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Fona herzogae
Taxonomy
Fona herzogae was named by Avrahami et al. (2024). Its type specimen is NCSM 33548, a skeleton (a single partially articulated, nearly complete skeleton), and it is a 3D body fossil. Its type locality is Karmic Orodromine locality, which is in a Cenomanian terrestrial mudstone in the Cedar Mountain Formation of Utah. It is the type species of Fona.
Synonymy list
| Year | Name and author |
|---|---|
| 2024 | Fona herzogae Avrahami et al. p. 3725 figs. 5-33 |
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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.
†Fona herzogae Avrahami et al. 2024
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| H. M. Avrahami et al. 2024 | Fona herzogae is a small-bodied, early diverging ornithischian with the following unique combination of characters (autapomorphies are denoted with an asterisk) (Figure 5) *(1) a rostral maxillary fossa located caudal to the first tooth position (unknown in Oryctodromeus and possibly shared by Isaberrysaura and Haya); *(2) an otoccipital that bears a dorsoventrally elongate fossa on the medial surface of the occipital condyle located directly caudal to the medial opening of CN XII; *(3) a rostrocaudally oriented ventral canal on the prootic; *(4) The dorsal margin of the axis neural spine is parallel with the dorsal suture of the centrum, forming an angle of essentially ~0°. *(5) Ischial shaft has bulbous thickening along the dorsal margin directly distal to the obturator process (prominent on both ischia of at least two individuals and weakly present on only the right of another.) (6) base of the prepubic process bears a prominent lateral swelling (possibly present but significantly reduced in Oryctodromeus and Th. neglectus). (7) the caudoventral prong of the jugal's caudal process underlaps a groove along the ventral margin of the quadratojugal (shared by Th. neglectus, likely Changmiania, and possibly at least one specimen of Jeholosaurus [STMN 23–17]). (8) dentary teeth with vertical wear facets on the labial surface that terminate abruptly near the crown base to form a mesiodistally inclined shelf (shared by Orycto- dromeus). (9) A low, round tuberosity on the medial side of the scapula located directly opposite to the glenoid ridge (shared with Oryctodromeus and possibly Iani smithi). Standard skeletal measurements of NCSM 33548 are provided in Table 1. Characters 7–9 serve as important synapomorphies that help place Fona within Thescelosaurinae. |
Measurements
No measurements are available
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| Source: o = order | |||||
| Reference: Marsh 1875 | |||||
Age range: Cenomanian or 100.50000 to 93.90000 Ma
Collections (3 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Cenomanian | USA (Utah) | Fona herzogae (235574) | |
| Early/Lower Cenomanian | USA (Utah) | Fona herzogae (type locality: 235540) Ornithopoda indet. (228453) |