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The Treatise on Invertebrate Paleontology published by the Geological Society of America and the University of Kansas Press, is a definitive multi-authored work of some 50 volumes, written by more than 300 paleontologists, and covering every phylum, class, order, family, and genus of fossil and extant invertebrate animals. The prehistoric invertebrates are described as to their taxonomy, morphology, paleoecology, stratigraphic and paleogeographic range. However, genera with no fossil record whatsoever have just a very brief listing.
Eophacops is a genus of trilobites from the order Phacopida, family Phacopidae. These trilobites lived during the Middle Silurian in what now are North America and North-West Europe. Species assigned to this genus can be distinguished from Phacops by their small size (2–3 cm). Eophacops has very large eyes compared to the rest of its body.
Agraulos is a genus of trilobite that lived during the Middle Cambrian in North America and Europe, particularly the Czech Republic. A. ceticephalus grew to approximately 1 inch or 2.5 centimetres.
Asaphus is a genus of trilobites, that is known from the Lower and Middle Ordovician of northwestern Europe.
Acaste is a genus of extinct trilobite of the order Phacopida which lived throughout the Silurian period. They are characterized by a convex dorsal surface, an absence of spines, a shortening of the head-shield and a general rounding off of all angles. Species include Acaste downingiae.
Crepicephalus is an extinct genus from a well-known class of fossil marine arthropods, the trilobites. It lived from 501 to 490 million years ago during the Dresbachian faunal stage of the late Cambrian Period.
Asaphiscus is a genus of trilobite that lived in the Cambrian. Its remains have been found in Australia and North America, especially in Utah.
Dienstina is a trilobite in the order Phacopida, that existed during the lower Devonian in what is now Germany. It was described by Richter and Richter in 1931, and the type species is Dienstina diensti, which the authors had originally assigned to the genus Phacopidella in 1923. The type locality was in Oberscheld, Rhenish Massif.
Aulacopleura is a genus of proetid trilobite that lived from the Middle Ordovician to the Middle Devonian. The cephalon is semicircular or semielliptical, with border and preglabellar field. The glabella is short, with or without defined eye ridges connecting it with eyes of variable size. Spines at the rear outer corners of the cephalon are present, typically reaching back to the 2nd to 4th thorax segment. The 'palate' is not connected to the dorsal shield of the cephalon. The cephalon is pitted, or has small tubercles. The thorax has up to 22 segments. The pleural ends are usually rounded. The pygidium is small (micropygous), with an even margin.
Ellipsocephalus is an extinct genus of blind trilobite that lived during the Cambrian. The genus comprises benthic species inhabiting deep, poorly lit or aphotic habitats. E. hoffi is a common trilobite mainly from central Europe.
Alokistocaridae is a family of ptychopariid trilobites that lived from the Botomian epoch of the Early Cambrian until the Late Cambrian. Alokistocarids were particle feeders and left small furrows with are occasionally preserved. Their remains are found worldwide. Elrathia kingii, one of the most collected trilobites in the world, is a typical alokistocarid.
Battus is a synonym for several agnostid trilobites, now assigned to other genera.
Entomostracites is a scientific name for several trilobites, now assigned to various other genera.
Westergaardites is an Upper Cambrian trilobite that is known from the Eastern Tian Shan. It is related to Triarthrus, but can easily be distinguished from it by an extremely long exoskeleton, anteriorly placed eyes, a thorax of 19 segments with an extremely wide axis, and very narrow pleural regions, pleural spines, and a pygidium with marginal spines.
Angelina is a genus of trilobite that lived during the Lower Ordovician. It is known from Wales and South America. It differs from most other Triarthrinae in being larger, with a relatively narrow central raised area of the headshield, with the occipital ring at the back of the glabella not well defined, and obscure lateral furrows. The eyes are placed midlength the headshield. The facial sutures converge on the front border at the midline. It also has very long and broad genal spines.
TrilobitesLink, 1807 is a disused genus of trilobites, the species of which are now all assigned to other genera.
TrilobusBruennich, 1781 is a disused genus of trilobites, the species of which are now all assigned to other genera.
ConocephalitesBarrande, 1852, is a disused name for a genus of trilobite, of which the species have now been reassigned to other genera. The name was introduced as a replacement for ConocephalusZenker, 1833, which was unavailable since Thunberg used it in 1815 for a genus of conehead bushcricket. Barrande however was unaware that Conocoryphe had already been proposed by Hawle and Corda in 1847.
ArionellusBarrande, 1850, is a disused name for a genus of trilobite. The name Arionellus was a replacement for ArionidesBarrande, 1847, itself a replacement for ArionBarrande, 1846, which was preoccupied because Férussac had already used it in 1819 for a genus of slugs.
Entomaspis is an extinct genus of harpetid trilobite from Upper Cambrian to Early Ordovician marine strata of the United States. Species are typified by their proportionally large, vaulted, croissant-shaped or bonnet-shaped cephalons that have the cheeks freed to become elongated, curved librigenial spines, and by their comparatively large, crescent-shaped eyes.
References
- ↑ Moore, R.C. (1959). Arthropoda I - Arthropoda General Features, Proarthropoda, Euarthropoda General Features, Trilobitomorpha. Treatise on Invertebrate Paleontology. Part O. Boulder, Colorado/Lawrence, Kansas: Geological Society of America/University of Kansas Press. pp. O298–O301. ISBN 0-8137-3015-5.
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