Question

Deuterostomate and enterocoelomate invertebrate is
a. Pila
b. Ascaris
c. Aphrodite
d. Asterias

Answer 1

Hint: Enterocoelom is a coelom which arises from the outgrowths or pouches of walls of the gut (enteron) of embryos. The coelom arises in the embryonic stage in enterocoelomate and Deuterostomous development is the development of organisms where the anus is developed first rather than the mouth.

Complete answer:
Deuterostomia is known to be a sub-taxon of bilateria, which is branched under the Eumetazoa sub-kingdom, all which falls under the Animalia kingdom. Deuterostomes show deuterostomous embryonic development. The first opening (also known as blastopore) in deuterostomes forms the anus, whilst in protostomes the first opening forms the mouth. This differentiates deuterostomes from protostomes.

Deuterostomes can further be classified into 3 main biological groups:
Chordata: For e.g. Vertebrates
Echinodermata: For e.g.: Sea urchins and sea cucumbers
Hemichordata: For e.g.: Graptolites

Enterocoelomate can be described as any animal inside of which the body cavity lined by mesoderm ascends in embryonic state in form of an outward growth of the enteron. This type of growth can be observed in Echinodermata and some other invertebrate phyla, and also in Chordata. This is seen as proof of the mutual origin of Echinodermata as well as Chordata.
By all above mentioned details, we understand that Echinoderms only are both deuterostomate as well as ecterocoelomate.

Hence, the correct answer is option (D).

Note: Deuterostomes at times can also be identified as enterocoelomates. This is the reason that the coelom in the deuterostome develops through enterocoely. Enterocoely is a process that refers to both the processes- one through which embryo development takes place and the other through which cell origination occurs.