Which of the following animal shown here is Not an arthropod?
Features of Arthropoda
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Choices
Choice (4)
a.
A
b.
B
c.
D
d.
C
Answer
b.
Explanation
Features of Arthropoda
It is the largest phylum of the animal kingdom, covering about 80 % of the animals
Aquatic, terrestrial or aerial (only non-chordates which can be aerial).
Exoskeleton of Chitin- a polysaccharide of N-acetylglucosamine.
Periodic removal of exoskeleton called Ecdysis or moulting- essential for growth.
Meteorically segmented.
Blood vascular system Open type (Capillaries –nt, Haemocoel + nt). Blood pigment present or absent (insects). If present it is Hemocyanin (having Cu instead of Fe).
Respiratory structures- Gills, Book lungs and Tracheal tubes.
Excretory structures- Green glands (Antennal glands), Coxal glands and Malpighian tubules.
Nervous system very well developed. Eyes simple or Compound.
Unisexual (Dioecious) with well-marked sexual dimorphism. Fertilization internal.
Development mostly indirect.
Examples: - Palamon (Prawn) - Nauplius and Met nauplius larva, Astacus (Cray fish) - Larva
absent, Cancer (Crab) - Zoea and Megalopa larva, Eupagarus (Hermit crab), Squilla - Alima larva, Sacculina (parasite on crab) - Nauplius, Kentrogen and Cypris larva, Cyclops (Secondary host for Guinea worm) - Nauplius larva, Daphnia (Water flea), Shrimp, Woodlice Butterfly, housefly, honey bee, wasp, louse, termite, moth, mosquito, dragon fly, Bed bug, Flea, Cicada, Silver fish (Lepisma) and Chironomus fly etc.
