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Paciphacops Campbelli
''Paciphacops'' is a genus of trilobites within order Phacopida, suborder Phacopina. This genus is found primarily in the United States and Australia and is easily mistaken for the genera ''Phacops'' and ''Kainops'', which are also popular among collectors. One major difference between ''Paciphacops'' and ''Phacops'' is that the central raised area (or Trilobite#Cephalon, glabella) of the headshield (or cephalon (arthropod anatomy), cephalon) extends beyond the headshield's anterior margin. A major difference between ''Paciphacops'' and ''Kainops'' is the greater number of eye facets in ''Kainops''. The skin (or sclera) of the visual surface in ''Paciphacops'' is thickened and bulged compared to the edge of each lens. Species A subset of the currently valid species of ''Paciphacops'' is below. The geographic region designated below for each species does not necessarily represent the entire geographic range for each species. *''Paciphacops birdsongensis'', Tennessee. *''Paciphaco ... [...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] |
Phacops
''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 (" volvation"), a biological defense mechanism th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kainops
''Kainops'' is a genus of trilobites from the family Phacopidae, order Phacopida. It can be distinguished from ''Paciphacops'' by the greater number of facets to the eye (6–8 per row, compared to 3–4 in ''Paciphacops''). The form of the furrow between the palpebral area and the palpebral lobe also distinguishes ''Kainops'' from the genera ''Paciphacops'' and ''Viaphacops''. Species included in the genus are: *''Kainops chlupaci'' Budil & Kolář, 2004 *''Kainops ekphymus'' (Jones ''et al.'', 1986) *''Kainops guttulus'' (Campbell 1967) *''Kainops invius'' (Campbell 1977) *''Kainops microps'' (Chatterton, Johnson and Campbell, 1979) *''Kainops raymondi'' (Delo 1935) *''Kainops veles'' (Chlupac 1972) References Phacopidae Extinct animals of North America Devonian trilobites Phacopida genera Fossil taxa described in 1991 {{trilobite-stub ... [...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] |
Cephalon (arthropod Anatomy)
The cephalon is the head section of an arthropod. It is a tagma, i.e., a specialized grouping of arthropod segments. The word cephalon derives from the Greek κεφαλή (kephalē), meaning "head". Insects In insects, ''head'' is a preferred term. The insect head consists of five segments, including three (the labial, maxillary and mandibular) necessary for food uptake, which are altogether known as the gnathocephalon and house the suboesophageal ganglion of the brain, as well as the antennal segment, and an ocular segment, as well as a non segmented fused section of the head where the archicerebrum is housed known as the acron. See also arthropod head problem. Chelicerates and crustaceans File:Cherax warsamsonicus - ZooKeys 660 151-167 (cropped).jpg, The crustacean '' Cherax warsamsonicus'' File:Phrynus asperatipes.jpg, The amplypygid chelicerate '' Phrynus asperatipes'' In chelicerates and crustaceans, the cephalothorax is derived from the fusion of the cephalo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paciphacops Birdsongensis
''Paciphacops'' is a genus of trilobites within order Phacopida, suborder Phacopina. This genus is found primarily in the United States and Australia and is easily mistaken for the genera ''Phacops'' and ''Kainops'', which are also popular among collectors. One major difference between ''Paciphacops'' and ''Phacops'' is that the central raised area (or glabella) of the headshield (or cephalon) extends beyond the headshield's anterior margin. A major difference between ''Paciphacops'' and ''Kainops'' is the greater number of eye facets in ''Kainops''. The skin (or sclera) of the visual surface in ''Paciphacops'' is thickened and bulged compared to the edge of each lens. Species A subset of the currently valid species of ''Paciphacops'' is below. The geographic region designated below for each species does not necessarily represent the entire geographic range for each species. *'' Paciphacops birdsongensis'', Tennessee. *''Paciphacops campbelli ''Paciphacops'' is a genus of tri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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] |
