Table 1. Order of magnitude length of organisms.

Taxa	Size (m)	Reference
Bacteria, bacterioplankton	10−6	Clifford 1991 [33]
Algae, phytoplankton	10−5	Clifford 1991
Diatoms	10−5	Krammer 1986–1991 [34]
Chydorids (Chydoridae)	10−4	Pennak 1989 [35]
Planktonic crustaceans	10−4	Pennak 1989
Planktonic rotifers	10−4	Pennak 1989
Zooplankton	10−4	Clifford 1991
Chironomids (Chironomidae)	10−3	Clifford 1991
Heteroptera	10−3	Clifford 1991
Macroinvertebrates	10−3	Townsend et al. 2008 [36]
Beetles (Coleoptera)	10−2	Clifford 1991
Caddisflies (Trichoptera)	10−2	Clifford 1991
Crayfish (Astacoidea)	10−2	Pennak 1989
Dragonflies (Odonata)	10−2	Clifford 1991
Gastropods (Gastropoda)	10−2	Pennak 1989
Mayflies (Ephemeroptera)	10−2	Clifford 1991
Molluscs (Mollusca)	10−2	Pennak 1989
Stoneflies (Plecoptera)	10−2	Clifford 1991
Amphibians	10−2	King and Behler [37]
Fish	10−1	Holm et al. 2009 [38]

Names and size of organisms used in studies testing species richness cross-taxon congruence in aquatic ecosystems. Names refer specifically to those employed in the text of the studies included in the meta-analysis. References for body size estimates (orders of magnitude) are included here.