Paleoanthropology

Step 1: Understanding the Concept:
The australopithecines are a group of extinct hominins. Paleoanthropologists classify them into two main morphological groups: "gracile" and "robust." This classification is based primarily on features related to chewing, such as the size of the teeth, jaws, and chewing muscles.
- Gracile australopithecines had a lighter build, especially in the skull and teeth. Their jaws were less massive, and their molars were smaller.
- Robust australopithecines (often placed in the genus Paranthropus) had massive jaws, enormous molars, and prominent sagittal crests on their skulls for the attachment of large chewing muscles.
Step 2: Detailed Explanation:
Let's classify each species:
- A. A. africanus: This is the classic example of a gracile australopithecine from South Africa.
- B. A. boisei: Also known as Paranthropus boisei, this species is the epitome of a "hyper-robust" australopithecine from East Africa, known for its massive jaws and molars. It is not gracile.
- C. A. afarensis: This East African species, famously represented by the "Lucy" fossil, is a gracile australopithecine.
- D. A. anamensis: This is one of the earliest australopithecine species and is considered a gracile form.
Step 3: Final Answer:
The species classified as gracile australopithecines are A. africanus, A. afarensis, and A. anamensis. A. boisei is a robust australopithecine. Therefore, the correct combination is A, C, and D only.

Step 1: Understanding the Concept:
This question requires knowledge of the history of paleoanthropology, specifically matching important hominin species with the scientists who discovered and/or named them.
Step 2: Detailed Explanation:
- A. A. afarensis: The most famous specimen is "Lucy," discovered in Ethiopia in 1974 by a team led by American paleoanthropologist Donald Johanson. So, A matches with III.
- B. A. boisei: The type specimen, OH 5 or "Zinjanthropus," was discovered at Olduvai Gorge, Tanzania, in 1959 by Mary Leakey. Her husband, Louis Leakey, was the director of the expedition and initially named the species. So, B matches with IV.
- C. A. africanus: The type specimen is the "Taung Child," a fossilized skull of a young individual discovered in 1924 in Taung, South Africa. It was identified and named by Australian anatomist Raymond Dart. So, C matches with I.
- D. A. robustus: The type specimen was found at Kromdraai, South Africa, and the species was named in 1938 by Scottish-South African doctor and paleontologist Robert Broom. So, D matches with II.
Step 3: Final Answer:
Combining the matches:
A III
B IV
C I
D II
The correct combination is A-III, B-IV, C-I, D-II, which corresponds to option (D).