WForpus is a genus of neotropical parrots in the family Psittacidae.
WHyriidae is a taxonomic family of pearly freshwater mussels, aquatic bivalve molluscs in the order Unionida. This family is native to South America, Australia, New Zealand and New Guinea. Like all members of that order, they go through a larval stage that is parasitic on fish.
WThe class Mesotardigrada has only one species, Thermozodium esakii. The animal has six claws of equal length at each foot. This species was recorded in 1937 by Rahm from a hot spring near Nagasaki in Japan. The type location has been destroyed by an earthquake and subsequent searches for specimens have been unsuccessful. The type specimen has also been lost, so the status of this class is considered dubious. However, Grothman et al. (2017) suggests that a type specimen was never collected, in line with lax taxonomic standards of the 1930s. Grothman et al. (2017) also suggests that they might have been misinterpreted heterotardigrades, possibly belonging to either Carphania or Oreella.
WSalinella salve is a dubious species of very simple animal that may not exist, but which some have named as the sole member of the phylum Monoblastozoa. It was discovered in 1892 by Johannes Frenzel in the salt pans of Argentina and cultivated in a laboratory by him. This animal has not been found since and its real existence is considered as doubtful.
WPolymastiidae is a family of demosponges found in oceans throughout the world. It is the only family in the monotypic order Polymastiida. A useful diagnostic characteristic of members of this family is the presence of numerous surface papillae although this feature is shown by some other sponges.
WPolypodium is a genus of parasite attacking the eggs of sturgeon and similar fishes. It is one of the few metazoans (animals) that live inside the cells of other animals.
WPtychophorae is a suborder of rhizostome jellyfish, identified in 2013 by Gershwin and Davie.
WGolfingiida is an order of peanut worms. The tentacles form a circle around the mouth whereas those of the sister taxon, Phascolosomatidea, are only found above the mouth. Most species burrow in the substrate but some live in the empty shells of gastropods. It is the only order in the monotypic class Sipunculidea and contains the following families:Golfingiidae Phascolionidae Sipunculidae Rafinesque, 1814 Themistidae