Explore Paranthropus, Australopithecus and Homo dentition evidence, including jaw counts, canine or molar size and the fossil shift toward omnivorous diets in IB Biology SL B4.2.8.
Scientists examined the teeth of a group of related species of cichlid fishes in Lake Tanganyika, Africa, to determine their evolutionary relationship. The group contains six species from two genera, Perissodus and Haplotaxodon. The chart shows the number of teeth per jaw of these species and indicates whether each is adapted to feed in shallow water or deep water. Species from the genus Perissodus are known for their unique feeding habit of eating the scales of other fish.
Key: ○ upper jaw • lower jaw □ shallow water ! deep water
State the mean number of teeth on the upper jaw of P. straeleni.
Compare the teeth on the upper and lower jaw of P. elaviae and P. hecqui.