Animal Kingdom

Earthworms are classified in the phylum Annelida or Annelids. Earthworm is a reddish brown terrestrial invertebrate that inhabits the upper layer of the moist soil. They…

Class Mammalia is found in a variety of habitats – polarice caps, deserts, mountains, forests, grasslands and dark caves. Some of them have adapted to…

The characteristic features of class Aves (birds) are the presence of feathers and most of them can fly except flightless birds (e.g., Ostrich). They possess…

Class Reptilia name refers to their creeping or crawling mode of locomotion (Latin, repere or reptum, to creep or crawl). They are mostly terrestrial animals and…

Class Amphibia name indicates (Gr. Amphi : dual, bios, life), amphibians can live in aquatic as well as terrestrial habitats (Figure). Most of them have two…

Class Osteichthyes includes both marine and fresh water fishes with bony endoskeleton. Their body is streamlined. Mouth is mostly terminal (Figure). They have four pairs…

Class Chondrichthyes are marine animals with the streamlined body and have cartilaginous endoskeleton (Figure). Mouth is located ventrally. The notochord is persistent throughout life. Gill…

Cyclostomes are distinguished chiefly by the absence of certain customary fishlike structures. It is a group of agnathans that comprises the living jawless fishes: the…

Animals belonging to phylum Chordata are fundamentally characterized by the presence of a notochord, a dorsal hollow nerve cord and paired pharyngeal gill slits (Figure).…

Phylum Hemichordata was earlier considered as a sub-phylum under phylum Chordata. But now it is placed as a separate phylum under non-chordata. This phylum consists of…