Tag Archives: Deuterostomes.
Protostomes and Deuterostomes
An embryo is defined as any organism in a stage before birth or hatching, or in plants, before germination occurs. After cleavage, the dividing cells, or morula, becomes a hollow ball, or blastula, which develops a hole or pore at one end. All triploblastic animals (Three germ layers / all Bilaterians animals ) can be… Read More »
Animals with skulls – Craniata
In one of previous post “Biological classification of animals” dealing the classification of all the animals on our planet Earth we have seen that animals with three germ layers (triploblastic animals) can be divided in protostomes and Deuterostomes based on the fate of first opening of the development. Further we have seen that Deuterostomes can… Read More »
Classification of Animals
What is the need to classify organisms present around us??? “There are an estimated 1.5 – 1.7 million named species on earth (E. O. Wilson, 2001). Of these, invertebrates account for >99%. In reality there may be 13 620 000 species (or more) in total according to the Global Biodiversity Assessment”. 1) To give specific… Read More »