Invertebrates
77 species in the encyclopedia
Animals without a backbone — from insects and spiders to molluscs and crustaceans.
Amber Snail
Succinea putris
The Amber Snail is a small terrestrial gastropod mollusk recognized for its translucent, amber-colored shell. It is most commonly found in moist habitats near freshwater sources such as streams, rivers, and marshes. The snail prefers environments with abundant vegetation, where it feeds primarily on decaying plant matter and algae. Amber Snails play a role in nutrient cycling within wetland ecosystems and serve as prey for a variety of birds, amphibians, and insects.
Atlantic mole crab
Emerita talpoida
The Atlantic mole crab is a small, burrowing crustacean commonly found along sandy beaches of the western Atlantic Ocean. Recognizable by its oval, domed body and lack of claws, this crab is an expert at digging backward into the sand, where it spends most of its life. It filters plankton and organic matter from the water using its feathery antennae, emerging at the edge of the surf to feed and reproduce. The species is vital to coastal ecosystems, serving as both prey for shorebirds and fish and as a key player in nutrient cycling.
Atlas Beetle
Chalcosoma atlas
The Atlas Beetle is one of the largest and most impressive beetles in the world, recognized for its three prominent horns on males. Native to the tropical forests of Southeast Asia, this beetle is a member of the rhinoceros beetle group and exhibits strong sexual dimorphism, with males being much larger and more heavily armored than females. The Atlas Beetle spends the majority of its life as a larva, feeding on decaying wood, before emerging as an adult to search for mates. Adult beetles are known for their strength, capable of lifting objects up to several times their own body weight.
Atlas moth caterpillar
Attacus atlas
The Atlas moth caterpillar is the larval stage of the Atlas moth, one of the largest moth species in the world. These caterpillars are strikingly pale green to bluish-green, adorned with white, waxy spines along their bodies and a plump, segmented appearance. They feed voraciously on the leaves of a variety of trees and shrubs, storing up nutrients for their dramatic transformation into adult moths. Native to the tropical and subtropical forests of Southeast Asia, the Atlas moth caterpillar plays a vital role in the life cycle of this iconic invertebrate.
Aye-aye Leech
Chtonobdella ayeaye
The Aye-aye leech (Chtonobdella ayeaye) is a rare terrestrial blood-feeding leech discovered in the rainforests of Madagascar. This unique invertebrate is notable for its association with the aye-aye lemur, from which it is believed to commonly feed. Unlike many aquatic leeches, the Aye-aye leech has adapted to a primarily arboreal and terrestrial lifestyle, using its muscular body to move through leaf litter and up trees. Its presence is considered an indicator of healthy, undisturbed rainforest ecosystems.
Bamboo Shrimp
Atyopsis moluccensis
The Bamboo Shrimp is a medium-sized freshwater shrimp native to Southeast Asia, known for its unique fan-like appendages that it uses to filter feed from the water. This species has a reddish-brown to tan body, often with a creamy stripe running along its back, and can grow up to 10 cm in length. Bamboo Shrimp are peaceful, social invertebrates commonly found in fast-flowing streams and rivers, where they cling to rocks and filter plankton and detritus from the current. Due to their gentle nature and fascinating feeding behavior, they are popular in freshwater aquariums around the world.
Bioluminescent Comb Jelly
Mnemiopsis leidyi
The bioluminescent comb jelly, Mnemiopsis leidyi, is a mesmerizing marine invertebrate known for its shimmering, light-producing abilities. Its transparent, oval-shaped body is lined with eight rows of cilia, called 'combs,' which refract light and give the animal an iridescent appearance as it moves gracefully through the water. This species can emit a beautiful bluish-green glow when disturbed, a phenomenon used to startle predators or communicate. Native to the western Atlantic Ocean but now found in many parts of the world, comb jellies play a significant role in marine ecosystems as both predator and prey.
Black garden ant
Lasius niger
The black garden ant is a small, dark-colored insect native to much of Europe, parts of Asia, and introduced areas in North America. These ants are renowned for their intricate social structure, where a single queen can live for many years and lay thousands of eggs, supported by numerous worker ants. They commonly build their nests in soil, under stones, or within lawns and gardens, often creating extensive underground colonies. Black garden ants primarily feed on insects, nectar, and honeydew from aphids, playing a vital role in garden ecosystems.
Blue Carpenter Bee
Xylocopa caerulea
The Blue Carpenter Bee is a strikingly colored, large bee species known for its metallic blue body and fuzzy appearance. Unlike honeybees, these solitary bees do not live in colonies; instead, females bore into dead wood or bamboo to create nests for their offspring. They play an important role in pollination, especially for large flowers, thanks to their robust size and strength. Blue Carpenter Bees are generally non-aggressive and are found in a range of habitats from forests to gardens across Southeast Asia and parts of Australia.
Blue dragon (sea slug)
Glaucus atlanticus
The blue dragon (Glaucus atlanticus) is a strikingly colored species of small, pelagic sea slug found floating on the surface of warm ocean waters. Renowned for its iridescent blue and silver coloration, this nudibranch uses its unique appearance as camouflage against both predators above and below. It preys on venomous siphonophores such as the Portuguese man o' war, storing their stinging cells within its own tissues to use for its own defense. Despite its delicate, almost fantastical appearance, the blue dragon is a fierce carnivore and an expert drifter, traveling vast distances propelled by ocean currents.
Blue Morpho Butterfly
Morpho menelaus
The Blue Morpho Butterfly is one of the largest and most striking butterflies in the world, easily recognized by its vivid, iridescent blue wings. Native to the tropical forests of Central and South America, this butterfly uses its brilliant coloration to startle predators and communicate with other morphos. The Blue Morpho spends most of its time in the lower understory, feeding on fermenting fruit and occasionally tree sap. Its lifecycle includes a remarkable metamorphosis from caterpillar to adult, with each stage adapted to survive in the dense rainforest environment.
Blue orchard bee
Osmia lignaria
The blue orchard bee is a solitary, native bee species found across North America, known for its striking metallic blue to greenish coloration. Unlike honey bees, these bees do not form large colonies but nest individually in pre-existing cavities such as hollow stems or wood holes. They are highly valued for their exceptional efficiency in pollinating fruit trees, especially apples, cherries, and almonds. Blue orchard bees are active in early spring, coinciding with orchard bloom, and have become increasingly important in agricultural pollination due to their gentle nature and effectiveness.
Blue Sea Star
Linckia laevigata
The Blue Sea Star is a striking echinoderm known for its vibrant blue coloration and five slender arms. Found throughout the shallow waters of the Indo-Pacific, it is a common sight on coral reefs, sandy bottoms, and seagrass beds. This species can reach up to 30 centimeters in diameter and is known for its ability to regenerate lost limbs. Blue Sea Stars play a vital role in reef ecosystems, providing habitat for small invertebrates and participating in the food web.
Bobbit Worm
Eunice aphroditois
The Bobbit worm is a large predatory polychaete annelid found in the warm oceans of the Indo-Pacific region. It is famous for its long, segmented body that can reach up to 3 meters in length and its five antennae, which it uses to sense prey. The Bobbit worm buries itself in the seafloor substrate, leaving only its jaws exposed, and ambushes unsuspecting fish and invertebrates with lightning-fast strikes. Its powerful jaws can slice prey in half, and it injects toxins to immobilize its victims. Despite its fearsome reputation, the Bobbit worm plays an important role in maintaining healthy marine ecosystems.
Bristle Worm
Polychaeta
Bristle worms are a diverse group of segmented marine worms belonging to the class Polychaeta. These invertebrates are characterized by their elongated, soft bodies and numerous bristles (called chaetae) extending from parapodia on each segment. They are found in oceans worldwide, inhabiting a range of environments from sandy and muddy substrates to coral reefs and rocky crevices. Some species are harmless detritivores, while others can be opportunistic predators or even venomous, delivering a painful sting to humans if handled. Bristle worms play an important ecological role by recycling organic matter and aerating marine sediments.
Brown marmorated stink bug
Halyomorpha halys
The brown marmorated stink bug is an invasive insect species originally native to East Asia, particularly China, Japan, and Korea. Recognizable by its shield-shaped body and mottled brown coloration, this bug emits a pungent odor when threatened or crushed, which serves as a defense mechanism against predators. It is considered a significant agricultural pest, feeding on a wide variety of fruits, vegetables, and ornamental plants, causing extensive crop damage. Since its accidental introduction to North America and Europe, the brown marmorated stink bug has rapidly spread, adapting well to both urban and rural environments.
Camel Spider
Galeodes arabs
The camel spider, also known as a wind scorpion or solifuge, is a fast-moving arachnid found in arid desert regions. Despite popular myths, camel spiders are not venomous to humans and do not prey on camels. They possess large, powerful chelicerae (jaws) used to capture and macerate prey, and can grow up to 15 cm (6 in) in length including their legs. Highly adapted to hot, dry climates, camel spiders are nocturnal hunters, feeding on insects and small animals.
Coconut octopus
Amphioctopus marginatus
The coconut octopus is a medium-sized cephalopod known for its remarkable intelligence and unique behavior. It inhabits sandy and muddy sea floors in tropical waters of the western Pacific and Indian Oceans. This octopus is famous for its use of coconut shells and seashells as portable shelters, which it carries and assembles for protection. Its arms are banded and its body is mottled brown and white, allowing it to blend seamlessly with its surroundings.
Common cockchafer
Melolontha melolontha
The common cockchafer, also known as the May bug or doodlebug, is a large, stout beetle native to Europe and parts of Asia. Recognizable by its brown elytra, fan-like antennae, and distinctive white markings on the sides of the abdomen, this beetle is a prominent member of the Scarabaeidae family. Adults emerge in late spring and are known for their noisy flight and attraction to lights at night. The larvae, called white grubs, live underground for several years, feeding on plant roots and sometimes causing significant agricultural damage.
Common Firefly
Photinus pyralis
The common firefly, also known as the lightning bug, is a nocturnal beetle renowned for its ability to produce light through bioluminescence. These insects are most active during warm summer evenings, where their rhythmic flashes are used to attract mates and communicate. Fireflies are found in a variety of habitats, especially in moist environments like meadows, forests, and near bodies of water. Their larvae are predatory and play an important ecological role by feeding on other small invertebrates. Adults are often seen flying low over grasses, creating magical displays of glowing lights.
Common housefly
Musca domestica
The common housefly is a small, widespread insect found in human dwellings across the globe. It is easily recognized by its gray thorax with four dark longitudinal stripes and slightly hairy body, measuring about 6 to 7 mm in length. Houseflies are notorious for their rapid breeding cycle and their association with human environments, where they feed on a variety of organic matter. They play a significant role in the transmission of various pathogens, making them a concern for public health.
Common Limpet
Patella vulgata
The common limpet is a small, marine gastropod mollusk known for its distinct conical shell, which tightly adheres to rocks in the intertidal zone. Limpets use a powerful muscular foot and secreted mucus to cling tenaciously to surfaces, helping them withstand powerful waves. They feed primarily on algae, scraping it off rocks with their specialized radula. Limpets are an important part of the coastal ecosystem, influencing the distribution of algae and providing food for various predators.
Common periwinkle
Littorina littorea
The common periwinkle is a small marine snail that inhabits rocky shorelines and coastal habitats throughout the North Atlantic. Its shell is typically dark gray or brown, smooth, and measures up to 3 cm in height. This hardy mollusk is highly adaptable, able to survive exposure to air during low tide and tolerate fluctuations in salinity. Common periwinkles play an important role in the ecosystem by grazing on algae and helping to control algal growth. They are also widely harvested for food, especially in Europe.
Cone Snail
Conus
The cone snail is a group of predatory marine gastropod mollusks known for their beautifully patterned, cone-shaped shells. Found primarily in tropical and subtropical ocean waters, these snails use a specialized, harpoon-like tooth to inject potent venom into their prey, which includes fish, worms, and other mollusks. Some cone snail species possess venom powerful enough to be dangerous, and even fatal, to humans. Despite their slow movement, cone snails are highly effective hunters thanks to their unique method of venom delivery.