Enchytraeidae

Enchytraeidae
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Annelida
Clade: Pleistoannelida
Clade: Sedentaria
Class: Clitellata
Order: Enchytraeida
Family: Enchytraeidae
Vejdovský, 1879

Enchytraeidae is a family of microdrile oligochaetes. They resemble small earthworms and include both terrestrial species known as potworms that live in highly organic terrestrial environments, as well as some that are marine. More than 700 species in about 30 genera have been described worldwide, although the true diversity of the family is thought to be much higher. Most species are small, whitish or transparent worms only a few millimetres long that feed on decaying organic matter and the microorganisms colonizing it, making them important contributors to decomposition and nutrient cycling in soils. The peculiar genus Mesenchytraeus is known as "ice worms", as they spend the majority of their lives within glaciers, only rising to the surface at certain points in the summer. Enchytraeidae also includes the Grindal worm (Enchytraeus buchholzi), which is commercially bred as aquarium fish food. Certain varieties of Enchytraeidae are partially responsible for the notorious "dark earth" archaeological layers in post-Roman Era British urban centers such as London.

Enchytraeids, like earthworms, are ecosystem engineers, influencing the soil structure by creating aggregates of various sizes. Negative interactions between potworms and earthworms have been experimentally registered, and observed in the field when a wide array of Land use types were considered. These interactions could be explained by different environmental optima, e.g. microclimate, pH and nutrient availability, texture, potentially reinforced by competition. Enchytraeids are less sensitive than earthworms to agricultural intensification and replace them in soils with heavy pesticide use. However, positive interactions between these two oligochaete groups have also been observed in microcosm experiments. Enchytraeids have been shown to feed on earthworm excrements (earthworm casts) which they pulverize and transform into fluffy masses of their own excrements (enchytraeid faeces), which form the bulk of Moder humus OH horizons.

Enchytraeids are now commonly used in ecotoxicity tests such as the enchytraeid reproduction test (ERT) guideline ISO 16387.

Genera

Enchytraeidae contains the following genera:

References

  1. ↑ O'Connor, F. B. (1967). "The Enchytraeidae". In Burges, Alan; Raw, F. (eds.). Soil biology. Cambridge, Massachusetts: Academic Press. pp. 213–257. doi:10.1016/B978-0-12-395699-6.50012-2. ISBN 978-0-12-395699-6. Retrieved 29 October 2026.
  2. ↑ Schmelz, Rüdiger M.; Collado, Rut (2015). "Checklist of taxa of Enchytraeidae (Oligochaeta): an update". Soil Organisms. 87 (2): 149–152. ISSN 2509-9523. Retrieved 3 November 2026.
  3. ↑ Cuartero, Jessica; Briones, Maria J. I.; Rast, Basil M.; Stierli, Beat; Maurer-Troxler, Claudia; Hug, Anna-Sofia; Widmer, Franco; Schlaghamerský, Jiří; Frey, Beat (February 2025). "Earthworm and enchytraeid indicator taxa of different land-use types identified using soil DNA metabarcoding". Applied Soil Ecology. 206 105891. doi:10.1016/j.apsoil.2025.105891. ISSN 1873-0272.
  4. ↑ Hartzell, Paula L.; Nghiem, Jefferson V.; Richio, Kristina J.; Shain, Daniel H. (15 February 2011). "Distribution and phylogeny of glacier ice worms (Mesenchytraeus solifugus and Mesenchytraeus solifugus rainierensis)". Canadian Journal of Zoology. 83 (9): 1206–1213. doi:10.1139/z05-116. Retrieved 30 October 2026.
  5. ↑ Shain, Daniel H.; Mason, Tarin A.; Farrell, Angela H.; Michalewicz, Lisa A. (October 2001). "Distribution and behavior of ice worms (Mesenchytraeus solifugus) in south-central Alaska". Canadian Journal of Zoology. 79 (10): 1813–1821. doi:10.1139/cjz-79-10-1813. Retrieved 30 October 2026.
  6. ↑ Bouguenec, Vincent (15 March 1992). "Oligochaetes (Tubificidae and Enchytraeidae) as food in fish rearing: a review and preliminary tests". Aquaculture. 102 (3): 201–217. doi:10.1016/0044-8486(92)90149-F. Retrieved 30 October 2026.
  7. ↑ Yule, Brian (September 1990). "The 'dark earth' and late Roman London". Antiquity. 64 (244): 625–626. doi:10.1017/S0003598X00078546. Retrieved 30 October 2026.
  8. ↑ Serbource, Cécile; Sammartino, Stéphane; Cornu, Sophie; Papillon, Justine; Adrien, Jérôme; Pelosi, Céline (January 2025). "Enchytraeids: small but important ecosystem engineers". Geoderma. 453 117150. doi:10.1016/j.geoderma.2024.117150. ISSN 1872-6259.
  9. ↑ Karaban, Kamil; Kaliszewicz, Anita; Ilieva-Makulec, Krassimira; Uvarov, Alexei V. (17 September 2025). "Earthworm species from diverse ecological groups negatively affect enchytraeid density in a forest ecosystem". Biology. 14 (9) 1283. doi:10.3390/biology14091283.
  10. ↑ Beylich, Anneke; Graefe, Ulfert (2012). "Relationships between microannelid and earthworm activity" (PDF). Newsletter on Enchytraeidae. 12: 1–12. ISSN 0376-0723. Retrieved 30 October 2026.
  11. ↑ Haukka, J. K. (February 1987). "Growth and survival of Eisenia fetida (Sav.) (Oligochaeta: Lumbricidae) in relation to temperature, moisture and presence of Enchytraeus albidus (Henle) (Enchytraeidae". Biology and Fertility of Soils. 3 (1): 99–102. ISSN 1432-0789. Retrieved 30 October 2026.
  12. ↑ Graefe, Ulfert; Beylich, Anneke (2003). "Critical values of soil acidification for annelid species and the decomposer community". Newsletter on Enchytraeidae. 8: 51–55. ISSN 0376-0723. Retrieved 30 October 2026.
  13. ↑ Standen, Valerie (April 1984). "Production and diversity of enchytraeids, earthworms and plants in fertilized hay meadow plots". Journal of Applied Ecology. 21 (1): 293–312. Retrieved 2 November 2026.
  14. ↑ Bullinger-Weber, Géraldine; Le Bayon, Renée-Claire; Guenat, Claire; Gobat, Jean-Michel (January–February 2007). "Influence of some physicochemical and biological parameters on soil structure formation in alluvial soils". European Journal of Soil Biology. 43 (1): 57–70. doi:10.1016/j.ejsobi.2006.05.003. ISSN 1778-3615. Retrieved 30 October 2026.
  15. ↑ Huhta, Veikko; Viberg, Katja (November 1999). "Competitive interactions between the earthworm Dendrobaena octaedra and the enchytraeid 'Cognettia sphagnetorum". Pedobiologia. 43 (6): 886–890. doi:10.1016/S0031-4056(24)00627-9. ISSN 1873-1511.
  16. ↑ Bart, Sylvain; Laurent, Céline; Péry, Alexandre R. R.; Mougin, Christian; Pelosi, Céline (June 2017). "Differences in sensitivity between earthworms and enchytraeids exposed to two commercial fungicides". Ecotoxicology and Environmental Safety. 140: 177–184. doi:10.1016/j.ecoenv.2017.02.052. Retrieved 3 November 2026.
  17. 1 2 Topoliantz, Stéphanie; Ponge, Jean-François; Viaux, Philippe (October 2000). "Earthworm and enchytraeid activity under different arable farming systems, as exemplified by biogenic structures". Plant and Soil. 225 (1–2): 39–51. doi:10.1023/A:1026537632468. Retrieved 3 November 2026.
  18. ↑ Sandor, Mignon; Schrader, Stefan (June 2012). "Interaction of earthworms and enchytraeids in organically amended soil" (PDF). North-Western Journal of Zoology. 8 (1): 46–56. Retrieved 30 October 2026.
  19. ↑ Karaban, Kamil; Uvarov, Alexei V. (June 2014). "Non-trophic effects of earthworms on enchytraeids: an experimental investigation". Soil Biology and Biochemistry. 73: 84–92. Retrieved 30 October 2026.
  20. ↑ Ponge, Jean-François (1 November 1999). "Horizons and humus forms in beech forests of the Belgian Ardennes". Soil Science Society of America Journal. 63 (6): 1888–1901. doi:10.2136/sssaj1999.6361888x.
  21. ↑ "Soil quality. Effects of contaminants on Enchytraeidae (Enchytraeus sp.). Determination of effects on reproduction" (PDF). cdn.standards.iteh.ai. March 2023. Retrieved 3 November 2026.
  22. ↑ Castro-Ferreira, Marta P.; Roelofs, Dick; Van Gestel, Cornelis A. M.; Verweij, Rudo A.; Soares, Amadeu M. D. M.; Amorim, Mónica J. B. (June 2012). "Enchytraeus crypticus as model species in soil ecotoxicology". Chemosphere. 87 (11): 1222–1227. doi:10.1016/j.chemosphere.2012.01.021. Retrieved 3 November 2026.
  23. ↑ "Enchytraeidae d'Udekem, 1855". WoRMS. World Register of Marine Species. 2026. Retrieved 2026-07-30.