From ZooTerms (Dictionary of Invertebrate Zoology)
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plectolophe (noun; Greek plektos, twisted; lophos, crest): (Brachiopoda) A lophophore where each branchium has a U-shaped side arm with a double row of paired filamental appendages, terminating distally in a medial plano-spire normal to commissural plane with a single row of paired appendages.