Field Guide

Land Invertebrates

Showing 31 - 40 of 50 results
Photo of arrow-shaped micrathena spider
Arrowshaped Micrathena
Micrathena sagittata
One of three micrathena spiders in Missouri, the arrowshaped micrathena is small but unforgettable. Females have striking reddish, black, and yellow colors, and a pair of outward-pointing tubercles at the end of the body give it a triangular or "arrow" shape.
Photo of a furrow orbweaver hanging head down with a green background
Furrow Orbweavers
Larinioides spp.
Furrow orbweavers have a distinctive dark pattern on the abdomen that resembles a furrow. These harmless spiders are common under the eaves of homes and near porch lights.
striped bark scorpion on a rock
Striped Bark Scorpion
Centruroides vittatus
Striped bark scorpions are pale yellowish brown, usually with two lengthwise dark stripes on the abdomen. It is the only species of scorpion in Missouri. It occurs in glades and other dry, warm, rocky areas, and sometimes in buildings and shelters and under piles of wood, brush, or garbage.
Photo of a female scorpionfly perched on a leaf.
Common Scorpionflies
Panorpa spp.
Male scorpionflies will make you look twice, because the abdomen is tipped with what looks like a scorpion stinger! These nifty insects cannot sting, however.
Photo of a female openfield orbweaver spider crouching on a plant stalk
Openfield Orbweaver
Araneus pratensis
The openfield orbweaver is a common nocturnal orb-weaving spider in Missouri.
Marbled orbweaver spider in web
Marbled Orbweaver
Araneus marmoreus
The marbled orbweaver is sometimes called the “pumpkin spider” because its rounded abdomen is sometimes bright orange. The color and markings can vary greatly.
Photo of an armored harvestman walking on the ground
Armored Harvestmen
Members of suborder Laniatores
Armored harvestmen have spines on their fingerlike mouthparts (pedipalps). Unlike other harvestmen, members of this suborder of so-called daddy longlegs do not usually have long legs.
Photo of a northern crab spider
Northern Crab Spider
Mecaphesa asperata
The northern crab spider has many spiny hairs covering the top surfaces of the carapace, abdomen, and legs, and it has usually has greenish-yellow or yellow-brown markings.
Photo of a swift crab spider, female, from above.
Swift Crab Spider
Mecaphesa celer (formerly Misumenops celer)
The swift crab spider has many spiny hairs covering the top of its body and legs, and it often has a light pinkish-tan cast.
Photo of a green crab spider on a leaf
Green Crab Spider
Misumessus oblongus (formerly Misumenops oblonga)
The green crab spider has spines, and the entire body and legs are pale green to silvery white. Like other crab spiders, its legs extend outward from the sides, and it can walk in any direction.
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.