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

• Main Authors: Fossen, Erlend, Ekrem, Torbjørn, Nilsson, Anders, Bergsten, Johannes
• Format: Other/Unknown Material
• Language: unknown
• Published: 2016
• Subjects: Animalia; Arthropoda; Insecta; Coleoptera; Hydrophiloidea; Hydrophilidae; Hydrobius; Hydrobius fuscipes; GMYC; species complex; BPP; guide tree; Fennoscandia; morphometrics; Bayesian; genitalia; molecular phylogeny; species boundaries; morphology; cryptic species; integrative taxonomy; DNA barcoding; identification key; taxonomy; checklist; Fossen
• Online Access: https://zenodo.org/record/973430; https://doi.org/10.3897/zookeys.564.6558.figure4

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.