Salmon Cherry Millipede
Semionellus placidus (Wood, 1864)
Taxonomy
| Kingdom | Animalia |
|---|---|
| Phylum | Arthropoda |
| Subphylum | Myriapoda |
| Class | Diplopoda |
| Order | Polydesmida |
| Family | Xystodesmidae |
| Genus | Semionellus |
| Species | Semionellus placidus (Wood, 1864) |
Description
Diagnostic characters
- Ecological class
- Accidental
Distribution
Range
Known from one county in Illinois.
Continent
North America
Country
United States
States and provinces
Illinois
Counties
- Illinois
- Union
Conservation and management
NatureServe
G3 Vulnerable
National ranks
- United States
- NNR
Subnational ranks
- Virginia
- S3 Vulnerable
- Illinois
- SNR Unranked
Ranks looked up 2 July 2026. Conservation status changes, and a rank here is as current as that date and no more.
State and federal status
Not listed under the U.S. Endangered Species Act.
References
- Peck, S.B. & Lewis, J.J. 1978. Zoogeography and evolution of the subterranean invertebrate faunas of Illinois and southeastern Missouri. National Speleological Society Bulletin 40: 39–63.
- Webb, D.W., Taylor, S.J. & Krejca, J.K. 1993. The biological resources of Illinois caves and other subterranean environments. Illinois Natural History Survey, Champaign, Illinois, USA. 143 pp.
This account was last revised 6 September 2026. Conservation ranks were looked up 2 July 2026.
How to cite this account
Semionellus placidus (Wood, 1864). Cave Biology Data Portal, account SP-2924. https://cavebiology.org/species/semionellus-placidus/ (accessed 22 October 2026).
Data sources and funding are listed in the Acknowledgments.
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