Multiple Choice
Ambulacrarians and chordates are united into the clade Deuterostomia.In addition to sharing deuterostome characters like radial cleavage and an anus that forms in the region of the embryonic blastopore,the validity of the clade is supported by a wealth of molecular evidence.Another synapomorphy was once considered to be uniquely chordate,but now it is thought to have evolved very early in the deuterostome lineage and then lost in the echinoderm branch.This character is
A) a dorsal tubular nervous system.
B) larvae with ciliary bands.
C) a buccal diverticulum.
D) pharyngeal slits.
Correct Answer:
Verified
Correct Answer:
Verified
Q34: The ciliated larva of an acorn worm
Q35: The characteristic larva of the echinoids is
Q36: Members of the echinoderm class _ are
Q37: Modern adult echinoderms have a form of
Q38: The _ serves as an inlet into
Q40: Of the following structures found in sea
Q41: The anterior region of the digestive tract
Q42: The echinoderms and hemichordates are<br>A)asymmetrical.<br>B)diploblastic.<br>C)deuterostomes.<br>D)ecdysozoans.<br>E)lophotrochozoans.
Q43: Nutritionally,pterobranchs are<br>A)filter feeders.<br>B)parasitic.<br>C)mutualistic.<br>D)commensalists<br>E)predators.
Q44: Acorn worms belong to the class<br>A)Ascidacea.<br>B)Concentricycloidea.<br>C)Pterobranchia.<br>D)Enteropneusta.<br>E)Thaliacea.