chordate animals
41Burgess shale type fauna — A number of assemblages bear fossil assemblages similar in character to that of the Burgess shale. While many are also preserved in a similar fashion to the Burgess shale, the term Burgess shale type fauna covers assemblages based on taxonomic… …
42Conodont — Conodonts Temporal range: 495–199.6 Ma …
43Nectocaris — pteryx Temporal range: Middle Cambrian, 505 Ma …
44fish — 1) any chordate below the tetrapods. A poikilothermic aquatic chordate breathing by means of gills throughout life (accessory organs may be used) and having limbs, if any, in the form of fins. For convenience, lancelets, lampreys and hagfishes… …
45hemichordate — /hem i kawr dayt/, Zool. adj. 1. belonging or pertaining to the chordates of the phylum Hemichordata, comprising small, widely distributed, marine animals, as the acorn worms. n. 2. a hemichordate animal, having a vertebratelike hollow nerve cord …
46Walter Garstang — (February 9, 1868 February 23, 1949), a Fellow of Lincoln College, Oxford, was a marine biologist and zoologist who was one of the first to study the functional biology of marine invertebrate larvae. His best known works on marine larvae were his …
47Cephalochordata — A Branchiostoma lanceolatum lancelet Scientific classification Kingdom: Anima …
48evolution — evolutional, adj. evolutionally, adv. /ev euh looh sheuhn/ or, esp. Brit., /ee veuh /, n. 1. any process of formation or growth; development: the evolution of a language; the evolution of the airplane. 2. a product of such development; something… …
49biosphere — biospheric /buy euh sfer ik/, adj. /buy euh sfear /, n. 1. the part of the earth s crust, waters, and atmosphere that supports life. 2. the ecosystem comprising the entire earth and the living organisms that inhabit it. [1895 1900; < G Biosphäre; …
50Evolutionary history of life — Although evidence of early life is scarce and often difficult to interpret, it appears that life appeared on Earth relatively soon (on the geologic time scale) after the planet had cooled enough for liquid water to be present. The dominant theory …
