Red-shouldered Bug, Goldenrain Tree Bug
Jadera hematoloma (Note: This is an insect, not a spider)
Family Rhopalidae (Scentless Plant Bugs), Order Hemiptera (True Bugs)
Physical Description
A true bug with a flattened, oval body typical of the Hemiptera order. It features a distinct head with long, four-segmented antennae and a sucking proboscis. It has six legs (identifying it as an insect, whereas spiders have eight) and lacks the two-segmented body structure of arachnids.
Size Estimate
Approximately 9 mm to 14 mm (0.35 to 0.55 inches) in length; the specimen in the image appears to be an adult.
Coloration & Markings
Dark brownish-black to charcoal wings and body with vibrant red 'shoulders' (the lateral margins of the pronotum) and red eyes. Nymphs of this species are often almost entirely bright red.
Web Type
None. As an insect, it does not spin silk or webs; it is a ground and foliage dweller.
Eye Arrangement
Two compound eyes located on the sides of the head, typically red in color, plus two simple eyes (ocelli) on top of the head.
Leg Characteristics
Six slender, black legs designed for walking and climbing. They do not have the specialized hunting claws or hairs found on most spiders.
Venom & Safety Information
Venom Information
None. They lack venom and cannot sting or bite humans effectively.
Medical Significance
Harmless. They are not known to transmit diseases or cause allergic reactions. They do not bite people.
Safety Recommendations
No action is required as they are harmless. If they enter the home, they can be swept outside. They do not cause structural damage or infest food pantries.
Habitat & Behavior
Habitat & Range
Common across the southern United States (from Florida to California), Mexico, Central America, and the Caribbean. Highly associated with host plants like Goldenrain trees, Boxelder, and Soapberry trees.
Behavior & Temperament
Docile and harmless. They are active during the day and are often found in large communal groups, especially during mating season or when sunning themselves on walls and fences.
Diet & Prey
Herbivorous. They use their piercing-sucking mouthparts to feed on the seeds of plants in the Sapindaceae family (Sapindales), particularly the fallen seeds of Goldenrain trees.
Seasonal Activity
Most active in spring and autumn. In warmer climates, they may be seen year-round but often aggregate on warm surfaces during cooler months.
Description
An attractive, charcoal-colored true bug characterized by its striking red borders and eyes. While often mistaken for a spider by those wary of small crawling creatures, it is a specialized seed-eater that plays a specific role in managing seed populations of invasive trees.
Key Features
Six legs, long antennae, red eyes, and red margins on the area behind the head (pronotum).
Similar Species
Often confused with the Boxelder Bug (Boisea trivittata), which has red veins on its wings, or the Eastern Boxelder Bug.
Life Cycle
Undergoes incomplete metamorphosis (egg, nymph, adult). Females lay eggs in the soil or on host plants. Nymphs resemble small, wingless bright red versions of the adults.
Ecological Importance
Primary seed predator of soapberry plants; can help control the spread of invasive Goldenrain trees in certain urban environments.
Conservation Status
Not evaluated; common and widespread, often considered a minor garden nuisance rather than a species of concern.
Interesting Facts
The length of their beak (rostrum) has been observed to evolve rapidly in response to the introduction of non-native host plants with different seed pod thicknesses.
Photography Tips
Focus on the 'shoulders' and head to show the red markings. They are relatively slow-moving, making them easy subjects for macro photography in natural sunlight.
Identified: 2026-04-27T16:06:14.644222