Flabellina gracilis (Alder & Hancock, 1844)

Homonyms: Flabellina gracilis (Alder & Hancock, 1844)
Common names: Grazile Fadenschnecke in German; slanke waaierslak in Dutch; slender aeolis in English; slender seaslug in English

Abbott, R. T. (1974). American seashells. The marine Mollusca of the Atlantic and Pacific coast of North America. ed. 2. Van Nostrand, New York. 663 pp., 24 pls. [October 1974].
Bromley, J.E.C. & J.S. Bleakney. (1985). Keys to the fauna and flora of Minas Basin. National Research Council of Canada Report, Halifax, N.S. 24119: 366 PP.
Hansson (1899-12-31 23:00:00) NEAT (North East Atlantic Taxa): South Scandinavian marine Mollusca Check-List.
Integrated Taxonomic Information System (ITIS).
Karlsson, Anna (2015-03-22 23:00:00) Mollusker
Lundin & Malmberg (2013-04-14 22:00:00) Checklista över svenska nudibranchia (88 arter). Version 2013-04-09 med kommentarer från checklista januari 2013
Pollock, L.W. (1998). A practical guide to the marine animals of northeastern North America. Rutgers University Press. New Brunswick, New Jersey & London. 367 pp.
Rosenberg, G. 2004. Malacolog Version 3.3.2: Western Atlantic gastropod database. The Academy of Natural Sciences, Philadelphia, PA.
Trott, T. J. (2004). Cobscook Bay inventory: a historical checklist of marine invertebrates spanning 162 years. Northeastern Naturalist. 11, 261-324.
Turgeon, D. D., J. F. Quinn, Jr., A. E. Bogan, E. V. Coan, F. G. Hochberg, W. G. Lyons, et al., 1998: Common and scientific names of aquatic invertebrates from the United States and Canada: Mollusks, 2nd ed.. American Fisheries Society Special Publication 26. 526.
WoRMS Editorial Board (2013-01-15 23:00:00) WoRMS - World Register of Marine Species