Silurian and Devonian Key Words

Silurian and Devonian Key Words - Key Terms Definition...

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Key Terms Definition Key Points Agnatha One of the types of Jawless fish Include hagfish and lamprey Lamprey have no jaw The migrated to the great lakes They are living relatives Cartilaginous body Alternation of generations The regular alternation of mode of reproduction in the life cycle of an organism, such as the alternation between diploid (sporophye) and haploid (gametophyte) phases in plants Antheridia In plants, a structure in which sperm are producted Sperm Archegonia The flask-shaped structure in which bryophyte eggs form Arch EG onia - EGG Arthropoda Largest crustaceans They appeared do to the large loss in trilobytes, which WERE top predators Crustacea take over trilobyte niche Bony fish Fish with a skeletal system made out of bone Fins articulate with the body Have bones in fins Move manoeuvrable then cartilaginous fish Cartilaginous fish Fish which have a skeletal system made out of cartilage rather than bone Their fins are densely attached to body which gives poor manoeuvrability Rocketed shaped body in sharks gives extreme stability Have oil in swim bladders which is less dense then the water which helps keep them buoyant Chondricthyes Cartilaginous fish Includes sharks, rays etc.
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Crustacean Devonian period Occurred after the Silurian Period Explosion for land plants (not flowering plants)
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Silurian and Devonian Key Words - Key Terms Definition...

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