What's the difference between devonian and placoderm?
Devonian
Definition:
(a.) Of or pertaining to Devon or Devonshire in England; as, the Devonian rocks, period, or system.
(n.) The Devonian age or formation.
Example Sentences:
(1) Modern lungfish are air-breathing nonmarine forms, yet their Devonian forebears were marine fish that did not breathe air.
(2) The Siluro-Devonian "explosive" colonization of land, and indeed the very evolution of plants, was possible only through such mutualistic partnerships-partnerships that were equipped to cope with the problems of desiccation and starvation associated with terrestrial existence.
(3) The diversity of tetrapods increased from the Devonian to the Permian, remained roughly constant during the Mesozoic, and then began to increase in the late Cretaceous, and continued to do so during the Tertiary.
(4) Sharks are living fossils that are indistinguishable morphologically from their Devonian ancestors of approximately equal to 400 million years ago.
(5) Photograph: University Museum of Zoology Cambridge “It does appear that if there had been a ‘gap’ it was much smaller than previously thought, and might have affected some groups less severely than others,” Clack told me, talking about the disappearance of many species at the end of the Devonian.
(6) This period marks the end of the Devonian, often referred to as the “age of fish”, and the beginning of the Carboniferous.
(7) – Cambrian, Ordovician, Silurian, Devonian, Carboniferous, Permian, Triassic, Jurassic, Cretaceous … 'What will survive of us is love', wrote Philip Larkin.
(8) The dental plates of the Devonian lungfish Chirodipterus australis Miles (Osteichthyes; Dipnoi) are shown to have achieved their characteristic morphology by a growth process different from that assumed for the plates of genera such as Dipterus.
(9) Recent work on Silurian, Devonian and Carboniferous terrestrial assemblages has provided plausible evidence for all major groups of extant fungi in the Paleozoic.
(10) Fossils dating from the time of origin of tetrapods in the Devonian offer the only hope of understanding the morphological innovations that led to tetrapods; morphological analysis of the "living fossils," the coelacanth and lungfish, only lends confusion.
(11) Here I report the discovery of the stapes of Acanthostega gunnari, from the Upper Devonian of east Greenland.
(12) Late Devonian, c 360 million years ago A messy prolonged climate change event, again hitting life in shallow seas very hard, killing 70% of species including almost all corals.
(13) Evolution of life coincides with the most rapid rate of rise in atmospheric oxygen concentration during Devonian time.
(14) Morphologically, sharks are living fossils that are remarkably similar to their Devonian ancestors of ca.
(15) These, together with the marginal teeth and ridges, have been interpreted as primitive characters of the dipnoan dentition shared with three other genera: the Devonian Uranlophus and Griphognathus and the Carboniferous to Permian Conchopoma.
(16) Devonian vertebrates include a wide range of endemic forms, which provide evidence of more than six distinct biostratigraphic assemblages in South China and five biogeographical realms.
(17) The 51-year-old Devonian mother of two was being wooed by Harold Tillman, the retail magnate who had recently bought the historic British Jaeger clothing brand, over a series of high teas at Claridge's.
(18) Further comparison of the results with similar experimental findings in members of other vertebrate classes supports the notion that several of these same pathways can be traced to even more remote ancestry, with some possibly as old as the entire vertebrate subphylum--dating from the early Devonian or before, perhaps 430 million years ago.
(19) The spatial arrangement of the vertical canals is already present in fossil ostracoderms, and is also exemplified in lampreys, the modern forms of once abundant agnathan species that populated the Silurian and Devonian oceans.
(20) A review of the vertebrates within the Silurian and Devonian of China suggests a more detailed picture of palaeobiogeographical distribution than previously possible.
Placoderm
Definition:
(n.) One of the Placodermi.
Example Sentences:
(1) These data support the concept that variable and J region sequence have been conserved in the evolution of placoderm-derived vertebrates, but that constant regions show much greater phylogenetic variation.
(2) Of over 60 agnathan and fish genera known, only 5 placoderms (Givetian-Famennian) are cosmopolitan.
(3) The only detectable DNP-binding protein in the serum of placoderm-derived vertebrates was immunoglobulin in nature, and of the order of less than or equal to 1% total serum immunoglobulin.
(4) Molecular genetic studies of placoderm derived vertebrates are incomplete but are sufficient to allow the conclusion that Igs of these species are specified by variable (V), joining (J) and constant (C) gene segments and that rearrangement are an essential feature for the generation of antibody diversity.