As the boundary of polar cap, we select 75° MLAT, based on the estimates of cusp position made by Newell et al. (1989) and Russell (2000) and the Feldstein model results for the auroral oval poleward boundary.
We therefore conclude that the central cusp of stem and early crown lagomorphs should also be considered the metaconule, based on the topographic position of the cusp and its connection to the metacone via the premetaconule crista (Fig. 7, but see also figs. 1 and 2).
Here we present newly described fossil duplicidentates (Lagomorpha and Mimotonidae) in the context of a well-constrained phylogeny to establish a nomenclatural system for cusps based on the tribosphenic pattern.
It seems that many early workers were framing their ideas of the homology of the central cusp based on which tribosphenic cusp was the primary cusp.
In his first treatment [5], he suggested that the central cusp of lagomorphs might be the protocone (or possibly, the metacone) based on the presence of two prominent buccal cusps, interpreted as the paracone and metacone.
Ms. Fariña said the decision to focus on students on the cusp of promotion was based on the advice of a group of experts within the department, who argued that students with no chance of moving to the next grade were often unmotivated to leave the swimming pool or basketball court for class.
Indeed, at the Grotte du Renne, Leroi-Gourhan found about 30 Neandertal teeth in the Châtelperronian levels, which can be distinguished from modern human teeth based on the size and shape of their cusps and other features.
The central cusp of the premolars was interpreted as the paracone or amphicone based on the study of P4s of Mimotona, which shows one primary buccal cusp in premolars.
Van Valen [20] later suggested that the central cusp of lagomorphs could be the metaconule based on the presence of an enlarged metaconule in Mimotona.
Based on the study of mimotonid material, it is clear that the prominent central cusp is homologous with the metaconule.
