| Eutrichiurides Temporal range: | |
|---|---|
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | Scombriformes |
| Family: | Trichiuridae |
| Genus: | † Eutrichiurides Casier, 1944 |
Eutrichiurides is an extinct genus of prehistoric cutlass fish. [1] [2]
Similar and related genera include the extant Aphanopus , Trichiurides and Trichiurus . [3] These fishes lived in the Eocene period, from 55.8 to 48.6 mya. [3]
Species within this genus include: [4]
Eutrichiurides species were very similar in form and build to modern snake mackerels, in that they were long and slender, blade-shaped fishes with elongated jaws possessing fangs and needle-shaped teeth. [5]
Fossils of Eutrichiurides have been found the Eocene fossil sediments of India, Pakistan and the United Kingdom. [3]
Basilosaurus is a genus of large, predatory, prehistoric archaeocete whale from the late Eocene, approximately 41.3 to 33.9 million years ago (mya). First described in 1834, it was the first archaeocete and prehistoric whale known to science. Fossils attributed to the type species B. cetoides were discovered in the United States. They were originally thought to be of a giant reptile, hence the suffix "-saurus", Ancient Greek for "lizard". The animal was later found to be an early marine mammal, prompting attempts at renaming the creature, which failed as the rules of zoological nomenclature dictate using the original name given. Fossils were later found of the second species, B. isis, in 1904 in Egypt, Western Sahara, Morocco, Jordan, Tunisia, and Pakistan. Fossils have also been unearthed in the southeastern United States and Peru.
Megacerops is an extinct genus of the prehistoric odd-toed ungulate family Brontotheriidae, an extinct group of rhinoceros-like browsers related to horses. It was endemic to North America during the Late Eocene epoch, existing for approximately 4.1 million years.
Palaeosyops is a genus of small brontothere which lived during the early to middle Eocene.
Isurus is a genus of mackerel sharks in the family Lamnidae, commonly known as the mako sharks. They are largely pelagic, fast predatory fish capable of swimming at speeds up to 50 km/h (31 mph).
Carcharias is a genus of mackerel sharks belonging to the family Odontaspididae. Once bearing many prehistoric species, all have gone extinct with the exception of the critically endangered sand tiger shark.
Paleontology or palaeontology is the study of prehistoric life forms on Earth through the examination of plant and animal fossils. This includes the study of body fossils, tracks (ichnites), burrows, cast-off parts, fossilised feces (coprolites), palynomorphs and chemical residues. Because humans have encountered fossils for millennia, paleontology has a long history both before and after becoming formalized as a science. This article records significant discoveries and events related to paleontology that occurred or were published in the year 1986.
Odontaspis and Greek: ἀσπίς aspís 'shield') is a genus of sand shark with two extant species.
Cristigerina is an extinct genus of prehistoric marine perciform fish that lived during the Eocene. It contains a single species, C. crassa from the early Ypresian of Belgium.
Elonichthys is an extinct genus of prehistoric bony fish. The genus is represented by several species from Carboniferous and Permian of Europe, Greenland, South Africa, and North America.
Eosalmo is an extinct genus of ancient salmonid that lived during the Eocene epoch.
Burtinia is an extinct genus of prehistoric seabream that lived during the middle Eocene. It contains a single species, B. bruxelliensis from the Lede Formation of Belgium.
Mioplosus is an extinct genus of percid fish that lived from the early to middle Eocene. Five species of the genus has been described, Mioplosus labracoides is found in the Green River Formation Lagerstätte. Mioplosus has numerous extant relatives in Northern Hemisphere fresh- and brackish water, as well as fossil relatives in Asia, Europe and New Zealand, and may be closely related to the modern-day pike-perches.
Acanthopygaeus is an extinct genus of prehistoric marine perciform fish in the family Siganidae. It is known from the Eocene lagerstätte "Pesciara" in Bolca, Italy.
Aglyptorhynchus is an extinct genus of prehistoric marine billfish that was distributed worldwide from the early Eocene to the early Miocene. Fossils are primarily known from the Northern Hemisphere, but one species is also known to have inhabited the waters off New Zealand.
Ctenodentex is an extinct genus of prehistoric seabream from the middle Eocene of Europe. It contains a single species, C. laekeniensis, from the Bartonian-aged Wemmel Member of the Maldegem Formation in Belgium. It was initially described as Dentex laekeniensis before being placed in its own genus, Ctenodentex, although some authors continue to classify it in Dentex.
Diaphyodus is an extinct genus of prehistoric marine ray-finned fish, generally considered a drumfish, from the Late Paleocene and Eocene, and potentially to the mid-Oligocene of Europe and North America.
Cylindracanthus is an extinct, enigmatic genus of marine ray-finned fish with fossils known throughout North America, Europe, Asia and Africa from the Late Cretaceous to the late Eocene, with potential Oligocene records and a possible Miocene record also known. It is exclusively known from its distinctive partial remains, which are long cylindrical bony spines that are usually considered rostrum fragments, as well as some associated teeth. These spines are abundant & widespread throughout this timespan, and are useful indicators of a nearshore marine environment, but the taxonomic identity of the fish is still highly uncertain and debated.
Sparnodus is an extinct genus of prehistoric perciform fish in the family Sparidae. Species of this genus were nektonic carnivores. These fishes lived in the Cenozoic Era, in the Oligocene and Paleocene.
Hemicalypterus is an extinct genus of prehistoric ray-finned fish that lived during the late Triassic period. It contains a single species, Hemicalypterus weiri. Fossils have been collected in the southwestern United States, including Utah and New Mexico. Hemicalypterus belonged to the family Dapediidae, and like other members of its family, it was a deep-bodied fish with a covering of thick ganoid scales. It differed from other dapediids in lacking scales on the posterior part of the body, and in possessing unusual, multicuspid teeth. These teeth were similar to those of modern-day herbivorous fish, which indicates that Hemicalypterus may have been a herbivore as well.
Serratolamna is an extinct genus of mackerel sharks that is placed in the monotypic family Serratolamnidae.
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