Pectinatella magnifica (Leidy, 1851)

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English n/a ISEIA: C1
Lëtzebuergesch Schwamp-Moosdéierchen EASIN
Français Pectinatelle Wikipedia: Wikipedia - English - Greater duckweed Wikipedia - Français - Lentille d'eau géante Wikipedia - Deutsch - Vielwurzelige Teichlinse Nederlands
Deutsch Schwammartiges Moostierchen Wikispecies: Wikispecies - Pectinatella magnifica
Nederlands n/a Back to the list of invertebrates

Report the species

Report Pectinatella magnifica to the National Museum of Natural History.

Status and distribution in Luxembourg

In 2012 numerous colonies of Pectinatella magnifica (Leidy, 1851) (Bryozoa, Phylactolaemata) were discovered in the reservoir of Esch-sur-Sûre (Luxembourg) fed by the river Sûre. The colonies were particularly abundant in the shallow, warm and nutrient-rich water near the riverbank, but some colonies were spotted by divers in the reservoir at a depth of 8-9 m in one site and more than 20 m in another site. There is reliable evidence that Pectinatella was present, but less conspicuous and as such not identified, in 2011 and possibly already in 2010. P. magnifica was hitherto unrecorded in Luxembourg, but known from a site near the German-Luxembourg border near Nennig (Germany, Saarland) where statoblasts were found in 2001 (Massard et al. 2013).

There is no distribution map available because no data has been entered into the Recorder-Lux database so far (MNHNL, iNaturalist & GBIF 2019).

Risk assessment

ISEIA protocol: C1 (3+2+1+1) (Ries et al. 2017: 68).


  • Massard, J.A., G. Geimer & E. Wille, 2013. Apparition de Pectinella magnifica (Leidy, 1851) (Bryozoa, Phylactolaemata) dans le lac de barrage d’Esch-sur-Sûre (Luxembourg). Bulletin de la Société des naturalistes luxembourgeois 114: 131-148.
  • Massard, J.A. & G. Geimer, 2015. L’’histoire de la recherche bryozoologique au Luxembourg (Phylactolémates et Gymnolémates d’eau douce). Bull. Soc. Nat. luxemb. 116: 373-379. [PDF 1,35 MB]
  • MNHNL, iNaturalist & GBIF, 2019. MNHNL-mdata, online portal combining species observation from Recorder-Lux, iNaturalist and GBIF. National Museum of Natural History, Luxembourg. URL: [Accessed 2019-10-24]
  • Ries, C., A. Arendt, C. Braunert, S. Christian, A. Dohet, A. Frantz, G. Geimer, M. Hellers, J. A. Massard, X. Mestdagh, R. Proess, N. Schneider & M. Pfeiffenschneider, 2017. Environmental impact assessment and black, watch and alert list classification after the ISEIA Protocol of invertebrates in Luxembourg. Bull. Soc. Nat. luxemb. 119: 63-70. [PDF 360 KB]

 Page content last updated on 2019-11-12. Last proofread by Caroline Grounds on 2019-11-12.