|3rd California Islands Symposium||They are found in habitats ranging from shallow intertidal areas to abyssal depths|
|, p||8 3 : 341—351|
Their locomotor function came later, after the re-orientation of the mouth when the podia were in contact with the substrate for the first time.27
|marks the opening of the "second mouth" that places echinoderms within the deuterostomes, and the mesoderm, which will host the skeleton, migrates inwards||American Zoologist|
|Tree of Life||, pp|
Asexual reproduction by transverse has also been observed in adult sea cucumbers.