Table 1 Descriptive statistics of glochidia for each species measured during this study in comparison to other measurements of the same species. N sample size, SD standard deviation, Min. minimum, Max. maximum, range refers to the maximum difference recorded in all presented data, range/mean size range of the glochidium length variability standardized by the averaged mean sizes presented in the table, (–) not available.

Species	Site	N	Mean [mm]	SD	Min [mm]	Max [mm]	Range min.–max [mm]	Range/mean size	Source
Anodonta anatina		30	0.36	–	–	–	–	–	³⁵
		–	–	–	0.35	0.36	0.01	–	³⁶
		–	0.36	–	–	–	–	–	³⁷
		–	0.35	–	–	–	–	–	³⁸
		–	0.36	–	–	–	–	–	³⁹
		–	0.50	0.08	0.45	0.57	0.12	0.24	²⁸
		–	0.34	0.02	0.34	0.42	0.08	0.24	²⁸
		–	–	–	0.27	0.57	0.3	–	^40,41
		–	–	–	0.33	0.38	0.05	–	⁴²
		30	0.36	0.02	–	–	–	–	⁴³
		–	0.35	–	–	–	–	–	⁴⁴
		–	0.34	–	–	–	–	–	⁴⁵
		7	0.36	0.04	0.35	0.36	0.01	0.03	⁴⁶
		1110	0.41	0.02	0.31	0.47	0.16	0.39	This study
	Mean	∑ = 1177	0.37	0.04	0.36	0.46	0.1	0.27
Anodonta cygnea		30	0.32	–	–	–	–	–	³⁵
		–	0.35	–	–	–	–	–	⁴⁷
		–	–	–	0.27	0.36	0.09	–	^40,41
		2	0.32	0.05	0.31	0.34	0.03	0.09	⁴⁸
		–	0.32	–	–	–	–	–	⁴⁴
		–	0.31	–	–	–	–	–	⁴⁵
		–	0.34	–	–	–	–	–	⁴⁹
		9	0.35	0.04	0.34	0.36	0.02	0.06	⁵⁰
		990	0.33	0.01	0.25	0.37	0.12	0.36	This study
	Mean	∑ = 1031	0.33	0.03	0.31	0.38	0.07	0.21
Unio crassus		–	–	–	0.18	0.23	0.05	–	^40,41
			0.22				–	–	⁴⁵
	PL: Biała	330	0.20	0.004	0.19	0.22	0.03	0.15	This study
	PL: San	450	0.20	0.010	0.17	0.23	0.06	0.30	This study
	PL: Cedron	150	0.21	0.005	0.20	0.23	0.03	0.14	This study
	PL: pulled	930	0.20	0.008	0.17	0.23	0.06	0.30	This study
	Mean	∑ = 930	0.21	0.006	0.19	0.23	0.04	0.19
Unio tumidus		–	–	–	0.19	0.22	0.03	–	^40,41
		–	0.20	–	–	–	–	–	⁵⁰
		–	0.21	–	–	–	–	–	⁴⁵
		720	0.21	0.007	0.18	0.25	0.07	0.33	This study
	Mean	∑ = 720	0.21	0.007	0.19	0.24	0.05	0.24

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