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Acastidae
Acastidae is a family of trilobites in the order Phacopida, suborder 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 Pal ..., superfamily Acastoidea, containing the following genera: References Acastoidea Trilobite families {{Phacopida-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gourdonia
''Gourdonia'' is a trilobite in the order Phacopida (family Acastidae), that existed during the middle Devonian in what is now France. It was described by Pillet in 1954, and the type species is ''Gourdonia gourdoni'', which was originally described under the genus ''Dalmanites'' by Barrois in 1883. The generic name is derived from the species epithet. The type locality was the Cathervielle Shale in the Pyrenees mountains. P.A. Jell and J.M. Adrain. References External links ''Gourdonia'' at the |
Erbenochile
''Erbenochile'' is a genus of spinose phacopid trilobite, of the family Acastidae, found in Lower to Middle Devonian age rocks from Algeria and Morocco. Originally described from an isolated pygidium (the posterior body part or shield), the first complete articulated specimen of ''E. erbeni'' revealed the presence of extraordinarily tall eyes: Number of lenses has been estimated at 560 or 450 incomplete preservation accounting for the uncertainty. A lens count of 18 lenses per file is unusually high (twice that of closely related genus) and accounts for the height of the eye, as opposed to a noticeable increase in the size of the individual lenses. A recently found species (''E. issoumourensis'') has smaller eyes, with fewer files (33–35) and fewer lenses per file (13–14 max) than ''E. erbeni''. ''E. erbeni'' eyes allow full 360 degree coverage in the horizontal plane and were high enough to allow the trilobite to see backwards over its thorax. The presence of eye sha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Feruminops
''Feruminops'' is a trilobite in the order Phacopida, that existed during the lower Devonian in what is now Turkey. It was described by Haas in 1968, and the type species is ''Feruminops crepida''. The type locality was the Dede Formation. P.A. Jell and J.M. Adrain. References External links ''Feruminops'' at the Paleobiology Database
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Cryphina
''Cryphina'' is a trilobite in the order Phacopida, that existed during the lower Devonian in what is now France. It was described by D. Oehlert in 1889, and the type species is ''Cryphina andegavensis''. It was described from Saint-Barthélemy-d'Anjou near Angers, Anjou. P.A. Jell and J.M. Adrain. References External links ''Cryphina'' at the Paleobiology Database
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Comura
''Comura'' is a trilobite in the order Phacopida that existed during the lower Devonian in what is now Eifel, Germany. It was described by Richter and Richter in 1926, and the type species is ''Comura cometa'', originally under the genus '' Cryphaeus'' by Richter in 1909. P.A. Jell and J.M. Adrain. References External links ''Comura'' at the Paleobiology Database
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Coltraneia
''Coltraneia'' is a genus of trilobite, that lived during the upper Emsian and lower Eifelian, and has been found in Algeria, France, Germany, Morocco and Spain. Description The frontal lobe of the central raised area of the headshield (or glabella) is rounded. The furrow defining the glabella is curved behind the frontal lobe. Both lobes directly behind the frontal lobe (L3 and L2) are more elevated than the lobe (L1) just in front of the occipital ring (L0). All sighted phacopina have schizochroal eyes, but in ''Coltraneia'' these are particularly large with 13–14 lenses in each of the vertical rows (or dorsoventral file) at midlength. The front of these eyes almost touches the furrow separating the frontal from the following lobe, while the back of the eyes touch the posterior border furrow. The axis of the tailshield (or pygidium) has 13 to 15 rings, and is constricted between the 6th and 7th rings. In the pleural region to the side of the pygidial axis, 8–11 segments c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Echinopyge
''Echinopyge'' is a trilobite in the order Phacopida, that existed during the lower Devonian in what is now Turkey. It was described by Haas in 1968, and the type species is ''Echinopyge cathamma''. The type locality was the Kurtdogmus Formation. P.A. Jell and J.M. Adrain. References External links ''Echinopyge'' at the Paleobiology Database
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Centauropyge
''Centauropyge'' is a trilobite in the order Phacopida that existed during the lower Devonian in what is now Turkey. It was described by Haas in 1968, and the type species is ''Centauropyge pronomaea''. It was described from the Gebze Formation. P.A. Jell and J.M. Adrain. References External links ''Centauropyge'' at the Paleobiology Database
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Breizhops
''Breizhops'' is a genus of trilobite in the order Phacopida, which existed in what is now Brittany, France. It was described by Morzadec in 1983, and the type species is ''Breizhops lanceolatus''. P.A. Jell and J.M. Adrain. References External links ''Breizhops'' at the Paleobiology Database
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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 tw ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Asteropyge
''Asteropyge'' is an extinct genus of trilobite Trilobites (; meaning "three lobes") are extinct marine arthropods that form the class Trilobita. Trilobites form one of the earliest-known groups of arthropods. The first appearance of trilobites in the fossil record defines the base of the At .... It lived from the end of the Lower Devonian (upper Emsian) into the Middle Devonian (lower and upper Eifelian), in what are today France (Armorican Massif), and Germany (Eifel area). References Acastidae Devonian trilobites of Europe Fossils of France Fossils of Germany Early Devonian first appearances Eifelian extinctions {{phacopida-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acastopyge
''Acastopyge'' is a genus of trilobite in the order Phacopida, which existed in what is now Poland. It was named by E. Tomczykowa in 1974, and the type species is ''Acastopyge shergoldi''. P.A. Jell and J.M. Adrain. References External links ''Acastopyge'' at the Paleobiology Database
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