Dermestid Beetle Larva, Carpet Beetle Larva, Larder Beetle Larva, 'Woolly Bear' larva
Dermestes lardarius / Anthrenus species larva (Not a spider)
Family Dermestidae (Skin Beetles), Order Coleoptera (Beetles). Note: This specimen is an insect larva, not an arachnid (Order Araneae).
Physical Description
Elongate, cylindrical, or slightly tapered larva covered in dense, stiff hairs (setae) and speartipped hairs (hastisetae). Segmented body with a distinct dark head capsule at one end, three pairs of small thoracic legs, and prominent tufts or bristles radiating outward along the body length.
Size Estimate
4 mm to 8 mm (approximately 1/6 to 1/3 inch) in length. Typical for a mid-to-late instar dermestid larva.
Coloration & Markings
Dark brown to charcoal grey or black, with lighter yellowish to tan banding between body segments. Covered in prominent dark or translucent brownish-black bristles.
Web Type
Does not produce silk webs or capture structures. Dermestid larvae crawl freely along surfaces, crevices, baseboards, or within food/textile materials.
Eye Arrangement
Insects do not possess spider eye arrangements; dermestid larvae have tiny simple eyes (stemmata) on the sides of the head capsule, barely visible without high magnification.
Leg Characteristics
Six small jointed thoracic legs located near the front of the body (head end). Lacks the eight long legs characteristic of spiders.
Venom & Safety Information
Venom Information
Completely non-venomous. Contains no venom glands, fangs, or stinging apparatus.
Medical Significance
Poses no medical danger. Does not bite or sting. However, the shed larval bristles (hastisetae) can cause mild skin irritation, itching, or allergic dermatitis (carpet beetle dermatitis) in sensitive individuals upon contact.
Safety Recommendations
Harmless to humans and pets. To manage indoors, vacuum baseboards, carpets, and closets thoroughly, store woolens and dry pet foods in airtight containers, and discard heavily infested items.
Habitat & Behavior
Habitat & Range
Cosmopolitan / Worldwide distribution. Commonly found indoors in homes, pantries, closets, carpets, baseboards, under furniture, and in stored biological collections, dried animal feed, or natural fiber products.
Behavior & Temperament
Slow-moving, active crawling insect larva. When disturbed, it may curl up, remain motionless, or shed bristly hairs defensively. Non-aggressive.
Diet & Prey
Scavenger feeding on dry organic materials containing keratin, chitin, or protein—including wool, feathers, dead insects, pet food, dried meats, hair, fur, and natural carpets.
Seasonal Activity
Active year-round indoors in climate-controlled homes. Outdoors, larvae feed through spring and summer, overwintering as pupa or larvae before emerging as adult beetles in spring.
Description
This organism is a Dermestid Beetle Larva, commonly referred to as a carpet beetle or larder beetle larva. Though frequently mistaken for a small spider or bristly caterpillar, it is an insect belonging to the beetle family Dermestidae. Covered in protective spiky setae, these larvae are efficient scavengers of dried organic material around the home.
Key Features
Elongated segmented body with prominent radiating bristles, 6 small legs near the head, lack of a spider's two-part cephalothorax/abdomen structure, and absence of silk webbing.
Similar Species
Often confused with bristly caterpillars (Lepidoptera larvae), house centipedes (Scutigera coleoptrata), or small hairy spiders, but easily distinguished by its six true thoracic legs, segmented worm-like body, and dense larval setae.
Life Cycle
Complete metamorphosis (holometabolous): Egg -> Larva -> Pupa -> Adult Beetle. The larval stage undergoes multiple molts, leaving behind thin, hollow, hairy skin castings (exuviae) that are often mistaken for live insects.
Ecological Importance
In nature, they act as essential decomposers, recycling dead animal matter, fur, feathers, and dried protein structures back into the soil ecosystem.
Conservation Status
Not evaluated / Abundant urban pest species with stable worldwide populations.
Interesting Facts
Dermestid beetle larvae are utilized by natural history museums and taxidermists to clean flesh cleanly off animal skeletons without damaging delicate bone structures.
Photography Tips
Use a macro lens or extreme close-up zoom focused on the head and body segmentation to clearly reveal the six legs and bristles, confirming its identity as a beetle larva rather than an arachnid.
Identified: 2026-07-22T17:41:20.455022