Ypresian extinctions

Plesiadapis (near Adapis) is an extinct genus of mammal closely related to primates, found in North America and western Europe. The type species, P. tricuspidens, was described in 1877 by François Louis Paul Gervaise, based on a partial left mandible (lower jaw) uncovered in France. Fourteen valid species have since been named.

Phosphatherium escuilliei, named by Gheerbrant, Sudre and Cappetta in 1996, is a basal proboscidean that lived in Africa during the Early Eocene, about 56-55 Ma. It is one of the earliest known proboscideans, together with Eritherium azzouzorum from the Selandian (about 60 Ma). It was found in phosphorites beds from the base of the Ypresian stage of the Ouled Abdoun Basin, which is best known for its exceptionally rich marine vertebrate fauna.

Hapalodectes (literal translation 'soft biter'; from ('soft, tender') and ('biter')) is an extinct genus of otter-like mesonychians from the Late Paleocene to Early Eocene, some 55million years ago. Although the first fossils were found in the Eocene strata of Wyoming, the genus originated in Mongolia, as the oldest species is H. dux, which was found in Late Paleocene strata in the Naran Bulak Formation. left|thumb|Life restoration of H. serus The genus was once suggested to be related to the Archaeoceti, such as Pakicetus, due to numerous similarities between the skull and tooth anatomies of

Crossognathiformes is an extinct order of ray-finned fish that lived from the Late Jurassic to the Eocene. Its phylogenetic placement is disputed; some authors have recovered it as part of the teleost stem group, while others place it in a basal position within crown group Teleostei. Other placements have found it to be polyphyletic, with Varasichthyidae being stem-group teleosts whereas the other, "true" crossognathiforms are crown-group teleosts within Teleocephala.

Tethysuchia is an extinct clade of neosuchian mesoeucrocodylian crocodylomorphs from the late Middle Jurassic (Bathonian stage) to the Early Eocene (Ypresian stage) of Asia, Europe, North America and South America. It was named by the French paleontologist Eric Buffetaut in 1982 as a suborder. Tethysuchia was considered to be a synonym of Dyrosauridae or Pholidosauridae for many years. In most phylogenetic analyses the node Dyrosauridae+Pholidosauridae was strongly supported. De Andrade et al. (2011) suggested that Tethysuchia be resurrected for that node. They defined it as a node-based taxon

Palaeobalistum is an extinct genus of prehistoric ray-finned fish which ranged from the Cretaceous to Eocene periods.