Field Guide

Land Invertebrates

Showing 1 - 10 of 26 results
Acrobat ants on a leaf
Ants
More than 700 species in North America
Ants are everywhere! They outnumber us a million to one. These colonial insects are familiar to everyone on Earth. Their lives are endlessly fascinating.
image of Assassin Bug crawling on a leaf
Assassin Bugs
Nearly 200 species in North America north of Mexico
Assassin bugs are usually black or brown, with an elongated head bearing a single, clawlike tube used for piercing and injecting venom into their prey. They are common in Missouri.
Click beetle resting on a brick wall
Click Beetles
Approximately 1,000 species in North America
Their streamlined shape is distinctive, but the behavior of click beetles is even more unique: Placed on their backs, these beetles flip suddenly into the air with an audible click.
Wood cockroach crawling on tree
Cockroaches and Termites
About 100 species of cockroaches and termites in North America north of Mexico
Cockroaches well-known: they are flattened, small, brown or black, often shiny insects that can hide in tight crevices and lack specialized appendages. Recently, termites have been included in their order.
image of a Common True Katydid
Common True Katydid
Pterophylla camellifolia
The common true katydid is a master mimic. Its bright green color matches surrounding leaves, and its wings are veined like leaves as well.
Earthworm on the surface of granular soil
Earthworms
About 175 species in North America
Earthworms are familiar to just about everyone who digs in the soil. They play a major role in the nutrient cycling and structure of soils. There are many species. The most familiar ones in Missouri are nonnative.
Photo of an adult female field cricket
Field Crickets
Gryllus spp., Acheta domesticus, and other in subfamily Gryllinae
Field crickets and house crickets are celebrated singers. There are several species in Missouri.
image of Green Lacewing clinging to rock
Green Lacewings
About 85 species in North America north of Mexico
Green lacewings are delicate insects whose larvae are ravenous predators of aphids. This makes the lacewing a friend to gardeners!
A metallic green sweat bee gathering pollen on a yellow flowerhead
Halictid Bees (Sweat Bees)
More than 500 species in North America north of Mexico
Missouri has many species of halictid bees, or sweat bees. Some are solitary, but a number show different levels of social behavior. They're named for their attraction to perspiration, which offers them precious moisture and salts.
image of an Ichneumon Wasp on tree trunk
Ichneumon Wasps
More than 5,000 species in North America
Most ichneumon wasps are harmless, although the long ovipositor of the female is intimidating. Their larvae live as parasites inside caterpillars and other larval insects.
See Also
Photo of a Yellow-Collared Scape Moth
Yellow-Collared Scape Moth
Cisseps fulvicollis
The yellow-collared scape moth is more often “orange-collared.” And whether you think it looks more like a firefly or a wasp, it’s still a moth!
image of Plume Moth on blade of grass
Plume Moths
Nearly 150 species in North America north of Mexico
Slim, delicate plume moths are instantly recognizable by their T-shaped silhouette, long legs, and muted shades of tan and brown. It can be hard to separate the various species.
Photo of an Isabella Tiger Moth
Isabella Tiger Moth (Woolly Bear; Woolly Worm)
Pyrrharctia isabella
Not many people know the adult Isabella tiger moth when they see one, but we’re all acquainted with its caterpillar, the woolly worm, or woolly bear.

About Land Invertebrates in Missouri

Invertebrates are animals without backbones, including earthworms, slugs, snails, and arthropods. Arthropods—invertebrates with “jointed legs” — are a group of invertebrates that includes crayfish, shrimp, millipedes, centipedes, mites, spiders, and insects. There may be as many as 10 million species of insects alive on earth today, and they probably constitute more than 90 percent all animal species.