Which type of force requires contact between two objects for one to push or pull on the other?
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Class Crustacea belongs to the Phylum Arthropoda. It is a class itself thus it does not have any subphylum.
<h2>_____________________________________ </h2>Phylums are the groups and Phylum arthropoda is one of the 33 phylas of the Kingdom Animalia. Phylum Arthropoda has the largest phylum of the Animal Kingdom with variety of animals that include one million species. It has 5 classes.
- Class Merostomata
- Class Arachnida
- Class Crustacea
- Class Myriapoda
- Class Insecta
- They are usually aquatic both marine and freshwater.
- Exoskeleton is hard and made up of chitin called carapace.
- Body is divisible into head, thorax and abdomen. Some animals have cephalothorax.
- Cephalothorax regions are formed by the fusion of head and thorax
- Head bears two pairs of antenna, one pair of mandible, two compound eyes with stalk.
- Respiration takes place by gills or through body surface
- Excretion is carried out by one pair of antennary glands or green glands.
- The thorax and abdomenal appendages may be modified for swimming, feeding, walking, resperation as well as reproduction.
- Sexes are separate
- Dimorphism is prominent
- Five walking legs for locomotion are present.
- Example: 1)free living are, Daphnia, Cyclops, Argulus, Sacculina, Prawn Crabs etc.
2)Parasite are, Barnacles and Sacculina.
3) Marine are Shrimps, Lobsters etc.
4) Sedentary crustaceans are Barnacle(Parasite), Prawns(Fresh-water living) etc.
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