Question

A member of cephalochordate is
A. Herdmania
B. Ciona
C. Amphioxus
D. Balanoglossus

Answer 1

Hint:Herdmania is an animal that is in the Urochordata subphylum. Balanoglossus is an animal of the Hemichordata phylum.

Complete answer:
In the subphylum cephalochordata, cephalochordate is an animal. Chordates for all five synapomorphies, the features of all chordates in the larval or adult phases. These include: dorsal hollow nerve, post-anal tail, endostyle, notochord and pharynx. These are synapomorphies.
Herdmania is an animal that is in the Urochordata subphylum. The body has a flat, 6 -13 cm long bag like structure. 4 -7 cm in width. Brownish is the colour. The animal is beautifully buried by foot in sand. The body itself has two atrial and branch syphons projection.
Ciona is classified in the Urochordata subphylum. Ciona 's body is bag-like and is wrapped in a tunic, an epidermal cell secretion. The body has two apertures on its back, buccal and atrial siphons. The body is fixed on the back end of a permanent foundation.
Amphioxus is found in the Cephalochordata subphylum. They are small sea creatures, which are usually found in temperate waters in coastal waters.
Balanoglossus is an animal of the Hemichordata phylum. It's an exclusively marine and burrowing creature. It is found between the waves along the coast of warm and temperate oceans in shallow waters.

Thus, the correct answer is option C. i.e., Amphioxus.

Note:Chordates for all five synapomorphies, the features of all chordates in the larval or adult phases. These include: dorsal hollow nerve, post-anal tail, endostyle, notochord and pharynx.