Chasmogenus


Chasmogenus is a Neotropical genus of water [scavenger beetle]s belonging to the family Hydrophilidae.

Taxonomy

The genus Chasmogenus was described for the first time by David Sharp in 1882 for species from Guatemala and Panama.
Since 1919 the genus Crephelochares was considered a synonym of Chasmogenus, but thanks to the results of a phylogenetic analysis involving molecular data, both taxa are now considered distinct genera on their own right.
Currently, a total of 36 species is identified and documented, most of them recorded from the Guiana Shield Region.

Description

Small size, bearing a clearly visible sutural stria; long maxillary palps; metafemora usually densely covered by hydrofuge pubescence. The external morphology in Chasmogenus is very uniform across species, so that most species can only be identified by the shape of the male genitalia.
By the presence of the sutural stria, in the Neotropical region, Chasmogenus can only be confused with some members of the genus Primocerus.

Habitat

According to Girón and Short:

Species

  1. Chasmogenus acuminatus Smith and Short, 2020
  2. Chasmogenus amplius Smith and Short, 2020
  3. Chasmogenus australis García, 2000
  4. Chasmogenus bariorum García, 2000
  5. Chasmogenus barrae Short, 2005
  6. Chasmogenus berbicensis Smith and Short, 2020
  7. Chasmogenus brownsbergensis Smith and Short, 2020
  8. Chasmogenus cajuina Alves, Clarkson and Lima, 2020
  9. Chasmogenus castaneus Smith and Short, 2020
  10. Chasmogenus clavijoi Smith and Short, 2020
  11. Chasmogenus clinatus Glynn and Short, 2021
  12. Chasmogenus cremnobates
  13. Chasmogenus cuspifer Smith and Short, 2020
  14. Chasmogenus flavomarginatus Smith and Short, 2020
  15. Chasmogenus fluminensis Clarkson and Ferreira-Jr, 2014
  16. Chasmogenus fragilis Sharp, 1882
  17. Chasmogenus gato Smith and Short, 2020
  18. Chasmogenus gironae Glynn and Short, 2021
  19. Chasmogenus guianensis Smith and Short, 2020
  20. Chasmogenus ignotus Smith and Short, 2020
  21. Chasmogenus inpa Glynn and Short, 2021
  22. Chasmogenus itatiaia Clarkson and Ferreira-Jr, 2014
  23. Chasmogenus ligulatus Smith and Short, 2020
  24. Chasmogenus lilianae Clarkson and Ferreira-Jr, 2014
  25. Chasmogenus lineatus Smith and Short, 2020
  26. Chasmogenus lorenzo Short, 2005
  27. Chasmogenus pandus Smith and Short, 2020
  28. Chasmogenus rufinasus
  29. Chasmogenus ruidus Short, 2005
  30. Chasmogenus sapucay Fernández, 1986
  31. Chasmogenus schmits Smith and Short, 2020
  32. Chasmogenus schoedli Short, 2005
  33. Chasmogenus sinnamarensis Smith and Short, 2020
  34. Chasmogenus tafelbergensis Smith and Short, 2020
  35. Chasmogenus ubatuba Clarkson and Ferreira-Jr, 2014
  36. Chasmogenus undulatus Smith and Short, 2020