Page 23 - SAAT BIOLOGY PART 1

SAAT BIOLOGY MR.MOHAMED ELGAYAR MRPROF.NET

• Tunicates exhibit typical chordate characteristics in

their larval stage.

• Deterostome development is a fundamental trait that

must have evolved in a shared ancestor of

echinoderms and chordates.

• Echinoderms

• Even though the classes of echinoderms use their tube

feet differently, they all have them.

• Adult radial symmetry, a water vascular system, and

endoskeletons with spines are the characteristics

specific to echinoderms.

• Invertebrate chordates exhibit an endostyle that is the

precursor of the thyroid gland in vertebrates.

• Echinoderms also use tube feet for respiration.

MRPROF.NET MR.MOHAMED ELGAYAR MRPROF.NET@GMAIL.COM 22