At least one marine slime mold glides around using communal membrane-bound slime trails.

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"A variety of microscopic algae (diatoms, desmids, and others) engage in gliding motion across surfaces; the motion is usually associated with the secretion of slime, but the source of the shearing force between organism and substratum is unclear; it's certainly different from any of the mechanisms we've considered so far (Halfen 1979; Melkonian 1992). Leaving a slime trail may push up the cost of transport, as the work on slug locomotion suggests.

"One kind of marine slime mold, Labyrinthula, restricts its slime to communal membrane-bound 'slime ways,' through which its autonomous cells glide (Dusenberry 1996). The engine involves interactions between the same two proteins, actin and myosin, as does that of muscle (Dietz and Schnetter 1999)." (Vogel 2003:450)

Comparative Biomechanics: Life's Physical World, Second EditionJune 17, 2013
Steven Vogel

Journal article
Interaction of two myosins with microfilaments causes locomotion inLabyrinthula sp.ProtoplasmaMarch 24, 2005
Cornelia Dietz, Reinhard Schnetter

Life at Small Scale: The Behavior of Microbes (Scientific American Library)September 1, 1996
David B. Dusenbery

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