Hyloniscus riparius

(C. Koch, 1838)

Riparian Woodlouse

A small native to Central and Eastern Europe that has established in North America since 1951 and is expanding eastward across Russia. It thrives in floodplain environments and can survive prolonged submersion. In invaded regions, it reaches high densities and may dominate local woodlice , potentially displacing native .

Hyloniscus riparius by (c) Katja Schulz, some rights reserved (CC BY), uploaded by Katja Schulz. Used under a CC-BY license.

Hyloniscus riparius (10.3897-zookeys.801.21894) Figure 5 (cropped) by De Smedt P, Boerave P, Arijs G, Segers S (2018) Woodlice of Belgium: an annotated checklist and bibliography (Isopoda, Oniscidea). In: Hornung E, Taiti S, Szlavecz K (Eds) Isopods in a Changing World. ZooKeys 801: 265-304. https://doi.org/10.3897/zookeys.801.21894. Used under a CC BY 4.0 license.

Pronunciation

How to pronounce Hyloniscus riparius: //haɪloʊˈnɪskəs rɪˈpɛəriəs//

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Images

Habitat

Strongly associated with flood plains and riparian zones. Capable of tolerating up to eight weeks of submersion in water.

Distribution

Native to Central and Eastern Europe. Introduced to North America: first recorded at St. John's, Newfoundland in 1951, subsequently found in New York, New Jersey, Pennsylvania, and North Carolina. In Russia, spreading eastward from Kyiv since the 1990s with almost ubiquitous distribution in studied Central Russian territories.

Behavior

Has been observed to survive prolonged flooding through physiological to submersion.

Ecological Role

in North America and Russia. In Central Russia, reaches densities up to 54 individuals per square meter and up to 99% of total woodlice abundance in some . Potential to displace woodlice with possible long-term consequences for soil biodiversity and stability.

Human Relevance

Unintentionally introduced to new continents, where it has become established in urban and natural .

More Details

Invasion History

First North American record from St. John's, Newfoundland in 1951. Russian expansion documented from eight registrations since the 1990s, all east of previous findings.

Population Impact

In Central Russian woodlice , has been observed at densities reaching 54 ind./m² and comprising up to 99% of total woodlice abundance.