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Figure 6 from: Fossen EI, Ekrem T, Nilsson AN, Bergsten J (2016) Species delimitation in northern European water scavenger beetles of the genus Hydrobius (Coleoptera, Hydrophilidae). ZooKeys 564: 71-120. https://doi.org/10.3897/zookeys.564.6558

Figure 6 - Ultrametric (strict clock) maximum clade credibility (MCC) tree used in GMYC analysis of COI. Terminal names and abbreviations as in Fig. 5. Samples from BOLD are marked with BOLD Sequence ID. Values above branches show Bayesian posterior probability support; values below branches show GMYC-support, i.e. support for the node as a GMYC-species among the alternative models of delimitation considered (95% confidence set). GMYC-support < 0.1 not shown. Splits of thick branches represent speciation events, splits of thin branches indicate within-species coalescent events and splits of red branches depend on the models considered (Table 6). Scale bar represents an artificial time scale with the root at time 1.

Figure 15 from: Fossen EI, Ekrem T, Nilsson AN, Bergsten J (2016) Species delimitation in northern European water scavenger beetles of the genus Hydrobius (Coleoptera, Hydrophilidae). ZooKeys 564: 71-120. https://doi.org/10.3897/zookeys.564.6558

Figure 15 - Comparison of the relative position of trichobothria (red arrows) on the elytra of Hydrobius. A Trichobothria positioned in the intervals between the 2nd and 3rd row of serial punctures, and between the 4th and 5th row. Typical positioning of trichobothria in Hydrobius arcticus, Hydrobius fuscipes fuscipes and Hydrobius fuscipes subrotundus, here represented by a specimen of Hydrobius fuscipes fuscipes B Trichobothria positioned in or very close to the 3rd and 5th row of serial punctures, which is characteristic of Hydrobius fuscipes rottenbergii.

Figure 3 from: Fossen EI, Ekrem T, Nilsson AN, Bergsten J (2016) Species delimitation in northern European water scavenger beetles of the genus Hydrobius (Coleoptera, Hydrophilidae). ZooKeys 564: 71-120. https://doi.org/10.3897/zookeys.564.6558

Figure 3 - The shape of the mesoventral process (character 2.2). Measured in lateral view as an angle (indicated by red lines). Image of Hydrobius fuscipes fuscipes.

Figure 5 from: Fossen EI, Ekrem T, Nilsson AN, Bergsten J (2016) Species delimitation in northern European water scavenger beetles of the genus Hydrobius (Coleoptera, Hydrophilidae). ZooKeys 564: 71-120. https://doi.org/10.3897/zookeys.564.6558

Figure 5 - Majority-rule consensus tree from time-free Bayesian analysis of the concatenated data. Branch support values are posterior probabilities. Samples are labeled with ID-numbers, identified morphotypes and country of origin. Specimens collected in sympatry are also labeled with locality name (Rinnleiret or Motzen). Scale bar indicates expected number of nucleotide substitutions per site. Branches with "\\" have been manually cut. Abbreviations for morphotypes: arc = arcticus, fus = fuscipes, rot = rottenbergii, sub = subrotundus.

Figure 12 from: Fossen EI, Ekrem T, Nilsson AN, Bergsten J (2016) Species delimitation in northern European water scavenger beetles of the genus Hydrobius (Coleoptera, Hydrophilidae). ZooKeys 564: 71-120. https://doi.org/10.3897/zookeys.564.6558

Figure 12 - Morphometric differences between 60 specimens of Hydrobius. a Differences between morphotype and effect of body size on paramere length. Both axes are in logarithmic scale. Independently fitted lines for each morphotype are shown, slopes not significantly different. Type specimens of Hydrobius fuscipes subrotundus and Hydrobius fuscipes rottenbergii are labeled b Box- and whisker-plot showing differences between morphotypes on the ratio length of paramere / length of penis. Top and bottom of boxes represent first and third quartile; dark bands represent the second quartile (median); whiskers show the maximum and minimum values not including outliers (white points). Black points represent type specimens.

Figure 2 from: Fossen EI, Ekrem T, Nilsson AN, Bergsten J (2016) Species delimitation in northern European water scavenger beetles of the genus Hydrobius (Coleoptera, Hydrophilidae). ZooKeys 564: 71-120. https://doi.org/10.3897/zookeys.564.6558

Figure 2 - Measurement of the relative position of trichobothria on the elytra (character 2.1). Dorsal view of anterior part of the elytra, showing how several trichobothria encountered posterior to the scutellum were measured. Each relative position of a trichobothrium was measured by dividing the length from the 3rd row of serial punctures to the trichobothrium (a) by the length from the 3rd row to the 2nd row (a+b). The same was done with trichobothria in or near the 5th row of serial punctures. Image of Hydrobius fuscipes fuscipes.

Figure 14 from: Fossen EI, Ekrem T, Nilsson AN, Bergsten J (2016) Species delimitation in northern European water scavenger beetles of the genus Hydrobius (Coleoptera, Hydrophilidae). ZooKeys 564: 71-120. https://doi.org/10.3897/zookeys.564.6558

Figure 14 - Comparison of the mesoventral process in Hydrobius. A Large and acute process found in all northern European variants of Hydrobius fuscipes, here represented by a specimen of Hydrobius fuscipes fuscipes B Small and blunt process characteristic of Hydrobius arcticus.

Figure 11 from: Fossen EI, Ekrem T, Nilsson AN, Bergsten J (2016) Species delimitation in northern European water scavenger beetles of the genus Hydrobius (Coleoptera, Hydrophilidae). ZooKeys 564: 71-120. https://doi.org/10.3897/zookeys.564.6558

Figure 11 - Morphometric differences between 60 (in a) and 59 (in b) specimens of Hydrobius. Two characters are plotted against each other in each figure with convex hulls used to show overlap in the data between morphotypes. Type specimens and specimens of Hydrobius fuscipes subrotundus and Hydrobius fuscipes fuscipes collected in sympatry (Rinn = locality Rinnleiret (Norway) and Mot = Motzen (Germany)) are labeled. a Curvature of paramere tip plotted against width of paramere in dorsal view. X-axis is in logarithmic scale b Width of paramere in lateral view plotted against the ratio robustness of paramere in dorsal view. Y-axis is in logarithmic scale.

Figure 9 from: Perissinotto R, Bird MS, Bilton DT (2016) Predaceous water beetles (Coleoptera, Hydradephaga) of the Lake St Lucia system, South Africa: biodiversity, community ecology and conservation implications. ZooKeys 595: 85-135. https://doi.org/10.3897/zookeys.595.8614

Figure 9 - Peltodytes sp. 4.10 mm, iSimangaliso Wetland Park, Western Shores (site 6), February 2015 DT Bilton, MS Bird & R Perissinotto leg.

Figure 8 from: Perissinotto R, Bird MS, Bilton DT (2016) Predaceous water beetles (Coleoptera, Hydradephaga) of the Lake St Lucia system, South Africa: biodiversity, community ecology and conservation implications. ZooKeys 595: 85-135. https://doi.org/10.3897/zookeys.595.8614

Figure 8 - Haliplus natalenis Wehncke, 1880 3.72 mm, iSimangaliso Wetland Park, False Bay (site 27), January 2015 DT Bilton, MS Bird & R Perissinotto leg.

Figure 71 from: Perissinotto R, Bird MS, Bilton DT (2016) Predaceous water beetles (Coleoptera, Hydradephaga) of the Lake St Lucia system, South Africa: biodiversity, community ecology and conservation implications. ZooKeys 595: 85-135. https://doi.org/10.3897/zookeys.595.8614

Figure 71 - Laccophilus cryptos Biström, Nilsson & Bergsten, 2015 2.5 mm, iSimangaliso Wetland Park, Western Shores (site 2), July 2014 MS Bird leg.

Figure 70 from: Perissinotto R, Bird MS, Bilton DT (2016) Predaceous water beetles (Coleoptera, Hydradephaga) of the Lake St Lucia system, South Africa: biodiversity, community ecology and conservation implications. ZooKeys 595: 85-135. https://doi.org/10.3897/zookeys.595.8614

Figure 70 - Laccophilus canthydroides Omer-Cooper, 1957 3.24 mm, iSimangaliso Wetland Park, Eastern Shores (site 23), February 2015 DT Bilton, MS Bird & R Perissinotto leg.

Figure 73 from: Perissinotto R, Bird MS, Bilton DT (2016) Predaceous water beetles (Coleoptera, Hydradephaga) of the Lake St Lucia system, South Africa: biodiversity, community ecology and conservation implications. ZooKeys 595: 85-135. https://doi.org/10.3897/zookeys.595.8614

Figure 73 - Laccophilus simplicistriatus Gschwendtner, 1932 3.8 mm, iSimangaliso Wetland Park, Eastern Shores (site 21), February 2015 DT Bilton, MS Bird & R Perissinotto leg.

Figure 72 from: Perissinotto R, Bird MS, Bilton DT (2016) Predaceous water beetles (Coleoptera, Hydradephaga) of the Lake St Lucia system, South Africa: biodiversity, community ecology and conservation implications. ZooKeys 595: 85-135. https://doi.org/10.3897/zookeys.595.8614

Figure 72 - Laccophilus contiro Guignot, 1952 3.30 mm, iSimangaliso Wetland Park, Eastern Shores (site 14), February 2015 DT Bilton, MS Bird & R Perissinotto leg.

Figure 69 from: Perissinotto R, Bird MS, Bilton DT (2016) Predaceous water beetles (Coleoptera, Hydradephaga) of the Lake St Lucia system, South Africa: biodiversity, community ecology and conservation implications. ZooKeys 595: 85-135. https://doi.org/10.3897/zookeys.595.8614

Figure 69 - Derovatellus cf. natalensis Omer-Cooper, 1965 3.91 mm, iSimangaliso Wetland Park, False Bay (site 27), January 2015 DT Bilton, MS Bird & R Perissinotto leg.

Figure 7 from: Perissinotto R, Bird MS, Bilton DT (2016) Predaceous water beetles (Coleoptera, Hydradephaga) of the Lake St Lucia system, South Africa: biodiversity, community ecology and conservation implications. ZooKeys 595: 85-135. https://doi.org/10.3897/zookeys.595.8614

Figure 7 - Dineutus subspinosus (Klug, 1834) 7.85 mm, iSimangaliso Wetland Park, False Bay (site 29), February 2015 DT Bilton, MS Bird & R Perissinotto leg.

Figure 68 from: Perissinotto R, Bird MS, Bilton DT (2016) Predaceous water beetles (Coleoptera, Hydradephaga) of the Lake St Lucia system, South Africa: biodiversity, community ecology and conservation implications. ZooKeys 595: 85-135. https://doi.org/10.3897/zookeys.595.8614

Figure 68 - Methles cribratellus (Fairmaire, 1880) 3.87 mm, iSimangaliso Wetland Park, False Bay (site 27), January 2015 DT Bilton, MS Bird & R Perissinotto leg.

Figure 63 from: Perissinotto R, Bird MS, Bilton DT (2016) Predaceous water beetles (Coleoptera, Hydradephaga) of the Lake St Lucia system, South Africa: biodiversity, community ecology and conservation implications. ZooKeys 595: 85-135. https://doi.org/10.3897/zookeys.595.8614

Figure 63 - Herophydrus nodieri (Régimbart, 1895) 5.66 mm, iSimangaliso Wetland Park, False Bay (site 27), January 2015 DT Bilton, MS Bird & R Perissinotto leg.

Figure 62 from: Perissinotto R, Bird MS, Bilton DT (2016) Predaceous water beetles (Coleoptera, Hydradephaga) of the Lake St Lucia system, South Africa: biodiversity, community ecology and conservation implications. ZooKeys 595: 85-135. https://doi.org/10.3897/zookeys.595.8614

Figure 62 - Herophydrus nigrescens Biström & Nilsson, 2002 5.31 mm, iSimangaliso Wetland Park, False Bay (site 27), January 2015 DT Bilton, MS Bird & R Perissinotto leg.

Figure 59 from: Perissinotto R, Bird MS, Bilton DT (2016) Predaceous water beetles (Coleoptera, Hydradephaga) of the Lake St Lucia system, South Africa: biodiversity, community ecology and conservation implications. ZooKeys 595: 85-135. https://doi.org/10.3897/zookeys.595.8614

Figure 59 - Hydrovatus visendus Biström, 1997 3.10 mm, iSimangaliso Wetland Park, Western Shores (site 6), February 2015 DT Bilton, MS Bird & R Perissinotto leg.