The phylum annelida is divided into polychaeta, oligochaeta and hirudinea. The polychaeta are also known as the multiple hair animals. They are marine with the fully formed parapodia and setae.…
The nereis is also known as clam worm or rag worm. They occur in the sea. They are unisexual and has a reproductive phase called as heteronereis. They fertilize in…
The pheretima posthuma is known as earth worm. It is found in the wet soil which is rich in organic matter. They belong to class oligochaeta. They are found in…
The hirudinaria is also known as cattle leech. It may occur as a free living or parasite. It is a free living in ponds, streams and rivers. It acts as…
The arthropoda are also known as the animals with jointed feet. Aristotle described it and Lamarck divided it into three classes such as crustacean, hexapoda and arachnida. Von Seibold proposed…
The phylum arthropoda is divided into different classes like crustacea, chilopoda, diplopoda, insecta and arachnida. The crustacea are divided into cephalo thorax and abdomen. Dorsally, it is covered by carapace…
The palaemon are also known as prawns. They reside in river and feed on algae, mosses and insects. Their main respiratory organs are gills. They have unisexual and bisexual forms…
The cancer is also known as rock crab. As the name suggests it occurs in rocks and sand. It is carnivorous and attacks its prey by legs. They show indirect…
The body of insect is divisible as head, thorax and abdomen. The head has eyes, antennae and mouth parts. The mouth parts are associated with the mouth. Thorax consists of…
Lepisma is also known as silver fish. It is a common domestic pest which occurs in dark, cool and damp areas. It moves swiftly and avoids being exposed to light.…
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