Osteology Of The Middle Eocene Ceratomorph Hyrachyus Modestus (Mammalia, Perissodactyla) Author Bai, Bin Author Meng, Jin Author Wang, Yuan-Qing Author Wang, Hai-Bing Author Holbrook, Luke text Bulletin of the American Museum of Natural History 2017 2017-06-09 2017 413 1 68 http://www.bioone.org/doi/10.1206/0003-0090-413.1.1 journal article 10.1206/0003-0090-413.1.1 0003-0090 4612938

TABLE 7 Measurements of radii of Hyrachyus modestus and Hyrachyus eximius (mm) APD = anteroposterior distance; PAF = proximal articular facet.

	Hyrachyus modestus (AMNH FM 12664)	Hyrachyus eximius (AMNH FM 93050)
a Approximate measurements.
1. Total length	158.0	210.0
2. Proximal end, width	25.0	39.9
3. Proximal end, APD	17.0	24.9
4. Distal end, width	25.1	40.5
5. Distal end, APD	19.1	25.7a
6. Distal articular facet, width	24.0	32.7
7. Width at middle of shaft	17.0	24.0
8. APD at middle of shaft	11.0	15.6
9. Medial PAF, width×APD	12.3×16.3	19.9×23.2
10. Lateral PAF, width×APD	14.1×15.2	23.1×22.0
11. Lunar facet, APD	10.6	16.3
12. Scaphoid facet, APD	13.3	18.6
Ratio (%)
2:1	15.8	19.0
4:1	15.9	19.3
7:2	67.8	60.1
12:11	125.2	113.8
1. Total L	194.0	?
2. Trochlear notch, height	23.5	30.5
3. W at upper 1/3 of trochlear notch	11.6	16.4
4. Trochlear notch, maximum W	21.9	32.0
5. Olecranon, height	38.5	46.4
6. Olecranon, W	15.1	18.8
7. L of post-super. border of olecranon	26.8	34.0
8. W at middle of shaft	8.3	16.1
9. APD at middle of shaft	14.4	16.6
10. Cuneiform articular facet, W	12.8	?
11. Cuneiform articular facet, APD	9.4	?
Ratio (%)
3:4	53.0	51.1
2:5	61.0	65.7
6:7	56.5	55.3
8:9	57.6	96.9
10:11	136.6	?