| Paraceratites elegans Temporal range: | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | † Ammonoidea |
| Order: | † Ceratitida |
| Family: | † Ceratitidae |
| Genus: | † Paraceratites |
| Species: | †P. elegans |
| Binomial name | |
| †Paraceratites elegans (Mojsisovics, 1882) [1] | |
| Synonyms [2] | |
† Ceratites elegans Mojsisovics, 1882 | |
Paraceratites elegans is an extinct species of ammonite cephalopod in the family Ceratitidae. It is known from the Triassic of China and Israel.
The Triassic is a geologic period and system which spans 50.6 million years from the end of the Permian Period 251.9 million years ago (Mya), to the beginning of the Jurassic Period 201.36 Mya. The Triassic is the first and shortest period of the Mesozoic Era. Both the start and end of the period are marked by major extinction events. The Triassic Period is subdivided into three epochs: Early Triassic, Middle Triassic and Late Triassic.
Aeger is a genus of fossil prawns. They first occur in the Middle Triassic, and died out at the end of the Late Cretaceous. A total of 21 species are known.
Saurichthys is an extinct genus of predatory ray-finned fish from the Triassic period. It type genus family Saurichthyidae, and the largest and longest lasting genus in the family. This family also includes the Permian Eosaurichthys (China) and the Jurassic Saurorhynchus from Europe and North America, though it may be more appropriate to treat these as subgenera of Saurichthys, due to the genus Saurichthys otherwise being paraphyletic.
Semionotus is an extinct genus of ray-finned fish found throughout Northern Pangaea during the late Triassic, becoming extinct in the Early Jurassic.
Ceratodus is an extinct genus of lungfish. It has been described as a "catch all", and a "form genus" used to refer to the remains of a variety of lungfish belonging to the extinct family Ceratodontidae. Fossil evidence dates back to the Early Triassic. A wide range of fossil species from different time periods have been found around the world in places such as the United States, Argentina, Greenland, England, Germany, Egypt, Madagascar, China, and Australia. Ceratodus is believed to have become extinct sometime around the beginning of the Eocene Epoch.
Ceratites is an extinct genus of ammonite cephalopods. These nektonic carnivores lived in marine habitats in what is now Europe, during the Triassic, from the upper-most Anisian to the lower Ladinian age.
Rhabdoderma is an extinct genus of coelacanth fish in the class Sarcopterygii. It lived in the Carboniferous and Early Triassic, and its fossils have been found in Europe, Madagascar and North America.
Dictyocephalus is an extinct genus of prehistoric temnospondyls; the only species is Dictyocephalus elegans. This taxon was one of the first metoposaurids to be discovered in North America, being discovered by Ebeneezer Emmons and briefly described by Joseph Leidy in 1856 in the Newark supergroup exposures of Chatham County, North Carolina. At the time, Leidy was uncertain of much of the anatomy of D. elegans, which is represented only by a small partial skull and made only brief descriptions and measurements of a few elements, with an estimated size based on the long-snouted trematosaur Trematosaurus. Emmons provided the first figures of the specimen the following year. Romer (1947) briefly mentioned that the specimen was indistinguishable from "Buettneria" (Koskinonodon). The taxon was not revisited in much detail until the revision of the Metoposauridae by Ned Colbert and John Imbrie in 1956. These authors pointed out that many of the features listed by Leidy to be diagnostic for D. elegans were too generic to either make comparisons or to prove its specific affinities. Chowdhury (1965) did not formally place D. elegans within the Metoposauridae. Subsequent authors proposed that D. elegans might represent a juvenile of a specific taxon, but uncertainty resulted from interpretations of the absence an otic notch and a tabular horn, features seen in larger metoposaurids. Joseph Gregory suggested that it specifically represented a juvenile of Metoposaurus but indicated a preference to maintain the name in a form restricted to the holotype and to designate it as a nomen vanum. Beth Davidow-Henry re-appraised the holotype in light of new material of small metoposaurids. She pointed out that if the absence of otic notches was considered to be a defining feature, then D. elegans would probably be synonymous with Anaschisma from Wyoming, but refrained from formalizing this in the absence of information regarding changes to the otic notch during development. Dictyocephalus was thus maintained as a valid genus of metoposaurids with shallow otic notches. The most recent revision of the metoposaurids by Adrian Hunt stated that the holotype was too fragmentary to be diagnostic and designated D. elegans as a nomen dubium within Temnospondyli
Platycraniellus is an extinct genus of carnivorous cynodonts from the Early Triassic. It is known from the Lystrosaurus Assemblage Zone of the Normandien Formation in South Africa. P. elegans is the only species in this genus based on the holotype specimen from the Ditsong National Museum of Natural History in Pretoria, South Africa. Due to limited fossil records for study, Platycraniellus has only been briefly described a handful of times.
D. elegans may refer to:
Matoniaceae is one of the three families of ferns in the Gleicheniales order of the Polypodiopsida class. Fossil records reveal that Matoniaceae ferns were abundant during the Mesozoic era, during which they lived on every continent, including Antarctica, with eight genera and 26 species, with the oldest known specimens being from the Middle Triassic of Antarctica. Today the family is much less abundant, and also less diverse, with only two extant genera and four species, which are limited to portions of southeastern Asia.
Polycynodon is an extinct genus of therocephalians from the Late Permian of South Africa. It is known from the Cistecephalus Assemblage Zone. The type species was first described as Octocynodon elegans by South African paleontologist Robert Broom in 1940, but the name Octocynodon was preoccupied by a genus of labrid fish first described in 1904. Along with John T. Robinson, Broom instated Polycynodon as a replacement name for O. elegans in 1948. Polycynodon is classified in Baurioidea, although its relationship to other baurioid therocephalians is uncertain.
Diegocanis is an extinct genus of cynodonts from the Late Triassic (Carnian) of Argentina. The type species, Diegocanis elegans, was named in 2013 from fossils found in the Cancha de Bochas Member of the Ischigualasto Formation in the Ischigualasto-Villa Unión Basin. Diegocanis was classified within a new family of probainognathian cynodonts called Ecteniniidae, along with the genera Ecteninion and Trucidocynodon.
Paraceratites is an extinct genus of ammonite cephalopods in the family Ceratitidae.
C. elegans most commonly refers to the model round worm Caenorhabditis elegans. It may also refer to any of the species below. They are listed, first in taxonomic order and, second, alphabetically.
Cheilotomona is an extinct genus of prehistoric marine gastropods in the family Goniasmatidae. The species C. elegans is from a Pelsonian/Illyrian marine shale/marl in the Triassic Qingyan Formation of Guizhou Province, China.
Cubanothyris is an extinct genus of prehistoric brachiopods in the extinct family Angustothyrididae. Species are from the Triassic of China, the Russian Federation and Tajikistan. The type species, C. elegans, is found only at River Kuna.
Nemacanthus is an extinct genus of prehistoric sharks in the family Palaeospinacidae.
The Normandien Formation is a Triassic-age rock formation located in Free State, South Africa. It is where the fossils of Ericiolacerta, a subtaxa of Ericiolacertidae, were found.
Palissyales are an extinct order of conifers, known from the Mesozoic. They are best known from the genus Palissya, which is found in Laurasia and Eastern Gondwana dating from the Late Triassic to Early Cretaceous. The only other confirmed genus of the family, Stachyotaxus known from the Late Triassic of the Northern Hemisphere. The genus Knezourocarpon from the Jurassic of Australia has also been tentatively considered a member of the order. The cone of the best known genus Palissya is noted for its unusual construction, which is borne on a large bract, and consists of two parallel rows of ovules that run along the midline of the adaxial surface of the bract which are encased in cup-like structures formed by scales. The bracts are helically arranged around an axis, forming a compound catkin-like structure. The seeds are thin-walled were likely only viable for a short period of time, and were likely adapted to wind dispersal. Palissya has been considered in some aspects to be similar to some Paleozoic Voltziales, as well as Taxaceae and Podocarpaceae.
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