Class Arachnida belongs to the phylum Arthropoda, one of the most diverse and successful groups of animals on Earth. Arachnids include spiders, scorpions, ticks, mites, and related species. Here’s the systematic classification of Class Arachnida, from the broader to the more specific taxonomic levels:
Systematic Classification of Arachnida
1: Eukarya
– All arachnids are eukaryotic organisms, meaning their cells have a nucleus and other membrane-bound organelles.
2. Kingdom: Animalia
– Arachnids belong to the animal kingdom, which includes all multicellular organisms that are heterotrophic (obtain their food from external sources).
3. Phylum: Arthropoda
Key Characteristics: Segmented bodies, exoskeleton made of chitin, jointed appendages.
• Arthropoda is the largest phylum in the animal kingdom and includes insects, crustaceans, and myriapods, along with arachnids.
4. Subphylum: Chelicerata
• Key Characteristics: Presence of chelicerae (mouthparts used for feeding), lack of antennae, and a body divided into two main parts (cephalothorax and abdomen).
• Chelicerata also includes other classes like Merostomata (horseshoe crabs) and Pycnogonida (sea spiders).
• 5. Class: Arachnida
• Key Characteristics: Four pairs of legs (eight legs in total), two main body segments (cephalothorax and abdomen), no antennae or wings, and specialized mouthparts (chelicerae and pedipalps).
• Members of Arachnida are primarily terrestrial and include a wide variety of predatory species.
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