Blethisa

Blethisa species can be distinguished from other Carabidae by their association with the subfamily Elaphrinae, which contains hygrophilous ground beetles. Specific diagnostic morphological features for the genus are not documented in available sources.

Aquatic or semi-aquatic environments, including shorelines and areas subject to flooding. Species have been observed in association with water bodies where diving behavior is possible.

Holarctic distribution, encompassing the Palearctic and Nearctic regions. Documented occurrences include Denmark, Norway, Sweden, and the United States (including Vermont).

Blethisa multipunctata has been observed to dive spontaneously and remain submerged for extended periods (up to 97 minutes recorded). This species uses its air storage as a physical gill rather than relying on morphological or physiological adaptations for underwater respiration. Submerged individuals periodically emerge briefly before descending again, and approximately 50% of submerged beetles do not leave the water after two hours in experimental conditions.

• Other Elaphrinae generaShare hygrophilous habits and aquatic associations; Blethisa is distinguished by its specific diving behavior documented in B. multipunctata and its Holarctic distribution pattern.

• Carabidae
• Elaphrinae
• ground beetle
• Holarctic
• aquatic
• diving beetle
• hygrophilous

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Diving behaviour and respiration in Blethisa multipunctata in comparison with two other ground beetles