Their abdomens lack spines and are instead simply elongated and dark. They are much smaller and do not spin webs. The carapace is amber, and the legs are glossy black. The ten-spined, chunky abdomen sets the female spined micrathena apart from all other spiders. Its colors vary from whitish to yellowish, mottled with black or brown. Spined micrathena is also referred to as castleback orbweaver. Females can grow up to 10 mm while males are quite small, reaching 5 mm at most. They have the ability to change between these colors based on their surroundings through the molting process. They may also present with pale green or pink instead of yellow, again, in a pattern with white. Goldenrod crab spider are usually yellow or white or a pattern of these two colors. They are called crab spiders because of their unique ability to walk sideways as well as forwards and backwards. They have six pointed abdominal projections frequently referred to as “spines.” The carapace, legs, and venter are black, with some white spots on the underside of the abdomen. Males are much smaller than females, 2 to 3 mm long, and slightly longer than wide. Spiny-backed orb-weavers are sometimes colloquially called “crab spiders” because of their shape.
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