant floral resources. spiderlings show preference for leafy stems over flowering stems, while select high-quality umbels or with abundant .

Distribution

Widespread across the Northern Hemisphere including North America, Eurasia, and northern Africa. Individual have more restricted ranges; M. vatia occurs across North America and Eurasia, while M. bicolor has been documented from Corsica, Sardinia, Germany, and mainland France.

Seasonality

females are most commonly observed during late spring through autumn when floral resources are abundant. Males mature earlier than females and wander in search of mates. In temperate regions, peak activity coincides with peak flowering of preferred plants such as goldenrod in late summer and early autumn.

Diet

Active of pollinating including , , , and other flower-visiting . Documented includes (), various butterfly including Chryxus (Oeneis sp.), and other hymenopterans. Males of M. vatia have been observed feeding on flower pollen and nectar, though this is supplemental rather than primary nutrition.

Life Cycle

Females produce sacs typically wrapped in folded leaves, which they guard until spiderlings emerge and disperse. Spiderlings are capable of ballooning for , making them more mobile than females. Development includes egg, spiderling, and adult stages with multiple molts. Females invest heavily in , with eggs accounting for approximately 85% of body weight gain after maturity.

Behavior

Ambush that rely on and patience rather than web-building or active pursuit. Position themselves on flowers and wait for to come within striking distance. Use legs to seize prey and deliver venomous bite. females are relatively sedentary, occupying high-quality floral for extended periods. Males are wanderers that search for females. Spiderlings exhibit patch-choice , selecting stems based on leaf availability and shelter.

Ecological Role

Important of in floral . May influence pollinator and -pollinator interactions through risk. Serve as for birds and other . Their presence on flowers creates a complex ecological interaction involving predator-prey dynamics, plant , and pollinator foraging decisions.

Human Relevance

Generally in gardens and agricultural settings due to on potential pest such as some and small . Occasionally encountered by gardeners and naturalists on flowers. Subject of extensive scientific research due to their color-changing ability, foraging , and reproductive . Not considered medically significant to humans.

Similar Taxa

MisumenoidesSimilar body form and flower-associated ; distinguished by subtle differences in arrangement and genital
MecaphesaOverlapping use and general appearance; requires detailed morphological examination for reliable separation
ThomisusRelated of crab with similar ambush hunting strategy on flowers; some show convergent color-changing abilities

More Details

Color Change Mechanism

The color change in M. vatia is induced by visual feedback; with painted lose this ability. pigment is secreted into outer layers and can be transported downward to reveal guanine-filled inner glands, or excreted to revert to white base coloration.

Scientific Study

Misumena vatia is among the most intensively studied , with research spanning -choice , foraging , reproductive biology, and - dynamics. An entire book has been published on its : 'Predator Upon a Flower: and in a Crab Spider' by Douglass Morse (2007).