A revision of the four Afrotropical and Palaearctic Sphyracephala Say (Diptera, Diopsidae) with an illustrated overview of the other five Sphyracephala Author Feijen, Hans R. 0000-0002-7265-8448 Naturalis Biodiversity Center, P. O. Box 9517, 2300 RA Leiden, Netherlands Author Feijen, Frida A. A. 0000-0001-5872-8780 ETH Zürich, Department of Environmental Systems Science, Institute of Integrative Biology (IBZ), 8092 Zürich, Switzerland & EAWAG, Aquatic Ecology, Dübendorf, Switzerland Author Feijen, Cobi 0000-0001-8756-3903 Naturalis Biodiversity Center, P. O. Box 9517, 2300 RA Leiden, Netherlands text ZooKeys 2025 2025-06-10 1241 1 81 journal article 310381 10.3897/zookeys.1241.151490 b61e1f46-07df-41f0-84ab-1d49e78b9253 E0BA0012-F063-43B8-926B-8DD47010D489

Table 2. Quantitative characters for Sphyracephala species: ratio eye span / body length and allometric line for eye span on body length, length / width ratio of fore femur. Species are arranged in species groups and subtaxa.
Sphyracephala		span / body	allometric line		n	fore femur		n
Sphyracephala		ratio	slope	dimorphism	n	l / w ratio	range	n
S. brevicornis	♀	0.43 ± 0.00	0.30 ± 0.01	0.04	203	2.67 ± 0.02	2.62–2.72	6
S. brevicornis	♂	0.44 ± 0.00	0.34 ± 0.02		131	2.65 ± 0.06	2.59–2.71	2
S. subbifasciata	♀	0.41 ± 0.00	0.27 ± 0.04	0.01	32	2.43	–	1
S. subbifasciata	♂	0.43 ± 0.00	0.28 ± 0.07		16	2.43	–	1
S. nigrimana	♀	0.38			1	2.86	–	1
S. nigrimana	♂	0.40			1	2.73	–	1
S. babadjanidesi	♀	0.52 ± 0.03	0.54 ± 0.03	0.39	38	2.74 ± 0.03	2.69–2.80	3
S. babadjanidesi	♂	0.60 ± 0.05	0.93 ± 0.06		41	2.82 ± 0.02	2.79–2.85	3
S. munroi	♀	0.61 ± 0.00	0.74 ± 0.03	0.33	40	3.63 ± 0.06	3.36–3.90	10
S. munroi	♂	0.67 ± 0.00	1.07 ± 0.06		40	3.63 ± 0.03	3.50–3.83	10
S. hearseiana	♀	0.51 ± 0.00	0.51 ± 0.02	0.05	15	2.44 ± 0.02	2.30–2.55	15
S. hearseiana	♂	0.53 ± 0.00	0.56 ± 0.03		15	2.48 ± 0.02	2.37–2.60	15
S. beccarii	♀	0.49 ± 0.00	0.49 ± 0.02	0.07	40	2.48 ± 0.02	2.40–2.61	10
S. beccarii	♂	0.53 ± 0.00	0.56 ± 0.03		40	2.53 ± 0.03	2.42–2.80	15
S. detrahens	♂	0.63			1	3.06	–	1
S. bipunctipennis	♀	0.49 ± 0.01	0.58 ± 0.15		4	3.46 ± 0.03	3.43–3.54	4
S. bipunctipennis	♂	0.62			1	3.49 ± 0.13	3.36–3.62	2
S. nr detrahens, Solomon Islands	♀	0.73 ± 0.01	0.97 ± 0.07	0.67	14	3.11 ± 0.06	2.81–3.36	9
S. nr detrahens, Solomon Islands	♂	0.78 ± 0.01	1.63 ± 0.07		20	3.11 ± 0.03	2.96–3.23	10
S. nr detrahens, Japan	♀	0.73 ± 0.01	1.03 ± 0.06		6	3.19 ± 0.01	3.15–3.20	6
S. nr detrahens, Japan	♂	0.78 ± 0.02	1.40 ± 0.11		4	3.25 ± 0.02	3.20–3.29	4