. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Arctostylopids (Mammalia) • Cifelli ei al. 3]. Figure 11. Hypothesized relationships among the Arctostylopidae. Characters at nodes (see Table 4): 1) metaconid added to P3, pseudohypocone on at least one upper molar, upper molar paracone fold lost, ectocingulid developed on lower molars, ectocingulid developed on P4, P4 talonid curved, upper molar parastyle enlarged; 2) lower molar cristid obliqua attaches Imgually to rear of trigonid; 3) M3 elongate? (condition unknown in S. promissus), 4) lower molar entolophid well
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Arctostylopids (Mammalia) • Cifelli ei al. 3]. Figure 11. Hypothesized relationships among the Arctostylopidae. Characters at nodes (see Table 4): 1) metaconid added to P3, pseudohypocone on at least one upper molar, upper molar paracone fold lost, ectocingulid developed on lower molars, ectocingulid developed on P4, P4 talonid curved, upper molar parastyle enlarged; 2) lower molar cristid obliqua attaches Imgually to rear of trigonid; 3) M3 elongate? (condition unknown in S. promissus), 4) lower molar entolophid well developed, lower molar cristid obliqua attaches labially to rear of trigonid, lower molar ectocingulid strong and pillarlike, P4 paraconid shifted labiaily. lower molar paracristid lost; 5) shearing notch developed on P4 talonid, P3^ paracone fold lost, canines lesser differentiated. 6) second molars enlarged, pseudohypocone lost on M1?; 7) upper molar protocristae salient, M2 pseudohypocone reduced9, parastyle fold on ectoloph of posterior upper cheek teeth lost, ectoloph of upper molars anteropostenorly elongate, cheek teeth very high crowned. anterior to the protoconid on the lower molars, which are not known for Anato- lostylops). This facet is lacking in Arcto- stylops, Palaeostylops, and Gashatosty- lops, which apparently had singly opposing upper and lower cheek teeth. An hypothesis of interrelationships of the Arctostylopidae is given in Figure ll7 (Ka- zachostylops occidentalis, which we have not examined first-hand, and Allostylops 7 The absence of a chronologic dimension is due to uncertainties of relative age, not our lack of appre- ciation for this consideration. periconatus, poorly known and of doubt- ful affinities, have been omitted from this phylogeny). Asiostijlojis spanios is the most primitive taxon known and i^ considered to represent the sister group of all remain- ing taxa. Bothriostylops spp, unique in .it least one character (the presence o\ .i hy- p
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