Chasmogenus | |
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Dorsal view of Chasmogenus lineatus | |
Scientific classification | |
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Genus: | Chasmogenus Sharp, 1882 |
Type species | |
Chasmogenus fragilis Sharp, 1882 | |
Diversity | |
36 species described to 2021 | |
Synonyms | |
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Chasmogenus is a Neotropical genus of water scavenger beetles belonging to the family Hydrophilidae. [1]
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.
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]
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
Hydrochus is a genus of water scavenger beetles in the monogeneric family Hydrochidae, sometimes placed in the Hydrophilidae as a subfamily Hydrochinae. The family Hydrochidae includes about 180 species, all of which are placed in the genus Hydrochus. Hydrochus has also been used for a fly genus in the family Dolichopodidae. This junior homonym is a junior subjective synonym of the genus Rhaphium.
Tropisternus is a genus of hydrophilid beetles with 63 species in five subgenera in North and South America.
Helochares is a genus of water scavenger beetles in the family Hydrophilidae, represented by 161 described species. It is distributed across the Afrotropical, Australasian, Indo-Malayan, Nearctic, and Palearctic realms.
Helobata is a mostly Neotropical genus of water scavenger beetle in the family Hydrophilidae. It contains 13 described species, one of which is broadly distributed, reaching North America.
Acidocerinae is a subfamily in the family Hydrophilidae of aquatic beetles, and it contains over 500 species in 23 genera.
Acidocerus is a genus of water scavenger beetle in the family Hydrophilidae represented by only one species. It is known only from Mozambique.
Crephelochares abnormalis, is a species of water scavenger beetle found in Cambodia, Sri Lanka, Taiwan, Thailand, Vietnam, Ryukyu Islands and Indonesia: Borneo, Java, Sulawesi, Sumatra.
Agraphydrus is a genus of water scavenger beetle in the family Hydrophilidae represented by 205 described species. It is distributed across the Afrotropical, Australasian, and Indomalayan realms.
Aulonochares is a Neotropical genus of water scavenger beetle in the family Hydrophilidae represented by three described species known from the Guiana Shield Region.
Colossochares is an Afrotropical genus of water scavenger beetle in the family Hydrophilidae represented by two described species.
Crephelochares is a genus of water scavenger beetle in the family Hydrophilidae represented by 29 described species. It is distributed across the Afrotropical, Australasian, Indo-Malayan, and Palaearctic realms.
Ephydrolithus is a Neotropical genus of water scavenger beetle in the family Hydrophilidae represented by five described species known from Brazil.
Globulosis is a Neotropical genus of water scavenger beetle in the family Hydrophilidae represented by two described species known from the Guiana Shield Region.
Katasophistes is a Neotropical genus of water scavenger beetle in the family Hydrophilidae represented by four described species known from the Guiana Shield Region.
Nanosaphes is a Neotropical genus of water scavenger beetle in the family Hydrophilidae represented by seven described species known from the Guiana Shield Region.
Novochares is a primarily Neotropical genus of water scavenger beetles in the family Hydrophilidae represented by 15 described species, one of which is tought to be introduced in Florida in the United States of America.
Peltochares is a genus of water scavenger beetles in the family Hydrophilidae represented by eight described species. It is distributed across the Afrotropical, Australasian, Indo-Malayan, and Palaearctic realms.
Primocerus is a Neotropical genus of water scavenger beetle in the family Hydrophilidae represented by nine described species known from the Guiana Shield Region.
Quadriops is a Neotropical genus of water scavenger beetle in the family Hydrophilidae represented by six described species.
Radicitus is a Neotropical genus of water scavenger beetle in the family Hydrophilidae represented by three described species known from the Guiana Shield Region.