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Angelarctocyon
Taxonomy
Angelarctocyon was named by Tomiya and Tseng (2016).
It was assigned to Amphicyonidae by Tomiya and Tseng (2016).
It was assigned to Amphicyonidae by Tomiya and Tseng (2016).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 2016 | Angelarctocyon Tomiya and Tseng p. 8 figs. 3 and 4 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
G. †Angelarctocyon Tomiya and Tseng 2016
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†Angelarctocyon australis Gustafson 1986
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| S. Tomiya and Z. J. Tseng 2016 | Differs from: (i) non-amphicyonid carnivoraforms in M1 lingual cingulum lingually elongate with a sharp lingual margin (Character AC1, State 1); (ii) other amphicyonids except G. cognita in more gracile dentition; (iii) G. cognita in more labial (rather than anterior) direction of M1 parastylar region, more robust paracone and metacone of M1, shallow and expansive lingual slope of M1 protocone; and M2 with labiolingually narrower trigon basin (apex of protocone is located approximately halfway between the level of paracone–metacone apices and lingual margin of tooth; figure 3c). Further differs from ‘daphoenine’ amphicyonids in greater anteroposterior constriction of lingual portion of M1, more labial direction of M1 parastylar region and larger M2 (length across paracone and metacone is comparable with that on M1). Further differs from: (i) Miacis parvivorus in shorter M1 stylar shelf labial to base of metacone (Character AC2, State 1), less pronounced height difference between M1 paracone and metacone, greater swelling of M1 lingual cingulum (Character 50, State 2), more elongate p4 main cuspid across its base (including the portion that bears the posterior accessory cuspulid, this length is approximately 120% of the height of the main cuspid (measured from its apex to the junction of anterior and posterior roots) compared with approximately 73% in USNM 214706), more dorsal position of p4 posterior accessory cuspulid, more open m1 trigonid, more robust m1 entoconid and more elongate m2 (m2L/W>1.51 compared with 1.36 for AMNH FM 5019); (ii) basal arctoids (possibly ursidans) Amphicynodon, Pachycynodon and early stem ursids such as cephalogalines (cf. [21,27,28]) in more acute and anteroposteriorly constricted P4 protocone, relatively taller M1 paracone and metacone, greater anteroposterior constriction of M1 lingual portion, labiolingually wider M1 stylar shelf (not reduced to a mere rim), more triangular outline of M2, more closed m1 trigonid and less reduced m2 paraconid; (iii) early stem ursids in greater lingual elongation and lingual orientation of M1–2 lingual cingula (figure 5d). |