Pleurozia
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: