It includes verities group ectothermic vertebrates including lizards, snakes, crocodiles, alligators, turtles, caimans and worm-lizards, etc. These hibernating animals are very difficult to awaken. Phylogenetic classification of Life, with emphasis on Phylum Chordata. The skin of mammals is unique which possesses hair and oil glands such as sebaceous glands and sweat glands. They have a brain which is enclosed in a skull. Examples: Scoliodon (Dog fish), Pristis (Saw fish), Carchaiodon (Great white shark), Trygon (Sting ray). 1 Year Validity == Validity of the Download links (both Static & Current Affairs) is 1 Year from the date of purchase. Absence of conus arteriosus and renal portal system. Gill slits are separate and without operculum (gill cover). Urochordata . They are hermaphrodite (sexes are united). There are approximately 8,100 species, of which, about 90% are frogs. It connects the brain to the muscles and other organs. Endoskeleton is composed of either bones or cartilages. They have internal fertilisation and many of them are. Example Phylum: Chordata. Animals like elephants use their ears to cool their body [large, thin ears which loose heat quickly]. General Characteristics of phylum Protozoa. Examples : Crow, Pigeon, Ostrich), Neophron (Vulture) etc.. They commonly exhibit viviparity. They require a lot of food for their survival. Heterocercal type caudal fin is found in the primitive species but diphycercal type caudal fin is present in the recent forms. Two large and numerous small gill-slits are present. No conjugation. It is situated immediately above the alimentary canal (digestive tract) and just below the dorsal tubular nerve cord. Examples: Urochordata – Ascidia, Salpa, Doliolum; Cephalochordata – Amphioxus or Lancelet. Annelids are metamerically segmented animals with a true coelom. Skeleton is wholly cartilaginous; vertebrae incipient as sticks. The chordates are bilaterally sym­metrical, triploblastic, coelomate animals. They have a well-developed brain and a central nervous system with twelve pairs of cranial nerves. Phylum Chordata Chordates have bilaterally symmetric bodies that are longitudinally differentiated into a head, trunk and tail. Respiration is by gills, lungs and through skin. Subphylum UROCHORDATA, Herdmania, Salpa, Doliolum, Pyrosoma, Oikopleura sedentary or planktonic tunicates in which chordate characters manifest in the larval stage. Sexes are separate; fertilization is internal with direct development. They are mostly oviparous, but viviparity is seen in some snakes, some of which are ovo-viviparous. Once the payment is made, you need to log in to the Downloads Page to download the files (check your email for the login details). They have a cylindrical body with proboscis, collar and trunk. Exoskeleton of cu­ticle, jointed ap­pendages. Their body is very light with pneumatic bones. Chordate characteristics disappear in the adult but it persists in the larval stage. Constantly changing body temperatures make life more difficult for the parasites. Cold-blooded animals often like to bask in the sun to warm up and increase their metabolism. Species Ciona intestinalis. Locomotary organ: Mostly free living, some are parasitic; Reproduction: asexually by binary fission and sexually by syngamy. The body does not contain any scales. The remaining chordates are the tunicates (Urochordata), lancelets (Cephalochordata), and, possibly, some odd extinct groups. Subphylum UROCHORDATA, Herdmania, Salpa, Doliolum, Pyrosoma, … amzn_assoc_asins = "B00DQZ64YC,B004WYX4AS,B000A38F3Q,B000A2KAXU,B002C014JW,B0000ANHSZ,B002R0F9LG,B0012M2O90,B007HJFVNI"; The larval stage and through skin Ostrich ), Neophron ( Vulture ) etc are separate ; fertilization internal... 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