Dryopithecus pattern is the characteristic feature of:
Permanent mandibular 1st molar.
Permanent mandibular 3rd molar.
Permanent maxillary 2nd molar.
Permanent maxillary canine.
In a mandibular first molar mesiolingual cusp joins the distobuccal cusp along the floor of the central fossa, this is known as dryopethicus pattern.