Ypresian genera

The moonfish of the genus Mene, the sole extant genus of the family Menidae, are disk-shaped fish which bear a vague resemblance to gourami, thanks to their lateral compression and thread-like pelvic fins. Today, the genus is represented only by Mene maculata of the Indo-Pacific, where it is a popular food fish, especially in the Philippines, where it is known as bilong-bilong, chabita, hiwas or tahas.

Diplomystus is an extinct genus of freshwater and marine clupeomorph fish distantly related to modern-day extant herrings, anchovies, and sardines. It is known from the United States, Canada, China, Uzbekistan and Lebanon from the Late Cretaceous to the middle Eocene. Many other clupeomorph species from around the world were also formerly placed in the genus, due to it being a former wastebasket taxon. It was among the last surviving members of the formerly-diverse order Ellimmichthyiformes, with only its close relative Guiclupea living for longer.

Amphistium paradoxum (from , 'on both sides', 'sail', and 'extraordinary'), the only species classified under the genus Amphistium and the family Amphistiidae, is a fossil fish which has been identified as a Paleogene relative of the flatfish, and as a transitional fossil. In a typical modern flatfish, the head is asymmetric with both eyes on one side of the head. In Amphistium, the transition from the typical symmetric head of a vertebrate is incomplete, with one eye placed near the top of the head.

Eosalmo is an extinct genus of ancient freshwater salmonid with a single described species Eosalmo driftwoodensis. The genus lived during the Eocene epoch and has been recovered from late Ypresian fossils in the Eocene Okanagan Highlands of the northwestern United States and western Canada. Additional fossils briefly mentioned as Eosalmo were reported from Russia, but they have not received close taxonomic treatment since. E. driftwoodensis is used as a phylogenetic calibration point for studies of the relationships in Salmonidae and Salmoniformes. Based on preservation of juvenile to adult sp

Eolactoria ("dawn Lactoria") is an extinct genus of highly unusual prehistoric boxfish from the Eocene. It contains a single species, E. sorbinii from the Ypresian-aged Monte Bolca site in Italy. left|thumb|Life restoration It had two pairs of long spines, one over each eye, and one pair beneath the anal and caudal fins, arranged very similarly to those possessed by the modern genus Lactoria (e.g., "cowfish"), but much longer. E. sorbinii had a fifth spine between the two eye-spines, arranged and looking very much like a nose.

Blochius is an extinct genus of billfish from the Eocene. It is only known from the Monte Bolca deposits in Italy, and was likely restricted to shallow, tropical waters of the Tethys Ocean.

Acanthonemus (from , 'spine' and 'to distribute' or 'covered') is an extinct genus of prehistoric marine ray-finned fish that lived from the early Eocene. It contains a single species, A. subaureus (synonyms: A. bertrandi Agassiz, 1834, A. filamentosus Agassiz, 1834), known from the famous Monte Bolca site in Italy. It is the only genus in the extinct family Acanthonemidae.

Eobothus ('dawn Bothus') is an extinct genus of very small, fossil marine flatfish known from the Eocene. It is one of the oldest flatfish known from fossil remains.

Eosphargis (from Greek eos, meaning "dawn", and sphargis, the Greek word for the leatherback turtle) is an extinct genus of sea turtles from the late Paleocene and early Eocene of western Europe and eastern North America. It is a member of the family Dermochelyidae, which also includes the modern leatherback sea turtle (Dermochelys coriacea), of which it is the earliest known definitive member.

Eastmanalepes (meaning "Eastman's scale) is an extinct genus of prehistoric jackfish known from the Eocene of Europe. It contains a single species, E. primaevus, known from the late Ypresian of the Monte Bolca site in Italy. It was originally described as a species of the jackfish genus Caranx, which it has a superficially similar outline to. However, it differs from Caranx, and almost all other jackfish, in that it has very large, very pronounced scutes along its lateral line. According to Bannikov, E. primaevus is probably more related to the extinct jackfish genera, Eothynnus and Teratichth

Asineops is an enigmatic genus of extinct freshwater ray-finned fish from the Eocene. It is the only member of the family Asineopidae and contains a single species, A. squamifrons, from the famous Green River Formation of Colorado, Wyoming, and Utah. It was described by Edward Drinker Cope in 1870. The name comes from the Greek for "donkey-faced".

Eozanclus ("dawn Zanclus") is an extinct genus of marine ray-finned fish, closely related to the modern Moorish idol, that lived during Eocene. It contains a single species, E. brevirostris that lived during the late Ypresian epoch in what is now Monte Bolca, northern Italy. It is one of two known fossil Moorish idols from Monte Bolca alongside Angiolinia. It differs from its living relative by having a much shorter snout.

Coelogaster is an extinct genus of marine ray-finned fish that lived during the early Eocene. It contains a single species, C. leptostea, known from the famous Monte Bolca site of Italy.

Crossopholis is an extinct paddlefish known from the early Eocene (Ypresian) of North America, approximately 52 million years ago. It is a close relative of the contemporary American paddlefish, though it is thought to have been a fish-eater like the Chinese paddlefish rather than a filter feeder.

Ceratoichthys is an extinct genus of lookdown-like prehistoric jackfish that lived during the late Ypresian epoch, of the Early Eocene. It contains a single species, C. pinnatiformis of Monte Bolca, Italy. It and Vomeropsis are the only known members of the extinct subfamily Vomeropsinae.

Plastomenus is an extinct genus of turtle that inhabited western North America during the early Paleogene period.

Fistularioides (meaning "Fistularia-like") is an extinct genus of prehistoric marine syngnathiform fish that lived during the Early Eocene of Europe. It is known from two species, F. veronensis Blot, 1980 and F. phyllolepis Blot, 1980 from the Monte Bolca site of Italy. left|thumb|Closeup of skull As its name suggests, it superficially resembled and was related to the cornetfishes, though it belonged to its own extinct family, the Fistularioididae. It is one of two known genera from this family, alongside Pseudosyngnathus from the same locality.

Phymosoma is an extinct genus of echinoids that lived from the Cretaceous to the Eocene. Its remains have been found in Asia, Europe, and North America. thumb|left|Syngnathid and Phymosoma granulosum fossils at the Geological Museum in Copenhagen