Table 2. Comparative table showing skeletal element ratios among anurognathids.

Anurognathidae	hu/mcIV	hu/fe	hu/ul	hu+ul/fe+ti	ul/mcIV	ul/fe	sc/co	ph1d4/ul+ mcIV	ph1d4/ ti	ph2d4/ ph1d4	ph3d4/ ph1d4	ph3d4/ ph2d4	ph4d4/ ph1d4	fe/mcV	ti/fe	mtIII/ti	caS/fe
Anurognathus ammoni (holotype)	2.91	1.19	0.70	1.16	4.18	1.70	?	1.01	1.49	?	?	?	?	2.45	1.44	0.46	0.50
Anurognathus ammoni (referred)	3.64	1.25	0.70	1.26	5.10	1.76	?	0.95	1.44	0.77	0.44	0.56	?	2.90	1.39	0.42	?
Vesperopterylus lamadongensis	2.75	1.35	0.74	1.34	3.73	1.83	0.97	0.96	1.64	0.81	0.60	0.74	0.12	2.04	1.37	0.47	0.59
Jeholopterus ningchengensis (holotype)	3.26	1.55	0.70	1.67	4.68	2.22	1.96	0.86	1.86	0.88	0.65	0.73	0.17	2.10	1.25	0.44	?
Jeholopterus ningchengensis (CAGS IG 02-81)	3.39	1.52	0.78	1.59	4.03	1.99	1.28	0.88	1.88	0.89	?	?	?	2.02	1.22	0.47	?
Dendrorhynchoides curvidentatus	2.99	1.43	0.78	1.37	3.82	1.82	1.15	0.99	1.66	0.80	?	?	?	2.4	1.37	0.45	?
Luopterus mutoudengensis holotype	2.45	1.28	0.64	1.44	3.81	2.00	1.88	0.94	1.85	0.82	0.50	0.61	0.10	1.91	1.29	0.44	>0.86
NJU–57003	2.60	1.34	0.60	1.42	4.31	2.15	1.27	0.90	1.63	0.86	0.40	0.46	0.10	1.97	1.47	0.45	1.78
IVPP V16728	?	1.43	?	?	?	?	?	?	?	?	?	?	?	?	~1.40	0.38	>1.49
Sinomacrops bondei	3.55	1.77	0.66	1.51	5.29	2.70	1.42	0.97	1.59	0.87	0.44	0.50	?	~2	1.99	0.48	>1.69
Batrachognathus volans	?	1.93	?	?	?	?	?	?	?	?	?	?	?	?	1.75	?	1.47*

Note:

The asterisk indicates a value taken from the referred specimen of Batrachognathus volans (Costa et al., 2013). The other values for this species were taken from the holotype (Riabinin, 1948).