WArgyrotheca is a genus of very small to minute lampshells. All species share a large pedicel opening, one ridge on the inside of the pedunculate valve, pits in a diamond pattern on the inside of both valves, and without radial ridges that end in tubercles. It occurs in depths between 6 and 1300 m. It is known since the latest Cretaceous.
WCraniscus is a genus of small brachiopods. The shell is approximately round to square with one side rounded. The ventral valve is approximately flat and attached to the underground by the entire surface. The outside of the dorsal valve is more or less conical, the inside is divided by three ridges that join in the center.
WDallina is a genus of small to average size lampshells. It is known since the Miocene.
WEstlandia is a gonambonitid taxonomic rank (genus). It is one of the endemic brachiopods in the Ordovician of Baltoscandia. Currently, eight different species and subspecies of the genus have been recorded from the Aseri to Keila stages.
WFrenulina is an extant genus of brachiopods, known from shallow waters in the warmer parts of the Pacific and Indian Oceans. Its shell is biconvex, rounded pentagonal in profile, and dependent on the species scarlet with creamy white radiating stripes of quickly varying width, beige or seldomly entirely white. It lives attached by a stalk to a hard underground.
WGwynia is a genus of very small to minute brachiopods.
WLingula is a genus of brachiopods within the class Lingulata. Lingula or forms very close in appearance have existed possibly since the Cambrian. Like its relatives, it has two unadorned organo-phosphatic valves and a long fleshy stalk. Lingula lives in burrows in barren sandy coastal seafloor and feeds by filtering detritus from the water. It can be detected by a short row of three openings through which it takes in water (sides) and expels it again (middle).
WNovocrania is a genus of brachiopods found off shore.
WPeltandra, the arrow arums, is a genus of plants in the family Araceae. It is native to the eastern United States, eastern Canada, and Cuba.SpeciesPeltandra sagittifolia - (Michx.) Morong - Spoon flower or the white arrow arum - southeastern US from eastern Louisiana to Virginia Peltandra virginica (L.) Schott - Arum arrow - Cuba, Quebec, Ontario, Oregon, California, Washington; eastern US from Maine to Florida, west to Texas, Kansas, and Minnesota †Peltandra primaeva – Eocene, Golden Valley Formation, North Dakota, USA