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Gustafsonia cognita
Taxonomy
Miacis cognitus was named by Gustafson (1986). Its type locality is Reeves Bonebed, which is in a Chadronian terrestrial horizon in Texas. It is the type species of Gustafsonia.
It was recombined as Gustafsonia cognita by Tomiya and Tseng (2016).
It was recombined as Gustafsonia cognita by Tomiya and Tseng (2016).
Synonymy list
| Year | Name and author |
|---|---|
| 1986 | Miacis cognitus Gustafson |
| 2016 | Gustafsonia cognita Tomiya and Tseng p. 6 fig. 2 |
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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.
†Gustafsonia cognita Gustafson 1986
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| S. Tomiya and Z. J. Tseng 2016 | Differs from: (i) non-amphicyonid carnivoraforms in deep basioccipital embayment for the inferior petrosal sinus (Character 31, State 2; figure 2c–f), M1 lingual cingulum lingually elongate with a sharp lingual margin (Character AC1, State 1; figure 2a,b), and where applicable, smaller M3 relative to M2 (M3LxW/M2LxW = 0.16); (ii) other amphicyonids in more gracile dentition and more lingual position of M2 protocone (figure 2a,b). Further differs from: (i) M. parvivorus in the presence of canal on basisphenoid for anterior loop of internal carotid artery (‘cica’ in figure 2e; Character 23 State 1), likely medial passage of internal carotid artery suggested by the absence of groove (for promontory artery) on petrosal promontorium (Character 25, State 2; see also ([9], p. 28)), ventral deflection of lateral edge of basioccipital small but present (Character 34, State 1), shorter M1 stylar shelf labial to base of metacone (Character AC2, State 1), the absence of wide trough between mastoid process and paroccipital process (Character 33, State 1; but a narrow, somewhat trough- like depression is present), and greater swelling of lingual M1 cingulum (Character 50, State 2; but note the ‘swelling’ is primarily in the lingual rather than ventral direction); (ii) Lycophocyon and canoids in anteriorly elongate and rounded petrosal promontorium (Character 28, State 1); (iii) canoids in smaller lateral flange of basioccipital (Character 34, State 1), M3 present (Character 53, State 0), a steeper angle of M1 postprotocrista (approx. 79° from preprotocrista compared with, e.g. greater than 90° in canids; Character AC3, State 0) and the absence of securely attached ossified auditory bulla (Character AC9, State 0); (iv) Cynodictis in more lingual (as opposed to posterolingual) orientation of M1 lingual cingulum, deeper M1 ectoflexus formed by slight labial projection of the posterolabial border of tooth and larger M2 relative to M1 (M2LxW/M1LxW = 0.57 compared with approx. 0.29 for C. lacustris ([51], pl. 2, fig. 5)). |