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Chasmogenus

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Genus of beetles

Chasmogenus
Dorsal view of Chasmogenus lineatus
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Coleoptera
Suborder: Polyphaga
Infraorder: Staphyliniformia
Family: Hydrophilidae
Subfamily: Acidocerinae
Genus: Chasmogenus
Sharp, 1882
Type species
Chasmogenus fragilis
Sharp, 1882
Diversity
36 species described to 2021
Synonyms
  • Dieroxenus Spangler, 1979

Chasmogenus is a Neotropical genus of water scavenger beetles 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 (from the Old World) 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 (2.5–5.0 mm), 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:

The vast majority of Chasmogenus are known from forested habitats, including the margins of streams and forest pools. A few species are known from open marsh habitats (e.g., Chasmogenus australis García and Chasmogenus sapucay Fernández). They can be found among the vegetation and submerged leaf litter. They are also attracted to lights, though usually not in large numbers. Only one species has been collected in seepages.

— Girón and Short, The Acidocerinae (Coleoptera, Hydrophilidae): taxonomy, classification, and catalog of species

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 (Spangler, 1979)
  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 (Knisch, 1924)
  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

References

  1. ^ Girón, JC; Short, AEZ (18 June 2021). "The Acidocerinae (Coleoptera, Hydrophilidae): taxonomy, classification, and catalog of species". ZooKeys (1045): 1–236. doi:10.3897/zookeys.1045.63810. PMC 8233300. PMID 34228772.
  2. ^ Sharp, D. (1882). Fam. Hydrophilidae. In: Biologia Centrali-Americana Insecta. Coleoptera. Volume 1. Part 2. Vol. 1. pp. 53–80.
  3. d’Orchymont, A. (1919). "Contribution à l'étude des sous-familles des Sphaeridiinae et des Hydrophilinae (Col. Hydrophilidae)". Annales de la Société entomologique de France. 88 (1–2): 105–168.
  4. Short, Andrew Edward Z.; Girón, Jennifer C.; Toussaint, Emmanuel F. A. (2021). "Evolution and biogeography of acidocerine water scavenger beetles (Coleoptera: Hydrophilidae) shaped by Gondwanan vicariance and Cenozoic isolation of South America". Systematic Entomology. 46 (2): 380–395. doi:10.1111/syen.12467. ISSN 1365-3113. S2CID 232264478.
  5. ^ Smith, Rachel R.; Short, Andrew Edward Z. (2020-05-19). "Review of the genus Chasmogenus Sharp, 1882 of northeastern South America with an emphasis on Venezuela, Suriname, and Guyana (Coleoptera, Hydrophilidae, Acidocerinae)". ZooKeys (934): 25–79. doi:10.3897/zookeys.934.49359. ISSN 1313-2970. PMC 7250940. PMID 32508494.
  6. ^ García, M. (2000). "Four new species of Chasmogenus Sharp, 1882 (Coleoptera: Hydrophilidae: Hydrophilinae) from Venezuela". Boletín del Centro de Investigaciones Biológicas Universidad del Zulia. 34: 45–58.
  7. ^ Short, A. E. Z. (2005). "A review of the subtribe Acidocerina of Central America with special reference to Costa Rica (Coleoptera: Hydrophilidae)" (PDF). Koleopterologische Rundschau. 75: 191–226.
  8. ^ Clarkson, B; Ferreira Jr, N (2014). "Four new species and first nominal record of Chasmogenus Sharp, 1882 (Coleoptera: Hydrophilidae) from Brazil" (PDF). Zootaxa. 3765 (5): 481–494. doi:10.11646/zootaxa.3765.5.6. PMID 24870916. S2CID 46379711. Archived from the original on 2019-03-07.
  9. ^ Glynn, Rachel D.; Short, Andrew Edward Z. (2021-10-07). "New species and records of Chasmogenus Sharp, 1882 from the southwestern margin of the Guiana Shield (Coleoptera: Hydrophilidae: Acidocerinae)". Zootaxa. 5048 (3): 435–443. doi:10.11646/zootaxa.5048.3.8. ISSN 1175-5334. PMID 34810791. S2CID 242935735.
  10. Spangler, P. J. (1979). "A new genus of madicolous beetles from Ecuador (Coleoptera: Hydrophilidae: Hydrobiinae)". Proceedings of the Biological Society of Washington. 92: 753–761.
  11. Knisch, A. (1924). "Neue neotropische Palpicornier. (Col. Hydrophilidae. - Op. 16.)". Wiener Entomologische Zeitung. 41: 114–140.
  12. Fernández, L. A. (1986). "Consideraciones sobre el género Chasmogenus Sharp y descripción de Chasmogenus sapucay sp. nov. (Coleoptera: Hydrophilidae)". Neotrópica. 32: 189–193.
Taxon identifiers
Chasmogenus


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