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Figures 1-8 from: Lin R, Jia F, Fikáček M (2016) A review of Elocomosta Hansen with a description of a new species with reduced eyes from China (Coleoptera, Hydrophilidae, Sphaeridiinae). ZooKeys 607: 81-92. https://doi.org/10.3897/zookeys.607.7142

Figures 1-8 - General habitus and genitalia of Elocomosta species. 1–3 Elocomosta nigra Hansen, 1989, paratype (1 dorsal 2 lateral 3 frontal view) 4–6 Elocomosta lilizheni sp. n., paratype (4 dorsal 5 lateral 6 frontal view) 7–8 aedeagus (7 Elocomosta lilizheni sp. n., holotype 8 Elocomosta nigra, adapted from Hansen (1989).

Figures 26-33 from: Lin R, Jia F, Fikáček M (2016) A review of Elocomosta Hansen with a description of a new species with reduced eyes from China (Coleoptera, Hydrophilidae, Sphaeridiinae). ZooKeys 607: 81-92. https://doi.org/10.3897/zookeys.607.7142

Figures 26-33 - External morphology of Elocomosta species. 26–27 lateral portion of pronotum (26 Elocomosta nigra Hansen, 1989 27 Elocomosta lilizheni sp. n.). 28–29 details of elytral punctation and trichobothria (28 Elocomosta nigra 29 Elocomosta lilizheni) 30 prosternum of Elocomosta lilizheni 31–32 posterior leg (31 Elocomosta lilizheni 32 Elocomosta nigra) 33 abdomen of Elocomosta lilizheni.

Figures 9-17 from: Lin R, Jia F, Fikáček M (2016) A review of Elocomosta Hansen with a description of a new species with reduced eyes from China (Coleoptera, Hydrophilidae, Sphaeridiinae). ZooKeys 607: 81-92. https://doi.org/10.3897/zookeys.607.7142

Figures 9-17 - External morphology of Elocomosta species. 9–10 ventral morphology, general view (9 Elocomosta nigra Hansen, 1989 10 Elocomosta lilizheni sp. n.) 11–12 head, ventral view (11 Elocomosta nigra 12 Elocomosta lilizheni) 13–14 detail of the ocular region of the head, dorsal view (13 Elocomosta nigra 14 Elocomosta lilizheni) 15–16 head appendages of Elocomosta nigra (15 antenna 16 maxillary palpus and galea) 17 anterior margin of head of Elocomosta lilizheni in dorsal view, showing largely exposed labrum.

Figures 18-25 from: Lin R, Jia F, Fikáček M (2016) A review of Elocomosta Hansen with a description of a new species with reduced eyes from China (Coleoptera, Hydrophilidae, Sphaeridiinae). ZooKeys 607: 81-92. https://doi.org/10.3897/zookeys.607.7142

Figures 18-25 - External morphology of Elocomosta species. 18–19 profemur (18 Elocomosta nigra Hansen, 1989 19 Elocomosta lilizheni sp. n.). 20–21 punctation of pronotum and elytral base (20 Elocomosta lilizheni 21 Elocomosta nigra) 22–23 meso- and metaventral morphology (22 Elocomosta nigra 23 Elocomosta lilizheni) 24–25 details of mesoventral plate and metaventral process (24 Elocomosta nigra 25 Elocomosta lilizheni).

Figure 9 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 9 - Male genitalia of Hydrobius morphotypes in dorsal view. A Hydrobius fuscipes fuscipes B Hydrobius fuscipes subrotundus C Hydrobius fuscipes rottenbergii D Hydrobius arcticus.

Figure 8 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 8 - Species tree with the largest posterior probability from BPP v3.0 analyses conducted on Hydrobius specimens. Multi-locus data (COI, H3 and ITS2) used with Hydrobius convexus included as outgroup. Values above branches indicate range of split posterior probabilities, i.e. the probability for the node representing a speciation event, from four different prior-combinations. Values in red have split probabilities < 1.0. *Clade VII only delimited when specimens from Clade VII were a priori assigned as a potential species separate from Hydrobius arcticus and Hydrobius fuscipes rottenbergii.

Figure 17 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 17 - Habitus of Hydrobius morphotypes in dorsal view. A Hydrobius arcticus B Hydrobius fuscipes rottenbergii C Hydrobius fuscipes fuscipes D Hydrobius fuscipes subrotundus.

Figure 16 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 16 - Morphometric differences between morphotypes and effect of body size on Elytral Index (EI) of Hydrobius. EI = length of the elytra / maximum width of elytra. 113 specimens measured. Independently fitted lines for each morphotype are shown, slopes not significantly different. Type specimens and specimens of Hydrobius fuscipes subrotundus and Hydrobius fuscipes fuscipes collected in sympatry (Rinn = locality Rinnleiret (Norway), Mot = Motzen (Germany) and Ola = Öland (Sweden)) are labeled.

Figure 10 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 10 - Male genitalia of Hydrobius morphotypes in lateral view. A Hydrobius arcticus B Hydrobius fuscipes rottenbergii C Hydrobius fuscipes fuscipes D Hydrobius fuscipes subrotundus.

Figure 13 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 13 - Box- and whisker-plot showing morphometric differences between morphotypes of Hydrobius. 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). a Shape of mesoventral process. Hydrobius arcticus is the only morphotype with a blunt process (indicated by the higher values) b Relative position of trichobothria in relation to the 3rd and 5th row of elytral serial punctures. The trichobothria of Hydrobius fuscipes rottenbergii are positioned closer to the serial punctures than in other morphotypes (indicated by lower values).

Figure 1 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 1 - Measurements of Hydrobius male genitalia. a Paramere in lateral view. A: width of paramere (character 1.5). Curvature of paramere tip (character 1.6) = A+B b Genitalia in dorsal view. 1: Length of sclerotized part of penis. 2: Width of narrowest part of paramere (character 1.2). 3: Length of paramere (character 1.1). Robustness of paramere (character 1.3) = 3 / 2. Paramere length relative penis length (character 1.4) = 3/1. Images of Hydrobius fuscipes rottenbergii.

Figure 4 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 4 - Measurement of Elytral Index (EI). 1 Length of elytra 2 Maximum width of elytra. EI (character 2.4) = 1 / 2. Image of Hydrobius fuscipes fuscipes.

Figure 7 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 7 - Ultrametric (strict clock) maximum clade credibility (MCC) tree used in GMYC analysis of ITS2. Terminal names and abbreviations as in Fig. 5. Values above branches show Bayesian posterior probability support (nodes with PP < 0.4 not shown); values below branches show GMYC-support. Scale bar represents an artificial time scale with the root at time 1.

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.