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Phacopina
The Phacopina comprise a suborder of the trilobite order Phacopida. Species belonging to the Phacopina lived from the Lower Ordovician (Tremadocian) through the end of the Upper Devonian (Famennian).Moore, R.C. (ed.). Treatise on Invertebrate Paleontology. Part O – Arthropoda (Trilobitomorpha). 1959 The one unique feature that distinguishes Phacopina from all other trilobites are the very large, separately set lenses without a common cornea of the compound eye. Habitat As far as currently known, all Phacopina species were marine bottom-dwellers. Origin The Early Ordovician genus '' Gyrometopus'' (superfamily Dalmanitoidea, family Diaphanometopidae) is probably close to the common ancestor of the Phacopina. ''Gyrometopus'' is phacopid in appearance, but a rostral plate is present, unlike in other Phacopina. However, the rostral plate does not divide the cephalic doublure into a left and right section, but instead the rostral suture defines a semicircle in the frontal ¾ of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phacopida
Phacopida ("lens-face") is an order of trilobites that lived from the Late Cambrian to the Late Devonian. It is made up of a morphologically diverse assemblage of taxa in three related suborders. Characteristics Phacopida had 8 to 19 thoracic segments and are distinguishable by the expanded glabella, short or absent preglabellar area, and schizochroal (Phacopina) or holochroal (Cheirurina and Calymenina) eyes. Schizochroal eyes are compound eyes with up to around 700 separate lenses. Each lens has an individual cornea which extended into a rather large sclera. The development of schizochroal eyes in phacopid trilobites is an example of post-displacement paedomorphosis. The eyes of immature holochroal Cambrian trilobites were basically miniature schizochroal eyes. In Phacopida, these were retained, via delayed growth of these immature structures (post-displacement), into the adult form. '' Eldredgeops rana'' (Phacopidae) and '' Dalmanites limulurus'' (Dalmanitidae) are two ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trilobite
Trilobites (; meaning "three-lobed entities") are extinction, extinct marine arthropods that form the class (biology), class Trilobita. One of the earliest groups of arthropods to appear in the fossil record, trilobites were among the most successful of all early animals, existing in oceans for almost 270million years, with over 22,000 species having been described. Because trilobites had wide diversity and an easily fossilized mineralised exoskeleton made of calcite, they left an extensive fossil record. The study of their fossils has facilitated important contributions to biostratigraphy, paleontology, evolution, evolutionary biology, and plate tectonics. Trilobites are placed within the clade Artiopoda, which includes many organisms that are morphologically similar to trilobites, but are largely unmineralised. The relationship of Artiopoda to other arthropods is uncertain. Trilobites evolved into many ecological niches; some moved over the seabed as predators, scavengers, or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phacops Rana Crassituberulata Dorsal
''Phacops'' is a genus of trilobites in the order Phacopida, family Phacopidae, that lived in Europe, northwestern Africa, North and South America and China from the Late Ordovician until the very end of the Devonian, with a broader time range described from the Late Ordovician.''Phacops'' at .org It was a rounded animal, with a globose head and large eyes, and probably fed on . ''Phacops'' is often found rolled up (""), a b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trilobita
Trilobites (; meaning "three-lobed entities") are extinction, extinct marine arthropods that form the class (biology), class Trilobita. One of the earliest groups of arthropods to appear in the fossil record, trilobites were among the most successful of all early animals, existing in oceans for almost 270million years, with over 22,000 species having been described. Because trilobites had wide diversity and an easily fossilized mineralised exoskeleton made of calcite, they left an extensive fossil record. The study of their fossils has facilitated important contributions to biostratigraphy, paleontology, evolution, evolutionary biology, and plate tectonics. Trilobites are placed within the clade Artiopoda, which includes many organisms that are morphologically similar to trilobites, but are largely unmineralised. The relationship of Artiopoda to other arthropods is uncertain. Trilobites evolved into many ecological niches; some moved over the seabed as predators, scavengers, or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phacops Rana Crassituberculata Eye 3
''Phacops'' is a genus of trilobites in the order Phacopida, family Phacopidae, that lived in Europe, northwestern Africa, North and South America and China from the Late Ordovician until the very end of the Devonian, with a broader time range described from the Late Ordovician.''Phacops'' at .org It was a rounded animal, with a globose head and large eyes, and probably fed on . ''Phacops'' is often found rolled up (""), a b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gyrometopus
''Gyrometopus'' is an extinct genus from a well-known class of fossil marine arthropods, the trilobites. It lived during the Arenig stage of the Ordovician Period, approximately 479 to 472 million years ago. Description The central raised area (or glabella) is flattened and its front is slightly expanded. There are 3 pairs of faint and narrow furrows that define lateral lobes. The lip (or rostral plate), the part of the doublure on the midline, is semicircular and the left and right sutures connect before reaching the inner margin of doublure. The articulate midlength part of the exoskeleton (or thorax) has 11 segments, which are divided by narrow pleural furrows. The margin of the tailshield (or pygidium The pygidium (: pygidia) is the posterior body part or shield of crustaceans and some other arthropods, such as insects and the extinct trilobites. In groups other than insects, it contains the anus and, in females, the ovipositor. It is compos ...) is entire, and the fro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acastoidea
Acastoidea is a superfamily of trilobites from the order Phacopida, suborder Phacopina. This superfamily is divided into two families, Acastidae and Calmoniidae. This superfamily is distinguishable from the Phacopidae in that eyes are closer to the glabella The glabella, in humans, is the area of skin between the eyebrows and above the nose. The term also refers to the underlying bone that is slightly depressed, and joins the two brow ridges. It is a cephalometric landmark that is just superior ... and that the glabella has lobes, unlike the genera in Phacopidae. Acastoidea was first proposed by T.J.A. Reijers in 1972. References Phacopina Trilobite superfamilies {{phacopida-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diaphanometopidae
Diaphanometopidae is a family of trilobites. Its representatives lived during the Arenig and Llanvirn stages of the Ordovician Period, approximately 479 to 463 million years ago.Moore, R. C. (ed.). Treatise on Invertebrate Paleontology. Part O – Arthropoda (Trilobitomorpha). 1959 The Diaphanometopidae are thought to have been an early transitional group between the Ptychopariida ancestors and all other Phacopina. Diaphanometopidae, are found in the Lower and Middle Ordovician of Sweden and Russia. Three species are assigned to this family: ''Diaphanometopus volborthi'' that has been found in the Dapingian of Baltica, ''Gyrometopus lineatus'' occurring in the Floian of Baltica and ''Prodalmanitina nikolaevi'' that is known from the Floian of Kolyma. These species have many ancestral characters compared to other Phacopina, but they do not seem to be each other's nearest relatives, which makes it unlikely this family will be maintained when the phylogeny A phylogenetic tree o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dalmanitoidea
Dalmanitoidea is a superfamily of trilobites in the order Phacopida, containing the three families Dalmanitidae Dalmanitidae is a family of trilobites in the order Phacopida that lived from the Floian (Ordovician) to the Devonian and includes 33 genera. References Dalmanitidae, Dalmanitoidea Trilobite families Early Ordovician first appearances ..., Diaphanometopidae and Prosopiscidae. References Phacopina Trilobite superfamilies {{Phacopida-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Odontochile Sp Lateral
''Odontochile'' is a genus of trilobites in the order Phacopida, family Dalmanitidae.Struve, W. Suborder Phacopina, p. O471-O472. ''in'' Moore, R.C. (ed.). Treatise on Invertebrate Paleontology. Part O – Arthropoda (Trilobitomorpha). 1959 These trilobites were fast-moving low-level epifauna and detritivore. They lived in the Devonian period, from 414 to 391 million years ago. Distribution Silurian of China; Silurian to Devonian of Australia and the United States; Devonian of Algeria, Canada, the Czech Republic, France, Germany, Kazakhstan, Morocco and Spain. Description ''Odontochile'' is genus of trilobites with a large (about long), moderately vaulted exoskeleton with an inverted egg-shaped outline (about 1.6× longer than wide). Its headshield (or cephalon) is semicircular, with long (genal) spines extending from the side of the cephalon back to the tailshield (or pygidium). The frontal margin of the cephalon is semicircular to parabolic, and lacks an anterior extensio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Huntoniatonia
''Huntoniatonia'' is genus of trilobites, an extinct group of marine arthropods of average to large size (up to 15 cm long). Description Like all sighted Phacopina, ''Huntoniatonia'' has eyes with relatively large, individually set calcite lenses (so-called schizochroal eyes). The natural fracture lines coming from the back of the eye, cross the margin of the headshield (or cephalon) to the side (or proparian sutures in science jargon). From the front of the eye the sutures from both sides run along the edge of the central raised area (or glabella) into each other, and do not cross the margin of the cephalon, resulting in yoked free cheeks (or librigenae). Like in all Dalmanitidae, the articulated midsection of the body (or thorax) has 11 segments. The cephalon of ''Huntoniatonia'' has a broad, flat frontal margin, with an extension to the front, a bit like a dolphin. The frontal lobe of the moderately convex glabella is much wider and longer than the other three pairs ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Calmoniidae
Calmoniidae is a family of trilobites from the order Phacopida Phacopida ("lens-face") is an order of trilobites that lived from the Late Cambrian to the Late Devonian. It is made up of a morphologically diverse assemblage of taxa in three related suborders. Characteristics Phacopida had 8 to 19 thoraci ..., suborder Phacopina, superfamily Acastoidea. It contains the following genera: *'' Anchiopella'' *'' Andinacaste'' *'' Australocaste'' *'' Australops'' *'' Awaria'' *'' Bainella'' *'' Belenops'' *'' Bouleia'' *'' Calmonia'' *'' Chiarumanipyge'' *'' Clarkeaspis'' *'' Cryphaeoides'' *'' Curuyella'' *'' Deltacephalaspis'' *'' Eldredgeia'' *'' Feistia'' *'' Hadrorachus'' *'' Jujuyops'' *'' Kozlowskiaspis'' *'' Malvinella'' *'' Malvinocooperella'' *'' Metacryphaeus'' *'' Morocconites''Edgecombe, G.D. Morocconites Struve, 1989, A Devonian Acastine Trilobite (Calmoniidae: Acastinae. ''American Museum Novitates'', Number 299/ref> *'' Oosthuizenella'' *'' Palpebrops'' *'' Par ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
