Question
Biology Question on Kingdom Animalia
Among the following, which one is not a deuterostome?
A
Sea urchin
B
Earthworm
C
Sand dollar
D
Ichthyophis
Answer
Earthworm
Explanation
Solution
Earthworm is not a deuterostome. Deuterostomes are distinguished by their embryonic development. In these animals, the first opening (the blastospore) becomes the anus, while in protostomes it becomes the mouth. Deuterostomes are also known as enterocoelomates because their coelom develops through enterocoely. There are four extant phyla of Deuterostomes-Chordata, Echinodermata, Hemichordata and Xenoturbellida.