Tetrapods are characterized by
Tetrapoda comprises vertebrate superclass where paired lobe fins transformed into four articulated limbs bearing digits formed via distal Hoxa13 d patterning, AER signaling and endochondral ossification producing stylopod humerus femur, zeugopod radius ulna tibia fibula and autopod carpals tarsals and digits. Limbs possess wrist ankle joints allowing weight support on land, muscular girdles and digits even in secondarily limbless snakes and caecilians retain vestigial girdles. Two pairs of fins describe piscine condition, absence of neck or paired fins anatomically inaccurate description of tetrapod.
Ref: Campbell Biology 12th ed. Chapter 34 Tetrapoda Characteristics; Benton Vertebrate Palaeontology Tetrapod Origin