Protoreaser nodosus
Starfish are marine invertebrates. They usually have a central disc and five arms, though some species have a larger number of arms. The upper surface may be smooth, granular or spiny, and is covered with overlapping plates.
Starfish usually reproduce by free-spawning, which is the releasing of their gametes into the water where they should be fertilized by gametes from the opposite sex. To increase their chances of insemination, starfish gather in groups when they are ready to produce. They use environment signals to coordinate timing and use certain chemicals to indicate their readiness. Fertalized eggs grow into bipnnaria and later into larvae, which grow by catching and eating plankton. Starfish can also reproduce in a process called fission or autonomy. In fission, the central disc splits apart and the missing parts and limbs of each piece grow back onto them. In autotomy, one arm of a starfish breaks of and lives independently on its own, eventually developing into a new starfish.
Starfish are marine invertebrates. They usually have a central disc and five arms, though some species have a larger number of arms. The upper surface may be smooth, granular or spiny, and is covered with overlapping plates.
Starfish usually reproduce by free-spawning, which is the releasing of their gametes into the water where they should be fertilized by gametes from the opposite sex. To increase their chances of insemination, starfish gather in groups when they are ready to produce. They use environment signals to coordinate timing and use certain chemicals to indicate their readiness. Fertalized eggs grow into bipnnaria and later into larvae, which grow by catching and eating plankton. Starfish can also reproduce in a process called fission or autonomy. In fission, the central disc splits apart and the missing parts and limbs of each piece grow back onto them. In autotomy, one arm of a starfish breaks of and lives independently on its own, eventually developing into a new starfish.