$Herdmania$ belongs to which subphylum?

Select the incorrect option for vertebrates:

Echinoderms and chordates have

Which of the following statements is/are correct for the phylum Chordata?
$(a)$ In Cephalochordata,the notochord extends from head to tail region and is persistent throughout their life.
$(b)$ In Vertebrata,the notochord is present only during the embryonic period.
$(c)$ The central nervous system is dorsal and hollow.
$(d)$ Chordata is divided into $3$ subphyla: Hemichordata,Urochordata,and Cephalochordata.

Usually,chordates have red blood containing red blood corpuscles. The blood is red due to the presence of the following pigment:

Which of the following is not a characteristic of chordates?