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Phacopidae
Phacopidae is a family (biology), family of Phacopida, phacopid trilobites that ranges from the Lower Ordovician to the Upper Devonian, with representatives in all Supercontinents, paleocontinents. Description As in all Phacopina, the eyes (if present) consist of very large (0.5 mm in ''Phacops rana''), separately set lenses without a common cornea (so called Trilobite#Eyes, schizochroal eyes). However, several phacopids have very few lenses, such as the species of the genus, genera ''Cryphops'', ''Denckmannites'', ''Dienstina'', ''Eucryphops'', ''Nephranops'', and ''Plagiolaria'', or lack eyes altogether, like ''Afrops'', ''Dianops'', ''Ductina'', and ''Trimerocephalus''. The natural fracture lines (sutures) of the head run along the top edges of the compound eye. From the back of the eye these cut to the side of the head (Trilobite#Dorsal sutures, proparian) and not to the back. In front of the eye, the right and left facial sutures connect in front of the inflated glabel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ductina Vietnamica 2 Frontal
''Ductina'' is a genus of extinct, small to average sized, eyeless Phacopida, phacopid Trilobita, trilobite, that lived during the Devonian. Description The body of ''Ductina'' is small to average (up to ), to 2 times as long as wide, blunted oval. Body without any adornment. The headshield (or Cephalon (arthropod head), cephalon) is 2 to 3 times as wide as it is long in the direction of the axis (or sagittally). The cephalic axis (or Cephalon (arthropod head), glabella) is strongly widening forward with shallow furrows, the front curving downward to end at an approximate straight angle to the plain of the axis. Another shallow furrow (the occipital furrow), with left and right a deep pit (apodemal pit), crosses to the back of the glabella to define a narrow band (or Cephalon (arthropod head)#Trilobites, occipital ring), and just in front left and right a small lobe is defined by shallow furrows and a deep pits. The back of the cephalon is often broken, obscuring the features ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phacops Rana Crassituberculata Eye 2
''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 ... [...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] |
Cryphops
''Cryphops'' is an extinct genus of trilobite in the family Phacopidae Phacopidae is a family (biology), family of Phacopida, phacopid trilobites that ranges from the Lower Ordovician to the Upper Devonian, with representatives in all Supercontinents, paleocontinents. Description As in all Phacopina, the eyes (if .... There are at least three described species in ''Cryphops''. Species These three species belong to the genus ''Cryphops'': * † ''Cryphops cryphoides'' * † ''Cryphops cryptophthalmus'' * † ''Cryphops tripartitus'' References Phacopidae Phacopida genera Articles created by Qbugbot {{phacopida-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chotecops
''Chotecops'' is a genus of trilobites from the order Phacopida, suborder Phacopina, family Phacopidae. It was initially erected as a subgenus of ''Phacops'' but some later authors thought it distinctive enough to raise its status. Species assigned to this genus occur between the Emsian and the Famennian. ''Chotecops'' is the most abundant trilobite in the Hunsrück Slate and due to the excellent preservation, often soft tissue such as antennae and legs have been preserved as a thin sheet of pyrite. Description Like in all sighted Phacopina, the eyes of ''Chotecops'' are compounded of very large, separately set lenses without a common cornea (so called schizochroal eyes), and like almost all other Phacopina, the articulate mid-length part of the body (or thorax) in ''Chotecops'' has 11 segments. The central raised area of the cephalon (called glabella) consists from back to front of an occipital ring, but unlike in its close relative ''Phacops'' the preoccipital ring in ''Cho ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boeckops
''Boeckops'' is a genus of trilobites in the order Phacopida, which existed in what is now the Czech Republic. It was described by Chlupac in 1972, and the type species is ''Boeckops boecki'', which was originally described as ''Phacops boecki'' by Hawle and Corda in 1847. Boeckops is also been discriped from the lower Devonian of Morocco and Algeria. The Genus Boeckops is interpreted as intermediate from between the traditional genus concept of Phacops and Reedops. The Genus Boeckops is regarded as problematic or difficult by McKellar et Chatterton 2009.Ryan C McKellar, Brian DE Chatterton (2009) Early and Middle Devonian Phacopidae (Trilobita) of southern Morocco. Palaeontographica Canadiana 28: 1-110. References External links ''Boeckops''at the Paleobiology Database The Paleobiology Database (PBDB) is an online resource for information on the distribution and classification of fossil animals, plants, and microorganisms. History The Paleobiology Database originated in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Babinops
''Babinops'' is an extinct genus of trilobite in the family Phacopidae Phacopidae is a family (biology), family of Phacopida, phacopid trilobites that ranges from the Lower Ordovician to the Upper Devonian, with representatives in all Supercontinents, paleocontinents. Description As in all Phacopina, the eyes (if .... References Phacopidae Phacopida genera Articles created by Qbugbot {{Phacopida-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Denckmannites
''Denckmannites'' is a trilobite in the order Phacopida, that existed during the upper Silurian in what is now the Czech Republic. It was described by Wedekind in 1914, and the type species is ''Denckmannites volborthi'', which was originally described under the genus ''Phacops'' by Barrande in 1852. It also contains the species ''Denckmannites morator'', and ''Denckmannites primaevus''. The type locality was the Kopanina Formation. P.A. Jell and J.M. Adrain. References External links ''Denckmannites'' at the |
Acernaspis
''Acernaspis'' is an extinct genus of trilobite that is known from the Silurian The Silurian ( ) is a geologic period and system spanning 23.5 million years from the end of the Ordovician Period, at million years ago ( Mya), to the beginning of the Devonian Period, Mya. The Silurian is the third and shortest period of t .... It contains two species, ''A. elliptifrons'', and ''A. salmoensis''. It is sometimes found preserved in burrows of various forms, sometimes in association with multiple moults, suggesting that it used tunnels as refuges whilst in its vulnerable moulting stage. References Silurian trilobites of Europe Phacopidae Extinct animals of Europe Paleozoic life of Quebec Phacopida genera {{phacopida-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Burtonops
''Burtonops'' is a genus of trilobites in the order Phacopida. It was described by Struve in 1990. Species * ''Burtonops cristata'' (Hall, 1861) * ''Burtonops gaspensis'' (Clarke 1908) * ''Burtonops stummi'' (Eldredge 1973) * ''Burtonops variabilis'' (Eldredge 1973) * ''Burtonops nasutus'' (Stumm, 1954) References External links ''Burtonops'' at the Paleobiology Database
The Paleobiology Database (PBDB) is a ...
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Ananaspis
''Ananaspis'' is a genus of trilobite in the order Phacopida, which existed in what is now the Czech Republic. It was described by Campbell in 1967, and the type species is ''Ananaspis fecundis'', which was originally described as ''Phacops fecundus communis'' by Barrande in 1852. P.A. Jell and J.M. Adrain. References External links ''Ananaspis'' at the Paleobiology Database
The Paleobiology Database (PBDB) is an online resource fo ...
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Altaesajania
''Altaesajania'' is a genus of trilobites in the order Phacopida, which existed in what is now southern Siberia, Russia. It was described by Maksimova in 1978, and the type species is ''Altaesajania primitiva'', originally described as a species of '' Phacopidella'' by Maksimova in 1960. P.A. Jell and J.M. Adrain. References External links ''Altaesajania'' at the Paleobiology Database
The Paleobiology Database (PBDB) is an onlin ...
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