IS SPIDER AN INSECT? NORMALLY INSECTS HAVE SIX LEGS,BUT SPIDER HAS EIGHT. R.SRINIDHI,III CBSE.
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Spiders and insects are not closely related. The distance between arachnids and insects is pretty far. The estimate from timetree.org says that spiders and ants last shared a common ancestor 581 million years ago. Unlike insects, spiders do not have antennae.
The number of segments bearing limbs is different in spiders and insects, hence the different number of legs.
Spiders belong to a large group of animals called the Chelicerata. They are named for the snappers on their heads, their chelicera. Some chelicera snap up and down, and some snap sideways. The other thing that animals in the Chelicerata group have in common is four pairs of legs. The Arachnids (spiders, scorpions, mites and ticks) all of which are Chelicerates.
The development of four pairs of legs took place over millions and millions of years.
So, for some random genetic reason, some ancient relative of the spider developed eight legs.
The number of segments bearing limbs is different in spiders and insects, hence the different number of legs.
Spiders belong to a large group of animals called the Chelicerata. They are named for the snappers on their heads, their chelicera. Some chelicera snap up and down, and some snap sideways. The other thing that animals in the Chelicerata group have in common is four pairs of legs. The Arachnids (spiders, scorpions, mites and ticks) all of which are Chelicerates.
The development of four pairs of legs took place over millions and millions of years.
So, for some random genetic reason, some ancient relative of the spider developed eight legs.
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