The parietal eye, or "third eye," on this animal's forehead is by far the most developed of any extant tetrapod. For 10 points each:
[10h] Name this "living fossil," the only extant member of the once-diverse reptile order Rhynchocephalia (RINK-oh-sef-AIL-yuh).
ANSWER: tuatara [or Sphenodon punctatus; or sphenodon]
[10e] The parietal eye is connected to this part of the brain that regulates the circadian rhythm by producing hormones such as melatonin.
ANSWER: pineal gland [or conarium; or epiphysis cerebri]
[10m] The tuatara's closest living relatives are the squamates, consisting of snakes, amphisbaenians, and this paraphyletic group from which both evolved. This group of reptiles includes the basilisk, which can run on water, and the venomous Gila monster.
ANSWER: lizards
<Gerhardt Hinkle , Science - Biology - Mixed/Any>