characteristics of Class Arachnida.
Answers
Arachnids are classified in the Phylum Arthropoda, which also consists of crustaceans, insects, centipedes, and millipedes. This phylum is defined by the following key characteristics:
1) Body segmentation - usually consisting of a head, thorax, and abdomen
Jointed appendages.
2) A firm but flexible exoskeleton.
3) An open circulatory system - blood is free-flowing in the body, not contained in vessels.
4) Specialized appendages - including claws (crustaceans) or wings (insects).
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Answer:
Many people have a strong fear of spiders. Perhaps yourself included! Spiders are just one type of animal found in the category of arachnids, a class of invertebrates including spiders, ticks, mites, and scorpions. Though it can often be easy to confuse arachnids with insects, who do belong in the same phylum, they are not themselves insects and belong to a different class. The different classes within the same phylum are kind of like cousins to each other. Arachnids are very commonly seen in the fossil record and have had great evolutionary success during Earth's history, namely due to their unique survival characteristics. As of now, there are over 100,000 known species of arachnids!