Fig -Reptilia These animals are cold-blooded, have scales and breathe through lungs. While most of them have a three-chambered heart, crocodiles have four heart chambers. They lay eggs with tough coverings and do not need to lay their eggs in water, unlike amphibians. Snakes, turtles, lizards and crocodiles fall in this category
These animals differ from the fish in the lack of scales, in having mucus glands in the skin, and a three-chambered heart. Respiration is through either gills or lungs. They lay eggs.These animals are found both in water and on land. Frogs, toads and salamanders are some examples
Scoliodon (Dog fish) ( A) Pisces These are fish. They are exclusively aquatic animals. Their skin is covered with scales/ plates. They obtain oxygen dissolved in water by using gills. The body is streamlined, and a muscular tail is used for movement. They are cold-blooded and their hearts have only two chambers, unlike the four …
Cyclostomes are jawless vertebrates. They are characterised by having an elongated eel-like body, circular mouth, slimy skin and are scaleless. They are ectoparasites or borers of other vertebrates. Petromyzon (Lamprey) and Myxine (Hagfish) are examples.
These animals have a true vertebral column and internal skeleton, allowing a completely different distribution of muscle attachmentpoints to be used for movement.Vertebrates are bilaterally symmetrical, triploblastic, coelomic and segmented, with complex differentiation of body tissues and organs. All chordates possess the following features:(i) have a notochord(ii) have a dorsal nerve cord(iii) are triploblastic(iv) have …
These animals are bilaterally symmetrical, triploblastic and have a coelom. In addition, they show a new feature of body design, namely a notochord, at least at some stages during their lives. The notochord is a long rod-like support structure (chord=string) that runs along the back of the animal separating the nervous tissue from the gut. …
In Greek, echinos means hedgehog (spiny mammal), and derma means skin. Thus, these are spiny skinned organisms. These are exclusively free-living marine animals. They are triploblastic and have a coelomic cavity.They also have a peculiar water-driven tube system that they use for moving around. They have hard calcium carbonate structures thatthey use as a skeleton. …
In the animals of this group, there is bilateral symmetry. The coelomic cavity is reduced.There is little segmentation. They have an open circulatory system and kidney-like organs for excretion. There is a foot that is used for moving around. Examples are snails and mussels
This is probably the largest group of animals. These animals are bilaterally symmetrical and segmented. There is an open circulatorysystem, and so the blood does not flow in well defined blood vessels. The coelomic cavity is blood-filled. They have jointed legs (the word‘arthropod’ means ‘jointed legs’). Some familiar examples are prawns, butterflies, houseflies, spiders, scorpions …
Annelid animals are also bilaterally symmetrical and triploblastic, but in addition they have a true body cavity. This allows true organs to be packaged in the body structure. There is, thus, extensive organ differentiation.This differentiation occurs in a segmental fashion, with the segments lined up one after the other from head to tail. These animals …
