Identification
The *Thomisus citrinellus* is a visual marvel of the crab spider family (Thomisidae). Females are the stars of the show, reaching 6–8mm with a robust, crab-like stance. Look for two distinct, pointed "horns" or tubercles on the upper corners of the carapace—a signature field mark. Their abdomen is uniquely triangular, often widening toward the rear with distinct lateral ridges. While their base color is typically a vibrant lemon yellow or creamy white, they can exhibit subtle pink or green hues. Males are significantly smaller (approx. 2–3mm) and darker, often appearing reddish-brown, making them look like an entirely different species to the untrained eye.
Habitat & Range
This species thrives in the sun-drenched landscapes of the Mediterranean, Africa, and parts of the Middle East. You’ll find them in flower-rich meadows, scrublands, and domestic gardens. They are strictly "flower-dwellers," favoring yellow or white blossoms (like Asteraceae) where their camouflage is most effective. They rarely venture into dense forests, preferring open, airy environments where pollinators are abundant.
Behaviour
Observing a *T. citrinellus* requires patience; they are the ultimate "sit-and-wait" predators. Unlike web-weavers, they remain motionless for hours, front legs spread wide in a welcoming—yet deadly—embrace. They are solitary and highly territorial over a "prime" flower. During mating, the tiny male must cautiously approach the female, often "tethering" her with silk to avoid being eaten before he can retreat.
Diet
These spiders are the "pollinator’s nightmare." They hunt by ambush, seizing insects much larger than themselves, including honeybees, butterflies, and hoverflies. They deliver a potent, fast-acting venom directly to the prey’s neck or head, liquefying the insides while the spider holds the carcass aloft like a trophy.
Fascinating Fact
The *Thomisus citrinellus* is a slow-motion shapeshifter! If moved to a flower of a different color, the female can physically alter her pigment over several days. By secreting a liquid yellow dye into her outer cell layers or "bleaching" it away to appear white, she perfectly synchronizes her body to her floral backdrop.