In particular, many bivalves and echinoids evolved into effective burrowers, probably in response to the evolution of more effective nektonic predators such as the ammonoids and fish. Became minor invertebrate phylum. Most modern corals are of this type. New adaptations included - reduction and rounding of scales, increased ossification of skeleton, development of a hydrostatic swim bladder. Plants During the Triassic and Jurassic, the primary floras consist of seedless vascular plants.
Seed ferns become extinct at the end of the Triassic.
Flowering Plants Angiosperms are the most succesful group of plants on Earth. Pollination - Gymnosperms rely on wind to disperse pollen to one another for fertilization. This is done by attracting bees to plant with flower. As bees feed on nectar, they distribute pollen from plant to plant - a much more efficient and less random process than wind dispersal. This extra food may allow angiosperm seedlings to grow faster, and out compete gymnosperm seedlings.