Kingdom Animalia - Division Vertebrata (Craniata) | 9th Science : Living World of Animals - Diversity in Living Organism - Kingdom Animalia
Chapter: 9th Science : Living World of Animals - Diversity in Living Organism - Kingdom Animalia
Division Vertebrata (Craniata)
Division Vertebrata (Craniata)
This group is characterized by the presence of brain case or cranium and vertebral column. The notochord is an embryonic structure gets replaced by a vertebral column which forms the chief skeletal axis of the body. They have ventral muscular heart with two, three or
four chambers. The locomotor organs
may be ns or limbs. Excretion and osmoregulation are carried out by a pair of
kidneys. They exhibit sexual dimorphism.
1. Super Class: Pisces (Fishes)
Fishes are poikilothermic,
aquatic vertebrates with jaws. The body is streamlined. It is differentiated
into head, trunk and tail. Locomotion is by paired and median ns. The
body has a covering of scales. Body
muscles are arranged into segments called myotomes.
Respiration is performed by gills. Gill slits are 5-7 pairs. They are
covered by an operculum. The heart
is two chambered with an auricle and
a ventricle. Lateral line sense organs are well developed.
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