Pleurozia
Introduction '''''Pleurozia''''' is the only genus of liverworts in the family  '''Pleuroziaceae''', which is now classified in its own order '''Pleuroziales''', but was previously included in a broader circumscription of the Jungermanniales. The genus includes twelve species, and as a whole is both physically distinctive and widely distributed.The lower leaf lobes of ''Pleurozia'' species are fused, forming a closed water sac covered by a movable lid similar in structure to those of the angiosperm genus ''Utricularia''. These sacs were assumed to play a role in water storage, but a 2005 study on ''Pleurozia purpurea'' found that the sacs attract and trap ciliates, much in the same way as ''Utricularia''. Observations of plants ''in situ'' also revealed a large number of trapped prey within the sacs, suggesting that the species in this genus obtain some benefit from a carnivorous habit. After ''Colura'', this was the second report of zoophagy among the liverworts.
Taxonomy The genus ''Pleurozia'' has been subdivided into three subenera:*'''''Pleurozia'' subg. ''Pleurozia'''''**''Pleurozia gigantea'' (Weber) Lindberg*'''''Pleurozia'' subg. ''Constantifolia''''' Thiers**''Pleurozia purpurea'' Lindberg**''Pleurozia conchifolia'' (Hooker & Arnott) Austin*'''''Pleurozia'' subg. ''Diversifolia''''' Thiers**''Pleurozia acinosa'' (Mitten) Trevisan**''Pleurozia articulata'' (Lindberg) Lindberg & Lackström**''Pleurozia caledonica'' (Gottsche ex Jack) Stephani**''Pleurozia curiosa'' Thiers**''Pleurozia heterophylla'' Stephani ex Fulford**''Pleurozia johannis-winkleri'' Herzog**''Pleurozia paradoxa'' (Jack) Schiffner**''Pleurozia subinflata'' (Austin) Austin*Unplaced**''Pleurozia pocsii'' Müller
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