Table 2.

Summary statistics for lengths of spicules of Heligmosomoides polygyrus from Apodemus sylvaticus sampled in various counties in the British Isles

Species	Locality	n	Mean length (mm)±	s.e.m.	Range
					Minimum	Maximum
Session 1
H. polygyrus	Cornwall	16	0.612	0.0068	0.567	0.655
H. polygyrus	Dorset	50	0.564	0.0054	0.467	0.662
H. polygyrus	Midlothian	22	0.634	0.0085	0.554	0.680
H. polygyrus	Norfolk	42	0.615	0.0048	0.552	0.668
H. polygyrus	Nottinghamshire	34	0.567	0.0082	0.465	0.668
H. polygyrus	Staffordshire	54	0.585	0.0034	0.535	0.633
Session 2
H. polygyrus	Aberdeenshire	20	0.626	0.0107	0.551	0.710
H. polygyrus	Anglesey	20	0.613	0.0046	0.585	0.645
H. polygyrus	Dorset	20	0.600	0.0082	0.550	0.682
H. polygyrus	Durham	20	0.591	0.0062	0.551	0.638
H. polygyrus	Lincolnshire	16	0.593	0.0093	0.550	0.651
H. polygyrus	Nottinghamshire	50	0.604	0.0049	0.551	0.668
H. polygyrus	Midlothian	20	0.627	0.0061	0.586	0.677
H. polygyrus	Mid. Irelanda	12	0.635	0.0080	0.583	0.679
Session 3
H. polygyrus	Anglesey	30	0.583	0.0046	0.543	0.644
H. polygyrus	Nottinghamshire	18	0.617	0.0049	0.581	0.644
Combined data		444	0.598	0.0019	0.465	0.710

^aTheses isolates were from wood mice caught in several locations in Mid Ireland as follows: Rhode, Offally; Vicarstown, Laois; Brackagh, Offally; Slieve Bloom Mts, Laois.