Chasmogenus

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Chasmogenus
Chasmogenus.jpg
Dorsal view of Chasmogenus lineatus
Scientific classification
Kingdom:
Animalia
Phylum:
Arthropoda
Class:
Insecta
Order:
Coleoptera
Family:
Hydrophilidae
Genus:
Chasmogenus

Sharp, 1882
Type species

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.[1]

Taxonomy[]

The genus Chasmogenus was described for the first time by David Sharp in 1882 for species from Guatemala and Panama.[2]

Since 1919 the genus Crephelochares (from the Old World) was considered a synonym of Chasmogenus,[3] but thanks to the results of a phylogenetic analysis involving molecular data,[4] both taxa are now considered distinct genera on their own right.[1]

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.[1]

Habitat[]

According to Girón and Short:[1]

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 [Chasmogenus cremobates (Spangler)] has been collected in seepages.

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

Species[]

  1. Smith and Short, 2020 [5]
  2. Smith and Short, 2020 [5]
  3. García, 2000 [6]
  4. García, 2000 [6]
  5. Short, 2005 [7]
  6. Smith and Short, 2020 [5]
  7. Smith and Short, 2020 [5]
  8. Alves, Clarkson and Lima, 2020 [8]
  9. Smith and Short, 2020 [5]
  10. Smith and Short, 2020 [5]
  11. Glynn and Short, 2021 [9]
  12. (Spangler, 1979) [10]
  13. Smith and Short, 2020 [5]
  14. Smith and Short, 2020 [5]
  15. Clarkson and Ferreira-Jr, 2014 [8]
  16. Sharp, 1882 [2]
  17. Smith and Short, 2020 [5]
  18. Glynn and Short, 2021 [9]
  19. Smith and Short, 2020 [5]
  20. Smith and Short, 2020 [5]
  21. Glynn and Short, 2021 [9]
  22. Clarkson and Ferreira-Jr, 2014 [8]
  23. Smith and Short, 2020 [5]
  24. Clarkson and Ferreira-Jr, 2014 [8]
  25. Smith and Short, 2020 [5]
  26. Short, 2005 [7]
  27. Smith and Short, 2020 [5]
  28. (Knisch, 1924) [11]
  29. Short, 2005 [7]
  30. Fernández, 1986 [12]
  31. Smith and Short, 2020 [5]
  32. Short, 2005 [7]
  33. Smith and Short, 2020 [5]
  34. Smith and Short, 2020 [5]
  35. Clarkson and Ferreira-Jr, 2014 [8]
  36. Smith and Short, 2020 [5]

References[]

  1. ^ a b c d 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. ^ a b Sharp, D. (1882). Fam. Hydrophilidae. In: Biologia Centrali-Americana Insecta. Coleoptera. Volume 1. Part 2. 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.
  5. ^ a b c d e f g h i j k l m n o p q r 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. ^ a b 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. ^ a b c d 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. ^ a b c d e 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. ^ a b c 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.
  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.


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