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05 Jul 2017
The sub-phylum Cephalochordata includes a single class Leptocardii, which has single family, Branchiostomidae. The family contains only two genera Branchiostoma and Asymmetron.   The subphylum - Cephalochordata includes Amphioxus or…
05 Jul 2017
Cephalochordata includes two genera, 1. Asymmetron and 2. Branchiostoma (Amphioxus). Cephalochordates are small fish like animals which show Chordate characters. The notochord extends the entire length of the body. They…
04 Jul 2017
Phylum Chordate is divided into three Sub-Phyla.   SUB-PHYLUM: UROCHORDATA SUB-PHYLUM: CEPHALOCHORDATA SUB-PHYLUM: VERTEBRATA   The first two sub phyla are called lower chordates or PROTOCHORDATES. They are usually called…
04 Jul 2017
CHORDATES   The Phylum Chordate includes bilaterally symmetrical, metamerically segmented, triploblastic, enterocoelomate metazoans exhibiting hights complex organization. This phylum is supposed to be one of the most heterogenous and diversified…
04 Jul 2017
The animal kingdom is divided into two sub-kingdoms:   Chordata Non-Chordata   GENERAL CHARACTRS OF CHORDATES   The Chordate characters appear in the developmental stage will persist in the adult…
04 Jul 2017
THEORIES ABOUT ORIGIN OF CHORDATES   It is believed that Chordates have originated from invertebrates. It is difficult to determine from which invertebrate group the chordates were developed. Chordate ancestors…
03 Jul 2017
In Eutherian mammals the embryo develops in the uterus of mother. The developing embryo will get nourishment from mother through the placenta. Placenta is not common to all mammals. It…
03 Jul 2017
There is an interrelation between the form of teeth arid nature of food. These may be omnivorous, carnivorous, insectivorous herbivorous and rodents or gnawing. In Mammals dentition is complete in…
02 Jul 2017
The tooth develops partly from the epidermis and partly from the mesenchyme of dermis. Its enamel is derived from the epidermis and the remaining parts from the mesenchyme. Mammalian teeth…
02 Jul 2017
Two main theories have been proposed to explain the evolution of molars.   CONCRESCENCE THEORY OF ROSE TRLTUBERCULAR THEORY OF COPE & OSBORN According to the concrescence theory, the molar…
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