Invasive Invertebrates

Japanese Mystery Snail

In Japan, this snail is typically found in rice paddy fields feeding on sludge. After being imported to San Francisco at an Asian food market the snail has been established in many US water systems. It is said that they are a large nuisance to fishermen because of their population density, and they are a host to multiple parasites.

Photo credit: Aquarium Care Basics

Olive Trump

Chinese Mitten Crab

The Chinese Mitten crab is easily identified by its furry claws that resemble mittens. This crab is native to Eastern Asian, found in coastal habitats and rivers. These crabs made their way to the West coast through fishing boats. They pose a huge threat to stream and river erosion from burrowing, they carry human parasites, and they interfere with the native ecosystem.

Photo credit:

Lucy Stout


The Signal Crayfish which is native to the Pacific Northwest can be identified by it’s smooth claws, a white “signal ” spot on it’s claw and a wide body plate on it’s back. They consume the native species food and spread crayfish plague that can destroy the native populations.

Photo Credit: Wikipedia

Mack Rhoten

New Zealand Mud Snail

The New Zealand Mud Snail is minuscule as you can see through the comparison to a dime, ranging from 3 to 6 mm long. They reproduce at substantial rates making them invasive all throughout North America. They are non-native, hence their name, however, have no predators to control their massive population size. They are so small that they can be transported effortlessly finding their way into any small space. I had fun carving this block specifically, because of their size and population, I carved the block to have a hectic and almost abstract mood.

The New Zealand Mud Snails impact disrupts up to 95 percent of the microinvertabrate biomass by consuming up to half of the available food sources in a stream. This disruption affects the food chain and reduces the population of surrounding fish.

Photo Credit: USGS/Florida Caribbean Science Center

Gracie Cummings & Malaya Bradford

Zebra Mussel

Zebra mussels are a small, invasive mollusk named for their signature black striped shells. Originally from the fresh waters of Eurasia, these mollusks are particularly destructive in their non-native environments. They filter out algae that many native animals require for sustenance, and they attach themselves to native mussels, incapacitating them. They are also exceptionally difficult to get rid of, with water power plants spending millions to clear them from water intakes.

Mary Hubbert

Brown Marmorated Stink Bug

Brown Marmorated Stink Bug is an invasive bug that is a serious pest of fruit, vegetable, and other crops. It also becomes a nuisance pest of homes as it is attracted to the outside of houses on warm fall days in search of protected, overwintering sites and can enter houses in large numbers.

Photo Credit: Marco Uliana

Michael Todea