Revision of the Neotropical water scavenger beetle genus Girón & Short (Coleoptera, Hydrophilidae, Acidocerinae).

The water scavenger beetle genus Girón & Short, 2021 is revised using a combination of adult morphological and DNA sequence data. Thirty-eight new species are described: (Bolivia), (Brazil, Ecuador, Peru, Suriname), (Brazil), (Brazil), (Brazil, French Guiana, Peru), (Venezuela), (Ecuador, Venezuela), (Peru), (Brazil, French Guiana, Guyana, Suriname, Venezuela), (Brazil, Peru, Venezuela), (Brazil), (Brazil), (Venezuela), (Brazil), (Brazil), (Ecuador, Peru), (Brazil), (Peru, Suriname, Venezuela), (Bolivia), (Brazil), (Brazil, French Guiana, Suriname), (Ecuador), (Brazil), (Venezuela), (Venezuela), (Venezuela), (Brazil, French Guiana, Guyana, Peru, Suriname), (Brazil, Guyana, Suriname), (Peru), (Peru), (Guyana, Venezuela), (Bolivia, Brazil, Paraguay), (Brazil), (Peru), (Bolivia, Peru), (Brazil), and (Venezuela), (Peru). One new synonym is proposed: (Short, 2005) was determined to be a junior subjective synonym of (Fernández, 1982).

New species and new distributional records of the hygropetric water scavenger beetle genus Oocyclus Sharp (Coleoptera: Hydrophilidae) from the Guiana Shield.

The species of the water scavenger beetle genus Oocyclus Sharp are reviewed for the Guiana Shield region of South America. Seven species are recorded, including one here described as new: Oocyclus paraiso sp. n.

Revision of the water scavenger beetle genus Spangler, 1972 in the Neotropical Region (Coleoptera, Hydrophilidae, Enochrinae).

The Neotropical species of the water scavenger beetle genus Spangler, 1972 are revised using an integrative taxonomic approach combining morphology with DNA sequence data from two genes. Support exists for four putative species groups into which 18 species are placed, including twelve that are described here as new: (Suriname), (Venezuela), (Brazil), (Brazil), (Brazil), (Venezuela), (Brazil), (Suriname), (Guyana), (Peru), (Guyana), and (Brazil). Four new synonymies are created: Queney is found to be conspecific with Queney; García , Perkins , and García are found to be conspecific with Perkins.

New species and new distributional records of the hygropetric water scavenger beetle genus Oocyclus Sharp (Coleoptera, Hydrophilidae) from the Brazilian Shield.

Nine new species of the water scavenger beetle genus Oocyclus Sharp, 1882 are described from the Brazilian Shield: O. ecolab sp. n.

New species and records of Chasmogenus Sharp, 1882 from the southwestern margin of the Guiana Shield (Coleoptera: Hydrophilidae: Acidocerinae).

The Neotropical water scavenger beetle genus Chasmogenus Sharp, 1882 is a diverse lineage with 34 described species. Here, three new species from the southwestern margin of the Guiana Shield are described using an integrative approach combining adult morphology and molecular data: Chasmogenus clinatus sp. n.

The Acidocerinae (Coleoptera, Hydrophilidae): taxonomy, classification, and catalog of species.

The cosmopolitan subfamily Acidocerinae (Coleoptera: Hydrophilidae) is one of the largest and most taxonomically challenging lineages of water scavenger beetles. Recent phylogenetic studies have substantially advanced our understanding of acidocerine relationships but also illuminated the twin challenges of poorly delineated generic concepts and a classification broadly incompatible with the phylogeny. Here, these two challenges are addressed by providing a comprehensive synthesis and taxonomic tools for the Acidocerinae, including (1) a brief history and the current state of acidocerine classification, (2) a review of acidocerine ecology and collection methods, (3) the current knowledge of larval and fossil acidocerines, (4) a morphological primer on characters of taxonomic and systematic importance within the lineage, (5) a key to the world genera of Acidocerinae, (6) diagnoses, habitus, and aedeagal images, distribution maps, and summary of knowledge for each of the 23 extant genera in the subfamily, and (7) a complete annotated taxonomic catalog including the published distributions, synonyms, and references for all described 541 acidocerine species recognized as of 1 April 2021.

Review of the New World Sharp (Coleoptera, Noteridae) I: Circumscription of species groups and review of the group with description of a new species from Brazil.

The New World species of the minute aquatic beetle genus Sharp compose a much greater diversity than their Old World congeners, with 14 of the 17 known species occurring in the Neotropics. A recent phylogenetic study recovered four primary New World species groups and found that there are a number of undescribed species across all of these main lineages. Here, we provide a taxonomic key to these New World species groups, including two described species that we currently do not place in any group ("" species), complete with images and illustrations of diagnostic characters and taxonomic notes including a list of known species in each group.

Review of the Neotropical water scavenger beetle genus Short & García, 2007 (Coleoptera, Hydrophilidae, Acidocerinae): new lineages, new species, and new records.

The water scavenger beetle genus Short & García, 2007 currently contains ten species, including one known but formally undescribed taxon. Although was revised in 2017, ongoing fieldwork as well as an expanded concept of the genus has led to the recognition of numerous additional species. Here a combination of morphological and molecular data is presented to review this newly found diversity.

Rediscovery of the Neotropical water scavenger beetle Protistolophus spangleri Short with notes on its habitat and behavior (Coleoptera: Hydrophilidae: Hydrophilinae).

The water scavenger beetle genus Protistolophus Short contains a single species, P. spangleri Short, 2010, known from southern Venezuela. The genus was hitherto known only from a single partly-incomplete male specimen, making it one of the rarest and most poorly known aquatic hydrophilid genera in the world.

Hydaticus aequalis sp. n. and a new record of H. devexus Trémouilles, 1996 from Brazil (Coleoptera, Dytiscidae, Hydaticini).

Hydaticus aequalis sp. n. is described from Brazil, where it was recently discovered in the central lowlands region of the Amazon forest.

Review of the genus Sharp, 1882 of northeastern South America with an emphasis on Venezuela, Suriname, and Guyana (Coleoptera, Hydrophilidae, Acidocerinae).

The water scavenger beetle genus Sharp, 1882 is reviewed in northeastern South America using an integrative approach that combines adult morphology and molecular data from the gene cytochrome c oxidase I (COI). Eighteen new species are described: (Brazil, French Guiana, Guyana, Suriname), (Venezuela), (Guyana), (Suriname), (Venezuela), (Venezuela), (Venezuela), (Venezuela), (Venezuela), (Suriname, Guyana), (Brazil), (Suriname), (Venezuela), (Brazil, French Guiana, Suriname), (Suriname), (French Guiana), (Suriname), and (Guyana). We found genetic support for an additional new species in Guyana which is currently only known from females that we refer to as sp.

Three additional new genera of acidocerine water scavenger beetles from the Guiana and Brazilian Shield regions of South America (Coleoptera, Hydrophilidae, Acidocerinae).

Recent study of the water scavenger beetle subfamily Acidocerinae in the Neotropical region has uncovered numerous undescribed species that are not able to be placed in existing genera. Here, we describe three new genera to accommodate 17 of these new species from South America: for (French Guiana, Suriname), (Brazil), and (Brazil, Guyana, Suriname, Venezuela); for (Brazil), (Brazil), (Brazil), (Brazil), and (Brazil); and for (Venezuela), (Venezuela), (Guyana, Suriname, Venezuela), (Venezuela), (Brazil), (Venezuela), (Venezuela), (Guyana), and (Suriname). The genus is currently known to be restricted to seepages in the mountainous regions of the Brazilian Shield.

Water Beetles as Models in Ecology and Evolution.

Beetles have colonized water many times during their history, with some of these events involving extensive evolutionary radiations and multiple transitions between land and water. With over 13,000 described species, they are one of the most diverse macroinvertebrate groups in most nonmarine aquatic habitats and occur on all continents except Antarctica. A combination of wide geographical and ecological range and relatively accessible taxonomy makes these insects an excellent model system for addressing a variety of questions in ecology and evolution.

Three new genera of acidocerine water scavenger beetles from tropical South America (Coleoptera, Hydrophilidae, Acidocerinae).

Recent collecting efforts in the Neotropics have led to the discovery of numerous new species and lineages of aquatic beetles. Here, three new genera are described to accommodate fifteen new species of water scavenger beetles of the subfamily Acidocerinae from northern South America: for (Venezuela), (Guyana, French Guiana, Suriname, Venezuela), (French Guiana), (Brazil), (Venezuela), (Suriname), and (Brazil); . for (Peru), (Peru), (Venezuela) and (Ecuador); and for (Brazil), (Suriname), (Guyana), and (Guyana, Suriname).

Notomicrus petrareptans sp. n., a new seep-dwelling species of Noteridae from Suriname (Coleoptera: Adephaga).

Notomicrus petrareptans sp. n. is described from an inselberg seepage in southwestern Suriname.

Review of the Helochares (Hydrobaticus) MacLeay of the New World (Coleoptera: Hydrophilidae: Acidocerinae).

New World species assigned to the Helochares subgenus Hydrobaticus MacLeay are reviewed based on adult morphology and DNA sequence data. Nine species are recognized, including five here described as new: Helochares (Hydrobaticus) laevis n. sp.

Revision of the Neotropical water scavenger beetle genus Hansen, 1999 (Coleoptera, Hydrophilidae, Acidocerinae).

The genus Hansen, 1999 is revised and redescribed. The genus is found to contain six species, including two that are here described as new: (Brazil, Guyana, Suriname) and (Suriname, French Guiana). Two species are found to be junior subjective synonyms of Hansen, 1999: García, 2000, and Hansen, 1999, The male of Hansen, 1999 is described for the first time.

Entomological Collections in the Age of Big Data.

With a million described species and more than half a billion preserved specimens, the large scale of insect collections is unequaled by those of any other group. Advances in genomics, collection digitization, and imaging have begun to more fully harness the power that such large data stores can provide. These new approaches and technologies have transformed how entomological collections are managed and utilized.

Revision of the Neotropical water scavenger beetle genus Short & García, 2007 (Coleoptera, Hydrophilidae, Acidocerinae).

The genus Short & García, 2007 is revised. A combination of morphological and molecular data provide support for ten distinct species. Five new species are described: (Venezuela), (Venezuela), (Suriname), (Guyana), and (Venezuela).

Revision of the Neotropical water scavenger beetle genus García, 2001 (Coleoptera: Hydrophilidae: Acidocerinae).

The Neotropical water scavenger beetle genus Globulosis García, 2001 is revised. Originally described from a single male specimen from southeastern Venezuela, the genus has since been found in localities across the Guiana Shield region and beyond, including Colombia, Suriname, Guyana, and Brazil. The genus is redescribed.

Hexanchorus bifurcatus sp. nov., a new tepui riffle beetle (Coleoptera: Elmidae: Larainae) from Tafelberg, Suriname.

Here we present the first published record of a laraine elmid from Suriname, which represents a new species - Hexanchorus bifurcatus sp. nov. Specimens were collected from the summit of Tafelberg, a table mountain near the Wilhelmina Range of Suriname.

Review of the Lutrochidae (Coleoptera) of the Guianas and Lesser Antilles, with description of four new species.

The species of Lutrochidae from the Guianas, and the Lesser Antilles are reviewed, including the first reports of the family from Guyana, Suriname, and Grenada. Four species are described as new: Lutrochus funkae n. sp.

A new genus of egg case-carrying water scavenger beetle from the Guiana Shield (Coleoptera: Hydrophilidae: Acidocerinae).

Radicitus gen. n. is described to accommodate three new species of water scavenger beetles from the Guiana Shield region of South America: R.

New species and new records of the hygropetric water beetle genus Oocyclus Sharp from South America (Coleoptera: Hydrophilidae).

Three new species of Oocyclus Sharp, 1882 are described from tropical South America: O. maluz sp. n.