Which of the following is not included in the timeline of the Genus Homo?

The correct choice, which indicates that Homo sapiens neanderthalensis is not included in the timeline of the Genus Homo, is grounded in the classification of Neanderthals. Neanderthals are classified as a subspecies of Homo sapiens, rather than as a separate species within the Genus Homo. The full designation, Homo sapiens neanderthalensis, refers specifically to the subspecies that lived alongside early modern humans but does not represent a unique species on the same level as Homo erectus or Homo floresiensis.

In contrast, Homo sapiens refers to modern humans, Homo erectus is one of the earliest known hominins to display human-like body proportions, and Homo floresiensis, often referred to as the "Hobbit," represents a distinct species known for its small stature. These classifications establish each of these as separate entities within the timeline of human evolution, whereas Neanderthals, being classified as a subspecies of modern humans, fall outside this particular grouping of the Genus Homo based on species criteria. This distinction underscores the varied lineage and classification systems within paleoanthropology.